congressgov-mcp-server

Eleven read-only tools for querying U.S. legislative data:

Browse and retrieve U.S. legislative bill data from Congress.gov.

- Filter by congress number, bill type, and update-date range
- Retrieve detailed sub-resources: actions, amendments, committees, cosponsors, related bills, subjects, summaries, text versions, and titles
- contentreads a text version's actual document text, a bounded character window at a time — pick the version withtextVersionIndex, the window withcharacterOffset/characterLimit, and follownextOffsetto walk a full bill
- listdefaults toorder='recent'(newest update-date first); passorder='oldest'for ascending
- Pagination support for browsing large result sets

Discover congressional members and their legislative activity.

- Browse by state, district, congress number, and chamber
- Retrieve a member's sponsored and cosponsored legislation
- Look up specific members by bioguide ID

Browse congressional committees and their legislation, reports, and nominations.

- Filter by chamber (House, Senate, Joint)
- Retrieve committee bills, reports, and nominations
- Detail and sub-resource lookups need onlycommitteeCode—chamberis auto-detected from the code
- Committee bills default toorder='recent'(newest-first); passorder='oldest'for ascending update-date order

Retrieve House and Senate roll call votes and individual member voting positions.

- Setchambertohouse(default, from the Congress.gov API) orsenate(from the Senate's official LIS feed — the API exposes no Senate votes)
- listbrowses votes by congress and session, newest first; passorder='oldest'for ascending
- getreturns the question, result, tallies, party breakdown, and associated bill/nomination/amendment
- membersreturns each member's recorded position

- Filter by congress and bill type
- Browse chronologically to see what's moving through Congress

Browse and retrieve CRS reports — nonpartisan policy analyses written by subject-matter experts at the Library of Congress.

- Browse the full report catalog
- Retrieve individual reports by product number

Browse the daily Congressional Record — floor speeches, debates, and legislative text published each day Congress is in session.

- Browse volumes by congress number
- Retrieve specific issue articles
- contentreads one article's actual text, selected byarticleIndexand bounded bycharacterOffset/characterLimit

Keyword-search bill titles and CRS summaries against a local full-text mirror — the discovery path the Congress.gov API itself lacks.

- Opt-in:off by default, and not offered to clients untilCONGRESS_MIRROR_ENABLED=true. With the flag set but the index not yet built (bun run mirror:init), the tool is callable and answers with an empty result and a build-the-index notice
- Narrow withcongress,billType, andoriginChamberfilters
- Returns BM25-ranked matches with each bill's derived id, ready for a follow-upcongressgov_bill_lookupcall

- Declarative tool definitions — single file per tool, framework handles registration and validation
- Unified error handling across all tools
- Pluggable auth (none,jwt,oauth)
- Swappable storage backends:in-memory,filesystem,Supabase
- Structured logging with optional OpenTelemetry tracing
- Runs locally (stdio/HTTP) or in Docker from the same codebase

A public instance is available athttps://congressgov.caseyjhand.com/mcp— no installation required. Point any MCP client at it via Streamable HTTP:

{ "mcpServers": { "congressgov-mcp-server": { "type": "streamable-http", "url": "https://congressgov.caseyjhand.com/mcp" } } }

Add the following to your MCP client configuration file.

git clone https://github.com/cyanheads/congressgov-mcp-server.git

All configuration is validated at startup via Zod schemas insrc/config/server-config.ts. Key environment variables:

bun run rebuild bun run start:http # or start:stdio

bun run devcheck # Lints, formats, type-checks bun run test # Runs test suite

docker build -t congressgov-mcp-server . docker run -e CONGRESS_API_KEY=your-api-key -p 3010:3010 congressgov-mcp-server

- Handlers throw, framework catches — notry/catchin tool logic
- Usectx.logfor logging,ctx.statefor storage
- All tools are read-only withreadOnlyHint: trueandidempotentHint: true

Issues and pull requests are welcome. Run checks and tests before submitting:

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