org.billcommons/bill-commons

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Search 209k+ US state bills, all 50 states + DC: full text, sponsors, votes, status. Free.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "bill-commons": {
      "url": "https://mcp.billcommons.org/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (10)

• search_legislation read-only

  Search FULL BILL TEXT -- not just known-bill-number lookup. `q` is matched against titles, descriptions, AND ingested document text via Postgres websearch_to_tsquery (supports "quoted phrases", OR, and -exclusion, same syntax as a search engine), with a fuzzy pg_trgm title-similarity fallback when the exact query has no hits. `q` can ALSO be a bill number ("HB 123", "H.B. 123", "hb123" all match) and that fast path is tried first. Optionally filter by jurisdiction (two-letter state code or name), chamber, and status. For a curated cross-state slice of a subject (e.g. "every AI bill in the country") rather than an ad-hoc keyword search, call list_topics first -- its membership rules also match on structured subject tags this full-text search does not see.

  Parameters:

  • q (required) — string
  • limit
  • status
  • chamber
  • jurisdiction

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• get_bill_record read-only

  Fetch the full record for one bill: metadata, sponsors, subjects, actions, versions, and vote-event summaries. Look up by canonical bill_id (UUID), or by jurisdiction + identifier (+ optional session to disambiguate). For a human bill number like HB 123, use jurisdiction="NC", identifier="HB 123"; bill_id is for UUIDs.

  Parameters:

  • bill_id
  • session
  • identifier
  • jurisdiction
  • include_full_text — boolean

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• compare_bill_versions read-only

  Deterministic diff (unified + structured) between two versions of a bill's extracted text. Defaults to earliest vs. latest texted version if version ids are omitted. Errors if fewer than 2 versions have extracted text. Result is labeled 'derived' (computed by Bill Commons, not an official document).

  Parameters:

  • bill_id (required) — string
  • version_id_a
  • version_id_b

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• find_similar_bills read-only

  Find bills with similar titles via deterministic trigram similarity, across jurisdictions. Labeled 'derived' -- not an official cross-reference or companion-bill designation.

  Parameters:

  • bill_id (required) — string
  • limit

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• get_vote_details read-only

  Fetch vote event(s) with member-level (yes/no/other/absent) vote records. Provide vote_event_id for one vote, or bill_id for all recorded votes on that bill.

  Parameters:

  • bill_id
  • vote_event_id

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• trace_legislative_history read-only

  Full chronological legislative history for a bill: merged timeline of actions, version publications, and votes, plus related-bill links.

  Parameters:

  • bill_id (required) — string

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• build_legislative_evidence_packet read-only

  Compile a citation-ready evidence packet for a bill: full official record, legislative history timeline, votes with member-level detail, and hearings -- each explicitly labeled official vs. derived with source URLs. Returns a `how_to_cite` block with a one-line `cite_as` sentence, a human `permalink`, a JSON `download_url`, and a `snapshot_id` that changes if and only if a cited fact about the bill changes -- so a reader can check later whether the citation still holds. Snapshots are NOT archived; the id is a change detector, not a way to retrieve an older packet. Pass `question` to record what the packet was assembled to answer; it is echoed into the artifact so a filed packet carries its own scope.

  Parameters:

  • bill_id (required) — string
  • question
  • include_full_text — boolean

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• get_jurisdiction_coverage read-only

  Return the jurisdiction_coverage state-machine status for one state (abbreviation or name), or the full stored coverage matrix if state is omitted. Public-registry and unlisted row counts are explicit. Includes bounded retained official-source observation health and evidence links. Coverage status measures stored bill/text availability; local coverage timestamps can advance on count recomputation. Statewide semantic freshness remains unverified, including for GREEN coverage.

  Parameters:

  • state

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• get_active_sessions read-only

  List legislative sessions currently flagged active, optionally filtered by jurisdiction (two-letter state code or name).

  Parameters:

  • jurisdiction

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• list_topics read-only

  List Bill Commons' curated cross-state topic trackers (e.g. artificial intelligence, youth online safety, platform accountability, cybersecurity, cryptocurrency, data privacy, local government & preemption) -- the entry point for "what subjects does Bill Commons track across all 50 states + DC" and "how do I get every bill in one". Each topic is a title/subject membership rule tuned for precision over recall, with a live bill_count and how_to_fetch_bills. This tool does not itself return bill rows -- pair it with search_legislation or the REST API's /topics/{slug} for the bills.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

Publisher website Repository

Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.