内容
# @codeagentjp/houan-mcp
Local stdio MCP server for searching Japanese **Diet bills (衆参議案情報)** and **committee Q&A records** via the [NDL Kokkai (国会会議録検索システム) API](https://kokkai.ndl.go.jp/).
This server does not call an LLM. It only returns source-backed Diet data, with primary URLs (NDL Kokkai, 衆議院議案情報, 参議院議案情報) so your MCP client (Claude Desktop, Claude Code, Cursor, or any other agent) can cite the original source.
Sister package: [`@codeagentjp/egov-law-mcp`](https://www.npmjs.com/package/@codeagentjp/egov-law-mcp) for current Japanese laws (e-Gov Law Search). `houan-mcp` covers the *legislative process* side: bills under deliberation, committee questionings, and full meeting transcripts.
## Status
MVP. Four tools:
- `find_diet_qa` — full-text search across all Diet committee speeches via the NDL Kokkai API. Filter by date, chamber, committee, speaker.
- `get_meeting_record` — retrieve a single committee's full transcript by `issueID`.
- `search_bills` — search current-session bills in either house by title keyword.
- `get_bill` — retrieve detail of one bill (proceedings timeline, committee assignment, full-text URL).
## Requirements
- Node.js 20 or later
- Network access to `https://kokkai.ndl.go.jp`, `https://www.shugiin.go.jp`, `https://www.sangiin.go.jp`
## Install
From npm:
```json
{
"mcpServers": {
"houan": {
"command": "npx",
"args": ["-y", "@codeagentjp/houan-mcp"]
}
}
}
```
From source:
```bash
git clone https://github.com/SHAYOUWORLD/houan-mcp.git
cd houan-mcp
node bin/houan-mcp.mjs
```
```json
{
"mcpServers": {
"houan": {
"command": "node",
"args": ["/absolute/path/to/houan-mcp/bin/houan-mcp.mjs"]
}
}
}
```
## Tools
### `find_diet_qa`
Full-text search of Diet committee speeches via the NDL Kokkai API.
```json
{
"keyword": "クロード ミトス",
"from": "2026-04-01",
"until": "2026-04-25",
"chamber": "衆議院",
"committee": "外務委員会",
"limit": 5
}
```
Returns matched speeches with speaker, position, committee context, and direct NDL URL.
### `get_meeting_record`
Retrieve a single full transcript by `issueID`.
```json
{
"issueID": "122103968X00620260410"
}
```
### `search_bills`
Search 衆議院議案情報 / 参議院議案情報 by title keyword.
```json
{
"keyword": "情報",
"chamber": "both",
"session": 221,
"limit": 20
}
```
### `get_bill`
Retrieve a bill detail page (proceedings timeline, committee assignment, full-text URL). The `proceedingURL` must be a URL returned by `search_bills` — it is validated against the chamber's allowed path prefix before fetching.
```json
{
"chamber": "shugiin",
"proceedingURL": "https://www.shugiin.go.jp/internet/itdb_gian.nsf/html/gian/keika/1DE..."
}
```
## Data Sources and Attribution
This package uses three Japanese public sources:
- **NDL Kokkai (国会会議録検索システム)** — <https://kokkai.ndl.go.jp/> · [API documentation](https://kokkai.ndl.go.jp/api.html). Diet records published 1947–. No auth required. Be a good neighbour: insert short delays between sequential requests, avoid concurrent bursts.
- **衆議院議案情報** — <https://www.shugiin.go.jp/internet/itdb_gian.nsf/html/gian/menu.htm>
- **参議院議案情報** — <https://www.sangiin.go.jp/japanese/joho1/kousei/gian/index.htm>
Tool results include the source URL. When you publish or redistribute output based on this package, include an appropriate attribution. Suggested:
> 出典: 国会会議録検索システム (https://kokkai.ndl.go.jp/) / 衆議院議案情報 / 参議院議案情報
## Example: pulling a Mythos Q&A
The 4/10 2026 衆議院外務委員会 questioning by 宇佐美登 (チームみらい) on Anthropic's Claude Mythos Preview can be retrieved like this:
```json
{
"tool": "find_diet_qa",
"arguments": {
"keyword": "クロード",
"from": "2026-04-01",
"until": "2026-04-30"
}
}
```
The response includes 花田貴裕 政府参考人's verbatim answer with `meetingURL` pointing to the canonical NDL record at `https://kokkai.ndl.go.jp/txt/122103968X00620260410`.
## Safety Notes
- This package is a **legislative reference tool, not legal/political advice**.
- It does not execute shell commands.
- It writes JSON-RPC messages only to stdout and logs only to stderr.
- It fetches only the NDL Kokkai API and 衆/参 議案情報 endpoints.
- Diet records in NDL typically appear with a 1–2 week lag after the committee meeting. If a recent meeting cannot be found, check back later or consult the chamber's video library directly.
## Related
- Sibling MCP for current laws: [`@codeagentjp/egov-law-mcp`](https://github.com/SHAYOUWORLD/egov-law-mcp)
- Roadmap (法令diff / 自治体条例 / 判例 MCPs): [SHAYOUWORLD/egov-law-mcp#1](https://github.com/SHAYOUWORLD/egov-law-mcp/issues/1)
- Use cases (Japanese): [houan-mcp の7つの実用ユースケース (codeagent.jp)](https://codeagent.jp/posts/houan-mcp-use-cases/)
- From bills to current law (Japanese): [houan-mcpとe-Gov法令MCPの調査フロー (codeagent.jp)](https://codeagent.jp/posts/houan-egov-mcp-research-workflow/)
- Other Japanese public-data APIs and MCP servers: [codeagent.jp/guides/public-data-api/](https://codeagent.jp/guides/public-data-api/)
## License
[MIT](./LICENSE) © codeagent.jp
