Legislation MCP Server

Fetch a single bill by its numeric bill_id (GET /v1/bills/{bill_id}), optionally merging in sub-resources: votes (roll calls with tallies), sponsors, history (action timeline), texts (version metadata), amendments, subjects, analyses (staff analyses), calendar (scheduled events), citations (statutes the bill touches), referrals (committee referrals), sast (same-as / similar-to companion bills in the other chamber or other states), supplements (fiscal notes and summaries). analyses and citations are populated only for the deeper-coverage states. Each include is a separate API call, so ask only for what you need. Pass detail:true to get everything in one round trip instead. Get a bill_id from search_bills or semantic_search_bills. status_id values: 1=Introduced, 2=In Committee, 3=Passed One Chamber, 4=Passed Both Chambers, 5=Signed into Law, 6=Vetoed, 7=Failed/Dead, 8=Chaptered. Aggregate buckets: passed={4,5,8}, failed={6,7}, alive={1,2,3}.

Compare two versions of a bill's text (GET /v1/bills/{bill_id}/diff): a unified diff plus similarity, added/removed line and character counts, and changed-section highlights. Get the two version ids from get_bill with include:['texts'] — each text row's `text_id`. Pass them as `from` (the earlier version) and `to` (the later version). Diffs are precomputed, so only bills that have more than one text version return one.

The sections of existing law a bill amends, creates, repeals or cites (GET /v1/bills/{bill_id}/statutes), classified by how it touches each, with the current text of sections we hold. Use for 'what current law does this bill change'. Get bill_id from search_bills. Only states whose code is loaded resolve to section text (see list_statute_coverage); a link to a section we hold carries resolved:true and the text, otherwise just the citation as written.

The cleaned plain text of one bill-text version (GET /v1/texts/{text_id}), entities decoded, ready to quote or summarize. Get text_id from get_bill with include:['texts'] (each version has a date and type). Texts longer than 40,000 characters are clipped with a '[truncated]' marker.

Timeline of all computed diffs between successive text versions of one bill (GET /v1/bills/{bill_id}/changes): what changed, when, and how much. Use get_bill_diff for one specific pair of versions. Get bill_id from search_bills or semantic_search_bills.

Bill count per status (by:'status', on the status_id ladder) or per subject (by:'subject') for one session (GET /v1/sessions/{id}/status-counts or /subject-counts). Get session_id from list_sessions. status_id values: 1=Introduced, 2=In Committee, 3=Passed One Chamber, 4=Passed Both Chambers, 5=Signed into Law, 6=Vetoed, 7=Failed/Dead, 8=Chaptered. Aggregate buckets: passed={4,5,8}, failed={6,7}, alive={1,2,3}.

Headline counts for one legislative session (GET /v1/sessions/{id}/dashboard): bills filed, passed, signed, vetoed, roll calls, active legislators. Start here for 'how is the 2026 Florida session going'. Get session_id from list_sessions.

Legislators ranked by bills sponsored and passed in one session (GET /v1/sessions/{id}/sponsor-stats). Each row has bills_sponsored, bills_primary, bills_passed, bills_primary_passed and pass_rate (passed = status 4, 5 or 8). This is the one call for 'who is most active or effective this session' and 'which senator passed the most bills': set chamber and sort:'passed' (or 'primary_passed' to count only bills they carried). Committees filed as sponsors are excluded by default. Get session_id from list_sessions.

How many roll calls each legislator voted in versus missed during one session (GET /v1/sessions/{id}/vote-participation). Use for attendance questions. Get session_id from list_sessions.

Every legislator who served in one session (GET /v1/sessions/{id}/legislators), with people_id. Use list_legislators for the current roster by state; use this for a specific past or special session. Get session_id from list_sessions.

Bills whose LATEST action in the window falls in a stage (GET /v1/bills-by-stage): introduced, committee, passed, executive (with the governor, signed, or vetoed), amendments, other. Fleet-wide across all jurisdictions — there is no state filter, so filter the rows by state_id or state_name yourself. Classified from the action text, not status_id. Use for 'what passed this week' or 'what reached the governor'. Stage values are lowercase.

Search or list legislation with structured filters (GET /v1/bills). Use this when you know the jurisdiction, sponsor, topic, or status you want. Every filter is optional and they combine with AND. A bill number typed into q (e.g. 'HB 1', 'SB0002') matches that bill directly. Returns bill summaries plus pagination; call get_bill for the full record. Corpus is 2026-forward only. status_id values: 1=Introduced, 2=In Committee, 3=Passed One Chamber, 4=Passed Both Chambers, 5=Signed into Law, 6=Vetoed, 7=Failed/Dead, 8=Chaptered. Aggregate buckets: passed={4,5,8}, failed={6,7}, alive={1,2,3}.

Fetch one election candidate by id (GET /v1/candidates/{id}): their party, office, district and cycle, plus an FEC filer id where the campaign has filed and a Bioguide id for sitting members of Congress. When people_id is set, the candidate has a legislative voting record — pass it to get_legislator or get_legislator_scorecard to go from candidate to voting history in one hop. Get an id from list_candidates.

The URL of a candidate's official portrait (GET /v1/photos/{candidate_id} returns the image bytes). Sources are official state-legislature and congressional portraits, public-domain and licensed images only — never a third party's photo library — and each carries a license and attribution string that MUST be shown when the license requires it (Wikimedia CC BY). Returns null when the candidate has no accepted portrait — which is the COMMON case: only about a tenth of the 2026 field has one (11%), so design for an initials-avatar default. Candidate rows from list_candidates and get_midterms already include photo_url, so call this only when you have just an id.

Fetch a legislator's profile by people_id (GET /v1/legislators/{people_id}), optionally merging in votes (every roll call they are recorded on, newest first, with their individual position: 1=Yea, 2=Nay, 3=Not Voting, 4=Absent) and bills (legislation they sponsor, with sponsor_type_id 1=primary, 2=cosponsor). Find a people_id with list_legislators or from a bill's sponsors. Corpus is 2026-forward only.

One-call voting and sponsorship profile for a legislator (GET /v1/legislators/{people_id}/scorecard): participation, party-line alignment, bills sponsored and passed, notable votes. This is the tool for 'how does X vote' or 'is X effective'. Get people_id from list_legislators (q=name).

One section of law with full text and its place in the code (GET /v1/statutes/sections/{section_id}, or by citation via GET /v1/statutes/lookup). Give section_id from a search or a bill/measure link, or state + citation exactly as the code prints it (e.g. '39:4-50', '790.01', '18-3-102'). Set include_bills:true to also return the bills that amend, create, repeal or cite the section. Only states whose code is loaded resolve to section text (see list_statute_coverage); a link to a section we hold carries resolved:true and the text, otherwise just the citation as written.

Which jurisdictions' codified law is loaded, and how big and current it is (GET /v1/statutes/coverage): per state the number of codes, sections, bill links and the edition it is current through. Pass state to list that state's codes (GET /v1/statutes/codes) — the code_id values used by get_statute lookups. Call this first to know whether a state's statutes are available.

Ballot measures (GET /v1/measures): the list for a state, or one measure by its number (e.g. 'Amendment 1') with full text, summary and official source URL. Use for 'what's on the ballot in X' and 'what does Amendment N do'.

Search the election-candidate directory (GET /v1/candidates): people running for office. Filters combine with AND. Roughly a third carry an FEC filer id and sitting members of Congress carry a Bioguide id; both are null otherwise. Rows also carry people_id where the person has a legislative voting record — pass it to get_legislator / get_legislator_scorecard to go from candidate to voting history in one hop. Covers STATE and federal candidates. Pass a candidate id to get_candidate for the full record.

Near-real-time feed of what changed (GET /v1/changes). Poll with since=<ISO timestamp> to get everything newer than your cursor; with no since it defaults to the last hour. Reason types include NewBill, StatusChange, Text, Vote and Amendment. Use this for monitoring and incremental sync — 'what moved in Florida since yesterday' — rather than re-scanning search_bills.

Fetch a committee by committee_id (GET /v1/committees/{committee_id}), optionally merging in members (its roster, with roles) and hearings (its scheduled meetings). Find a committee_id with list_committees.

List legislative committees (GET /v1/committees), filterable by jurisdiction, chamber, or name search. Returns the committee_id values that get_committee needs.

Per-state depth snapshot (GET /v1/coverage): how COMPLETE each jurisdiction's data is — bill counts, the share of bills holding at least one vote, text or sponsor, and whether the legislature is currently in session. Use it before drawing conclusions from a thin result set, to tell 'no such bills' apart from 'this state is thinly covered'. Read the completeness ratios rather than the raw percentages: most bills die in committee without ever getting a roll call, so a low pct_with_votes usually reflects the legislature, not a gap in the data. Served from a materialised snapshot; `computed_at` gives its age.

District metadata by state and type (GET /v1/districts): congressional, state senate, state house. Pass district_id with boundary:true to get the polygon as GeoJSON (GET /v1/districts/{id}/boundary) — it is large, so set simplify (degrees, e.g. 0.01) to shrink it. Match districts NUMERICALLY (district_number), never by label text.

Scheduled committee hearings across committees (GET /v1/hearings), filterable by jurisdiction and start date. Use this to answer 'what is being heard this week' or to track when a committee next meets. For hearings on one specific committee use get_committee with include:['hearings']; for one specific bill use get_bill with include:['calendar'].

Keyword search where EVERY term must appear (GET /v1/search/bills). Use when the user gives specific words that all have to be present, e.g. ['short-term rental', 'tax']. Prefer semantic_search_bills for questions and search_bills for structured filters. Up to 10 terms. Returns bill summaries plus pagination. Corpus is 2026-forward only.

Search or list legislators (GET /v1/legislators) by jurisdiction, chamber, party, district, or name. This is how you turn a name into the people_id that get_legislator needs. Filters combine with AND.

Manage the key's webhook subscriptions (/v1/webhooks). action:'list' is read-only. 'create' REGISTERS a URL that Delilah will POST to on the chosen events — it changes the account, so it requires confirm:true and the user's explicit go-ahead. 'test' queues a sample delivery to an existing subscription. 'delete' removes one (confirm:true). Events: bill_introduced, status_change, vote_recorded, text_updated, passed, vetoed, signed, amendment_added. Optional filters: states (postal codes), subjects.

The sections of existing law a 2026 ballot measure amends, creates, repeals or cites (GET /v1/measures/{state}/{number}/statutes). Use for 'which laws does Prop X / Question Y change'. Read from the measure's official text: constitutional amendments cite the constitution (not loaded), and a measure whose text is not yet published returns nothing. Treat the list as a floor. Only states whose code is loaded resolve to section text (see list_statute_coverage); a link to a section we hold carries resolved:true and the text, otherwise just the citation as written.

The election slate for 2026-11-03 (GET /v1/midterms): races, candidates and ballot measures per state, with official results where available. All data is official state election-office and FEC content collected by Delilah — no third-party attribution is required. live_results carries ONE ENTRY PER CONTEST, each with `contest` (e.g. primary:DEM, runoff:REP) and `party`: a closed primary returns each party separately and vote_pct is the share of THAT party's ballot, so never compare or rank candidates across two contests. Use for 'who is running for X' and results questions. Never call or project a race; report counts exactly as reported.

Fetch a roll call by roll_call_id (GET /v1/votes/{roll_call_id}): the motion, chamber, date and yea/nay/absent tallies. Add include:['details'] to also pull how every individual member voted (vote_id 1=Yea, 2=Nay, 3=Not Voting, 4=Absent) — this is the tool for 'how did each legislator vote on this'. Get a roll_call_id from get_bill with include:['votes'].

Vector search over the full text of every bill (GET /v1/search/semantic): describe what you want in plain English — 'protecting kids from social media', 'limits on rent increases' — and get the closest bills with a match_score. Prefer this over search_bills for questions and topics; prefer search_bills for a known bill number, sponsor, or status filter, and keyword_search_bills for exact terms that must all appear. Returns bill_id, bill_number, title, description, state_abbr, status_id. Corpus is 2026-forward only. status_id values: 1=Introduced, 2=In Committee, 3=Passed One Chamber, 4=Passed Both Chambers, 5=Signed into Law, 6=Vetoed, 7=Failed/Dead, 8=Chaptered. Aggregate buckets: passed={4,5,8}, failed={6,7}, alive={1,2,3}.

Legislative sessions (GET /v1/sessions): regular and special sessions with their years, start/sine-die dates and a session_id. Use this to resolve which session a bill belongs to, to find the current session for a state, or to pass session_id as a filter to search_bills. Omit `state` to list every jurisdiction's sessions. Corpus is 2026-forward only.

The jurisdiction directory (GET /v1/states): the 50 states, D.C. and the U.S. Congress with their state_id, 2-letter code and full name. Returns the full list (52 rows) so you can resolve a name to a code or enumerate everything the corpus covers. For how COMPLETE each jurisdiction's data is, use get_coverage instead.

Full-text search of a state's codified law (GET /v1/statutes/search). Use for 'what does the law say about X' and to find the section a bill or ballot measure changes. Returns matching sections with headings and excerpts; fetch the whole section with get_statute. Only states whose code is loaded resolve to section text (see list_statute_coverage); a link to a section we hold carries resolved:true and the text, otherwise just the citation as written.

The raw subject taxonomy with per-subject bill counts (GET /v1/subjects). Subjects are the fine-grained categories the legislatures themselves assign to bills — narrower and more numerous than the curated topic slugs from list_topics. Use this to find a subject_id to filter search_bills by, or to gauge what a jurisdiction is legislating on. Scope with `state` and narrow with `q`.

The canonical topic taxonomy with per-topic bill counts (GET /v1/topics). Call this first to find the right slug for the topic filter on search_bills, instead of guessing one. Pass a slug to get that topic's detail and a sample of the raw subject names folded into it (GET /v1/topics/{slug}); to get the topic's actual bills, use search_bills with topic=<slug>.

Bills with the most news coverage in the window (GET /v1/trending), optionally for one state. Use for 'what's in the news' or 'hot bills right now'. Returns bill summaries with mention counts; call get_bill for detail.

The current key's tier, monthly cap, requests used and remaining, and when the period resets (GET /v1/_meta/usage). Call this when a request is rate-limited (HTTP 429) or the user asks about their plan.

One row per stage with the number of bills whose latest action landed there in the window (GET /v1/bills-weekly-breakdown). All jurisdictions combined. Use for a national 'how much moved this week' number; use get_session_dashboard for one state.