Kokkai Diet MCP Server

@pipeworx/kokkai-diet

Speech-level full-text search of Japanese National Diet (parliament) proceedings back to 1947 — both chambers, every recorded speech with speaker, party, session, date, and a permalink.

Part of Pipeworx — an MCP gateway connecting AI agents to 1865+ live data sources. This is an independent, unofficial integration — not affiliated with, endorsed by, or published by the upstream provider.

Tools

• search_speeches(query?, speaker?, speaker_group?, house?, from?, until?, start_record?, max_records?) — full-text speech search by keyword and/or speaker, with optional party/house/date-range filters. Paginated (max 100/request).
• search_meetings(query?, meeting_name?, house?, from?, until?, start_record?, max_records?) — find meetings/sittings by name, chamber, or date range. Paginated (max 10/request — lower cap than speeches).
• get_speech(speech_id) — fetch one speech's full text and metadata by its speechID.

Auth

Keyless.

Data sources

• https://kokkai.ndl.go.jp/api/speech — speech-level full-text search.
• https://kokkai.ndl.go.jp/api/meeting — meeting-level search.

Both are JSON/XML endpoints of the National Diet Library's 国会会議録検索システム (Kokkai Kaigiroku Search System).

Traps for the next person

• The API requires a real search anchor. from/until/nameOfHouse alone are accepted (200 OK) but silently return zero records — they're filters, not search conditions. search_speeches requires query and/or speaker; search_meetings requires query, meeting_name, or house. A no-condition request 400s with (19007)検索条件を指定してください.
• Per-request record caps differ by endpoint, and out-of-range values 400 rather than clamp. /api/speech: maximumRecords 1–100 (default 30). /api/meeting: maximumRecords 1–10 (default 3) — easy to miss since it's a third the speech cap. Both tools here clamp client-side to the valid range, but a caller reading raw upstream docs will hit (19005)/(19006) if they don't.
• Never let a capped page read as the complete result. Both tools return next_start_record (from the API's nextRecordPosition) and is_complete_result (true only when next_start_record is null). total (upstream numberOfRecords) is the true count — a caller must check it against returned before assuming they've seen everything.
• Queries are Japanese-first. The full-text index is Japanese; partial-match works on Japanese substrings. English keywords (e.g. "semiconductors") will under-match or return zero even when substantial Japanese-language debate exists on the topic — use Japanese keywords (e.g. "半導体"). Tool descriptions say this explicitly so an empty result isn't misread as "no debate on this".
• search_speeches returns a speech preview (400 chars), not the full text — fetch the complete speech with get_speech(speech_id) using the speech_id from the search hit. This keeps list responses from blowing up on speeches that run thousands of characters.
• 400 error bodies from the upstream carry a useful Japanese message + details array (e.g. (19005)maximumRecordsには1～100の値を指定してください) — this pack surfaces that text verbatim rather than a generic HTTP error, since it tells the caller exactly which parameter is wrong.

Quick Start

Add to your MCP client (Claude Desktop, Cursor, Windsurf, etc.):

{
  "mcpServers": {
    "kokkai-diet": {
      "url": "https://gateway.pipeworx.io/kokkai-diet/mcp"
    }
  }
}

What this endpoint actually serves

tools/list at https://gateway.pipeworx.io/kokkai-diet/mcp returns the tools in the table above plus the shared Pipeworx meta-tools — ask_pipeworx, discover_tools, search_within, remember/recall and the rest of the gateway-wide set. So the tool count you see is larger than this table: a single-pack endpoint currently lists roughly 30 shared tools alongside the pack's own. The connection's initialize response states its exact scope, and is the authoritative answer for a given day.

This is deliberate, not multiplexing by accident. The meta-tools are what let a scoped connection answer a question this pack does not cover — via ask_pipeworx, which routes across the whole catalog — without you adding a second MCP server. There is currently no way to mount a pack endpoint without them; if the extra schemas cost you more context than the routing is worth, connect to the full gateway once rather than to several pack endpoints.

Or connect to the full Pipeworx gateway to get every pack's tools listed directly, instead of just this one's:

{
  "mcpServers": {
    "pipeworx": {
      "url": "https://gateway.pipeworx.io/mcp"
    }
  }
}

Both URLs reach the same gateway and the same 1865+ data sources. The only difference is which pack's tools are listed directly; ask_pipeworx reaches all of them from either one.

No MCP client? Call it over HTTP

curl -X POST https://gateway.pipeworx.io/v1/tools/search_speeches \
  -H 'Content-Type: application/json' \
  -d '{"query":"半導体","max_records":5}'

No account needed for the first calls. Inspect any tool: GET https://gateway.pipeworx.io/v1/tools/search_speeches. Find one: POST https://gateway.pipeworx.io/v1/tools/search_packs with {"query":"..."}.

Run it from npm

@pipeworx/mcp-kokkai-diet is a local stdio bridge to the Pipeworx gateway: your MCP client starts it with npx, and it forwards every call to the same https://gateway.pipeworx.io/kokkai-diet/mcp endpoint shown above. It needs network access; there is no offline mode.

{
  "mcpServers": {
    "kokkai-diet": {
      "command": "npx",
      "args": ["-y", "@pipeworx/mcp-kokkai-diet"]
    }
  }
}

Without a key it calls anonymously, capped at 50 calls a day. A free account raises that to 200 a day: get a key at https://pipeworx.io/signup and add "env": { "PIPEWORX_API_KEY": "<your key>" } to the server entry. The key is sent as a Bearer token, the same way a hosted connection sends it, so calls are metered and billed exactly as they are there.

It lists only this pack's tools by default. Set PIPEWORX_META_TOOLS=1 to also list ask_pipeworx and the other gateway-wide tools.

Behind an HTTPS proxy: Node's built-in fetch does not read HTTPS_PROXY by default. Newer Node releases honour it when NODE_USE_ENV_PROXY=1 is set; check your Node version's documentation.

Using with ask_pipeworx

Instead of calling tools directly, you can ask questions in plain English — this works on the pack endpoint above as well as on the full gateway:

ask_pipeworx({ question: "your question about Kokkai Diet data" })

The gateway picks the right tool and fills the arguments automatically.

More

• Docs and guides
• pipeworx.io

License

MIT