Endpoints: 28,729MCP servers: 18,413Payout addresses: 2,071Paid calls: 1,541Letters: 14Defects: 1,323counted 4 min ago
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Server definition

Hash
sha256:a04324a03693bd71aa95dbe383940dda89eba88bd2e6b5f807190ed883a4b730
What it is
What a remote MCP server returned when asked what it offers: 17 tools

The blob, as servednamed by its sha256

{ "instructions": "tc39-mcp serves read-only structured data from the TC39 specs\n(ECMA-262 + ECMA-402), tc39/test262, and tc39/proposals. Every\nresponse is deterministic over data pinned to specific upstream\nSHAs.\n\nIndependent project — not an official Ecma International or TC39\npublication.\n\nThis is the hosted Cloudflare Worker deployment — 17 of the\n19 tools (call tools/list for the set). The\n2 stdio-only ones (spec.history, test262.get) are\navailable via the stdio server (npx tc39-mcp).\n\nCommon workflow:\n 1. `spec.about` — call first to see what SHAs and editions the\n server is serving. Returns per-snapshot pin metadata.\n 2. `spec.search` — find a clause from a name or symptom. Hits\n rank aoid-exact > aoid-substring > title > id; follow up with\n `clause.get { id }` to read the full clause. To find clauses by\n what they DO (e.g. which clauses invoke OrdinaryGetOwnProperty),\n pass search_steps: true to also scan algorithm step text — off by\n default since it is slower + noisier.\n 3. `clause.get { id, spec?, edition? }` — full structured clause. A clause id is also a test262\n esid — test262.search { esid: <clause-id> } returns the\n conformance tests for that clause.\n\nEdition semantics. `latest` is spec-aware:\n - On 262, `latest` → current stable release (es2026 today).\n - On 402, `latest` → current stable release (es2026 today).\n - `main` is always the working draft.\n\nHistorical pinning. `main` moves. Pass `at: \"<sha>\"` to query a\nspecific historical snapshot (4-40 hex chars, prefix-matched). The\nhosted Worker retains every `main` SHA it has deployed since\nlaunch; the live snapshot is `at`-less. Released editions like\n`es2026` have no per-SHA history, so `at` doesn't apply — it only\naddresses `main`.\n\nMissing data is never an error. Tools return null, empty arrays, or\na `hint:` field. `source: \"none\"` on `proposal.list` means the\noffline index isn't present in R2 — surface the hint to the user.\n\nMCP prompts (workflow templates) — prefer these when the user wants a\nguided multi-tool sequence. Available prompts: explain-clause,\ncompare-editions, find-and-read, trace-crossrefs, proposal-status,\ntest262-for-feature, cite-reproducibly. Call prompts/list for their\nargument shapes.\n\nAll data is read-only: no tool modifies anything upstream, no tool\nruns user-supplied code. Safe to call freely.", "tools": [ { "description": "Fetch a parsed TC39 clause as structured JSON. `spec` selects '262' (default) or '402'. `edition` defaults to 'latest'. `at: '<sha>'` pins to a historical main snapshot (only valid for edition='main'); omit to query the live snapshot.", "inputSchema": { "properties": { "at": { "description": "Optional historical SHA pin (hex, 4-40 chars). Only valid when edition='main'; released editions have no per-SHA history to address.", "type": "string" }, "edition": { "type": "string" }, "id": { "type": "string" }, "spec": { "enum": [ "262", "402" ], "type": "string" } }, "required": [ "id" ], "type": "object" }, "name": "clause.get", "outputSchema": null }, { "description": "List parsed spec clauses with optional filters (kind, section prefix, has_algorithm). `spec` selects '262' or '402'. `at: '<sha>'` queries a historical main snapshot.", "inputSchema": { "properties": { "at": { "type": "string" }, "edition": { "type": "string" }, "has_algorithm": { "type": "boolean" }, "kind": { "type": "string" }, "limit": { "type": "number" }, "section": { "type": "string" }, "spec": { "enum": [ "262", "402" ], "type": "string" } }, "type": "object" }, "name": "clause.list", "outputSchema": null }, { "description": "Return the section tree (table of contents) for a parsed (spec, edition). `depth` caps how deep the tree descends (1 = top-level only); `under` limits the tree to descendants of one clause id.", "inputSchema": { "properties": { "depth": { "type": "number" }, "edition": { "type": "string" }, "spec": { "enum": [ "262", "402" ], "type": "string" }, "under": { "type": "string" } }, "type": "object" }, "name": "clause.outline", "outputSchema": null }, { "description": "Fetch one TC39 proposal by slug (exact) or name (case-insensitive).", "inputSchema": { "properties": { "name": { "type": "string" } }, "required": [ "name" ], "type": "object" }, "name": "proposal.get", "outputSchema": null }, { "description": "List TC39 proposals from the static index (tc39/proposals). Filter by spec ('262'|'402'), stage ('0'|'1'|'2'|'2.7'|'3'|'finished'|'inactive'|'active'), champion (substring), or contains (name/slug substring).", "inputSchema": { "properties": { "champion": { "type": "string" }, "contains": { "type": "string" }, "limit": { "type": "number" }, "spec": { "enum": [ "262", "402" ], "type": "string" }, "stage": { "type": "string" } }, "type": "object" }, "name": "proposal.list", "outputSchema": null }, { "description": "Self-description of this MCP server: package name + version, per-snapshot pin metadata (sha, fetched_at, biblio_commit, clause_count) for every supported (spec, edition), plus test262 + proposals index headers when present.", "inputSchema": { "additionalProperties": false, "properties": {}, "type": "object" }, "name": "spec.about", "outputSchema": null }, { "description": "For a clause id, return its outgoing references (clauses it cites) and/or incoming references (clauses that cite it — the back-reference index the parse alone doesn't expose). The reverse index is AOID-densified from step text. `direction`: 'in' | 'out' | 'both' (default). Outgoing also carries an `external` category: the clause's citations to external specs (Unicode, IETF, WHATWG) as resolvable URLs. Set `include_cross_spec: true` to also resolve outgoing references from ECMA-262 → ECMA-402 (or vice versa).", "inputSchema": { "properties": { "direction": { "enum": [ "in", "out", "both" ], "type": "string" }, "edition": { "type": "string" }, "id": { "type": "string" }, "include_cross_spec": { "type": "boolean" }, "limit": { "type": "number" }, "spec": { "enum": [ "262", "402" ], "type": "string" } }, "required": [ "id" ], "type": "object" }, "name": "spec.crossrefs", "outputSchema": null }, { "description": "Clause-level diff of one clause across two editions of a spec. Reports identical / modified / added / removed plus a field-level breakdown (title, signature, step count, reworded step indices, notes, crossrefs). `from` defaults to the latest stable release, `to` to main.", "inputSchema": { "properties": { "from": { "type": "string" }, "id": { "type": "string" }, "spec": { "enum": [ "262", "402" ], "type": "string" }, "to": { "type": "string" } }, "required": [ "id" ], "type": "object" }, "name": "spec.diff", "outputSchema": null }, { "description": "Run spec.search across both ECMA-262 and ECMA-402 in one call and interleave hits by score. Each hit is tagged with the spec it came from. Use it when you don't know which spec defines a symbol. `search_steps` also matches algorithm step text.", "inputSchema": { "properties": { "limit": { "type": "number" }, "query": { "type": "string" }, "search_steps": { "type": "boolean" } }, "required": [ "query" ], "type": "object" }, "name": "spec.global_search", "outputSchema": null }, { "description": "Query grammar productions captured from the spec's `<emu-grammar>` blocks. `{ nonterminal }` returns every production for that non-terminal (exact match); `{ contains }` filters by RHS / name substring; neither lists all non-terminals + their production counts. `include_sdo` folds in SDO-attached productions (off by default).", "inputSchema": { "properties": { "contains": { "type": "string" }, "edition": { "type": "string" }, "include_sdo": { "type": "boolean" }, "limit": { "type": "number" }, "nonterminal": { "type": "string" }, "spec": { "enum": [ "262", "402" ], "type": "string" } }, "type": "object" }, "name": "spec.grammar", "outputSchema": null }, { "description": "Index Syntax-Directed Operations by the grammar production they're defined on. `by: 'production'` (default) groups SDOs under each production; `by: 'sdo'` groups productions under each SDO title. `filter` narrows to keys containing a substring (case-insensitive).", "inputSchema": { "properties": { "by": { "enum": [ "production", "sdo" ], "type": "string" }, "edition": { "type": "string" }, "filter": { "type": "string" }, "limit": { "type": "number" }, "spec": { "enum": [ "262", "402" ], "type": "string" } }, "type": "object" }, "name": "spec.sdo_index", "outputSchema": null }, { "description": "Search the parsed spec by clause id / aoid / title (+ step text with `search_steps`). Aoid-exact ranks first. `at: '<sha>'` searches a historical main snapshot.", "inputSchema": { "properties": { "at": { "type": "string" }, "edition": { "type": "string" }, "limit": { "type": "number" }, "query": { "type": "string" }, "search_steps": { "type": "boolean" }, "spec": { "enum": [ "262", "402" ], "type": "string" } }, "required": [ "query" ], "type": "object" }, "name": "spec.search", "outputSchema": null }, { "description": "List the live (spec, edition, sha, fetched_at) snapshots the hosted Worker is serving from R2. Filter by `spec` ('262'|'402') or `edition` (e.g. 'main', 'es2026'). Historical SHA-pinned copies are reachable via `at:` on clause.get / spec.search but aren't enumerated here.", "inputSchema": { "properties": { "edition": { "type": "string" }, "spec": { "enum": [ "262", "402" ], "type": "string" } }, "type": "object" }, "name": "spec.snapshots", "outputSchema": null }, { "description": "Resolve spec notation like `[[Prototype]]` (internal slot), `%Object.prototype%` (well-known intrinsic), or `~number~` (sigil enum): return clauses that mention or define it, ranked by occurrence with a bump for definition-y sections.", "inputSchema": { "properties": { "edition": { "type": "string" }, "limit": { "type": "number" }, "notation": { "type": "string" }, "spec": { "enum": [ "262", "402" ], "type": "string" } }, "required": [ "notation" ], "type": "object" }, "name": "spec.symbol_resolve", "outputSchema": null }, { "description": "List or fetch parsed `<emu-table>` content. `{ id }` returns exactly that table (full columns + rows); otherwise list table summaries, optionally narrowed by a `filter` substring over the caption or id.", "inputSchema": { "properties": { "edition": { "type": "string" }, "filter": { "type": "string" }, "id": { "type": "string" }, "limit": { "type": "number" }, "spec": { "enum": [ "262", "402" ], "type": "string" } }, "type": "object" }, "name": "spec.tables", "outputSchema": null }, { "description": "Enumerate the well-known intrinsics in a spec with their probable defining clauses. Driven from the canonical §6.1.7.4 WKI table when present (ECMA-262), else a `%X%` prose scan (e.g. ECMA-402). `filter` narrows by bare-name substring.", "inputSchema": { "properties": { "edition": { "type": "string" }, "filter": { "type": "string" }, "limit": { "type": "number" }, "spec": { "enum": [ "262", "402" ], "type": "string" } }, "type": "object" }, "name": "spec.well_known_intrinsics", "outputSchema": null }, { "description": "Search the tc39/test262 conformance suite from its indexed front-matter. `query` AND-matches whitespace tokens (case-insensitive) across each test's description + path; `esid` prefix-matches the front-matter esid. Returns ranked hits (path, GitHub url at the indexed SHA, esid, description, features, flags), capped at `limit` (default 20). Supply at least one of `query` / `esid`.", "inputSchema": { "properties": { "esid": { "type": "string" }, "limit": { "type": "number" }, "query": { "type": "string" } }, "type": "object" }, "name": "test262.search", "outputSchema": null } ] }
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