{
  "data": {
    "tool": {
      "category": "",
      "endpoint": "https://mcp.tabnas.dev/mcp",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/tabnas-mcp.json",
      "kind": "mcp",
      "listed": "indexed",
      "liveUrl": "https://www.anchorterminal.com/api/v1/live/tabnas-mcp.json",
      "markdownUrl": "https://www.anchorterminal.com/tools/tabnas-mcp.md",
      "mcpTools": {
        "check": {
          "checker": "anchor-check/1.0",
          "totalTokens": 1410,
          "counts": {
            "error": 0,
            "note": 1,
            "warn": 13
          },
          "findings": [
            {
              "rule": "TC11",
              "severity": "warn",
              "tool": "test_grammar",
              "message": "1 parameter without a description: options",
              "fix": "Describe each one: format, units, an example, and what happens when it's left out."
            },
            {
              "rule": "TC13",
              "severity": "warn",
              "tool": "compare_grammars",
              "message": "a (object with no properties), b (object with no properties), options (object with no properties)",
              "fix": "Declare the properties (or additionalProperties with a schema) and the array's items."
            },
            {
              "rule": "TC13",
              "severity": "warn",
              "tool": "explain_parse_error",
              "message": "grammar (object with no properties)",
              "fix": "Declare the properties (or additionalProperties with a schema) and the array's items."
            },
            {
              "rule": "TC13",
              "severity": "warn",
              "tool": "parse",
              "message": "grammar (object with no properties), options (object with no properties)",
              "fix": "Declare the properties (or additionalProperties with a schema) and the array's items."
            },
            {
              "rule": "TC13",
              "severity": "warn",
              "tool": "test_grammar",
              "message": "grammar (object with no properties)",
              "fix": "Declare the properties (or additionalProperties with a schema) and the array's items."
            },
            {
              "rule": "TC13",
              "severity": "warn",
              "tool": "validate_grammar",
              "message": "grammar (object with no properties)",
              "fix": "Declare the properties (or additionalProperties with a schema) and the array's items."
            },
            {
              "rule": "TC16",
              "severity": "warn",
              "tool": "compare_grammars",
              "message": "no readOnlyHint or destructiveHint",
              "fix": "Set readOnlyHint: true if it only reads; otherwise set destructiveHint and idempotentHint."
            },
            {
              "rule": "TC16",
              "severity": "warn",
              "tool": "describe_plugin",
              "message": "no readOnlyHint or destructiveHint",
              "fix": "Its name starts with \"describe\"; if it only reads, set readOnlyHint: true so harnesses can run it without asking."
            },
            {
              "rule": "TC16",
              "severity": "warn",
              "tool": "explain_parse_error",
              "message": "no readOnlyHint or destructiveHint",
              "fix": "Its name starts with \"explain\"; if it only reads, set readOnlyHint: true so harnesses can run it without asking."
            },
            {
              "rule": "TC16",
              "severity": "warn",
              "tool": "list_plugins",
              "message": "no readOnlyHint or destructiveHint",
              "fix": "Its name starts with \"list\"; if it only reads, set readOnlyHint: true so harnesses can run it without asking."
            },
            {
              "rule": "TC16",
              "severity": "warn",
              "tool": "parse",
              "message": "no readOnlyHint or destructiveHint",
              "fix": "Set readOnlyHint: true if it only reads; otherwise set destructiveHint and idempotentHint."
            },
            {
              "rule": "TC16",
              "severity": "warn",
              "tool": "test_grammar",
              "message": "no readOnlyHint or destructiveHint",
              "fix": "Set readOnlyHint: true if it only reads; otherwise set destructiveHint and idempotentHint."
            },
            {
              "rule": "TC16",
              "severity": "warn",
              "tool": "validate_grammar",
              "message": "no readOnlyHint or destructiveHint",
              "fix": "Its name starts with \"validate\"; if it only reads, set readOnlyHint: true so harnesses can run it without asking."
            },
            {
              "rule": "TC24",
              "severity": "note",
              "message": "7 of 7 tools have no outputSchema",
              "fix": "Declare outputSchema for tools that return structured data, and return structuredContent that matches it."
            }
          ]
        },
        "checkedAt": "2026-10-04T22:24:59Z",
        "count": 7,
        "note": "answered without the initialize handshake",
        "schemaTokens": 1410,
        "status": "ok",
        "tools": [
          {
            "name": "parse",
            "description": "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.",
            "inputSchema": {
              "additionalProperties": false,
              "properties": {
                "grammar": {
                  "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.",
                  "type": "object"
                },
                "input": {
                  "description": "Source text to parse.",
                  "type": "string"
                },
                "options": {
                  "description": "TabnasOptions applied to the fresh instance before the grammar. Data only: a plugins entry is rejected.",
                  "type": "object"
                }
              },
              "required": [
                "input"
              ],
              "type": "object"
            }
          },
          {
            "name": "validate_grammar",
            "description": "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.",
            "inputSchema": {
              "additionalProperties": false,
              "properties": {
                "grammar": {
                  "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.",
                  "type": "object"
                }
              },
              "required": [
                "grammar"
              ],
              "type": "object"
            }
          },
          {
            "name": "explain_parse_error",
            "description": "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).",
            "inputSchema": {
              "additionalProperties": false,
              "properties": {
                "grammar": {
                  "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.",
                  "type": "object"
                },
                "input": {
                  "description": "Source text to parse.",
                  "type": "string"
                }
              },
              "required": [
                "input"
              ],
              "type": "object"
            }
          },
          {
            "name": "test_grammar",
            "description": "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:\u003ccode\u003e. Returns {pass, fail, rows:[{row,input,expected,got,ok}]}. Refuses more than 10000 rows.",
            "inputSchema": {
              "additionalProperties": false,
              "properties": {
                "grammar": {
                  "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.",
                  "type": "object"
                },
                "options": {
                  "additionalProperties": false,
                  "properties": {
                    "expectedCol": {
                      "description": "Expected column, by position or header name. Default 1.",
                      "type": [
                        "integer",
                        "string"
                      ]
                    },
                    "inputCol": {
                      "description": "Input column, by position or header name. Default 0.",
                      "type": [
                        "integer",
                        "string"
                      ]
                    }
                  },
                  "type": "object"
                },
                "spec": {
                  "description": "TSV fixture content (not a path).",
                  "type": "string"
                }
              },
              "required": [
                "spec"
              ],
              "type": "object"
            }
          },
          {
            "name": "list_plugins",
            "description": "List every bundled tabnas plugin descriptor (tabnas.plugin.json of each fleet repo), sorted by name. Returns {plugins:[...]}.",
            "inputSchema": {
              "additionalProperties": false,
              "properties": {},
              "type": "object"
            }
          },
          {
            "name": "describe_plugin",
            "description": "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.",
            "inputSchema": {
              "additionalProperties": false,
              "properties": {
                "name": {
                  "description": "Plugin name.",
                  "type": "string"
                }
              },
              "required": [
                "name"
              ],
              "type": "object"
            }
          },
          {
            "name": "compare_grammars",
            "description": "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.",
            "inputSchema": {
              "additionalProperties": false,
              "properties": {
                "a": {
                  "description": "Baseline grammar: the serialized GrammarSpec already deployed.",
                  "type": "object"
                },
                "b": {
                  "description": "Candidate grammar: the serialized GrammarSpec proposed to replace it.",
                  "type": "object"
                },
                "corpus": {
                  "description": "Inputs to replay through both grammars, comparing acceptance and tree shape.",
                  "items": {
                    "type": "string"
                  },
                  "type": "array"
                },
                "depth": {
                  "description": "Derivation depth for generated inputs (default 3).",
                  "maximum": 5,
                  "minimum": 0,
                  "type": "integer"
                },
                "options": {
                  "description": "TabnasOptions applied to both instances.",
                  "type": "object"
                }
              },
              "required": [
                "a",
                "b"
              ],
              "type": "object"
            }
          }
        ]
      },
      "name": "tabnas",
      "note": "Indexed from the official MCP registry: facts and our own checks, not reviewed, so no score, grade or rank.",
      "packages": [
        {
          "registryType": "npm",
          "identifier": "@tabnas/mcp",
          "version": "0.1.17",
          "transport": "stdio"
        }
      ],
      "pageJsonUrl": "https://www.anchorterminal.com/tools/tabnas-mcp.json",
      "popularity": {
        "githubStars": 0,
        "npmWeekly": 174
      },
      "registryName": "dev.tabnas/mcp",
      "remotes": [
        {
          "type": "streamable-http",
          "url": "https://mcp.tabnas.dev/mcp"
        }
      ],
      "repository": "https://github.com/tabnas/mcp",
      "reviewed": false,
      "slug": "tabnas-mcp",
      "source": "the official MCP registry",
      "sourceUrl": "https://registry.modelcontextprotocol.io/v0.1/servers?search=dev.tabnas/mcp",
      "summary": "Seven tools over the tabnas parsing engine: parse, validate, diagnose, fixtures, compare.",
      "updatedAt": "2026-10-03T20:43:11Z",
      "url": "https://www.anchorterminal.com/tools/tabnas-mcp",
      "vendor": "tabnas.dev",
      "vendorUrl": "https://tabnas.dev/mcp",
      "version": "0.1.17",
      "websiteUrl": "https://tabnas.dev/mcp",
      "where": "both",
      "why": [
        "vendor"
      ]
    }
  },
  "kind": "anchor.page",
  "links": {
    "api": "https://www.anchorterminal.com/api/v1/index.json",
    "html": "https://www.anchorterminal.com/tools/tabnas-mcp",
    "json": "https://www.anchorterminal.com/tools/tabnas-mcp.json",
    "llms": "https://www.anchorterminal.com/llms.txt",
    "markdown": "https://www.anchorterminal.com/tools/tabnas-mcp.md",
    "slim": "https://www.anchorterminal.com/tools/tabnas-mcp.min.md"
  },
  "markdown": "# tabnas\n\n\u003e Indexed, not reviewed: facts from the official MCP registry and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/\n\n- Kind: MCP server, by tabnas.dev (https://tabnas.dev/mcp)\n- Listed because: It's published in the registry under tabnas.dev, a namespace the registry only gives to whoever proves they control that domain.\n- What the official MCP registry says: Seven tools over the tabnas parsing engine: parse, validate, diagnose, fixtures, compare.\n\n## Facts\n\n- MCP registry: `dev.tabnas/mcp` 0.1.17\n- Endpoint: https://mcp.tabnas.dev/mcp (streamable HTTP)\n- Package: npm `@tabnas/mcp` (stdio)\n- Source: https://github.com/tabnas/mcp\n- Website: https://tabnas.dev/mcp\n- npm downloads a week: 174\n- GitHub stars: 0\n- Registry entry updated: 2026-10-03\n\n## Tools\n\n- Tools it lists (7, about 1,410 tokens of context, `tools/list` without credentials, checked 2026-10-04 22:24 UTC):\n  - `parse`: Parse input with the tabnas engine. Returns {ok:true, tree} or, on parse failure, {ok:false, diagnostic} — the structured diagnostic described by resource…\n  - `validate_grammar`: Validate a serialized GrammarSpec. Structural validation against the bundled grammar schema, an engine load in a fresh instance, and a check that every rule…\n  - `explain_parse_error`: Parse input and explain the failure. Returns {failed:false} when the input parses; otherwise {failed:true, diagnostic, registry} where registry is the…\n  - `test_grammar`: 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…\n  - `list_plugins`: List every bundled tabnas plugin descriptor (tabnas.plugin.json of each fleet repo), sorted by name. Returns {plugins:[...]}.\n  - `describe_plugin`: 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.\n  - `compare_grammars`: 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…\n- How its tools read to an agent (0 errors, 13 warnings, 1 note, about 1,410 tokens; rules at https://www.anchorterminal.com/check.md; not part of the score):\n  - warn TC11 test_grammar: 1 parameter without a description: options\n  - warn TC13 compare_grammars: a (object with no properties), b (object with no properties), options (object with no properties)\n  - warn TC13 explain_parse_error: grammar (object with no properties)\n  - warn TC13 parse: grammar (object with no properties), options (object with no properties)\n  - warn TC13 test_grammar: grammar (object with no properties)\n  - warn TC13 validate_grammar: grammar (object with no properties)\n  - warn TC16 compare_grammars: no readOnlyHint or destructiveHint\n  - warn TC16 describe_plugin: no readOnlyHint or destructiveHint\n  - warn TC16 explain_parse_error: no readOnlyHint or destructiveHint\n  - warn TC16 list_plugins: no readOnlyHint or destructiveHint\n  - warn TC16 parse: no readOnlyHint or destructiveHint\n  - warn TC16 test_grammar: no readOnlyHint or destructiveHint\n  - warn TC16 validate_grammar: no readOnlyHint or destructiveHint\n  - note TC24 server: 7 of 7 tools have no outputSchema\n\n- JSON: https://www.anchorterminal.com/api/v1/tools/tabnas-mcp.json\n- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming\n",
  "meta": {
    "attribution": "Anchor Terminal (https://www.anchorterminal.com)",
    "docs": "https://www.anchorterminal.com/docs/",
    "generatedAt": "2026-10-05",
    "license": "CC-BY-4.0",
    "method": "https://www.anchorterminal.com/benchmark/",
    "methodology": "0.3",
    "openapi": "https://www.anchorterminal.com/openapi.json",
    "preview": false,
    "run": "2026-10-01",
    "runLabel": "October 2026 research run"
  },
  "page": {
    "breadcrumbs": [
      {
        "name": "Home",
        "url": "https://www.anchorterminal.com/"
      },
      {
        "name": "Terminal",
        "url": "https://www.anchorterminal.com/tools/"
      },
      {
        "name": "Indexed",
        "url": "https://www.anchorterminal.com/indexed/"
      },
      {
        "name": "tabnas",
        "url": ""
      }
    ],
    "description": "tabnas, an MCP server by tabnas.dev, listed from the official MCP registry. Indexed, not reviewed: facts and our own checks, no score or ranking. Seven tools over the tabnas parsing engine: parse, validate, diagnose, fixtures, compare.",
    "facts": [
      "not reviewed",
      "not ranked",
      "facts only"
    ],
    "h1": "tabnas",
    "image": "https://www.anchorterminal.com/assets/og/indexed.png",
    "path": "/tools/tabnas-mcp",
    "published": "",
    "section": "indexed",
    "title": "tabnas: MCP server, indexed from the official MCP registry",
    "toc": null,
    "updated": "2026-10-05",
    "url": "https://www.anchorterminal.com/tools/tabnas-mcp"
  },
  "tokens": {
    "markdown": 1050,
    "slim": 980
  },
  "version": 1
}