kernelcad

endpoint

https://mcp.kernelcad.com/mcp

protocol

http-sse ·2025-06-18

authentication

none observed

public key

none — nobody has proven they own this listing

karma

0 · newcomer

Price is per tool, not per server. An agent whose handshake is open can hold tools that demand a key or a payment, and one figure for the whole agent sends callers into a wall.

• diff_geometry open 7h ago

  Use this when you need to know WHAT MATERIAL changed between two versions of a model, not just how much. The deeper sibling of diff_scripts: a volume delta alone is ambiguous (a boss that grew and a pocket that deepened report the same magnitude, and a part that only moved reports zero), so this tool answers it with geometry instead of pixels. Baseline is { baseFile } or { baseCode }; the revised side is either another script ({ file } or { code }) or the SAME script re-lowered with { params } overrides — a bag of declared param() name -> new value, which is the one-script form a parameter sweep actually asks for. Bodies pair by name and fall back to declaration-order positional pairing; anything left over is listed in `unmatched` and raises diff.body.unmatched. Per matched body it returns addedMm3 = volume(revised - base), removedMm3 = volume(base - revised), commonMm3 = volume(base ∩ revised) from OCCT booleans, exact bbox with min/max/extent deltas, face / edge / hole count deltas (hole counts reuse the cylindrical-hole detector), maxDeviationMm (two-sided discrete Hausdorff distance between the two surfaces), and a `verdict` — identical | moved | resized | topology-changed, precedence topology-changed > resized > moved > identical. Branch on the verdict; cite the numbers. Optional { render: true } also writes an overlay PNG (added green, removed red, unchanged material as a translucent ghost; the scene is a re-runnable .kcad.ts over lossless BREP sidecars) through the render_preview pipeline and fails open (the numeric diff is still returned) when that pipeline is unavailable. Read-only — never touches the active session.

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  {
    "type": "object",
    "properties": {
      "code": {
        "type": "string",
        "description": "Revised script — inline source. Mutually exclusive with params."
      },
      "file": {
        "type": "string",
        "description": "Revised script — path to a .kcad.ts file. Mutually exclusive with params."
      },
      "params": {
        "type": "object",
        "description": "Param-override mode: re-lower the BASELINE with these declared param() values changed (e.g. { plateThickness: 8 }). Mutually exclusive with file/code. A name the baseline does not declare fails with the declared-param list in the message.",
        "additionalProperties": true
      },
      "render": {
        "type": "boolean",
        "description": "Also render an overlay PNG — added material green, removed material red — via the render_preview pipeline. Off by default; the numeric table is the agent-facing evidence."
      },
      "out_dir": {
        "type": "string",
        "description": "Directory for the overlay PNG, its STL inputs, and the generated overlay script. Default: a temp dir."
      },
      "baseCode": {
        "type": "string",
        "description": "Baseline script — inline source."
      },
      "baseFile": {
        "type": "string",
        "description": "Baseline script — path to a .kcad.ts file."
      }
    }
  }

  arguments 34 lines copy
• diff_scripts open 7h ago

  Use this when you need to see exactly what changed between two script versions. Structured geometric delta between two versions of a kernelCAD script — a baseline ({ baseFile } or { baseCode }) and a revision ({ file } or { code }). Returns agent-readable JSON: per-part added/removed/renamed/changed (volume mm³ + exact bbox deltas, numbers matching inspect({ of: 'part-stats' })), total interference-volume delta with per-pair detail, mate-graph changes (added/removed/changed mates incl. type, connectors, pose, limits), and param changes (value/min/max). Single-shape scripts diff as one "(root)" pseudo-part. Use after editing a script to verify exactly what changed physically before re-rendering. Read-only — never touches the active session.

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  {
    "type": "object",
    "properties": {
      "code": {
        "type": "string",
        "description": "Revised script — inline source."
      },
      "file": {
        "type": "string",
        "description": "Revised script — path to a .kcad.ts file."
      },
      "baseCode": {
        "type": "string",
        "description": "Baseline script — inline source."
      },
      "baseFile": {
        "type": "string",
        "description": "Baseline script — path to a .kcad.ts file."
      }
    }
  }

  arguments 21 lines copy
• evaluate_script open 7h ago

  Use this when you need to run a script and check it compiles. Run a kernelCAD .kcad.ts script and report pass/fail + feature count + diagnostics. When the scene is assembly-built (assembly().part(...) → .model()/.solvedModel()), also returns a parts summary { count, names } AND runs the mechanism-truth gate by default: the `mechanism` field reports real/broken/unverified and a broken mechanism (disconnected components / mechanism.orphan-part, self-collision, fastened drift, dof-mismatch) makes ok:false with the failures in diagnostics — multi-body assemblies need connectors + mates/joints (axis+revolute for shafts/hinges/gears; frame+fastened for rigid; or arm.revolute/.prismatic/.ball/.fixed). Pass { skipMechanismCheck: true } to opt out. Pass either { file: "<path>" } or { code: "<inline source>" }. Set { dryRun: true } for fast validation while iterating: transpile + capture + capture-light checks WITHOUT OCCT lowering, DFM gates, or meshing — milliseconds instead of seconds (100x+ on boolean/fillet-heavy scripts). A dry run catches script throws, capture-time API misuse, and assembly validity-gate failures, but NOT lowering failures or dfmSpec diagnostics; it leaves the active session untouched, so finish with a full (non-dry) evaluate_script before using session-dependent tools.

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  {
    "type": "object",
    "properties": {
      "code": {
        "type": "string",
        "description": "Inline kernelCAD script source."
      },
      "file": {
        "type": "string",
        "description": "Path to a .kcad.ts script file."
      },
      "dryRun": {
        "type": "boolean",
        "description": "Fast validation only: skip OCCT lowering, DFM gates, and meshing. Does not set or clear the active session."
      },
      "skipMechanismCheck": {
        "type": "boolean",
        "description": "Opt out of the default mechanism-truth gate. By default a full evaluation of an assembly-built scene runs checkMechanismTruth and returns a `mechanism` verdict (real/broken/unverified); a broken mechanism makes ok:false. Set true to skip the sweep entirely (no `mechanism` field, no cost). Ignored for dryRun and non-assembly scripts."
      }
    }
  }

  arguments 21 lines copy
• get_model_mesh unknown never probed

  Return the raw per-feature triangle mesh (positions/indices/normals) of a project's current model, by slug. For the in-chat 3D viewer widget to render geometry; delivered over the MCP Apps bridge. The slug is the capability: public/unlisted need no OAuth; private requires the owner signed in.

  mcp-tool

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  {
    "type": "object",
    "required": [
      "slug"
    ],
    "properties": {
      "slug": {
        "type": "string",
        "minLength": 1,
        "description": "Project slug from open_in_studio/get_project."
      }
    },
    "additionalProperties": false
  }

  arguments 14 lines copy
• lookup_authoring_skill unknown never probed

  Return the kernelcad-authoring SKILL.md body — conventions for writing .kcad.ts scripts (imports, parameters, evaluation contract, common pitfalls). Use this tool BEFORE generating CAD code if your MCP client does not list resources. Clients that do list resources should instead read `kernelcad://skills/authoring` directly — the contents are identical. INPUT: none. OUTPUT: { uri, mimeType, text } where `text` is the SKILL.md body.

  mcp-tool

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  {
    "type": "object",
    "properties": {}
  }

  arguments 4 lines copy
• drawing_to_cad unknown never probed

  Use this when the reference for a part is a 2D engineering drawing PDF (orthographic views with dimensions), not a photo. Deterministic, no vision model: reads the vector linework (stroke width, dash) and positioned text; classifies visible / hidden / center / dimension / extension lines; reads the title block scale, units and projection symbol; identifies front / top / side views by projection alignment (third- or first-angle); ties dimension text to its lines (⌀, R, 4×, ±, THRU, depth). Dimension values win over measured lengths. Rebuilds the part as the view silhouette extruded by the depth an orthogonal view shows, or a turned part revolved from its half-silhouette, plus holes from ⌀ circles with THRU or hidden-line depth. Returns `script` — a `.kcad.ts` with role-named params (width, thickness, holeDia, hole1X, dia1, step1Length …) — and `ledger`, an assumption ledger where stated dimensions are `visible`, symmetry-derived positions `inferred`, defaults `assumed` and an unstated depth `missing`; a dimension that disagrees with the linework keeps its value and records the disagreement as an open fact. With verify (default) the script is evaluated, re-projected through the svg-drawing view stage and compared: `fidelity.verdict` is match | partial | mismatch | failed with per-axis extents, hole diameters and per-view silhouette IoU. Pass `out` to write the script and its `<stem>.ledger.json` (resolve open facts with resolve_assumptions, then set_param). A scanned (raster-only) page fails with reference.drawing.raster-only — use trace_from_image for those.

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  {
    "type": "object",
    "properties": {
      "out": {
        "type": "string",
        "description": "Write the emitted script here (a .kcad.ts path); the ledger is written beside it as <stem>.ledger.json."
      },
      "page": {
        "type": "integer",
        "minimum": 1,
        "description": "1-based page to read. Default 1."
      },
      "path": {
        "type": "string",
        "description": "Path to the drawing PDF on the machine running kernelCAD."
      },
      "verify": {
        "type": "boolean",
        "description": "Evaluate the rebuilt part and compare it with the drawing. Default true."
      },
      "pdfBase64": {
        "type": "string",
        "description": "The PDF inline, base64-encoded. Use this instead of `path` against a hosted kernelCAD server."
      },
      "projection": {
        "enum": [
          "third-angle",
          "first-angle"
        ],
        "type": "string",
        "description": "Override the projection angle read from the sheet (default: projection symbol or note, else third-angle)."
      }
    }
  }

  arguments 34 lines copy
• capture_animation unknown never probed

  Use this when you need to render a script's animation timeline to a video. Capture a kernelCAD script's animationView({...}) timeline to an MP4 (ffmpeg) or a PNG frame sequence, verifying the sampled poses for part interference. FILE ONLY: pass { file } (a .kcad.ts path) — there is no { code } mode, because the capture engine renders from a file on disk (its relative lib.fromSTEP imports resolve against the script directory). MP4 by default; pass { frames_dir } to write frame-0000.png... and skip ffmpeg entirely (mutually exclusive with output_path). Animation-pose interference verification runs by default (keyframe times + segment midpoints) BEFORE any browser/ffmpeg cost; { no_verify: true } skips it and { verify_every: n } additionally samples every n-th frame time. Pass { focus } or { hide } (arrays of feature ids or assembly part names, mutually exclusive) to isolate parts in the rendered frames — same semantics as `kernelcad render --focus/--hide`; visibility is render-only and does NOT affect the pose verification. Collisions DO NOT fail the call — the artifact is still written as evidence with ok: true; read verified: false + the collisions[] array. ENVIRONMENT REQUIREMENT (identical to `kernelcad render`): capture drives a headless browser against a running studio dev server reachable at http://localhost:5173 (or the VITE_PORT override); there is no bundled-static serving mode yet, so the same dev-server precondition applies in a production MCP install. Returns { ok, output_path, frame_count, duration_ms, fps, verified, verify_skipped?, collisions: [{ t_ms, a, b, volume_mm3 }], diagnostics }.

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  {
    "type": "object",
    "required": [
      "file"
    ],
    "properties": {
      "fps": {
        "type": "number",
        "description": "Override the animationView record's fps."
      },
      "file": {
        "type": "string",
        "description": "Path to a .kcad.ts script with an animationView({...}) record. Required (no inline { code } mode)."
      },
      "hide": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "Hide matching feature ids / assembly part names in the rendered frames. Mutually exclusive with focus. Render-only; does not affect pose verification."
      },
      "focus": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "Show only matching feature ids / assembly part names in the rendered frames. Mutually exclusive with hide. Render-only; does not affect pose verification."
      },
      "no_verify": {
        "type": "boolean",
        "default": false,
        "description": "Skip the animation-pose interference verification (default: verify on)."
      },
      "frames_dir": {
        "type": "string",
        "description": "PNG-sequence mode directory: write frame-0000.png... and skip ffmpeg. Mutually exclusive with output_path."
      },
      "output_path": {
        "type": "string",
        "description": "MP4 output path; default <scriptDir>/<basename>-animation.mp4. Mutually exclusive with frames_dir."
      },
      "verify_every": {
        "type": "integer",
        "minimum": 1,
        "description": "Additionally verify at every n-th frame time of the fps schedule (unioned with the keyframe sample set)."
      }
    }
  }

  arguments 48 lines copy
• mesh_to_features unknown never probed

  Use this when you are handed an STL, OBJ or 3MF of a mostly prismatic mechanical part (plate, bracket, spacer, flange, housing block) and need an EDITABLE kernelCAD model of it rather than a faceted lib.fromSTL import. Deterministic, measured, self-verifying: it welds and checks the mesh, segments planes and cylinders, picks the extrusion axis, slices each band and fits exact lines / arcs / circles, snaps near-round values (each snap recorded), then emits a readable .kcad.ts with named param()s — a revolve for concentric round stacks, extruded profiles otherwise, .hole()/.holes() for through, blind and counterbored bores (axial and side-drilled), .cutout() for pockets, .fillet() for constant-radius edge blends (radius measured on the sharp edge, edges grouped by radius and picked with the shortest exact edge query), boolean subtractions for what no drilling feature can reach. It then EVALUATES that script and compares it with the mesh: volume IoU (column ray casting) and symmetric surface deviation (max + RMS), over up to 4 refinement passes. Returns { script, ledger, fidelity: { maxDeviationMm, rmsMm, volumeIoU, verdict: faithful | approximate | failed, thresholds }, unmatchedRegions, features, passes }. A fillet or sharp reading is kept by which measures better; variable-radius blends and chamfers are reported, not forced. The verdict is computed from the numbers — faithful needs IoU >= minIoU AND max deviation <= maxDeviationMm AND a watertight mesh AND no unmatched region. Freeform surfaces, tilted planes and side bosses are listed in unmatchedRegions (reference.mesh.freeform-region-unmatched), never silently dropped. The ledger uses fact ids equal to param names, so resolve_assumptions on the written <out>.ledger.json yields paramOverrides for set_param. Pass { out } to write the script and ledger; the mesh itself is never modified.

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  {
    "type": "object",
    "properties": {
      "out": {
        "type": "string",
        "description": "Write the emitted script to this .kcad.ts path and the assumption ledger to the sibling .ledger.json."
      },
      "data": {
        "type": "string",
        "description": "Mesh bytes as base64 — use when the server cannot see your filesystem."
      },
      "file": {
        "type": "string",
        "description": "Path to a .stl (binary or ASCII), .obj or .3mf mesh. One of file / data is required."
      },
      "format": {
        "enum": [
          "stl",
          "obj",
          "3mf"
        ],
        "type": "string",
        "description": "Format override; default from the extension or the content."
      },
      "minIoU": {
        "type": "number",
        "description": "Volume IoU a faithful verdict requires. Default 0.98."
      },
      "maxPasses": {
        "type": "number",
        "description": "Refinement passes, 1–4. Default 4; stops early at the first faithful pass."
      },
      "maxTriangles": {
        "type": "number",
        "description": "Refuse meshes above this triangle count instead of stalling. Default 300000."
      },
      "maxDeviationMm": {
        "type": "number",
        "description": "Max surface deviation (mm) a faithful verdict allows. Default max(0.25, 0.1 % of the bbox diagonal)."
      },
      "weldToleranceMm": {
        "type": "number",
        "description": "Vertex weld distance in mm. Default max(1e-4, 1e-6 × bbox diagonal)."
      }
    }
  }

  arguments 46 lines copy
• get_latest_render unknown never probed

  Render a project's current model server-side and return it as an inline image so you can SEE what you built. Prefer open_in_studio for the happy path — it already includes an iso PNG preview in the same publish result when previewDelivered is true. Use this tool for a different `view`, a contact sheet (`view:"all"`), or when you only have a slug and are not publishing. Call with that `slug` to inspect whether the build looks right. CRITICAL — the image is rendered from the MODEL on the server; it does NOT reflect the user's Studio camera, zoom, or screen. NEVER ask the user to rotate, zoom, pan, move the camera, close a slider, or change their view to help you see — you cannot affect their screen and it cannot affect this render. To see a different angle, call this tool again with a different `view`. By DEFAULT (omit `view`, or `view:"all"`) it returns a CONTACT SHEET of all six canonical views in one labeled image — a 3×2 grid, top row [iso, front, right], bottom row [back, left, top] — so you can judge the model from every side regardless of its orientation (e.g. to find which side has the doors). Pass a single `view` (iso/front/back/left/right/top) for one large render of that angle. DETERMINISTIC: the same model + view always returns the same bytes — identical bytes are NOT a stale/lagging snapshot. If you changed the model, push it with open_in_studio FIRST, then re-render to see the change. The image is always current and never a blank capture. Colors and shading match Studio (same palette / base-material color). The slug is the capability: no OAuth for public/unlisted; private projects require the owner signed in. The PNG is base64-inlined as a real image block by default; pass `paths_only: true` for metadata only. No renderable geometry or a mesh failure → { ok: false, error, hint }, never a blank image.

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  {
    "type": "object",
    "required": [
      "slug"
    ],
    "properties": {
      "slug": {
        "type": "string",
        "minLength": 1,
        "description": "Project slug from open_in_studio/get_project/a /p/<slug> link. The slug is the capability — public/unlisted projects need no OAuth; private projects require the owner to be signed in."
      },
      "view": {
        "enum": [
          "all",
          "iso",
          "front",
          "back",
          "left",
          "right",
          "top"
        ],
        "type": "string",
        "description": "View to render. Default \"all\" = a labeled contact sheet of every canonical angle (iso/front/back/left/right/top) — best for judging the whole model. Pass a single view name for one large render of that angle."
      },
      "paths_only": {
        "type": "boolean",
        "description": "Controls PNG delivery. Default false: base64-inline the rendered PNG so clients that cannot fetch a URL over HTTP (e.g. a sandboxed agent) can still see it. Set true to return only metadata (smaller response)."
      }
    },
    "additionalProperties": false
  }

  arguments 31 lines copy
• open_in_studio unknown never probed

  Save/publish the current kernelCAD model AND display it in one step: persists the project, returns the interactive Studio viewer (MCP Apps / ChatGPT outputTemplate), and includes a PNG preview in the SAME tool result (image content + previewUrl when available). Use this when the user wants to SEE or share the model — do NOT call get_latest_render afterwards for the happy path; the preview is already here when previewDelivered is true. Pass the full `.kcad` source as `code` (optional if you just called evaluate_script — omitting reuses that last evaluated source). Multi-body assemblies must declare connectors + mates/joints before publish — otherwise evaluate_script fails with mechanism.orphan-part (disconnected components). Use type: 'axis' + revolute mates for shafts/hinges/gears; type: 'frame' + fastened for rigid mounts; or arm.revolute/.prismatic/.ball/.fixed. Connector types are only frame|axis|planar|ball. Pass `slug` from a previous call to update the same project in place; omit `slug` only for a new separate model. Status fields: ok=true means publish succeeded (under CDN, meshStatus ready/building; ok=false + meshStatus=failed means hard mesh persist failure — do not claim the viewer is ready). previewDelivered=true means this result carries a displayable PNG — only then may you tell the user a preview was shown. meshStatus mirrors get_project (ready|building|failed|missing). Under CDN, open_in_studio waits up to ~20s (OPEN_IN_STUDIO_MESH_SYNC_BUDGET_MS) for the revision mesh before returning; heavier publishes usually land meshStatus=ready. If still meshStatus=building + meshReady=false: TRANSIENT — meshUrl is the expected CDN pin; embed retries 404s. Poll get_project({slug}) until ready, or re-call open_in_studio with same code+slug — never treat building as permanent failure/404. ALWAYS pass `code` when you have it (avoid no_code_to_reuse); evaluate_script reuse is a fallback. Paint phases: projectSaved / meshReady / previewDelivered are set here; viewerPainted is ONLY true after widget ack (model context / widgetState) — never claim paint from this tool alone. Do NOT call get_model_mesh or get_latest_render for interactive paint. Pass include_preview:false to skip the rasterizer (save + viewer URLs only). Trigger phrases: "open it in Studio", "let me see it", "show me the model"; also call after you finish a build and after each meaningful revision while iterating. ORGANIC/CAR SUCCESS GATE: for final likeness claims pass likeness_profile:"automotive" (and body_bbox/wheels/still_verdicts, or a prior verify body-likeness pass for this code). If the gate fails, ok:false with DX reference.likeness.publish-blocked|gate-required — do not claim success. Omit likeness_profile for WIP previews only.

  mcp-tool

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  {
    "type": "object",
    "required": [],
    "properties": {
      "code": {
        "type": "string",
        "minLength": 1,
        "description": "The full .kcad source of the model to open in Studio (the script you have been editing). Optional: omit to reuse the source from your most recent evaluate_script call."
      },
      "slug": {
        "type": "string",
        "minLength": 1,
        "description": "Slug returned by a previous open_in_studio call. When given, updates that existing project in place (live-updating the user's open Studio tab) instead of creating a new one."
      },
      "title": {
        "type": "string",
        "description": "Optional human-readable title for the model (shown in Studio). Defaults to \"Model from Claude\"."
      },
      "wheels": {
        "type": "array",
        "items": {
          "type": "object"
        },
        "description": "Wheel centres + radii for likeness gate [{ center:[x,y,z], radius }]."
      },
      "body_bbox": {
        "type": "object",
        "description": "Body AABB { min:[x,y,z], max:[x,y,z] } mm — for likeness_profile gate when no session attest."
      },
      "cabin_bbox": {
        "type": "object",
        "description": "Optional cabin AABB for likeness gate."
      },
      "parameters": {
        "type": "array",
        "items": {
          "type": "object",
          "required": [
            "name",
            "defaultValue",
            "kind"
          ],
          "properties": {
            "max": {
              "type": "number",
              "description": "Optional inclusive upper bound (numeric params)."
            },
            "min": {
              "type": "number",
              "description": "Optional inclusive lower bound (numeric params)."
            },
            "kind": {
              "enum": [
                "number",
                "integer",
                "boolean",
                "string"
              ],
              "type": "string",
              "description": "Control type Studio should render for this parameter."
            },
            "name": {
              "type": "string",
              "maxLength": 40,
              "minLength": 1,
              "description": "Parameter identifier as used in the script (e.g. \"width\")."
            },
            "step": {
              "type": "number",
              "description": "Optional slider/step increment (numeric params)."
            },
            "unit": {
              "type": "string",
              "maxLength": 8,
              "description": "Optional unit label shown next to the control (e.g. \"mm\", \"deg\")."
            },
            "description": {
              "type": "string",
              "maxLength": 200,
              "description": "Optional human-readable explanation of the parameter."
            },
            "defaultValue": {
              "oneOf": [
                {
                  "type": "number"
                },
                {
                  "type": "boolean"
                },
                {
                  "type": "string"
                }
              ],
              "description": "Current/default value of the parameter; type matches `kind`."
            }
          }
        },
        "description": "Optional list of the model's editable parameters, so Studio can render parameter controls. Each item is one control derived from the .kcad params."
      },
      "attachments": {
        "type": "array",
        "items": {
          "type": "object",
          "required": [
            "path"
          ],
          "properties": {
            "path": {
              "type": "string",
              "maxLength": 240,
              "minLength": 1
            },
            "assetSha256": {
              "type": "string",
              "pattern": "^[a-f0-9]{64}$"
            },
            "bytesBase64": {
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "maxItems": 32,
        "description": "Complementary project files referenced by relative path from the .kcad source."
      },
      "require_stills": {
        "type": "boolean",
        "description": "Forwarded to body-likeness gate (default true)."
      },
      "still_verdicts": {
        "type": "array",
        "items": {
          "type": "object"
        },
        "description": "Agent still checklist for likeness gate [{ code, passed, finding, view? }]."
      },
      "include_preview": {
        "type": "boolean",
        "description": "Default true: render an iso PNG preview into this same tool result (reuses the server render cache when this source was already rendered). Set false to skip rasterization and return save/viewer URLs only."
      },
      "likeness_profile": {
        "enum": [
          "automotive"
        ],
        "type": "string",
        "description": "Hard success gate for organic/car bodies. When set, open_in_studio returns ok:false unless body-likeness is publishReady (inline body_bbox/wheels/still_verdicts, or a prior verify body-likeness pass for this exact code). Omit for WIP previews."
      }
    },
    "additionalProperties": false
  }

  arguments 150 lines copy
• inspect unknown never probed

  Use this when you need to read facts about a model. One reader, selected by `of`: - 'assembly' — physical assembly inventory (parts, bboxes, connectors, mates, disconnected solids). - 'robot' — URDF/SDFormat export preview (links, joints, planning groups, end-effectors, issues). - 'step' — inspect an imported STEP file. - 'shape' — volume / surfaceArea / bbox for one feature ({ feature_id? }). - 'mass' — mass, centre of mass, centroidal inertia tensor (inertia6 + 3x3 inertiaMatrix), principalMoments/principalAxes, symmetry flags, and optionally the radius of gyration about an arbitrary axis ({ feature_id?, density?, gyration_axis? }); density in kg/m^3, defaults to 1000 (water). - 'features' — features captured by the script (kind, id, params, transforms, suppression). - 'assemblies' — assembly intent (assemblies, parts, connectors, joints). - 'topology' — canonical face names + edge count for a feature ({ feature_id? }). - 'edges' — edges of a shape with optional EdgeQuery ({ feature_id?, query? }); returns @kc[...] refs. - 'face-edges' — boundary edges of a named canonical face ({ feature_id?, face_name }). - 'faces' — faces of a shape with optional FaceQuery ({ feature_id?, query? }); returns @kc[...] refs. - 'face-labels' — user-applied labels visible in the script. - 'mates' — mates captured by the script. - 'constraints' — sketch constraints captured by the script. - 'part-stats' — bundled parts-catalog statistics. - 'bend-table' — sheet-metal bend table for a flattened pattern. - 'params' — declared model parameters. - 'part-categories' — top-level part-catalog categories available in the bundled (and configured remote) catalog. - 'part-families' — part families within a category ({ category? }); count + exemplar ids per family. - 'bom' — bill of materials ({ assembly? }): one row per distinct part (grouped by geometry/catalog identity, not name) with real instance quantity, kind ('fabricated'|'purchased'), material, density, per-unit and total mass, bbox, a fabrication process hint, catalog provenance for purchased parts, and totals; `bom.*` diagnostics flag rows with no density source or missing catalog vendor info instead of guessing. - 'section' — numeric cross-section probe of a shape: area, perimeter, loop/hole counts, 2D bbox at a plane ({ feature_id?, plane | at+axis, stack?: { from, to, count, axis? } }). `stack` scans evenly spaced slices and returns `minAreaIndex`/`minAreaPosition` — use it to find the neck/thinnest cross-section along an axis. - 'continuity' — G0/G1/G2 classification of shared edges ({ feature_id?, edges? }); position gap, normal jump, curvature difference, worst-sample XYZ. - 'curvature' — per-face Gaussian and mean curvature min/max/mean, inflections, spikes ({ feature_id?, faces?, spike_factor? }). All params except `of` are subject-specific and forwarded verbatim. Most subjects accept { file | code }.

  mcp-tool

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  {
    "type": "object",
    "required": [
      "of"
    ],
    "properties": {
      "at": {
        "type": "number",
        "description": "of:'section' — single slice position along `axis` (mm)."
      },
      "of": {
        "enum": [
          "assembly",
          "robot",
          "step",
          "shape",
          "mass",
          "features",
          "assemblies",
          "topology",
          "edges",
          "face-edges",
          "faces",
          "face-labels",
          "mates",
          "constraints",
          "part-stats",
          "bend-table",
          "params",
          "part-categories",
          "part-families",
          "bom",
          "section",
          "continuity",
          "curvature"
        ],
        "type": "string",
        "description": "Which facts to read."
      },
      "axis": {
        "enum": [
          "x",
          "y",
          "z"
        ],
        "type": "string",
        "description": "of:'section' — normal axis for `at` / `stack` (default 'z')."
      },
      "code": {
        "type": "string",
        "description": "Inline kernelCAD script source."
      },
      "file": {
        "type": "string",
        "description": "Path to a .kcad.ts script file."
      },
      "edges": {
        "description": "of:'continuity' — optional EdgeQuery or @kc[...] ref(s) limiting which shared edges are sampled."
      },
      "faces": {
        "description": "of:'curvature' — optional FaceQuery or @kc[...] ref(s) limiting which faces are sampled."
      },
      "plane": {
        "type": [
          "string",
          "object"
        ],
        "description": "of:'section' — section plane. Either a cardinal name string 'xy'|'xz'|'yz', { plane: 'xy'|'xz'|'yz', offset? }, or { origin: [x,y,z], normal: [nx,ny,nz] }. Omit to use `at`+`axis`."
      },
      "query": {
        "type": "object",
        "description": "of:'edges'|'faces' — optional EdgeQuery/FaceQuery filter."
      },
      "stack": {
        "type": "object",
        "required": [
          "from",
          "to",
          "count"
        ],
        "properties": {
          "to": {
            "type": "number",
            "description": "End position along the axis (mm)."
          },
          "axis": {
            "enum": [
              "x",
              "y",
              "z"
            ],
            "type": "string",
            "description": "Scan axis (default 'z')."
          },
          "from": {
            "type": "number",
            "description": "Start position along the axis (mm)."
          },
          "count": {
            "type": "integer",
            "description": "Number of evenly spaced slices (>= 1)."
          }
        },
        "description": "of:'section' — dense scan: `count` slices evenly spaced from `from` to `to` along `axis`; response reports minAreaIndex/minAreaPosition."
      },
      "density": {
        "type": "number",
        "description": "of:'mass' — material density in kg/m^3 (steel 7850, aluminium 2700, ABS 1050). Defaults to 1000 (water); the response echoes the value used and flags when it was defaulted."
      },
      "assembly": {
        "type": "string",
        "description": "of:'assembly'|'robot'|'bom' — assembly name; defaults to the first captured assembly."
      },
      "category": {
        "type": "string",
        "description": "of:'part-families' — optional top-level category to filter families by."
      },
      "face_name": {
        "enum": [
          "top",
          "bottom",
          "left",
          "right",
          "front",
          "back"
        ],
        "type": "string",
        "description": "of:'face-edges' — canonical face name (required for that subject)."
      },
      "feature_id": {
        "type": "string",
        "description": "of:'shape'|'mass'|'topology'|'edges'|'faces'|'face-edges'|'face-labels' — FeatureId; defaults to the last returned shape."
      },
      "spike_factor": {
        "type": "number",
        "description": "of:'curvature' — spike sensitivity as a multiple of the face's Gaussian stddev (default 6)."
      },
      "gyration_axis": {
        "type": "object",
        "required": [
          "origin",
          "direction"
        ],
        "properties": {
          "origin": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 3,
            "minItems": 3,
            "description": "A point on the axis, shape-local mm."
          },
          "direction": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 3,
            "minItems": 3,
            "description": "Axis direction; normalised internally, so it need not be a unit vector."
          }
        },
        "description": "of:'mass' — optional axis in shape-local mm to report the radius of gyration about. Omit for centroidal quantities only; the result is density-independent and returned in mm."
      }
    }
  }

  arguments 167 lines copy
• verify unknown never probed

  Use this when you need to check a design against a rule set. One verifier, selected by `check`: - 'assembly' — mate-aware assembly validator on the active session (run evaluate_script first). - 'urdf' — structural validity of a .urdf file ({ urdf_path }). - 'dfm' — print-readiness gates declared by dfmSpec() ({ file | code }). - 'dfm-preflight' — sheet-metal flat pattern vs a job-shop's ordering rules ({ vendor, material, thicknessIn|thicknessMm, ... }). - 'swept-collision' — sweep declared joint range(s) and report colliding poses. - 'reachable' — inverse-kinematics reachability for an end-effector ({ tip_link, target_position, ... }). - 'mounting-holes' — fastened mates expose matching hole diameters on both sides. - 'load-capacity' — closed-form Euler-Bernoulli beam stress / safety-factor check ({ loads, materials, ... }). - 'static-hold' — gravitational holding torque/force at a sampled pose grid vs each actuated joint's declared actuator capacity ({ joint?, pose?, gravity?, min_torque_margin_pct?, range_samples? }). - 'body-likeness' — publish gate for organic/car bodies: cheap AABB↔wheel checks plus required agent still verdicts (side-body-over-wheels, side-cabin-aft, rear-haunch, ortho-proportions-vs-reference). Pass { body_bbox | code/file+body_feature_id, wheels?, cabin_bbox?, still_verdicts?, require_stills? }. Full CV silhouette matching is NOT implemented — agents must inspect ortho PNGs/Studio and supply still_verdicts before claiming success. All params except `check` are check-specific and forwarded verbatim; each check fails closed on its own missing required params.

  mcp-tool

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  {
    "type": "object",
    "required": [
      "check"
    ],
    "properties": {
      "dxf": {
        "type": "string",
        "description": "check:'dfm-preflight' — path to a DXF file."
      },
      "code": {
        "type": "string",
        "description": "Inline kernelCAD script source (same checks as `file`)."
      },
      "file": {
        "type": "string",
        "description": "Path to a .kcad.ts script (assembly/dfm/dfm-preflight/swept-collision/reachable/mounting-holes/load-capacity/static-hold)."
      },
      "mode": {
        "enum": [
          "stub",
          "beam"
        ],
        "type": "string",
        "description": "check:'load-capacity' — 'beam' (default) or 'stub'."
      },
      "pose": {
        "description": "check:'static-hold' — explicit pose (joint name -> deg/mm) or array of poses; omit to sample a grid across the evaluated joint's range."
      },
      "seed": {
        "type": "object",
        "description": "check:'reachable' — numeric IK seed pose (joint name -> deg/mm)."
      },
      "check": {
        "enum": [
          "assembly",
          "urdf",
          "dfm",
          "dfm-preflight",
          "swept-collision",
          "reachable",
          "mounting-holes",
          "load-capacity",
          "static-hold",
          "body-likeness"
        ],
        "type": "string",
        "description": "Which verification to run."
      },
      "joint": {
        "type": "string",
        "description": "check:'swept-collision' — joint to sweep; omit to sweep every declared joint. check:'static-hold' — joint to evaluate; omit to evaluate every joint with a declared actuator."
      },
      "loads": {
        "type": "object",
        "description": "check:'load-capacity' — partName -> { force?: [Fx,Fy,Fz] N, torque?: [Tx,Ty,Tz] N*m }."
      },
      "range": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "maxItems": 3,
        "minItems": 3,
        "description": "check:'swept-collision' — [lower, upper, step] in joint-native units."
      },
      "vendor": {
        "type": "string",
        "description": "check:'dfm-preflight' — vendor SKU (required for that check)."
      },
      "wheels": {
        "type": "array",
        "items": {
          "type": "object"
        },
        "description": "check:'body-likeness' — wheel centres + tire radii [{ center:[x,y,z], radius }]."
      },
      "gravity": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "maxItems": 3,
        "minItems": 3,
        "description": "check:'static-hold' — gravity vector, m/s^2, world frame (default [0, 0, -9.81])."
      },
      "service": {
        "enum": [
          "laser",
          "cnc-router",
          "waterjet",
          "bending"
        ],
        "type": "string",
        "description": "check:'dfm-preflight' — service."
      },
      "assembly": {
        "type": "string",
        "description": "Assembly name; defaults to the first captured assembly."
      },
      "material": {
        "type": "string",
        "description": "check:'dfm-preflight' — material SKU (required for that check)."
      },
      "tip_link": {
        "type": "string",
        "description": "check:'reachable' — end-effector part name (required for that check)."
      },
      "body_bbox": {
        "type": "object",
        "description": "check:'body-likeness' — body AABB { min:[x,y,z], max:[x,y,z] } in mm."
      },
      "featureId": {
        "type": "string",
        "description": "check:'dfm-preflight' — FeatureId to scope to."
      },
      "materials": {
        "type": "object",
        "description": "check:'load-capacity' — partName -> material declaration."
      },
      "urdf_path": {
        "type": "string",
        "description": "check:'urdf' — path to the .urdf file."
      },
      "cabin_bbox": {
        "type": "object",
        "description": "check:'body-likeness' — optional cabin/greenhouse AABB for automated cabin-aft."
      },
      "length_axis": {
        "enum": [
          "x",
          "y"
        ],
        "type": "string",
        "description": "check:'body-likeness' — wheelbase axis (default 'x')."
      },
      "thicknessIn": {
        "type": "number",
        "description": "check:'dfm-preflight' — material thickness in inches."
      },
      "thicknessMm": {
        "type": "number",
        "description": "check:'dfm-preflight' — material thickness in millimeters."
      },
      "prefer_solver": {
        "enum": [
          "analytical",
          "numeric",
          "auto"
        ],
        "type": "string",
        "description": "check:'reachable' — force the IK path ('auto' default)."
      },
      "range_samples": {
        "type": "number",
        "description": "check:'static-hold' — grid density per evaluated joint when `pose` is omitted (default 9)."
      },
      "max_iterations": {
        "type": "number",
        "description": "check:'reachable' — numeric-path iteration cap."
      },
      "refreshCatalog": {
        "type": "boolean",
        "description": "check:'dfm-preflight' — force vendor catalog refresh."
      },
      "require_stills": {
        "type": "boolean",
        "description": "check:'body-likeness' — require still_verdicts (default true)."
      },
      "still_verdicts": {
        "type": "array",
        "items": {
          "type": "object"
        },
        "description": "check:'body-likeness' — agent ortho still checklist [{ code, passed, finding, view? }]. Required codes: side-body-over-wheels, side-cabin-aft, rear-haunch, ortho-proportions-vs-reference."
      },
      "body_feature_id": {
        "type": "string",
        "description": "check:'body-likeness' — FeatureId to read body AABB from when body_bbox omitted."
      },
      "target_position": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "maxItems": 3,
        "minItems": 3,
        "description": "check:'reachable' — target [x, y, z] mm (world frame)."
      },
      "target_orientation": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "maxItems": 3,
        "minItems": 3,
        "description": "check:'reachable' — target XYZ Euler angles in radians."
      },
      "min_torque_margin_pct": {
        "type": "number",
        "description": "check:'static-hold' — safety-margin floor as a percent of actuator capacity (default 20)."
      },
      "position_tolerance_mm": {
        "type": "number",
        "description": "check:'reachable' — position tolerance in mm."
      },
      "collision_tolerance_mm3": {
        "type": "number",
        "description": "check:'swept-collision' — BREP intersection volume tolerance (mm^3)."
      },
      "safety_factor_threshold": {
        "type": "number",
        "description": "check:'load-capacity' — pass/fail safety-factor floor (default 1.5)."
      },
      "orientation_tolerance_rad": {
        "type": "number",
        "description": "check:'reachable' — orientation tolerance in radians."
      }
    }
  }

  arguments 220 lines copy
• run_fea unknown never probed

  Use this when you need to know whether a part will hold a load. Runs the linear-static structural study a script declares with `shape.feaStudy({ material, fixed, loads, meshSize?, minSafetyFactor? })`: meshes the solid with quadratic tetrahedra, solves it with CalculiX, and returns evidence — peak von Mises stress (MPa), peak displacement (mm), the minimum safety factor against the material yield, per-region hot spots named by @kc[...] face ref, mesh-quality trust flags, an equilibrium residual, and stress-heatmap PNG paths. Requires the external solver toolchain (CalculiX `ccx` plus the gmsh Python module). When it is absent the call fails with `fea.solver.unavailable` and the exact install command — never a silent pass. Pass { file | code }, optional `study` (defaults to the last declared study), `output_dir` (keeps the .inp/.frd deck for reproduction), `mesh_size` (mm, overrides the study for this run), and `heatmaps: false` for a fast numbers-only run.

  mcp-tool

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  {
    "type": "object",
    "properties": {
      "code": {
        "type": "string",
        "description": "Inline kernelCAD script source (mutually exclusive with file)."
      },
      "file": {
        "type": "string",
        "description": "Path to a .kcad.ts script declaring at least one feaStudy."
      },
      "study": {
        "type": "string",
        "description": "Name of the study to run; defaults to the last declared one."
      },
      "heatmaps": {
        "type": "boolean",
        "description": "Render stress heatmap PNGs (default true)."
      },
      "mesh_size": {
        "type": "number",
        "description": "Target element size in mm, overriding the study for this run."
      },
      "output_dir": {
        "type": "string",
        "description": "Directory for the solver deck, results, summary JSON and heatmap PNGs."
      },
      "mesh_timeout_ms": {
        "type": "number",
        "description": "Wall-clock budget for meshing (default 120000)."
      },
      "solve_timeout_ms": {
        "type": "number",
        "description": "Wall-clock budget for the solve (default 300000)."
      }
    }
  }

  arguments 37 lines copy
• fea_summary unknown never probed

  Use this when you need a structural check's context without paying for a solve. Read-only: returns the stored summary of a previous run_fea (pass the same `output_dir`), whether the CalculiX + gmsh toolchain is available on this machine (with the install command when it is not), and the FEA material table with real E / Poisson / yield numbers so a grade is chosen against data rather than from memory. Never meshes, solves, or writes.

  mcp-tool

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  {
    "type": "object",
    "properties": {
      "output_dir": {
        "type": "string",
        "description": "Directory a previous run_fea wrote to; omit for toolchain status + material table only."
      }
    }
  }

  arguments 9 lines copy
• sweep_tolerance unknown never probed

  Use this when you need to check whether a mechanism stays buildable across a tolerance/dimension range, not just at one nominal value. Declares one or more param() names with a { values: [...] } list or a { min, max, steps } range, re-evaluates the script once per cartesian-product combination (capped at 64 combos — exceeding it truncates to the first 64 and emits kinematic.sweep-tolerance.combo-cap-exceeded), and runs the standard gates on each combo: interference, mounting-hole diameter agreement, and joint-axis binding (all three, default on); reachability only when gates.reachable names a tip_link + target. Returns the pass/fail envelope table (one row per combo) plus firstFailure per gate — the fastest way to find the first param value at which a design breaks.

  mcp-tool

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  {
    "type": "object",
    "required": [
      "params"
    ],
    "properties": {
      "code": {
        "type": "string",
        "description": "Inline kernelCAD script source."
      },
      "file": {
        "type": "string",
        "description": "Path to a .kcad.ts script file."
      },
      "gates": {
        "type": "object",
        "properties": {
          "jointAxis": {
            "type": "boolean",
            "description": "Default true."
          },
          "reachable": {
            "type": "object",
            "required": [
              "tipLink",
              "targetPosition"
            ],
            "properties": {
              "tipLink": {
                "type": "string"
              },
              "targetPosition": {
                "type": "array",
                "items": {
                  "type": "number"
                },
                "maxItems": 3,
                "minItems": 3
              },
              "targetOrientation": {
                "type": "array",
                "items": {
                  "type": "number"
                },
                "maxItems": 3,
                "minItems": 3
              }
            },
            "description": "Runs the reachability gate when set."
          },
          "interference": {
            "type": "boolean",
            "description": "Default true."
          },
          "mountingHoles": {
            "type": "boolean",
            "description": "Default true."
          }
        },
        "description": "Which standard gates to run per combo."
      },
      "params": {
        "type": "object",
        "description": "param() name -> { values: [number|string, ...] } or { min, max, steps }."
      },
      "assembly": {
        "type": "string",
        "description": "Assembly name; defaults to the first captured assembly."
      }
    }
  }

  arguments 71 lines copy
• why_did_this_fail unknown never probed

  Use this when you need to trace why a feature failed. Walk the upstream chain of a failing feature. Returns the diagnostics of the requested feature plus the diagnostics of every upstream feature in topological order (the requested feature is the last entry). Per-code hints are inline on every diagnostic — call lookup_diagnostics for the full catalogue. Pass { file?, code?, feature_id? }.

  mcp-tool

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  {
    "type": "object",
    "properties": {
      "code": {
        "type": "string"
      },
      "file": {
        "type": "string"
      },
      "feature_id": {
        "type": "string"
      }
    }
  }

  arguments 14 lines copy
• review_cad unknown never probed

  Use this when you need to review a mechanism for fitness and repair mode. Run the deterministic CAD review loop: evaluate the script, validate the assembly/mate graph, check mate connectors touch modeled material, sample declared mate limits, optionally check interferences at sampled poses, report connector workspace bounds, and return a mechanism fitness verdict for agent self-review. Fitness includes repairMode: none, local-fix, parameter-tune, or topology-redesign.

  mcp-tool

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  {
    "type": "object",
    "properties": {
      "code": {
        "type": "string",
        "description": "Inline kernelCAD script source."
      },
      "file": {
        "type": "string",
        "description": "Path to a .kcad.ts script file."
      },
      "assembly": {
        "type": "string",
        "description": "Assembly name; defaults to the first captured assembly."
      },
      "designGoal": {
        "type": "string",
        "description": "Original user design prompt or goal. Included in suggestedRepairPrompt so topology-redesign repairs restart from the intended physical design instead of local coordinate nudges."
      },
      "epsilonMm3": {
        "type": "number",
        "description": "Interference volume threshold in mm^3. Default 0.01."
      },
      "combinatorial": {
        "type": "boolean",
        "description": "Sample all 2^N limit-corner combinations across mates with declared limits. Capped at 8 mates with limits; combine with samplesPerMate for both interior coverage and worst-pose detection. Default false."
      },
      "samplesPerMate": {
        "type": "integer",
        "minimum": 1,
        "description": "Pose-envelope samples per declared-limit mate. 1 (default) = corners only; >=3 adds uniform interior points between min and max. Total samples per non-locked mate = samplesPerMate."
      },
      "gripperAperture": {
        "type": "object",
        "properties": {
          "left": {
            "type": "string",
            "description": "Left fingertip connector ref such as \"left-finger.tip\"."
          },
          "right": {
            "type": "string",
            "description": "Right fingertip connector ref such as \"right-finger.tip\"."
          }
        },
        "description": "Optional fingertip connector refs for gripper aperture travel reporting."
      },
      "trackConnectors": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "Optional connector refs such as [\"gripper-plate.tool-tip\"] to limit connector workspace reporting."
      },
      "preserveInterfaces": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "External mates, connector refs, part names, or behavioral interfaces the repair agent must preserve during redesign."
      },
      "includeInterference": {
        "type": "boolean",
        "description": "Whether sampled poses run BREP interference checks. Default true."
      },
      "includePoseEnvelope": {
        "type": "boolean",
        "description": "Whether to sample declared mate limits. Default true."
      },
      "requirePhysicalUseCase": {
        "type": "boolean",
        "description": "When true, articulated assemblies must declare arm.physicalUseCase(...) evidence: loads, contacts, stable parts, and actuator limits."
      },
      "includePhysicalUseCaseStatics": {
        "type": "boolean",
        "description": "Run opt-in pose-bound quasi-static certification at the exact common-contact samples: conservative friction/capacity, world force and moment balance, and finite-difference revolute actuator torque. Returns physicalUseCaseStaticCertificates on success; sampled linearized failures remain blocking diagnostics."
      },
      "includePhysicalUseCaseReachability": {
        "type": "boolean",
        "description": "Run targeted physical-use-case reachability sampling over scalar-limited mates named in actuatorLimits. Reject contacts that cannot get within criteria.maxSlipMm and multi-contact use cases that cannot satisfy every contact in the same sampled actuator pose. Samples revolute/cylindrical/pin-slot limitsDeg and prismatic limitsMm. Defaults to requirePhysicalUseCase."
      },
      "includePhysicalUseCaseJointReactions": {
        "type": "boolean",
        "description": "Derive exact-pose reaction wrenches through uniquely rooted articulated trees and compare every loaded mate against a complete declared resultant force/moment envelope. Implies physical-use-case reachability and statics."
      },
      "includePhysicalUseCaseJointStructure": {
        "type": "boolean",
        "description": "Run geometry/material clevis double-shear, pin-bending, bearing, tear-out, and net-section checks with minimum factor of safety 2. Unsupported axial or perpendicular-moment load cases remain blockers. Implies joint reactions, statics, and reachability."
      },
      "physicalUseCaseReachabilitySamplesPerMate": {
        "type": "integer",
        "minimum": 1,
        "description": "Samples per scalar-limited actuator mate for physical-use-case contact reachability. Samples revolute/cylindrical/pin-slot limitsDeg and prismatic limitsMm. Default 3; total targeted combinations are capped."
      }
    }
  }

  arguments 95 lines copy
• design_loop unknown never probed

  Use this when the goal is complex / production / enclosure / gearbox / robot-arm / multi-body, or when you need evaluate→review/verify→revise until green. PREFERRED over one-shot evaluate_script+open_in_studio for Adam-level parts. Runs a CAD design loop over attempt scripts: review_cad each attempt, continue past functional attempts with unresolved warnings, return repair prompts (nextActionPrompt) plus structured revisionAssist (suggestedPatches / autoApplied.suggestedCode for repairable feature failures; cookbook steers for stacked-primitive toys). Stop on ok or convergence.escalate. For organic/car bodies set likenessProfile:"automotive" and pass bodyLikeness (or automotive stills on visualReview.checks) — attempts fail closed until body-likeness is publishReady. Optionally write a Studio build record JSON.

  mcp-tool

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  {
    "type": "object",
    "required": [
      "goal",
      "attempts"
    ],
    "properties": {
      "goal": {
        "type": "string",
        "description": "Original user design goal. Fed into every review_cad repair prompt."
      },
      "assembly": {
        "type": "string"
      },
      "attempts": {
        "type": "array",
        "items": {
          "type": "object",
          "anyOf": [
            {
              "required": [
                "file"
              ]
            },
            {
              "required": [
                "code"
              ]
            }
          ],
          "properties": {
            "id": {
              "type": "string"
            },
            "code": {
              "type": "string",
              "description": "Inline kernelCAD script source. Provide file or code."
            },
            "file": {
              "type": "string",
              "description": "Path to a .kcad.ts script on disk. Provide file or code."
            },
            "title": {
              "type": "string"
            },
            "visualReview": {
              "type": "object",
              "required": [
                "accepted",
                "findings"
              ],
              "properties": {
                "checks": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "required": [
                      "code",
                      "passed",
                      "finding"
                    ],
                    "properties": {
                      "code": {
                        "type": "string"
                      },
                      "passed": {
                        "type": "boolean"
                      },
                      "finding": {
                        "type": "string"
                      },
                      "screenshotPath": {
                        "type": "string"
                      }
                    }
                  },
                  "description": "Required checklist entries: main-object-count, proportions-match-reference, required-visible-features, no-stray-or-floating-geometry, attachment-plausibility, semantic-orientation-alignment, device-depth-and-construction, canonical-views-physically-coherent."
                },
                "accepted": {
                  "type": "boolean"
                },
                "findings": {
                  "type": "array",
                  "items": {
                    "type": "string"
                  }
                },
                "screenshotPath": {
                  "type": "string"
                }
              },
              "description": "Optional. Evidence from the reviewing agent after rendering/opening screenshots. Accepted reviews must include screenshotPath, concrete findings, and all required checks passing."
            }
          }
        },
        "description": "Ordered design attempts. Each item is { id?, title?, file? OR code?, visualReview? } — provide file or code (at least one). File attempts can be replayed by Studio build records."
      },
      "autoRevise": {
        "type": "boolean",
        "description": "When true (default), failing attempts with repairable feature diagnostics (boolean miss, oversized fillet, …) run bounded repair_script and attach revisionAssist.suggestedPatches / autoApplied.suggestedCode. Set false to skip the extra repair pass (hints-only). Does not autonomously rewrite full CAD models."
      },
      "epsilonMm3": {
        "type": "number",
        "description": "Forwarded to review_cad."
      },
      "stopOnPass": {
        "type": "boolean",
        "description": "Stop after the first attempt that is functional and passes the quality gate. Default true."
      },
      "recordTitle": {
        "type": "string",
        "description": "Optional title for the build record."
      },
      "bodyLikeness": {
        "type": "object",
        "properties": {
          "wheels": {
            "type": "array",
            "items": {
              "type": "object"
            }
          },
          "body_bbox": {
            "type": "object"
          },
          "cabin_bbox": {
            "type": "object"
          },
          "length_axis": {
            "enum": [
              "x",
              "y"
            ],
            "type": "string"
          },
          "require_stills": {
            "type": "boolean"
          },
          "still_verdicts": {
            "type": "array",
            "items": {
              "type": "object"
            }
          }
        },
        "description": "When likenessProfile=automotive: body_bbox (required for gate), wheels, cabin_bbox, still_verdicts. Missing body_bbox fails with reference.likeness.gate-required. Stills may also come from visualReview.checks."
      },
      "combinatorial": {
        "type": "boolean",
        "description": "Sample all 2^N limit-corner combinations across mates with declared limits. Capped at 8 mates with limits; combine with samplesPerMate for both interior coverage and worst-pose detection. Default false."
      },
      "samplesPerMate": {
        "type": "integer",
        "minimum": 1,
        "description": "Pose-envelope samples per declared-limit mate. 1 (default) = corners only; >=3 adds uniform interior points between min and max. Total samples per non-locked mate = samplesPerMate."
      },
      "gripperAperture": {
        "type": "object",
        "description": "Optional gripper aperture request forwarded to review_cad."
      },
      "likenessProfile": {
        "enum": [
          "automotive"
        ],
        "type": "string",
        "description": "When 'automotive', require organic-body still checks on visualReview AND the body-likeness publish gate (pass bodyLikeness or stills on checks). Attempts stay non-ok until publishReady. Final open_in_studio must pass likeness_profile:'automotive' (server hard-gates success)."
      },
      "trackConnectors": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "Connector refs to track across sampled poses."
      },
      "outputRecordPath": {
        "type": "string",
        "description": "Optional JSON path to write a Studio-compatible build record."
      },
      "preserveInterfaces": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "External mates, connector refs, part names, or behavioral interfaces the agent must preserve between attempts."
      },
      "allowReviewWarnings": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "Warning diagnostic codes the original prompt explicitly allows. Other review warnings keep the loop iterating even if review_cad is functionally ok."
      },
      "includeInterference": {
        "type": "boolean",
        "description": "Forwarded to review_cad. Default true."
      },
      "includePoseEnvelope": {
        "type": "boolean",
        "description": "Forwarded to review_cad. Default true."
      },
      "requireVisualReview": {
        "type": "boolean",
        "description": "Require screenshot-backed visualReview with structured checks before accepting an attempt. Default true; set false only for explicit non-visual batch checks."
      },
      "requirePhysicalAcceptance": {
        "type": "boolean",
        "description": "Require declared physicalUseCase common-pose reachability and pose-bound quasi-static certification before accepting an attempt. Design-loop also enables this automatically when an attempt script calls physicalUseCase(...)."
      }
    }
  }

  arguments 210 lines copy
• flatten_pattern unknown never probed

  Use this when you need the unfolded flat pattern of a bent sheet-metal part. Return the unfolded 2D flat-pattern of a bent sheet-metal Shape as a Region (outer polyline + holes + bend lines + sketch plane). Slice 1: at most 2 bends. Pass { file } or { code }; optional { featureId } to pick a specific Shape.

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  {
    "type": "object",
    "properties": {
      "code": {
        "type": "string"
      },
      "file": {
        "type": "string"
      },
      "featureId": {
        "type": "string"
      }
    }
  }

  arguments 14 lines copy
• send_to_printer unknown never probed

  Use this when you need to upload a .gcode file (e.g. written by export with target: "model", format: "gcode") to a real network printer and, by default, start the print. protocol: 'octoprint' (POST /api/files/local with an X-Api-Key), 'moonraker' (Klipper's POST /server/files/upload), or 'bambu-lan' (Bambu Lab LAN-mode: FTPS implicit-TLS upload on port 990 as user 'bblp' with the printer's LAN access code, then an MQTT print-start command on port 8883 — requires access_code and, unless start_print is false, serial). Pass { dry_run: true } to validate connectivity/authentication only, without uploading or starting a print. Never logs or echoes api_key/access_code.

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  {
    "type": "object",
    "required": [
      "gcode_path",
      "protocol",
      "host"
    ],
    "properties": {
      "host": {
        "type": "string",
        "description": "Printer hostname or IP."
      },
      "port": {
        "type": "number",
        "description": "Override the protocol default port."
      },
      "serial": {
        "type": "string",
        "description": "Bambu printer serial number (required to start a print unless start_print is false)."
      },
      "api_key": {
        "type": "string",
        "description": "OctoPrint API key (Settings -> API)."
      },
      "dry_run": {
        "type": "boolean",
        "description": "Validate connectivity/auth only; never uploads or starts a print."
      },
      "filename": {
        "type": "string",
        "description": "Uploaded file name (default: 'kernelcad.gcode')."
      },
      "protocol": {
        "enum": [
          "octoprint",
          "moonraker",
          "bambu-lan"
        ],
        "type": "string"
      },
      "gcode_path": {
        "type": "string",
        "description": "Path to the .gcode file on disk."
      },
      "access_code": {
        "type": "string",
        "description": "Bambu LAN-mode access code (printer settings -> LAN Only Mode)."
      },
      "start_print": {
        "type": "boolean",
        "description": "Start the print immediately after upload (default: true)."
      }
    }
  }

  arguments 54 lines copy
• get_project_revision unknown never probed

  Fetch the exact immutable .kcad source and parameters captured at a prior `open_in_studio` version. Use this to read-after-write verify a release: pass the returned `slug` and `version`, then hash or inspect the returned source. Public/unlisted projects use the slug as capability; private projects require the owner's OAuth connection.

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  {
    "type": "object",
    "required": [
      "slug",
      "version"
    ],
    "properties": {
      "slug": {
        "type": "string",
        "minLength": 1,
        "description": "Project slug returned by open_in_studio."
      },
      "version": {
        "type": "integer",
        "minimum": 1,
        "description": "Positive immutable revision version returned by open_in_studio."
      }
    },
    "additionalProperties": false
  }

  arguments 20 lines copy
• repair_script unknown never probed

  Use this when evaluate_script reported an error and you want the fix applied rather than described. Takes the candidates why_did_this_fail derives for a diagnostic, applies them one at a time, re-evaluates after each, and keeps the first that clears the diagnostic without introducing new errors. Never edits outside the repair region (failing feature statement + its input statements + the param() lines it reads) — an out-of-region patch is refused with tool.repair.out-of-region. Returns the repaired source in `new_code` (the caller persists it), a unified `diff`, and before/after health maps. Pass { file? | code?, diagnostic?: '<id>'|'first-error', strategy?: 'apply-first'|'try-all'|'dry-run', max_attempts?: number }.

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  {
    "type": "object",
    "properties": {
      "code": {
        "type": "string",
        "description": "Inline kernelCAD script source."
      },
      "file": {
        "type": "string",
        "description": "Path to a .kcad.ts script file."
      },
      "strategy": {
        "enum": [
          "apply-first",
          "try-all",
          "dry-run"
        ],
        "type": "string",
        "description": "'try-all' (default) walks candidates until one clears the diagnostic; 'apply-first' applies only the top candidate and reports what it did; 'dry-run' previews every candidate patch without evaluating."
      },
      "diagnostic": {
        "type": "string",
        "description": "Diagnostic id from why_did_this_fail's `targetDiagnosticId` / `candidates[].diagnosticId`, or 'first-error' (default) for the first error-severity diagnostic."
      },
      "max_attempts": {
        "type": "integer",
        "maximum": 10,
        "minimum": 1,
        "description": "Upper bound on candidates attempted (default 3). Ignored by apply-first and dry-run."
      }
    }
  }

  arguments 32 lines copy
• review_paint_peek_latest unknown never probed

  Return the newest brush-painted review packet from a Studio session. After sharing a /p/<slug> link, the user can open it in the browser and paint marks over the 3D viewport to give visual feedback. Call this tool with the `slug` from that link to see the strokes — screenshot + mask + struck part names plus an optional one-line note and intent tags (e.g. "too thick", "missing", "wrong angle") describing WHAT is wrong — and act on the feedback. The slug is the capability: no OAuth required when passing `slug`; private projects require the owner to be signed in. Omit `slug` to fetch your own latest packet from your signed-in account (requires OAuth). By default returns short-lived signed Storage URLs for the screenshot + mask + meta.json plus the struck part names — small and context-friendly. Pass `paths_only: false` to also base64-inline the PNGs for clients that cannot fetch the signed URLs over HTTP.

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  {
    "type": "object",
    "properties": {
      "slug": {
        "type": "string",
        "description": "Project slug from open_in_studio/get_project/a /p/<slug> link. When given, returns the latest brush packet painted on that project's page — works without OAuth; the slug is the capability. Omit to use your signed-in account's latest packet."
      },
      "paths_only": {
        "type": "boolean",
        "description": "Controls PNG delivery. Default (omitted or true): return only signed URLs + struck part names — the small, context-friendly response; fetch the bytes via the signed URLs. Set false to also base64-inline the screenshot + mask PNGs for clients that cannot fetch the URLs over HTTP (larger response)."
      },
      "freshness_sec": {
        "type": "integer",
        "minimum": 1,
        "description": "Maximum packet age in seconds. Default 1800 (30 min). Use a smaller value for \"what did I just paint\" or a larger one for \"earlier today\"."
      }
    },
    "additionalProperties": false
  }

  arguments 19 lines copy
• get_project unknown never probed

  Use this when you need to reopen a saved project or browse what the user has saved — it fetches a kernelCAD Studio project, or lists the signed-in user's saved projects. Pass `slug` (from a /p/<slug> link or a prior listing) to fetch that project's full .kcad source and metadata — then edit and open_in_studio with the same slug so the user's open tab updates live. Private projects require their owner's OAuth connection. OMIT `slug` to list the signed-in user's saved projects (most recently updated first); that listing mode requires the OAuth connection and does NOT paint. Paint phases: projectSaved/meshReady reflect fetch state; viewerPainted stays false until the widget acks display. Prefer open_in_studio (with code) to publish+paint — do NOT call get_model_mesh or get_latest_render for interactive paint.

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  {
    "type": "object",
    "properties": {
      "slug": {
        "type": "string",
        "minLength": 1,
        "description": "The project slug from a listing or a /p/<slug> Studio link. Omit to list the signed-in user's saved projects."
      }
    },
    "additionalProperties": false
  }

  arguments 11 lines copy
• lookup_diagnostics unknown never probed

  Use this when you need the kernelCAD 26-code diagnostic catalogue with hint templates. Tiny one-shot call; useful for an agent that wants to pre-populate retry strategies. Hints are also inline on every emitted diagnostic — this tool just gives you the canonical list up front.

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  {
    "type": "object",
    "properties": {}
  }

  arguments 4 lines copy
• mesh_summary unknown never probed

  Mesh a kernelCAD .kcad.ts source server-side and return a COMPACT geometry summary — overall bounds plus, per feature, its id, kind, triangle count, and bounding box. Use this to INSPECT a model's geometry without a viewer: confirm a part is the size/shape you expect, see how many triangles each feature contributes, or check that every feature produced geometry. This runs the full server-side OCCT pipeline (the same one the Studio renderer uses), so it evaluates modern sources (assembly, path, .material, …) that the legacy client worker cannot. INPUT: `source` (required) the .kcad.ts script text; `fileName` (optional) a label for diagnostics; `params` (optional) a map of parameter-name → number overrides applied before meshing (stateless slider recompute). OUTPUT: { ok, bounds, featureCount, features: [{ id, kind, triangleCount, bbox: { min:[x,y,z], max:[x,y,z] } }], failedFeatureIds, diagnostics }. `ok` is true when every feature meshed; `failedFeatureIds` lists features that failed to compile (and `ok` is then false). Raw vertex/index/normal arrays are NEVER returned — this is a summary only. To SEE the rendered model, call open_in_studio (includes PNG preview + viewer); use get_latest_render only for alternate views.

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  {
    "type": "object",
    "required": [
      "source"
    ],
    "properties": {
      "params": {
        "type": "object",
        "description": "Optional map of parameter-name → numeric value, applied as overrides before meshing (stateless slider recompute).",
        "additionalProperties": {
          "type": "number"
        }
      },
      "source": {
        "type": "string",
        "minLength": 1,
        "description": "The .kcad.ts script source to mesh."
      },
      "fileName": {
        "type": "string",
        "description": "Optional file-name label used in diagnostics (does not affect geometry)."
      }
    },
    "additionalProperties": false
  }

  arguments 25 lines copy
• set_param unknown never probed

  Use this when you need to edit a param() default value in a kernelCAD script. Returns the modified code as text plus diagnostics from re-evaluating the result. Caller persists the new code via standard file-write tools (this tool has no side effects).

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  {
    "type": "object",
    "required": [
      "code",
      "param_name",
      "new_value"
    ],
    "properties": {
      "code": {
        "type": "string",
        "description": "The .kcad.ts source code."
      },
      "new_value": {
        "oneOf": [
          {
            "type": "number"
          },
          {
            "type": "string"
          }
        ],
        "examples": [
          12.5,
          "width/2 + 3"
        ],
        "description": "The new default value. Either a number for a numeric param (e.g. 12.5), or a string expression evaluated in the script (e.g. \"width/2 + 3\")."
      },
      "param_name": {
        "type": "string",
        "description": "The string literal name of the param (first arg to param())."
      }
    }
  }

  arguments 33 lines copy
• add_feature unknown never probed

  Use this when you need to insert a new feature line into a script. Insert a new feature line into a kernelCAD script before the last top-level return statement. Returns the modified code as text plus diagnostics from re-evaluating the result. Side-effect-free. Primitives that accept faceLabels (box, cylinder, extrudeRect, extrudeCircle, extrudePolygon, extrudeRoundedRect) can receive `opts.faceLabels` in the inserted code — use `lookup_api` to see `featureKindFaceLabels` for the full value schema.

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  {
    "type": "object",
    "required": [
      "code",
      "feature_code"
    ],
    "properties": {
      "code": {
        "type": "string",
        "description": "The .kcad.ts source code."
      },
      "feature_code": {
        "type": "string",
        "description": "Single-statement source line to insert (e.g. `const hole = cylinder(5, 2).translate(10, 10, -1);`)."
      }
    }
  }

  arguments 17 lines copy
• add_surface unknown never probed

  Use this when you need an organic, freeform, or swept shape — a body shell, panel, fairing, ergonomic curve, lens, or sculpted form — authored as a NURBS Surface into the user's .kcad.ts, OR when you need to finish surfaces into a watertight solid or taper faces for moldability. One authoring/finishing path, selected by `kind`: - 'nurbs' — insert a nurbsSurface(...) / surfaceFromCurves(...) call. Pass either { controls, degree, weights?, knots?, periodic? } for direct construction, OR { section_sketch_ids } for skinning. Weights are honored: supply rational weights to build exact circles/cylinders/spheres/conics (the surface becomes rational); omit weights for a non-rational surface. - 'boundary' — insert a surfaceFromBoundary([c1,c2,c3,c4], opts?) call: one NURBS face through 4 boundary Curve3D refs (bottom, right, top, left in loop order; adjacent endpoints must coincide within 1e-6 mm) via OCCT BRepOffsetAPI_MakeFilling. - 'trim' — insert a `<surface>.trimTo(<by>)` or `<surface>.split(<by>)` call. Pass `surface_binding` (the Surface variable name), `by_binding` (the cutter Surface variable name; Shape/Curve3D cutters are deferred to a later slice), and `op: 'trim'` (keep the largest imprinted piece) or `op: 'split'` (return both halves as a `[Surface, Surface]` tuple). - 'sew' — insert a `sew([s0, s1, ...], opts?)` call to stitch N surfaces into a closed watertight solid via OCCT BRepBuilderAPI_Sewing. Pass `surface_bindings` (array of Surface variable names). Use after trim/boundary to close patches into a solid: trim → sew → solid pipeline. Optional `tolerance` (mm, default 1e-6) and `require_closed` (emits feature.surface-sew.open-shell if result is not watertight). - 'draft' — insert a `<shape>.draft(angleDeg, { face, neutralPlane?, pullDir? })` call to taper the selected face(s) for mold release. Pass `shape_binding`, `angle_deg` (0–90), and `face` (canonical name, label, or FaceQuery descriptor). Lowering emits feature.draft.failed on invalid geometry. The returned Surface produces no Shape until you chain .thicken(t) or .toShape() (do that via add_feature on the binding name). Returns the modified code + diagnostics. Each kind fails closed on its own missing required params.

  mcp-tool

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  {
    "type": "object",
    "required": [
      "kind",
      "code"
    ],
    "properties": {
      "op": {
        "enum": [
          "trim",
          "split"
        ],
        "type": "string",
        "description": "kind:'trim' — 'trim' discards the smaller half (calls .trimTo()); 'split' retains both halves (calls .split())."
      },
      "code": {
        "type": "string",
        "description": "Current .kcad.ts source."
      },
      "face": {
        "type": "string",
        "description": "kind:'draft' — face selector for the face(s) to taper. Accepts a canonical name (top/bottom/front/back/left/right), a user label declared via faceLabels, or a FaceQuery descriptor string."
      },
      "kind": {
        "enum": [
          "nurbs",
          "boundary",
          "trim",
          "sew",
          "draft"
        ],
        "type": "string",
        "description": "Which surface-construction or surface-finishing path to use: 'nurbs' | 'boundary' | 'trim' | 'sew' | 'draft'."
      },
      "knots": {
        "type": "object",
        "properties": {
          "u": {
            "type": "array",
            "items": {
              "type": "number"
            }
          },
          "v": {
            "type": "array",
            "items": {
              "type": "number"
            }
          }
        },
        "description": "kind:'nurbs' — optional explicit knot vectors; missing => clamped uniform inferred."
      },
      "degree": {
        "type": "object",
        "required": [
          "u",
          "v"
        ],
        "properties": {
          "u": {
            "type": "integer",
            "minimum": 1
          },
          "v": {
            "type": "integer",
            "minimum": 1
          }
        },
        "description": "kind:'nurbs' — degrees in U and V; each in [1, nU-1] / [1, nV-1]."
      },
      "weights": {
        "type": "array",
        "items": {
          "type": "array",
          "items": {
            "type": "number"
          }
        },
        "description": "kind:'nurbs' — optional rational weights, same grid shape as controls. Ignored in slice-1."
      },
      "controls": {
        "type": "array",
        "items": {
          "type": "array",
          "items": {
            "type": "array",
            "items": {
              "type": "number"
            }
          }
        },
        "description": "kind:'nurbs' — control-point grid for direct construction (controls[u][v] = [x, y, z], mm)."
      },
      "periodic": {
        "type": "object",
        "properties": {
          "u": {
            "type": "boolean"
          },
          "v": {
            "type": "boolean"
          }
        },
        "description": "kind:'nurbs' — optional periodic flags per parametric direction."
      },
      "pull_dir": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "maxItems": 3,
        "minItems": 3,
        "description": "kind:'draft' — demoulding direction as [x, y, z]. Defaults to the face normal at lower time."
      },
      "sampling": {
        "type": "integer",
        "minimum": 1,
        "description": "kind:'boundary' — OCCT NbPtsOnCur sampling parameter (default 15)."
      },
      "angle_deg": {
        "type": "number",
        "maximum": 90,
        "minimum": 0,
        "description": "kind:'draft' — draft angle in degrees [0, 90]. The face is tapered outward by this angle relative to the pull direction."
      },
      "tolerance": {
        "type": "number",
        "description": "kind:'sew' — edge-merging tolerance in mm (default 1e-6). Edges within this distance are merged."
      },
      "by_binding": {
        "type": "string",
        "description": "kind:'trim' — JS variable name of the cutter Surface (must be declared in source). Shape/Curve3D cutters are deferred."
      },
      "continuity": {
        "oneOf": [
          {
            "enum": [
              "C0",
              "C1",
              "C2"
            ],
            "type": "string"
          },
          {
            "type": "array",
            "items": {
              "enum": [
                "C0",
                "C1",
                "C2"
              ],
              "type": "string"
            },
            "maxItems": 4,
            "minItems": 4
          }
        ],
        "description": "kind:'boundary' — continuity grade applied to every edge ('C0' | 'C1' | 'C2'), or an array of 4 grades (one per edge, bottom/right/top/left order). Default 'C0'."
      },
      "binding_name": {
        "type": "string",
        "description": "JS const name for the new binding (kind:'nurbs' default surface_<N>; kind:'boundary' default _surface_<N>; kind:'trim' default _trimmed_<N>; kind:'sew' default _sewn_<N>; kind:'draft' default _drafted_<N>)."
      },
      "neutral_plane": {
        "type": "string",
        "description": "kind:'draft' — parting-line face (the plane where drafted faces remain fixed). Defaults to `face` if omitted."
      },
      "shape_binding": {
        "type": "string",
        "description": "kind:'draft' — JS variable name of the Shape to taper (must be declared in source)."
      },
      "curve_bindings": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "maxItems": 4,
        "minItems": 4,
        "description": "kind:'boundary' — tuple of 4 existing Curve3D variable names (bottom, right, top, left) declared earlier in the source."
      },
      "require_closed": {
        "type": "boolean",
        "description": "kind:'sew' — when true the lowerer emits feature.surface-sew.open-shell if the stitched result is not a watertight solid."
      },
      "surface_binding": {
        "type": "string",
        "description": "kind:'trim' — JS variable name of the Surface to trim/split (must be declared in source)."
      },
      "surface_bindings": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "minItems": 1,
        "description": "kind:'sew' — JS variable names of the surfaces to stitch into a solid (each must be declared in source)."
      },
      "section_sketch_ids": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "kind:'nurbs' — existing sketch FeatureIds (2 or more) to skin a surface through, in order."
      }
    }
  }

  arguments 205 lines copy
• add_curve unknown never probed

  Use this when you need a freeform/organic 3D curve — a body feature line, brow, spine rail, or G2 blend between panels — authored as a Curve3D into the user's .kcad.ts immediately before the last top-level return. One authoring path, selected by `kind`: - 'nurbs' — insert a `nurbsCurve(controlPoints, opts?)` declaration. Pass `controlPoints` as a Vec3[] (mm, at least 2 points). Optional NURBS knobs: `degree` (default 3), rational `weights`, explicit `knots`, `closed`. - 'hermite' — insert a `hermiteG2(a, b)` declaration: a quintic Hermite curve interpolating two endpoints with matching positions, tangents, and (optional) curvatures — bridges two curves with G2 continuity. Each endpoint is `{ point: Vec3, tangent: Vec3, curvature?: Vec3 }` in mm; tangent magnitude ~ chord length; curvature defaults to [0,0,0] (G1-only). The returned binding has type Curve3D (peer to Shape / Surface) — consume it via `add_variable_sweep` (spine input), `add_surface({ kind: 'boundary' })` (boundary curve), or downstream Curve3D-accepting features. Returns the modified code + diagnostics from re-evaluating. Side-effect-free. Each kind fails closed on its own missing required params.

  mcp-tool

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  {
    "type": "object",
    "allOf": [
      {
        "if": {
          "properties": {
            "kind": {
              "const": "nurbs"
            }
          }
        },
        "then": {
          "required": [
            "controlPoints"
          ]
        }
      },
      {
        "if": {
          "properties": {
            "kind": {
              "const": "hermite"
            }
          }
        },
        "then": {
          "required": [
            "a",
            "b"
          ]
        }
      }
    ],
    "required": [
      "kind",
      "code"
    ],
    "properties": {
      "a": {
        "type": "object",
        "required": [
          "point",
          "tangent"
        ],
        "properties": {
          "point": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 3,
            "minItems": 3,
            "description": "Endpoint position in mm."
          },
          "tangent": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 3,
            "minItems": 3,
            "description": "First derivative of the curve at this endpoint."
          },
          "curvature": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 3,
            "minItems": 3,
            "description": "Optional second derivative; defaults to [0, 0, 0] (G1-only)."
          }
        },
        "description": "kind:'hermite' — start endpoint."
      },
      "b": {
        "type": "object",
        "required": [
          "point",
          "tangent"
        ],
        "properties": {
          "point": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 3,
            "minItems": 3,
            "description": "Endpoint position in mm."
          },
          "tangent": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 3,
            "minItems": 3,
            "description": "First derivative of the curve at this endpoint."
          },
          "curvature": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 3,
            "minItems": 3,
            "description": "Optional second derivative; defaults to [0, 0, 0] (G1-only)."
          }
        },
        "description": "kind:'hermite' — end endpoint."
      },
      "code": {
        "type": "string",
        "description": "The .kcad.ts source code."
      },
      "kind": {
        "enum": [
          "nurbs",
          "hermite"
        ],
        "type": "string",
        "description": "Which curve-construction path to use."
      },
      "knots": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "description": "kind:'nurbs' — optional explicit knot vector; missing => clamped-uniform inferred."
      },
      "closed": {
        "type": "boolean",
        "description": "kind:'nurbs' — optional periodic/closed-curve flag."
      },
      "degree": {
        "type": "integer",
        "minimum": 1,
        "description": "kind:'nurbs' — curve degree; default 3 (cubic)."
      },
      "weights": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "description": "kind:'nurbs' — optional rational weights, one per control point (same length as controlPoints)."
      },
      "binding_name": {
        "type": "string",
        "description": "JS const name for the new Curve3D binding (default: _curve_<N>)."
      },
      "controlPoints": {
        "type": "array",
        "items": {
          "type": "array",
          "items": {
            "type": "number"
          },
          "maxItems": 3,
          "minItems": 3
        },
        "description": "kind:'nurbs' — control points as Vec3 triples in mm; at least 2 entries."
      }
    }
  }

  arguments 165 lines copy
• add_path_segment unknown never probed

  Use this when you need a freeform/organic 2D outline — an eyewear brow, ergonomic grip, sneaker midsole, or body silhouette — by appending a curved segment to an existing PathBuilder chain on the named `chain_anchor` variable. The call is injected at the END of the chain, immediately before any `.close()`. One segment kind, selected by `kind`: - 'spline' — `.spline(points, opts?)`: interpolates through every `points` waypoint (Vec2[] mm, >= 2 entries; points[0] must match current pen position). Optional `tension`, and `startTangent`/`endTangent` 2D direction vectors that constrain the first-derivative direction at the endpoints (magnitude normalised internally). Use for organic 2D outlines (eyewear brow, ergonomic handle, sneaker midsole). - 'nurbs' — `.nurbsSegment(controlPoints, opts?)`: explicit B-spline net (Vec2[] mm, >= degree+1 entries; controlPoints[0] must match pen; pen ends at controlPoints[N-1]). Optional `degree` (default 3), rational `weights` (strictly positive), explicit `knots` (length = controlPoints.length + degree + 1). - 'hermite' — `.hermiteG2(a, b)`: each endpoint `{ point: Vec2, tangent: Vec2, curvature?: Vec2 }` in mm (a.point must match pen; pen ends at b.point). `curvature` defaults to [0,0] (G1); pass matching curvatures for G2 blends. Tangent magnitude is the first derivative (~ chord length), NOT unit length. Returns the modified code + diagnostics from re-evaluating. Side-effect-free. Each kind fails closed on its own missing required params.

  mcp-tool

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  {
    "type": "object",
    "allOf": [
      {
        "if": {
          "properties": {
            "kind": {
              "const": "spline"
            }
          }
        },
        "then": {
          "required": [
            "points"
          ]
        }
      },
      {
        "if": {
          "properties": {
            "kind": {
              "const": "nurbs"
            }
          }
        },
        "then": {
          "required": [
            "controlPoints"
          ]
        }
      },
      {
        "if": {
          "properties": {
            "kind": {
              "const": "hermite"
            }
          }
        },
        "then": {
          "required": [
            "a",
            "b"
          ]
        }
      }
    ],
    "required": [
      "kind",
      "code",
      "chain_anchor"
    ],
    "properties": {
      "a": {
        "type": "object",
        "required": [
          "point",
          "tangent"
        ],
        "properties": {
          "point": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 2,
            "minItems": 2,
            "description": "Endpoint position in mm."
          },
          "tangent": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 2,
            "minItems": 2,
            "description": "First derivative (~ chord length), NOT unit length."
          },
          "curvature": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 2,
            "minItems": 2,
            "description": "Optional second derivative; defaults to [0, 0] (G1-only)."
          }
        },
        "description": "kind:'hermite' — start endpoint; point must match current pen position within 1e-6 mm."
      },
      "b": {
        "type": "object",
        "required": [
          "point",
          "tangent"
        ],
        "properties": {
          "point": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 2,
            "minItems": 2,
            "description": "Endpoint position in mm."
          },
          "tangent": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 2,
            "minItems": 2,
            "description": "First derivative (~ chord length), NOT unit length."
          },
          "curvature": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 2,
            "minItems": 2,
            "description": "Optional second derivative; defaults to [0, 0] (G1-only)."
          }
        },
        "description": "kind:'hermite' — end endpoint; pen ends at b.point."
      },
      "code": {
        "type": "string",
        "description": "The .kcad.ts source code."
      },
      "kind": {
        "enum": [
          "spline",
          "nurbs",
          "hermite"
        ],
        "type": "string",
        "description": "Which path-segment kind to append."
      },
      "knots": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "description": "kind:'nurbs' — optional explicit knot vector; length must equal controlPoints.length + degree + 1."
      },
      "degree": {
        "type": "integer",
        "minimum": 1,
        "description": "kind:'nurbs' — B-spline degree (default 3)."
      },
      "points": {
        "type": "array",
        "items": {
          "type": "array",
          "items": {
            "type": "number"
          },
          "maxItems": 2,
          "minItems": 2
        },
        "minItems": 2,
        "description": "kind:'spline' — waypoints as Vec2 pairs in mm; at least 2 entries; first must match current pen position."
      },
      "tension": {
        "type": "number",
        "description": "kind:'spline' — optional Catmull-Rom-style stiffness; forwarded to the underlying B-spline approximation."
      },
      "weights": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "description": "kind:'nurbs' — optional rational weights (one per control point; strictly positive)."
      },
      "endTangent": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "maxItems": 2,
        "minItems": 2,
        "description": "kind:'spline' — optional [x, y] direction vector at points[N-1]. Magnitude is normalised internally; direction matters."
      },
      "binding_name": {
        "type": "string",
        "description": "Reserved for future use; the segment injection mutates the chain anchor in place."
      },
      "chain_anchor": {
        "type": "string",
        "description": "JS identifier of an existing PathBuilder binding (e.g. `const brow = path().moveTo(0,0)`)."
      },
      "startTangent": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "maxItems": 2,
        "minItems": 2,
        "description": "kind:'spline' — optional [x, y] direction vector at points[0]. Magnitude is normalised internally; direction matters."
      },
      "controlPoints": {
        "type": "array",
        "items": {
          "type": "array",
          "items": {
            "type": "number"
          },
          "maxItems": 2,
          "minItems": 2
        },
        "description": "kind:'nurbs' — control-net vertices as Vec2 pairs in mm; at least degree+1 entries."
      }
    }
  }

  arguments 216 lines copy
• trace_from_image unknown never probed

  Use this when you need to trace features from a reference photo into waypoints. Trace pixel-space features from a reference photo into normalized [0..1] waypoints the agent can map to mm via a known scale anchor and feed to path().spline / path().nurbsSegment. Three backends are dispatched behind the scenes: `opencv` (deterministic; uniform-bg silhouette only), `vision-llm` (Claude vision; named points/cluttered backgrounds; caller-supplied ANTHROPIC_API_KEY), and `hybrid` (opencv silhouette + LLM-labeled named points). Default backend is `auto` — the tool picks based on the image's corner-color stddev. Accuracy honesty: opencv contour is geometrically exact; vision-LLM is typically 5–10% off on dense landmarks. Per-feature `confidence` is reported. Caller pays for any vision-LLM API spend via their own ANTHROPIC_API_KEY. Pair with the `kernelcad-trace-from-image` skill for the conversion-to-mm pipeline.

  mcp-tool

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  {
    "type": "object",
    "required": [
      "imageUrl"
    ],
    "properties": {
      "hint": {
        "type": "string",
        "description": "Optional free-text hint forwarded to vision-LLM backends (e.g. \"a pair of eyewear; trace the upper brow only\")."
      },
      "priors": {
        "type": "array",
        "items": {
          "type": "object",
          "required": [
            "id",
            "statement",
            "value",
            "confidence"
          ],
          "properties": {
            "id": {
              "type": "string"
            },
            "value": {},
            "statement": {
              "type": "string"
            },
            "confidence": {
              "type": "number",
              "maximum": 1,
              "minimum": 0
            }
          }
        },
        "description": "Caller-supplied category-norm defaults (e.g. wall thickness) recorded verbatim as `assumed` ledger facts."
      },
      "backend": {
        "enum": [
          "opencv",
          "vision-llm",
          "hybrid",
          "auto"
        ],
        "type": "string",
        "description": "Force a specific backend; default `auto` routes by corner-color stddev."
      },
      "features": {
        "type": "array",
        "items": {
          "type": "object",
          "required": [
            "label",
            "kind"
          ],
          "properties": {
            "kind": {
              "enum": [
                "silhouette",
                "curve",
                "point",
                "bbox"
              ],
              "type": "string",
              "description": "Geometric shape of the requested feature."
            },
            "label": {
              "type": "string",
              "description": "Caller-chosen identifier (echoed in the response)."
            },
            "region": {
              "type": "string",
              "description": "Optional free-text region hint forwarded to vision-LLM backends; ignored by opencv."
            }
          }
        },
        "description": "Features to trace. Defaults to a single { label: \"silhouette\", kind: \"silhouette\" } when omitted."
      },
      "imageUrl": {
        "type": "string",
        "description": "URL or path to the reference image. Supports file://, http(s)://, data:image/...;base64,..., or a bare filesystem path."
      },
      "validate": {
        "enum": [
          "warn",
          "error"
        ],
        "type": "string",
        "description": "Assumption-ledger strictness. `warn` (default) never blocks. `error` fails the call when any `missing` ledger fact (e.g. scale) is still open."
      },
      "scaleAnchor": {
        "type": "object",
        "required": [
          "pixelDistance",
          "realDistance",
          "unit"
        ],
        "properties": {
          "unit": {
            "enum": [
              "mm",
              "cm",
              "in"
            ],
            "type": "string"
          },
          "realDistance": {
            "type": "number",
            "description": "The same distance in real-world units."
          },
          "pixelDistance": {
            "type": "number",
            "description": "Distance in pixels between the two measured points."
          }
        },
        "description": "Pixel-to-real-world scale anchor: two measured points on the image. Absent -> the returned ledger's `scale` fact is `missing`."
      },
      "maxWaypointsPerFeature": {
        "type": "integer",
        "minimum": 2,
        "description": "Cap on waypoints per feature. Defaults to 12 (suitable for medium-inflection outlines)."
      }
    }
  }

  arguments 124 lines copy
• add_variable_sweep unknown never probed

  Use this when you need an organic swept solid whose cross-section changes along its length — a tapering body, horn, bottle, fairing, or duct — authored as a variable-section sweep along a spine. Insert a `variableSweep(spine, sections, opts?)` declaration into the user's .kcad.ts immediately before the last top-level return. The result is a Shape — chain `.translate(...)`, `.union(...)`, etc. via `add_feature`. `spine_binding` references an existing variable (Curve3D / Sketch / Vec3[]) in the source; each `sections[i].profile_binding` references an existing Sketch. Sections must be strictly increasing in `t` and span [0, 1]; first t=0, last t=1. Orientation is not exposed by this MCP tool until runtime orientation support is wired. Validates every binding exists in the source via regex before inserting (fast structured error vs capture-time stack). Returns the modified code + diagnostics. Side-effect-free.

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  {
    "type": "object",
    "required": [
      "code",
      "spine_binding",
      "sections"
    ],
    "properties": {
      "code": {
        "type": "string",
        "description": "The .kcad.ts source code."
      },
      "closed": {
        "type": "boolean",
        "description": "Optional closed-sweep flag."
      },
      "sections": {
        "type": "array",
        "items": {
          "type": "object",
          "required": [
            "t",
            "profile_binding"
          ],
          "properties": {
            "t": {
              "type": "number",
              "description": "Spine parameter in [0, 1]."
            },
            "profile_binding": {
              "type": "string",
              "description": "Existing Sketch variable name for this section."
            }
          }
        },
        "description": "Varying cross-sections along the spine; at least 2 entries, strictly increasing in `t`, first t=0, last t=1."
      },
      "continuity": {
        "enum": [
          "C0",
          "C1",
          "C2"
        ],
        "type": "string",
        "description": "Inter-section continuity; default 'C1'."
      },
      "binding_name": {
        "type": "string",
        "description": "JS const name for the new Shape binding (default: _sweep_<N>)."
      },
      "spine_binding": {
        "type": "string",
        "description": "Existing variable name for a Curve3D / Sketch / Vec3[] declared earlier in the source."
      }
    }
  }

  arguments 56 lines copy
• add_text unknown never probed

  Use this when you need to author text into a kernelCAD script before the last top-level return. One authoring path, selected by `mode`: - 'sketch' — insert a sketch.text(...) call. The emitted sketch is chainable: pair with subsequent .extrude(...) / cut(...) edits to land an engraved or raised text feature. - 'emboss' — insert a `<shape>.embossText({...})` chained call onto an existing Shape `target`. Use for engraved brand text on faces (Ray-Ban temple, CE mark, model number). `depth > 0` raises text out of the face; `depth < 0` engraves text into the face. Lowers via replicad drawText → sketchOnFace → extrude → fuse|cut. Default font is the runtime-bundled Liberation Sans. Side-effect-free; returns the modified code plus diagnostics from re-evaluating. Each mode fails closed on its own missing required params.

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  {
    "type": "object",
    "required": [
      "mode",
      "code"
    ],
    "properties": {
      "code": {
        "type": "string",
        "description": "The .kcad.ts source code."
      },
      "face": {
        "type": "string",
        "description": "mode:'emboss' — target face — canonical name ('top'/'bottom'/'left'/'right'/'front'/'back') or label."
      },
      "font": {
        "type": "string",
        "description": "mode:'sketch' — optional logical font name or .ttf file path; defaults to bundled Liberation Sans."
      },
      "mode": {
        "enum": [
          "sketch",
          "emboss"
        ],
        "type": "string",
        "description": "Which text-authoring path to use."
      },
      "size": {
        "type": "number",
        "description": "mode:'sketch'|'emboss' — glyph cap height in mm (positive finite)."
      },
      "align": {
        "enum": [
          "left",
          "center",
          "right"
        ],
        "type": "string",
        "description": "mode:'sketch' — horizontal alignment relative to position (default left); mode:'emboss' — relative to the UV anchor (default center)."
      },
      "depth": {
        "type": "number",
        "description": "mode:'emboss' — signed extrusion depth in mm: positive emboss out, negative engrave in. Must be non-zero."
      },
      "bindAs": {
        "type": "string",
        "description": "mode:'sketch' — emits `const <bindAs> = sketch.text(...)`; mode:'emboss' — emits `const <bindAs> = <target>.embossText(...);`."
      },
      "target": {
        "type": "string",
        "description": "mode:'emboss' — variable name of the Shape to chain onto (inserted verbatim)."
      },
      "anchorU": {
        "type": "number",
        "description": "mode:'emboss' — U anchor in [0, 1] face-local (0=umin, 0.5=centre, 1=umax). Default 0.5."
      },
      "anchorV": {
        "type": "number",
        "description": "mode:'emboss' — V anchor in [0, 1] face-local. Default 0.5."
      },
      "content": {
        "type": "string",
        "description": "mode:'sketch' — text content (UTF-8, non-empty, non-whitespace)."
      },
      "position": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "maxItems": 2,
        "minItems": 2,
        "description": "mode:'sketch' — [x, y] anchor in mm. Default [0, 0]."
      },
      "rotation": {
        "type": "number",
        "description": "mode:'sketch' — CCW rotation in degrees around position (default 0); mode:'emboss' — CCW rotation in the face tangent plane (default 0)."
      },
      "scaleMode": {
        "enum": [
          "original",
          "native",
          "bounds"
        ],
        "type": "string",
        "description": "mode:'emboss' — Drawing.sketchOnFace scaling mode. Default original."
      },
      "fontFamily": {
        "type": "string",
        "description": "mode:'emboss' — optional logical font name or .ttf file path; defaults to bundled Liberation Sans."
      },
      "textContent": {
        "type": "string",
        "description": "mode:'emboss' — text content (UTF-8, non-empty, non-whitespace)."
      }
    }
  }

  arguments 96 lines copy
• project_curve unknown never probed

  Use this when you need to wrap a 2D closed curve onto a 3D face. Insert a `<shape>.projectCurve({ source, face, scaleMode? })` chained call into a kernelCAD script. The `source` is the structured `{ kind: "sketchCommands", commands: [...] }` wire format the runtime API accepts. Wraps the curve onto the face along the face normal; pair with `.extrude(d)` / `.cut(...)` for raised or engraved logos on curved bodies. Open-wire projection (`asEdge: true`) is not implemented and is rejected at edit time. Side-effect-free; returns modified code plus diagnostics.

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  {
    "type": "object",
    "required": [
      "code",
      "target",
      "commands",
      "face"
    ],
    "properties": {
      "code": {
        "type": "string",
        "description": "The .kcad.ts source code."
      },
      "face": {
        "type": "string",
        "description": "Target face — canonical name or label."
      },
      "asEdge": {
        "type": "boolean",
        "description": "Open-wire (edge) projection. NOT IMPLEMENTED — rejected at edit time. Use a closed-curve projection (omit asEdge)."
      },
      "bindAs": {
        "type": "string",
        "description": "Optional local variable name; emits `const <bindAs> = <target>.projectCurve(...);`."
      },
      "target": {
        "type": "string",
        "description": "Variable name of the Shape to chain onto."
      },
      "commands": {
        "type": "array",
        "items": {
          "type": "object",
          "required": [
            "kind"
          ],
          "properties": {
            "x": {
              "type": "number"
            },
            "y": {
              "type": "number"
            },
            "kind": {
              "enum": [
                "moveTo",
                "lineTo",
                "close"
              ],
              "type": "string"
            }
          }
        },
        "description": "Closed 2D path to wrap onto the face, as plain-number commands. Must start with a `moveTo` and end with a `close` (e.g. [{kind:\"moveTo\",x:0,y:0},{kind:\"lineTo\",x:2,y:0},{kind:\"lineTo\",x:2,y:2},{kind:\"close\"}])."
      },
      "scaleMode": {
        "enum": [
          "original",
          "native",
          "bounds"
        ],
        "type": "string",
        "description": "Drawing.sketchOnFace scaling mode. Default original."
      }
    }
  }

  arguments 66 lines copy
• add_pattern_feature unknown never probed

  Use this when you need to repeat a feature in a pattern. Insert a Shape.patternLinear / .patternCircular / .patternGrid call into a kernelCAD script before the last top-level return. Pass structured args (kind + the matching spec object). Returns the modified code plus diagnostics from re-evaluating. Side-effect-free. The pattern feature is a single editable unit; pattern-instance face refs resolve via `<sourceId>_pattern_<i>` on the pattern feature's lineage. Geometric note: pattern is implemented as cumulative boolean union of transformed source copies — additive features (boxes, ribs, fins, spokes) pattern cleanly; patterning a subtractive feature (hole, cutout) only preserves the per-instance void when adjacent bodies are disjoint.

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  {
    "type": "object",
    "allOf": [
      {
        "if": {
          "properties": {
            "kind": {
              "const": "linear"
            }
          }
        },
        "then": {
          "required": [
            "linear"
          ]
        }
      },
      {
        "if": {
          "properties": {
            "kind": {
              "const": "circular"
            }
          }
        },
        "then": {
          "required": [
            "circular"
          ]
        }
      },
      {
        "if": {
          "properties": {
            "kind": {
              "const": "grid"
            }
          }
        },
        "then": {
          "required": [
            "grid"
          ]
        }
      }
    ],
    "required": [
      "code",
      "target",
      "kind"
    ],
    "properties": {
      "code": {
        "type": "string",
        "description": "The .kcad.ts source code."
      },
      "grid": {
        "type": "object",
        "required": [
          "x",
          "y"
        ],
        "properties": {
          "x": {
            "type": "object",
            "required": [
              "count",
              "direction",
              "spacing"
            ],
            "properties": {
              "count": {
                "type": "integer",
                "minimum": 2
              },
              "spacing": {
                "type": "number"
              },
              "direction": {
                "type": "array",
                "items": {
                  "type": "number"
                },
                "maxItems": 3,
                "minItems": 3
              }
            },
            "description": "First grid axis."
          },
          "y": {
            "type": "object",
            "required": [
              "count",
              "direction",
              "spacing"
            ],
            "properties": {
              "count": {
                "type": "integer",
                "minimum": 2
              },
              "spacing": {
                "type": "number"
              },
              "direction": {
                "type": "array",
                "items": {
                  "type": "number"
                },
                "maxItems": 3,
                "minItems": 3
              }
            },
            "description": "Second grid axis."
          }
        },
        "description": "Required when kind=grid."
      },
      "kind": {
        "enum": [
          "linear",
          "circular",
          "grid"
        ],
        "type": "string"
      },
      "linear": {
        "type": "object",
        "required": [
          "count",
          "direction",
          "spacing"
        ],
        "properties": {
          "count": {
            "type": "integer",
            "minimum": 2
          },
          "spacing": {
            "type": "number"
          },
          "direction": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 3,
            "minItems": 3
          }
        },
        "description": "Required when kind=linear."
      },
      "target": {
        "type": "string",
        "description": "Variable name of the Shape to pattern (inserted verbatim as the LHS receiver)."
      },
      "circular": {
        "type": "object",
        "required": [
          "count",
          "axis"
        ],
        "properties": {
          "axis": {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 3,
            "minItems": 3
          },
          "count": {
            "type": "integer",
            "minimum": 2
          },
          "angleDeg": {
            "type": "number",
            "description": "Optional; defaults to 360."
          }
        },
        "description": "Required when kind=circular."
      },
      "assign_to": {
        "type": "string",
        "description": "Optional const-binding name; emits `const <assign_to> = <target>.patternX(...);`. Omit for statement form."
      }
    }
  }

  arguments 188 lines copy
• remove_feature unknown never probed

  Use this when you need to remove a feature line from a script. Remove a single line from a kernelCAD script identified by a substring match. Returns the modified code plus diagnostics from re-evaluating. Refuses to remove the line containing the return statement. Side-effect-free.

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  {
    "type": "object",
    "required": [
      "code",
      "match"
    ],
    "properties": {
      "code": {
        "type": "string",
        "description": "The .kcad.ts source code."
      },
      "match": {
        "type": "string",
        "description": "A substring that uniquely identifies the line to remove (e.g. `const hole = cylinder(5,`)."
      }
    }
  }

  arguments 17 lines copy
• query unknown never probed

  Use this when you need to resolve or inspect topology against a script's lowered geometry. Selected by `mode` (default 'evaluate'): - 'evaluate' — inspect a Query (@kc[...] ref, @kcq[...] DSL, or { ast }); returns matched entities. Pass expect:'unique' to assert exactly-one. - 'resolve' — resolve a single @kc[...] / @kcq[...] ref to one entity ({ ref }). - 'lineage' — walk the HistoryMap for a named face ref ({ feature_id, ref }). All params except `mode` are forwarded verbatim.

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  {
    "type": "object",
    "properties": {
      "ref": {
        "type": "string",
        "description": "mode:'resolve'|'lineage' — topology ref string."
      },
      "code": {
        "type": "string",
        "description": "Inline kernelCAD script source."
      },
      "file": {
        "type": "string",
        "description": "Path to a .kcad.ts script file."
      },
      "mode": {
        "enum": [
          "evaluate",
          "resolve",
          "lineage"
        ],
        "type": "string",
        "description": "Resolution mode (default 'evaluate')."
      },
      "query": {
        "description": "mode:'evaluate' — Query input: @kc[...] / @kcq[...] string or { ast } object."
      },
      "expect": {
        "enum": [
          "any",
          "unique"
        ],
        "type": "string",
        "description": "mode:'evaluate' — 'unique' asserts exactly-one."
      },
      "feature_id": {
        "type": "string",
        "description": "Optional FeatureId; defaults to the last lowered shape (use \"auto\" for lineage)."
      }
    }
  }

  arguments 41 lines copy
• lookup_api unknown never probed

  Use this when you need to list the kernelCAD script-runtime surface: global functions (box, path, selectEdges, helix, etc), Shape methods (fillet, sweep, lower, etc), Sketch methods (extrude, revolve, sweep), PathBuilder methods, EdgeQuery/FaceQuery key sets, and featureKindFaceLabels (which globals accept opts.faceLabels and valid value shapes). Use this to discover what is callable from a .kcad.ts script. Call this BEFORE concluding kernelCAD lacks a capability — its NURBS freeform surfacing (loft, sweep, boundary-fill, G2 blend) is easy to miss from tool names alone.

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  {
    "type": "object",
    "properties": {}
  }

  arguments 4 lines copy
• export unknown never probed

  Use this when you need to export geometry to a file. One exporter, selected by `target`: - target:'model' — export the script geometry to one file. Pass { file | code }, a required { output_path }, and { format }. Supported formats: stl (binary STL mesh), step (BREP CAD interchange), dxf (planar laser/waterjet profile from a Region or planar face), 3mf (slicer-friendly mesh with per-part colors), glb (web-viewer / AR with PBR materials), svg-drawing (third-angle engineering-drawing sheet: front/top/left + isometric views, hidden edges dashed, tangent edges thin, overall bounding-box dimensions, title block; assemblies are drawn with inter-part occlusion; pass options.annotations to dimension specific features instead of the bounding box; pass options.exploded { factor, mode } to explode the isometric cell, options.balloons to number parts from the BOM, and options.partsList for an item/name/qty/material table above the title block). overall bounding-box dimensions, title block; assemblies are drawn with inter-part occlusion; pass options.annotations to dimension specific features instead of the bounding box, options.autoAnnotate to derive datums A/B/C, grouped hole callouts with position tolerances, hole positions, overall size, radius and chamfer callouts, flatness and an ISO 2768 note from the geometry (the result carries drawing_report with placed / overlapped counts), and options.sections for real section views on any cutting plane). Robot descriptions: urdf (tree-topology robot description), srdf (motion-planning semantics layered over the URDF), sdf-gazebo (SDFormat 1.10 with native ball joints, closed loops, and solved per-link poses), usd-isaac (ASCII USD physics stage: PhysicsArticulationRootAPI root, one rigid body per link at its solved pose with mass / centre of mass / principal inertia, PhysicsFixedJoint/PhysicsRevoluteJoint/PhysicsPrismaticJoint per mate with token axis, two-sided joint frames and limits, UsdPreviewSurface materials from the part appearance, and joint drives only when declared in options.drives { <mate>: { stiffness, damping, maxForce?, targetPosition? } }; options.collisionApproximation is convexHull | convexDecomposition; planar/cylindrical/pin_slot/ball mates fail closed with export.usd.joint-unsupported). bom-csv / bom-json (bill of materials over assembly.model()/solvedModel(): one row per distinct part — grouped by geometry/catalog identity, not name — with real instance quantity, kind, material, density, mass, bbox, process hint, and catalog provenance for purchased parts; same numbers as inspect({ of: 'bom' })). urdf and sdf-gazebo also write one meshes/<part>.stl per link, and usd-isaac one meshes/<part>.usda mesh layer per link, next to output_path (reported in mesh_files) — ship the whole directory to the consumer. STL exports run a watertight verify by default; failures return ok: false with export.mesh.not-watertight (open-edge count + up to 5 crack-cluster locations) but the file is still written so the broken mesh can be inspected. Optional { feature_id } selects which feature to export (default: last). Optional { options } carries per-format options bag (see the kernelcad-mcp skill for the per-format keys: dxf layers/tolerance/unit, 3mf printUnit/embedSource, glb axis/draco). - target:'part' — export solved-assembly parts as individual binary STL files in their modeled (world-frame) positions. Pass { file | code }, plus { part, output_path } for one part or { output_dir } for all parts (files land at <output_dir>/<part>.stl). A watertight verify runs on every exported mesh by default and fails the call with export.mesh.not-watertight; unknown part names fail with export.part.not-found listing the valid names. Pass { no_verify: true } to skip the watertight gate. All params except `target` are forwarded verbatim; each target fails closed on its own missing required params.

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  {
    "type": "object",
    "required": [
      "target"
    ],
    "properties": {
      "code": {
        "type": "string",
        "description": "Inline kernelCAD script source."
      },
      "file": {
        "type": "string",
        "description": "Path to a .kcad.ts script file."
      },
      "part": {
        "type": "string",
        "description": "target:'part' — part name for single-part export, or 'all'."
      },
      "format": {
        "enum": [
          "stl",
          "step",
          "dxf",
          "3mf",
          "glb",
          "svg-drawing",
          "urdf",
          "srdf",
          "sdf-gazebo",
          "usd-isaac",
          "bom-csv",
          "bom-json"
        ],
        "type": "string",
        "description": "target:'model' — output file format (required for that target)."
      },
      "target": {
        "enum": [
          "model",
          "part"
        ],
        "type": "string",
        "description": "Which exporter to run: 'model' (whole-script geometry to one file) or 'part' (per-part STLs from a solved assembly)."
      },
      "options": {
        "type": "object",
        "description": "target:'model' — optional per-format options bag. Discriminator options.format must equal top-level format. dxf: { layers?, unit?: \"mm\"|\"cm\"|\"in\", tolerance? }. 3mf: { printUnit?: \"mm\"|\"cm\"|\"in\", embedSource? }. glb: { axis?: \"y-up\"|\"z-up\", draco?: false }. svg-drawing: { sheet?: \"a4\"|\"a3\", modelName?, date?, annotations?, exploded?: { factor, mode? }, balloons?, partsList?, sections?, autoAnnotate? }. svg-drawing annotations is an array of authored dimensions/notes, each { kind: \"linear\"|\"radius\"|\"diameter\"|\"angular\"|\"note\", view?: \"front\"|\"top\"|\"left\"|\"iso\", text?, offset? } plus kind-specific geometry: linear { from, to }, radius/diameter { edge: EdgeQuery }, angular { from: EdgeQuery, to: EdgeQuery }, note { at, text }. from/to/at anchors are an [x,y,z] model point, { edge: EdgeQuery } or { face: FaceQuery }. Supplying any annotation REPLACES the automatic bounding-box dimensions; an annotation whose query resolves to zero or multiple matches fails the export rather than being dropped. svg-drawing sections is an array of { plane: \"xy\"|\"xz\"|\"yz\"|{ origin, normal }, label } (any non-zero normal). svg-drawing autoAnnotate is true or { tolerance?: \"ISO2768-f\"|\"ISO2768-m\"|\"ISO2768-c\", datums?: \"auto\"|[{ label, face: FaceQuery }], include?: [\"datums\"|\"flatness\"|\"holes\"|\"hole-positions\"|\"overall\"|\"fillets\"|\"chamfers\"|\"general-tolerance\"] }; datums and tolerances declared in the script with shape.datum() / shape.tolerance() override the automatic ones."
      },
      "no_verify": {
        "type": "boolean",
        "default": false,
        "description": "Skip the STL watertight verify gate."
      },
      "feature_id": {
        "type": "string",
        "description": "target:'model' — optional FeatureId to export; defaults to last."
      },
      "output_dir": {
        "type": "string",
        "description": "target:'part' — destination directory (all-parts mode); files are <dir>/<part>.stl."
      },
      "output_path": {
        "type": "string",
        "description": "Destination path. target:'model' — the export file (required). target:'part' — single-part .stl path."
      }
    }
  }

  arguments 67 lines copy
• lookup_cookbook unknown never probed

  Use this when you need a canonical pattern snippet for a CAD task. Search the kernelCAD cookbook for canonical pattern snippets. Returns top-k snippets matching the natural-language query, ranked by BM25 over title/tags/keywords/trigger. Use when you need a canonical pattern for fillet-after-subtract, non-overlapping booleans, sketch-to-extrude flows, etc. Returns empty if no snippet scores above the relevance floor — proceed without cookbook help in that case.

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  {
    "type": "object",
    "required": [
      "query"
    ],
    "properties": {
      "k": {
        "type": "number",
        "default": 3,
        "description": "Max snippets to return. Default 3, max 5."
      },
      "query": {
        "type": "string",
        "description": "Natural-language description of what you want to do (e.g. \"round the rim of a hole\", \"build an L-bracket\")."
      }
    }
  }

  arguments 17 lines copy
• find_part unknown never probed

  Use this when you need to find a part in the catalog. Discover bundled (and optionally remote) part-catalog records by fuzzy query and faceted filters. Tokens AND-combine; cross-facet filters AND-combine. Pass partsBaseUrl (or set KERNELCAD_PARTS_BASE_URL) to enable the remote tier; otherwise results are bundled-only.

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  {
    "type": "object",
    "properties": {
      "tag": {
        "type": "string"
      },
      "limit": {
        "type": "number"
      },
      "query": {
        "type": "string"
      },
      "family": {
        "type": "string"
      },
      "source": {
        "enum": [
          "local",
          "remote",
          "auto"
        ],
        "type": "string"
      },
      "category": {
        "type": "string"
      },
      "standard": {
        "type": "string"
      },
      "partsBaseUrl": {
        "type": "string",
        "description": "Opt-in remote endpoint; no default value ships with kernelCAD."
      }
    }
  }

  arguments 35 lines copy
• fetch_part unknown never probed

  Use this when you need to download a catalog part as a STEP file. Resolve an id (or single-match query) to a part record and write its STEP file to the local cache. Bundled ids resolve offline; non-bundled ids require partsBaseUrl (or KERNELCAD_PARTS_BASE_URL). Returns the cache path plus a sha256 fingerprint.

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  {
    "type": "object",
    "properties": {
      "id": {
        "type": "string"
      },
      "query": {
        "type": "string"
      },
      "family": {
        "type": "string"
      },
      "category": {
        "type": "string"
      },
      "standard": {
        "type": "string"
      },
      "partsBaseUrl": {
        "type": "string",
        "description": "Opt-in remote endpoint; no default value ships with kernelCAD."
      }
    }
  }

  arguments 24 lines copy
• solve_sketch unknown never probed

  Use this when you need to solve a 2D sketch constraint set. Solve a 2D sketch constraint set. Side-effect-free: pass { entities, constraints } and receive solved entities plus the original constraints. Entities are POINT, LINE, and CIRCLE records; constraints use the kernelCAD constraint vocabulary.

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  {
    "type": "object",
    "required": [
      "entities",
      "constraints"
    ],
    "properties": {
      "entities": {
        "type": "array",
        "items": {
          "oneOf": [
            {
              "type": "object",
              "required": [
                "id",
                "type",
                "x",
                "y"
              ],
              "properties": {
                "x": {
                  "type": "number"
                },
                "y": {
                  "type": "number"
                },
                "id": {
                  "type": "string"
                },
                "type": {
                  "enum": [
                    "POINT"
                  ],
                  "type": "string"
                },
                "fixed": {
                  "type": "boolean",
                  "description": "If true, the solver won't move this point."
                }
              },
              "description": "POINT — a 2D point."
            },
            {
              "type": "object",
              "required": [
                "id",
                "type",
                "p1",
                "p2"
              ],
              "properties": {
                "id": {
                  "type": "string"
                },
                "p1": {
                  "type": "string"
                },
                "p2": {
                  "type": "string"
                },
                "type": {
                  "enum": [
                    "LINE"
                  ],
                  "type": "string"
                }
              },
              "description": "LINE — references two point ids."
            },
            {
              "type": "object",
              "required": [
                "id",
                "type",
                "center",
                "radius"
              ],
              "properties": {
                "id": {
                  "type": "string"
                },
                "type": {
                  "enum": [
                    "CIRCLE"
                  ],
                  "type": "string"
                },
                "center": {
                  "type": "string"
                },
                "radius": {
                  "type": "number"
                }
              },
              "description": "CIRCLE — references a center point id."
            }
          ]
        },
        "description": "Sketch entities to solve. Lines reference point ids; circles reference a center point id."
      },
      "constraints": {
        "type": "array",
        "items": {
          "type": "object",
          "required": [
            "id",
            "type",
            "entities"
          ],
          "properties": {
            "id": {
              "type": "string"
            },
            "type": {
              "enum": [
                "COINCIDENT",
                "DISTANCE",
                "HORIZONTAL",
                "VERTICAL",
                "PARALLEL",
                "PERPENDICULAR",
                "EQUAL_LENGTH",
                "TANGENT",
                "RADIUS",
                "ANGLE",
                "CONCENTRIC",
                "SYMMETRIC"
              ],
              "type": "string"
            },
            "value": {
              "type": "number",
              "description": "Required for DISTANCE, RADIUS, and ANGLE."
            },
            "entities": {
              "type": "array",
              "items": {
                "type": "string"
              },
              "description": "Ids of the entities the constraint relates."
            }
          }
        },
        "description": "Constraints to apply to the entities."
      }
    }
  }

  arguments 147 lines copy
• add_constraint unknown never probed

  Use this when you need to add a sketch constraint to a list. Append one validated sketch constraint to a constraint list. Side-effect-free: pass { constraints, constraint } and receive the updated list.

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  {
    "type": "object",
    "required": [
      "constraint"
    ],
    "properties": {
      "constraint": {
        "type": "object",
        "required": [
          "id",
          "type",
          "entities"
        ],
        "properties": {
          "id": {
            "type": "string"
          },
          "type": {
            "enum": [
              "COINCIDENT",
              "DISTANCE",
              "HORIZONTAL",
              "VERTICAL",
              "PARALLEL",
              "PERPENDICULAR",
              "EQUAL_LENGTH",
              "TANGENT",
              "RADIUS",
              "ANGLE",
              "CONCENTRIC",
              "SYMMETRIC"
            ],
            "type": "string"
          },
          "value": {
            "type": "number",
            "description": "Required for DISTANCE, RADIUS, and ANGLE."
          },
          "entities": {
            "type": "array",
            "items": {
              "type": "string"
            },
            "description": "Ids of the entities the constraint relates."
          }
        },
        "description": "The constraint to append."
      },
      "constraints": {
        "type": "array",
        "items": {
          "type": "object",
          "required": [
            "id",
            "type",
            "entities"
          ],
          "properties": {
            "id": {
              "type": "string"
            },
            "type": {
              "enum": [
                "COINCIDENT",
                "DISTANCE",
                "HORIZONTAL",
                "VERTICAL",
                "PARALLEL",
                "PERPENDICULAR",
                "EQUAL_LENGTH",
                "TANGENT",
                "RADIUS",
                "ANGLE",
                "CONCENTRIC",
                "SYMMETRIC"
              ],
              "type": "string"
            },
            "value": {
              "type": "number"
            },
            "entities": {
              "type": "array",
              "items": {
                "type": "string"
              }
            }
          }
        },
        "description": "Existing constraint list to append to (omit for an empty list)."
      }
    }
  }

  arguments 93 lines copy
• add_part unknown never probed

  Use this when you need to add a part to an assembly. Durably insert `const <binding> = <assembly>.part(partName, shapeExpression, opts?)` before the final top-level return in a kernelCAD source string. Returns modified source plus diagnostics from re-evaluating it. Side-effect-free: caller persists the returned source.

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  {
    "type": "object",
    "required": [
      "code",
      "assembly_binding",
      "part_name",
      "shape_expression"
    ],
    "properties": {
      "at": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "description": "Optional [x, y, z] assembly placement."
      },
      "code": {
        "type": "string",
        "description": "The .kcad.ts source code."
      },
      "part_name": {
        "type": "string",
        "description": "Assembly-unique part name."
      },
      "binding_name": {
        "type": "string",
        "description": "Optional JS const name for the returned AssemblyPartRef. Defaults to a part-name-derived identifier."
      },
      "assembly_binding": {
        "type": "string",
        "description": "JS identifier bound to assembly(...), e.g. \"arm\"."
      },
      "shape_expression": {
        "type": "string",
        "description": "JS expression for the Shape to pass to assembly.part, inserted verbatim."
      }
    }
  }

  arguments 38 lines copy
• add_connector unknown never probed

  Use this when you need to add a mate connector to a part. Durably insert `<partBinding>.connector(name, { type, origin, axis?, normal? })` before the final top-level return. Use the part binding returned by add_part. Returns modified source plus diagnostics from re-evaluation. Side-effect-free.

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  {
    "type": "object",
    "required": [
      "code",
      "part_binding",
      "name",
      "type",
      "origin"
    ],
    "properties": {
      "axis": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "description": "Optional [x, y, z] axis."
      },
      "code": {
        "type": "string",
        "description": "The .kcad.ts source code."
      },
      "name": {
        "type": "string",
        "description": "Connector name unique within the part."
      },
      "type": {
        "enum": [
          "frame",
          "axis",
          "planar",
          "ball"
        ],
        "type": "string"
      },
      "normal": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "description": "Optional [x, y, z] normal."
      },
      "origin": {
        "oneOf": [
          {
            "type": "array",
            "items": {
              "type": "number"
            },
            "maxItems": 3,
            "minItems": 3,
            "description": "[x, y, z] shorthand."
          },
          {
            "type": "object",
            "required": [
              "kind",
              "value"
            ],
            "properties": {
              "kind": {
                "enum": [
                  "vec3"
                ],
                "type": "string"
              },
              "value": {
                "type": "array",
                "items": {
                  "type": "number"
                },
                "maxItems": 3,
                "minItems": 3
              }
            },
            "description": "Explicit numeric origin."
          },
          {
            "type": "object",
            "required": [
              "kind",
              "query"
            ],
            "properties": {
              "kind": {
                "enum": [
                  "topology"
                ],
                "type": "string"
              },
              "query": {
                "type": "object",
                "required": [
                  "kind",
                  "name"
                ],
                "properties": {
                  "kind": {
                    "enum": [
                      "face-center",
                      "face-normal",
                      "vertex",
                      "edge-axis"
                    ],
                    "type": "string"
                  },
                  "name": {
                    "type": "string"
                  }
                }
              }
            },
            "description": "Topology-derived origin."
          }
        ],
        "description": "Origin as [x, y, z] shorthand, or a structured ConnectorOrigin."
      },
      "part_binding": {
        "type": "string",
        "description": "JS identifier bound to an AssemblyPartRef, e.g. \"basePart\"."
      }
    }
  }

  arguments 122 lines copy
• add_mate unknown never probed

  Use this when you need to author a mate-graph relationship into the source, selected by `relation` (default 'mate'): - 'mate' — a typed mate between two connectors ({ name, a, b, type, pose?, limitsDeg?, limitsMm? }). - 'coupling' — couple a driven mate to a source mate by ratio ({ driven, source, ratio, offset? }). - 'transmission' — a physical drive path across mates ({ name, kind, sourceMate, drivenMates, path, ... }). All durably edit source and need { code, assembly_binding }. Params other than `relation` are forwarded verbatim; each relation fails closed on its own missing required params.

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  {
    "type": "object",
    "allOf": [
      {
        "if": {
          "anyOf": [
            {
              "not": {
                "required": [
                  "relation"
                ]
              }
            },
            {
              "required": [
                "relation"
              ],
              "properties": {
                "relation": {
                  "const": "mate"
                }
              }
            }
          ]
        },
        "then": {
          "required": [
            "name",
            "a",
            "b",
            "type"
          ]
        }
      },
      {
        "if": {
          "required": [
            "relation"
          ],
          "properties": {
            "relation": {
              "const": "coupling"
            }
          }
        },
        "then": {
          "required": [
            "driven",
            "source",
            "ratio"
          ]
        }
      },
      {
        "if": {
          "required": [
            "relation"
          ],
          "properties": {
            "relation": {
              "const": "transmission"
            }
          }
        },
        "then": {
          "required": [
            "name",
            "kind",
            "sourceMate",
            "drivenMates",
            "path"
          ]
        }
      }
    ],
    "required": [
      "code",
      "assembly_binding"
    ],
    "properties": {
      "a": {
        "type": "string",
        "description": "relation:'mate' — connector ref \"<partName>.<connectorName>\"."
      },
      "b": {
        "type": "string",
        "description": "relation:'mate' — connector ref \"<partName>.<connectorName>\"."
      },
      "code": {
        "type": "string",
        "description": "The .kcad.ts source code."
      },
      "kind": {
        "enum": [
          "direct-horn",
          "link-rod",
          "four-bar",
          "gear-pair",
          "belt",
          "tendon"
        ],
        "type": "string",
        "description": "relation:'transmission' — transmission kind."
      },
      "name": {
        "type": "string",
        "description": "relation:'mate'|'transmission' — name unique within the assembly."
      },
      "path": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "relation:'transmission' — drive path."
      },
      "pose": {
        "description": "relation:'mate' — optional mate pose."
      },
      "type": {
        "enum": [
          "fastened",
          "revolute",
          "prismatic",
          "cylindrical",
          "planar",
          "ball",
          "pin_slot"
        ],
        "type": "string",
        "description": "relation:'mate' — mate type."
      },
      "input": {
        "type": "string",
        "description": "relation:'transmission' — optional input."
      },
      "notes": {
        "type": "string",
        "description": "relation:'transmission' — optional notes."
      },
      "ratio": {
        "type": "number",
        "description": "relation:'coupling' — driven pose = source pose * ratio + offset."
      },
      "driven": {
        "type": "string",
        "description": "relation:'coupling' — driven mate name."
      },
      "offset": {
        "type": "number",
        "description": "relation:'coupling' — optional pose offset."
      },
      "output": {
        "type": "string",
        "description": "relation:'transmission' — optional output."
      },
      "source": {
        "type": "string",
        "description": "relation:'coupling' — source mate name."
      },
      "actuator": {
        "type": "string",
        "description": "relation:'transmission' — optional actuator."
      },
      "limitsMm": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "description": "relation:'mate' — optional [minMm, maxMm]."
      },
      "relation": {
        "enum": [
          "mate",
          "coupling",
          "transmission"
        ],
        "type": "string",
        "description": "Which relationship to author (default 'mate')."
      },
      "limitsDeg": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "description": "relation:'mate' — optional [minDeg, maxDeg]."
      },
      "sourceMate": {
        "type": "string",
        "description": "relation:'transmission' — source mate name."
      },
      "drivenMates": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "relation:'transmission' — driven mate names."
      },
      "assembly_binding": {
        "type": "string",
        "description": "JS identifier bound to assembly(...)."
      }
    }
  }

  arguments 203 lines copy
• add_workspace_target unknown never probed

  Use this when you need to declare a reachability target for a connector. Durably insert `<assembly>.workspace(connectorRef, { reachable, toleranceMm? })` before the final top-level return. Workspace targets are checked by solvedModel validation/review pose-envelope gates. Returns modified source plus diagnostics from re-evaluation.

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  {
    "type": "object",
    "required": [
      "code",
      "assembly_binding",
      "connector_ref",
      "reachable"
    ],
    "properties": {
      "code": {
        "type": "string",
        "description": "The .kcad.ts source code."
      },
      "reachable": {
        "type": "array",
        "items": {
          "type": "array",
          "items": {
            "type": "number"
          },
          "maxItems": 3,
          "minItems": 3
        },
        "description": "World-frame Vec3 targets the connector must be able to reach."
      },
      "toleranceMm": {
        "type": "number",
        "description": "Optional non-negative tolerance in mm."
      },
      "connector_ref": {
        "type": "string",
        "description": "Connector ref \"<partName>.<connectorName>\"."
      },
      "assembly_binding": {
        "type": "string",
        "description": "JS identifier bound to assembly(...)."
      }
    }
  }

  arguments 39 lines copy
• set_scene_return unknown never probed

  Use this when you need to set how the script returns its assembly. Replace the final top-level return statement with `return <assembly>.model();` or `return <assembly>.solvedModel(poses, options?);`. Use solvedModel for mate-authored mechanisms so FK and validation run. Returns modified source plus diagnostics from re-evaluation.

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  {
    "type": "object",
    "required": [
      "code",
      "assembly_binding",
      "mode"
    ],
    "properties": {
      "code": {
        "type": "string",
        "description": "The .kcad.ts source code."
      },
      "mode": {
        "enum": [
          "model",
          "solvedModel"
        ],
        "type": "string"
      },
      "poses": {
        "type": "object",
        "description": "Optional solvedModel pose overrides keyed by mate name. Defaults to {}."
      },
      "options": {
        "type": "object",
        "description": "Optional solvedModel options such as { validate: 'warn', posesGate: 'envelope' }."
      },
      "assembly_binding": {
        "type": "string",
        "description": "JS identifier bound to assembly(...)."
      }
    }
  }

  arguments 33 lines copy
• solve_mates unknown never probed

  Use this when you need to solve the mate graph and get part poses. Run the v0.6 mate-graph solver on the active assembly. Returns { status, poses, iterations? } where each pose is a serialized Transform ({ translation, rotateAxis, rotateDeg }). Optional poses overrides mate pose values by mate name.

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  {
    "type": "object",
    "properties": {
      "poses": {
        "type": "object",
        "description": "Optional numeric pose overrides keyed by mate name."
      },
      "assembly": {
        "type": "string"
      }
    }
  }

  arguments 12 lines copy
• evaluate_sdf unknown never probed

  Use this when you need to sample a signed-distance field at a point. Sample the signed distance from an in-script sdf.* field at a 3D point. Returns { distance, inside, aabb, kind }. Distance is in mm; negative = inside the surface, 0 = exactly on the surface, positive = outside. Use this to verify SDF composition before calling sdf.materialize (which is the expensive step). The script must bind the SdfField via sdf.bind('<name>', field) and pass that name as fieldName. Hint: pass either { file } or { code }, plus { fieldName, point: [x,y,z] }.

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  {
    "type": "object",
    "required": [
      "fieldName",
      "point"
    ],
    "properties": {
      "code": {
        "type": "string",
        "description": "Inline kernelCAD script source."
      },
      "file": {
        "type": "string",
        "description": "Path to a .kcad.ts script file."
      },
      "point": {
        "type": "array",
        "items": {
          "type": "number"
        },
        "maxItems": 3,
        "minItems": 3,
        "description": "Sample point [x, y, z] in mm."
      },
      "fieldName": {
        "type": "string",
        "description": "sdf.bind binding name holding the SdfField."
      }
    }
  }

  arguments 30 lines copy
• render_preview unknown never probed

  Use this when you need to LOOK at a kernelCAD model — render its script to deterministic PNG views for visual self-check (the visual half of the evaluate → render → inspect → fix loop), with NO studio or dev server required. Pass { code } (inline source) or { file } (a .kcad.ts path), exactly one. Renders the canonical engineering views (front, right, top, iso — pass { views } for a subset, e.g. ["iso"] for fastest iteration) plus an optional { pose: "<az>,<el>" } arbitrary camera angle (degrees; az=0,el=0 is front, +az rotates CCW around +Z, +el lifts the camera). NO STUDIO / DEV-SERVER REQUIRED: a prebuilt static player (dist/headless-player) is served from an ephemeral local port automatically; a running studio dev server is used as fallback, and { base_url } forces one. The only environment dependency is playwright chromium (npx playwright install chromium). Pass { focus } or { hide } (arrays of feature ids or assembly part names, mutually exclusive) to isolate parts — same semantics as `kernelcad render --focus/--hide`. Pass { section: { axis, position, flip? } } to cut a cross-section and inspect INTERIOR geometry (wall thickness, internal pockets, whether a bore runs through) rather than only the outer shell. Pass { explode: { factor, mode? } } to pull a multi-part assembly apart (mode: "mate-axis" default, or "radial") using the same mesher as `kernelcad render --explode` — requires assembly.model()/solvedModel(). PNGs are written to { out_dir } (default: a fresh temp session directory) and returned as absolute paths with per-view camera descriptions (kernelCAD is Z-up). Mechanism truth runs first, same protocol as `kernelcad render`: a broken mechanism still renders but every tile is watermarked MECHANISM BROKEN (KERNELCAD_RENDER_STRICT=1 refuses instead); read { mechanism, mechanism_failure_codes }. The probe runs full BREP interference sweeps and can dominate latency on large assemblies — pass { no_mechanism_check: true } for fast iteration (the preview then reports mechanism: "unverified"; ignored under strict mode). Pass { overlay: 'zebra' | 'curvature' | 'continuity' } for a surface-quality visualisation (zebra stripes from vertex normals, curvature as vertex colours, continuity edges coloured by G0/G1/G2/broken) — numbers come from inspect({ of: 'continuity' | 'curvature' }); the overlay is the picture. Returns { ok, images: [{ name, path, description }], out_dir, bounds, mechanism, render_source, render_ms, diagnostics }. PATHS ARE LOCAL to the machine running the MCP server — local stdio clients read them directly; hosted/remote clients should use open_in_studio instead.

  mcp-tool

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  {
    "type": "object",
    "properties": {
      "code": {
        "type": "string",
        "description": "Inline kernelCAD script source. Mutually exclusive with file. Relative imports resolve against a temp dir — use file for scripts with relative lib.fromSTEP(...) imports."
      },
      "file": {
        "type": "string",
        "description": "Path to a .kcad.ts script on disk. Mutually exclusive with code."
      },
      "hide": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "Hide matching feature ids / assembly part names. Mutually exclusive with focus."
      },
      "pose": {
        "type": "string",
        "description": "Extra arbitrary camera pose '<az>,<el>' in degrees, e.g. '30,20'."
      },
      "focus": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "Show only matching feature ids / assembly part names. Mutually exclusive with hide."
      },
      "views": {
        "type": "array",
        "items": {
          "enum": [
            "front",
            "right",
            "top",
            "iso"
          ],
          "type": "string"
        },
        "description": "Canonical views to render as an array, e.g. [\"iso\"] or [\"front\",\"top\"] (default: all four). Fewer views = faster."
      },
      "width": {
        "type": "integer",
        "maximum": 2048,
        "minimum": 64,
        "description": "Per-view tile width in px (default 768)."
      },
      "height": {
        "type": "integer",
        "maximum": 2048,
        "minimum": 64,
        "description": "Per-view tile height in px (default 768)."
      },
      "explode": {
        "type": "object",
        "required": [
          "factor"
        ],
        "properties": {
          "mode": {
            "enum": [
              "radial",
              "mate-axis"
            ],
            "type": "string"
          },
          "factor": {
            "type": "number",
            "minimum": 0
          }
        },
        "description": "Pull a multi-part assembly apart for the preview. factor ≥ 0 scales spacing by part size; mode is 'mate-axis' (default, along parent mate/joint axes) or 'radial' (away from the assembly centroid). Requires the script to return assembly.model() / solvedModel().",
        "additionalProperties": false
      },
      "out_dir": {
        "type": "string",
        "description": "Directory for the PNGs (created if missing). Default: a fresh temp session dir."
      },
      "overlay": {
        "enum": [
          "zebra",
          "curvature",
          "continuity"
        ],
        "type": "string",
        "description": "Surface-quality overlay: 'zebra' (reflection stripes), 'curvature' (Gaussian vertex colours), 'continuity' (edges coloured G2 green / G1 yellow / G0 orange / broken red). Built as coloured STL bands through this same pipeline."
      },
      "section": {
        "type": "object",
        "required": [
          "axis",
          "position"
        ],
        "properties": {
          "axis": {
            "enum": [
              "x",
              "y",
              "z"
            ],
            "type": "string"
          },
          "flip": {
            "type": "boolean",
            "default": false
          },
          "position": {
            "type": "number"
          }
        },
        "description": "Cut the model with one axis-aligned section plane to inspect INTERIOR structure (wall thickness, internal pockets, whether a bore runs through) instead of only the outer shell. position is in mm along the axis (kernelCAD Z-up frame); flip keeps the +axis side (default keeps the -axis side).",
        "additionalProperties": false
      },
      "base_url": {
        "type": "string",
        "description": "Advanced: force a specific render server (e.g. a running studio dev server) instead of the bundled static player."
      },
      "environment": {
        "type": "string",
        "description": "HDRI environment override: preset ('studio', 'softbox', 'neutral', 'outdoor', 'warehouse'), a URL, or 'none' for the default three-light rig."
      },
      "no_watermark": {
        "type": "boolean",
        "default": false,
        "description": "Suppress the kernelCAD version watermark."
      },
      "no_mechanism_check": {
        "type": "boolean",
        "default": false,
        "description": "Skip the mechanism-truth probe for fast iteration on large assemblies; the preview reports mechanism: 'unverified'. Ignored under KERNELCAD_RENDER_STRICT=1."
      }
    }
  }

  arguments 134 lines copy
• resolve_assumptions unknown never probed

  Use this when you need to confirm or override the open facts in an assumption ledger from trace_from_image (missing scale, inferred/assumed values) before committing geometry built from a reference photo. Reads the persisted `<model>.ledger.json` at `ledgerPath`, applies each resolution — `{ id, confirm: true }` to accept a fact as-is, or `{ id, value }` to override it — rewrites the ledger file, and returns the updated ledger plus `paramOverrides` (factId -> value) to feed straight into `set_param`. Pair with the `kernelcad-from-reference` skill.

  mcp-tool

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  {
    "type": "object",
    "required": [
      "ledgerPath",
      "resolutions"
    ],
    "properties": {
      "ledgerPath": {
        "type": "string",
        "description": "Path to the `<model>.ledger.json` file persisted alongside the traced source."
      },
      "resolutions": {
        "type": "array",
        "items": {
          "type": "object",
          "required": [
            "id"
          ],
          "properties": {
            "id": {
              "type": "string",
              "description": "Matches a `facts[].id` in the ledger."
            },
            "value": {
              "description": "Overrides the fact's value; marks it `overridden`."
            },
            "confirm": {
              "type": "boolean",
              "description": "Accepts the fact as-is; marks it `confirmed`."
            }
          }
        },
        "description": "One resolution per ledger fact id to act on."
      }
    }
  }

  arguments 36 lines copy

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