tabnas

endpoint

https://mcp.tabnas.dev/mcp

protocol

streamable-http ·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 tabnas live?

Yes — it answered the hub's last check (checked 39m ago). It answered 100% of checks over the last 30 days.

Is tabnas free to use?

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

What tools does tabnas have?

7 tools: parse, test_grammar, compare_grammars, explain_parse_error, validate_grammar, list_plugins, describe_plugin.

Is tabnas 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.

• list_plugins reads open 22h ago

  List every bundled tabnas plugin descriptor (tabnas.plugin.json of each fleet repo), sorted by name. Returns {plugins:[...]}.

  mcp-tool

  12345

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

  arguments 5 lines copy
• describe_plugin reads open 22h ago

  The full descriptor for one plugin, by package name ('@tabnas/csv') or bare fleet name ('csv'). Unknown names get {ok:false, errors} naming the known plugins.

  mcp-tool

  12345678910111213

  {
    "type": "object",
    "required": [
      "name"
    ],
    "properties": {
      "name": {
        "type": "string",
        "description": "Plugin name."
      }
    },
    "additionalProperties": false
  }

  arguments 13 lines copy
• parse reads unknown never probed

  Parse input with the tabnas engine. Returns {ok:true, tree} or, on parse failure, {ok:false, diagnostic} — the structured diagnostic described by resource tabnas://schema/diagnostic. An invalid grammar is rejected as {ok:false, errors:[{path,message}]}. Without a grammar the bare engine is used, which defines no rules and produces an undefined tree for every input.

  mcp-tool

  123456789101112131415161718192021

  {
    "type": "object",
    "required": [
      "input"
    ],
    "properties": {
      "input": {
        "type": "string",
        "description": "Source text to parse."
      },
      "grammar": {
        "type": "object",
        "description": "Serialized GrammarSpec (pure JSON, no functions). Schema: resource tabnas://schema/grammar. Grammars are validated before use; a `ref` key or a non-builtin function reference is rejected."
      },
      "options": {
        "type": "object",
        "description": "TabnasOptions applied to the fresh instance before the grammar. Data only: a plugins entry is rejected."
      }
    },
    "additionalProperties": false
  }

  arguments 21 lines copy
• test_grammar reads unknown never probed

  Run TSV fixture content against a grammar in a fresh instance, using the fleet fixture convention (@tabnas/support): line 1 is a header, the input column is escape-decoded, the expected column is JSON or ERROR / ERROR:<code>. Returns {pass, fail, rows:[{row,input,expected,got,ok}]}. Refuses more than 10000 rows.

  mcp-tool

  12345678910111213141516171819202122232425262728293031323334353637

  {
    "type": "object",
    "required": [
      "spec"
    ],
    "properties": {
      "spec": {
        "type": "string",
        "description": "TSV fixture content (not a path)."
      },
      "grammar": {
        "type": "object",
        "description": "Serialized GrammarSpec (pure JSON, no functions). Schema: resource tabnas://schema/grammar. Grammars are validated before use; a `ref` key or a non-builtin function reference is rejected."
      },
      "options": {
        "type": "object",
        "properties": {
          "inputCol": {
            "type": [
              "integer",
              "string"
            ],
            "description": "Input column, by position or header name. Default 0."
          },
          "expectedCol": {
            "type": [
              "integer",
              "string"
            ],
            "description": "Expected column, by position or header name. Default 1."
          }
        },
        "additionalProperties": false
      }
    },
    "additionalProperties": false
  }

  arguments 37 lines copy
• compare_grammars reads unknown never probed

  Grammar compatibility (AX plan Phase 5): does candidate grammar B still accept what baseline A accepted, and does it build the same tree for inputs both accept? Returns EVIDENCE AND CONFIDENCE, never a bare verdict: {normalForm, proven[], observed[], changes[], counterexamples[], confidence, why}. confidence:'low' with a stated reason is a successful run, not a failure — language inclusion is undecidable in general, so anything outside the decidable subset is reported not-proven rather than incompatible. Supply `corpus` (real inputs) for the tier that measures what your documents actually do.

  mcp-tool

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  {
    "type": "object",
    "required": [
      "a",
      "b"
    ],
    "properties": {
      "a": {
        "type": "object",
        "description": "Baseline grammar: the serialized GrammarSpec already deployed."
      },
      "b": {
        "type": "object",
        "description": "Candidate grammar: the serialized GrammarSpec proposed to replace it."
      },
      "depth": {
        "type": "integer",
        "maximum": 5,
        "minimum": 0,
        "description": "Derivation depth for generated inputs (default 3)."
      },
      "corpus": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "Inputs to replay through both grammars, comparing acceptance and tree shape."
      },
      "options": {
        "type": "object",
        "description": "TabnasOptions applied to both instances."
      }
    },
    "additionalProperties": false
  }

  arguments 35 lines copy
• explain_parse_error reads unknown never probed

  Parse input and explain the failure. Returns {failed:false} when the input parses; otherwise {failed:true, diagnostic, registry} where registry is the error-code registry entry {code,message,hint} for the diagnostic code (resource tabnas://errors), or null for a code the bundled registry does not know (e.g. a plugin-declared code).

  mcp-tool

  1234567891011121314151617

  {
    "type": "object",
    "required": [
      "input"
    ],
    "properties": {
      "input": {
        "type": "string",
        "description": "Source text to parse."
      },
      "grammar": {
        "type": "object",
        "description": "Serialized GrammarSpec (pure JSON, no functions). Schema: resource tabnas://schema/grammar. Grammars are validated before use; a `ref` key or a non-builtin function reference is rejected."
      }
    },
    "additionalProperties": false
  }

  arguments 17 lines copy
• validate_grammar reads unknown never probed

  Validate a serialized GrammarSpec. Structural validation against the bundled grammar schema, an engine load in a fresh instance, and a check that every rule reference (`p`, `r`) names a rule the grammar actually defines — a dangling reference loads cleanly and then fails at parse time with `unknown_rule`. Returns {ok:true, v} (v = declared builtin config-schema version, absent means 1) or {ok:false, errors:[{path,message}]}. Security: a grammar carrying a `ref` key, or any function reference that is not a $-suffixed engine builtin, is rejected — validating a grammar never runs supplied code.

  mcp-tool

  12345678910111213

  {
    "type": "object",
    "required": [
      "grammar"
    ],
    "properties": {
      "grammar": {
        "type": "object",
        "description": "Serialized GrammarSpec (pure JSON, no functions). Schema: resource tabnas://schema/grammar. Grammars are validated before use; a `ref` key or a non-builtin function reference is rejected."
      }
    },
    "additionalProperties": false
  }

  arguments 13 lines copy

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