browser-compat-mcp-server

endpoint

https://browser-compat.caseyjhand.com/mcp

protocol

http-sse ·2025-06-18

authentication

none observed

public key

none — nobody has proven they own this listing · is it yours? claim it

karma

0 · newcomer

Is browser-compat-mcp-server live?

Yes — it answered the hub's last check (checked 2h ago). It answered 100% of checks over the last 30 days.

Is browser-compat-mcp-server free to use?

Yes — the hub reached it with no key and no payment.

What tools does browser-compat-mcp-server have?

5 tools: browsercompat_search_features, browsercompat_check_baseline, browsercompat_list_reference, browsercompat_compare_support, browsercompat_get_feature.

Is browser-compat-mcp-server safe to connect?

The hub found no text in its card or tool descriptions aimed at the agent reading them. It measures what the server answers, not its code — grant it only the access its tools need.

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.

• browsercompat_search_features reads unknown 21h ago

  Find web features by plain name or keyword when the canonical key is unknown, across CSS, JavaScript, HTML, Web APIs, SVG, MathML, WebAssembly, and HTTP headers. Returns ranked matches with the BCD key, the web-features id, the Baseline state, a one-line support summary, and which field matched. Feed a result key into browsercompat_get_feature for the full record.

  mcp-tool

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  {
    "type": "object",
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "required": [
      "query"
    ],
    "properties": {
      "group": {
        "type": "string",
        "maxLength": 100,
        "minLength": 1,
        "description": "Restrict results to features in one web-features group or any group nested under it, for example \"selectors\" or \"css\". Keys with no web-features mapping never match. Call browsercompat_list_reference with topic groups for valid ids."
      },
      "limit": {
        "type": "integer",
        "default": 10,
        "maximum": 50,
        "minimum": 1,
        "description": "Maximum results to return, from 1 to 50."
      },
      "query": {
        "type": "string",
        "maxLength": 100,
        "minLength": 1,
        "description": "Plain-language name, keyword, or code notation, for example \"container query\", \"fromAsync\", \"Array.prototype.at\", \"display: grid\", or \"<dialog>\"."
      },
      "offset": {
        "type": "integer",
        "default": 0,
        "maximum": 9007199254740991,
        "minimum": 0,
        "description": "Number of ranked matches to skip before returning results, for paging past limit. Pass the nextOffset from the previous response."
      },
      "baseline": {
        "enum": [
          "widely",
          "newly",
          "limited",
          "not_mapped"
        ],
        "type": "string",
        "description": "Restrict results to one Baseline state."
      },
      "snapshot": {
        "type": "string",
        "maxLength": 100,
        "minLength": 1,
        "description": "Restrict results to features in one ECMAScript snapshot, for example \"ecmascript-2023\". Call browsercompat_list_reference with topic snapshots for valid ids."
      },
      "namespace": {
        "enum": [
          "api",
          "css",
          "html",
          "http",
          "javascript",
          "manifests",
          "mathml",
          "mediatypes",
          "svg",
          "webassembly",
          "webdriver",
          "webextensions"
        ],
        "type": "string",
        "description": "Restrict results to one top-level browser-compat-data namespace."
      }
    },
    "additionalProperties": false
  }

  arguments 70 lines copy
• browsercompat_check_baseline reads unknown 21h ago

  Check whether web features are safe to ship: Baseline state and the date it crossed, the browser and version that limits support, whether the feature is deprecated or discouraged, and the share of tracked global traffic that requiring it would exclude. Accepts up to 20 BCD keys or web-features ids in one call.

  mcp-tool

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  {
    "type": "object",
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "required": [
      "features"
    ],
    "properties": {
      "resolve": {
        "type": "boolean",
        "default": false,
        "description": "When true, an entry that is neither a key nor an id falls back to the search index, such as \"Container queries (size)\" or \"Element.prototype.animate\". Its best exact matches are accepted only when they name one feature: a single key resolves to that key, several keys of one web-features feature resolve to the feature with its feature-level Baseline and compat_keys, and matches spanning two features are a miss. Off by default so a typo returns a miss you can correct."
      },
      "features": {
        "type": "array",
        "items": {
          "type": "string",
          "maxLength": 200,
          "minLength": 1
        },
        "maxItems": 20,
        "minItems": 1,
        "description": "Up to 20 entries, each a browser-compat-data key such as css.selectors.has or a web-features id such as has, 1 to 200 characters. An empty or longer entry is rejected against this schema; a whitespace-only entry returns invalid_feature_input. Call browsercompat_search_features first for any entry whose key you do not already know."
      }
    },
    "additionalProperties": false
  }

  arguments 26 lines copy
• browsercompat_list_reference reads unknown 21h ago

  Enumerate the reference vocabulary this server uses: BCD namespaces, BCD browser ids, browserslist agent ids and their BCD counterparts, Baseline states, web-features groups, and ECMAScript snapshots. Use it to build valid inputs for the other tools and to see which target browsers can be evaluated.

  mcp-tool

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  {
    "type": "object",
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "required": [
      "topic"
    ],
    "properties": {
      "topic": {
        "enum": [
          "bcd_namespaces",
          "bcd_browsers",
          "browserslist_agents",
          "baseline_states",
          "groups",
          "snapshots"
        ],
        "type": "string",
        "description": "Which vocabulary to list: bcd_namespaces for the 12 top-level browser-compat-data namespaces, bcd_browsers for the 17 tracked browsers, browserslist_agents for the 19 browserslist ids mapped to browser-compat-data browsers, baseline_states for the 4 Baseline states, groups for the 104 web-features groups, or snapshots for the 11 ECMAScript snapshots."
      }
    },
    "additionalProperties": false
  }

  arguments 22 lines copy
• browsercompat_compare_support reads unknown 18h ago

  Compute whether a set of web features clears an explicit browserslist target query. Every call evaluates the whole query: each feature gets a verdict, the count of failing targets, and its own evaluated and unevaluated target counts with the share of tracked traffic each covers. The target rows behind those numbers — which release each target maps to, which targets were not evaluated and why, and the failing and unevaluated targets of each feature — cover at most ten query targets per call; page through them with target_offset and target_limit, and the verdicts, coverage, and totals stay identical on every page. A target counts as evaluated only where compatibility data was read for it, so a feature clears only when every target in the query was evaluated and supports it, and is inconclusive otherwise — a query that includes a browser with no compatibility data, as "defaults" does, never clears.

  mcp-tool

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  {
    "type": "object",
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "required": [
      "features",
      "targets"
    ],
    "properties": {
      "resolve": {
        "type": "boolean",
        "default": false,
        "description": "When true, an entry that is neither a key nor an id falls back to the search index, such as \"Container queries (size)\" or \"Element.prototype.animate\". Its best exact matches are accepted only when they name one feature: a single key resolves to that key and gets a verdict, several keys of one web-features feature resolve to the feature as verdict ambiguous with compat_keys, and matches spanning two features are a miss. Off by default so a typo returns a miss you can correct rather than a confident answer about the wrong feature."
      },
      "targets": {
        "type": "string",
        "maxLength": 500,
        "minLength": 1,
        "description": "A browserslist query, for example \"defaults\" or \"> 0.5%, last 2 versions\", 1 to 500 characters. Required: with no query browserslist would read config from the process working directory rather than from your project."
      },
      "features": {
        "type": "array",
        "items": {
          "type": "string",
          "maxLength": 200,
          "minLength": 1
        },
        "maxItems": 20,
        "minItems": 1,
        "description": "Up to 20 entries, each a browser-compat-data key such as css.selectors.has or a web-features id such as has, 1 to 200 characters. An empty or longer entry is rejected against this schema; a whitespace-only entry returns invalid_feature_input. Call browsercompat_search_features first for any entry whose key you do not already know."
      },
      "target_limit": {
        "type": "integer",
        "default": 10,
        "maximum": 10,
        "minimum": 1,
        "description": "How many query targets this page covers, 1 to 10. It bounds every list of target rows in the response and never the evaluation: verdicts, coverage, and totals always describe the whole query."
      },
      "target_offset": {
        "type": "integer",
        "default": 0,
        "maximum": 9007199254740991,
        "minimum": 0,
        "description": "Zero-based position in the target list of the query at which this page of target rows starts. Pass the nextOffset of the previous response to continue. An offset at or past the number of targets returns the whole-query verdicts and totals with no target rows."
      }
    },
    "additionalProperties": false
  }

  arguments 47 lines copy
• browsercompat_get_feature reads unknown 18h ago

  Get the compatibility record for one web feature: Baseline state and the date it crossed, deprecation and standards status, per-browser version added and removed with flags, vendor prefixes and partial-implementation notes, and the MDN and specification links. Accepts a BCD key such as css.selectors.has or a web-features id such as has; the response echoes which one it matched. An unresolved feature returns found: false with guidance rather than an error.

  mcp-tool

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  {
    "type": "object",
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "required": [
      "feature"
    ],
    "properties": {
      "feature": {
        "type": "string",
        "maxLength": 200,
        "minLength": 1,
        "description": "A browser-compat-data key such as css.selectors.has, or a web-features id such as has, 1 to 200 characters. An empty or longer string is rejected against this schema; a whitespace-only string returns invalid_feature_input. Call browsercompat_search_features first if you do not already know the key."
      },
      "resolve": {
        "type": "boolean",
        "default": false,
        "description": "When true, a string that is neither a key nor an id falls back to the search index, such as \"Container queries (size)\" or \"Element.prototype.animate\". Its best exact matches are accepted only when they name one feature: a single key resolves to that key, several keys of one web-features feature resolve to the feature with compat_keys, and matches spanning two features are a miss. Off by default so a typo returns a miss you can correct rather than a confident answer about the wrong feature."
      },
      "subkeys_offset": {
        "type": "integer",
        "default": 0,
        "maximum": 9007199254740991,
        "minimum": 0,
        "description": "Direct child keys to skip, default 0. Each subkeys page contains at most 100 keys; pass its next_offset to continue."
      },
      "include_runtimes": {
        "type": "boolean",
        "default": false,
        "description": "Add the bun, deno, nodejs, and oculus rows to support. Leave off for browser ship decisions."
      }
    },
    "additionalProperties": false
  }

  arguments 33 lines copy

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