@pipeworx/congress-member-votes

Connect: https://pipeworx.io/mcp — every tool in the catalog, including @pipeworx/congress-member-votes’s. Install: one-click buttons

No MCP client? Skip the connection: POST https://gateway.pipeworx.io/v1/tools/search_packs {"query":"..."} to find a tool below, GET /v1/tools/<name> for its schema, POST the same URL with arguments for the data — see For AI agents.

Tools: 3

How each U.S. House member and senator voted, how often they were there, and how often they vote with their party — House from the U.S. House Clerk’s roll-call votes, Senate from the Congressional Record (U.S. Government Publishing Office).

Tools

• member_vote_positions(chamber?, bioguide_id | name [+ state], bill?, question_contains?, from_roll?, to_roll?, limit?, congress?, session?) — one member’s position (Yea, Nay, Present, Not Voting, or not on the roll) on roll calls, newest first. Answers “how did Rep. X vote on bill Y”.
• member_attendance_party_line(chamber?, bioguide_id | name [+ state], from_roll?, to_roll?, congress?, session?) — attendance and party-line share for one member over a session or roll range. Every figure carries its denominator and exclusions; a figure that cannot be computed is null with a stated reason, never 0% or 100%.
• roll_call_positions(chamber?, roll_number, party?, state?, position?, congress?, session?) — every member’s position on one roll call, with party tallies.

What the derived figures mean

• Attendance denominator: recorded roll calls in the range on which the member was on the roll. Quorum calls and Speaker elections are excluded (and counted in excluded_rolls). attended = Yea + Nay + Present; missed = Not Voting.
• Not on the roll is not Not Voting. A member absent from a roll entirely (not yet seated, or already gone) is excluded from the denominator and counted separately as not_on_roll_excluded.
• with_party_majority: of the member’s Yea/Nay votes, the share matching what a strict majority of their own party’s Yea/Nay voters did. Includes lopsided votes, so it runs high. Party-tied rolls are excluded and counted.
• party_unity: the same, restricted to rolls where a majority of Democrats opposed a majority of Republicans.
• The Speaker is listed on a roll only when voting, so a Speaker’s missed-vote count cannot be derived; attendance is returned as null with that reason (party-line is still computed over the votes cast).
• Party is the member’s party at their latest roll call. Independents have no D-versus-R majority, so no party-line figure is computed for them.

Auth

Keyless for the House. The Senate’s live top-up uses the api.data.gov key the gateway supplies; without it the Senate answers from the stored rolls and says so in live_topup.

Coverage

119th Congress, sessions 1 and 2, both chambers (chamber: "house" is the default; "senate" for the Senate). Other Congresses return a named reason.

Senate. The Secretary of the Senate’s own site refuses automated requests (HTTP 403 from a web-application firewall, root page included, 2026-10-23), so the Senate’s roll calls are taken from the Congressional Record, which prints each one with its Yeas / Nays / Present / Not Voting lists. Those lists carry surnames, not ids, so each name is resolved to a bioguide id against the congress-legislators roster. A Senate roll is kept only when

• the Yeas and Nays lists match the counts the Record announces, in two places (the announcement and the list headings);
• every name resolves to exactly one senator seated that day, and no senator is listed twice;
• the number of names equals the number of senators seated that day.

A roll that fails any of these is kept as a numbered placeholder (record not derivable, with the reason in its description), counted in excluded_rolls.not_derivable_rolls, and never used in a figure. The bake refuses to write a session whose roll numbers have an unexplained hole.

What the Senate figures mean differently from the House:

• The Senate prints a NOT VOTING list on every roll, so a senator absent from a vote is Not Voting and counts as missed; a senator not yet seated (or already gone) appears on no list and is excluded and counted as not on the roll.
• A Vice President tie-breaking vote is not a senator’s position and is in no figure; the roll’s description names it.
• The two independents who caucus with the Democrats are party I: they are not counted in the Democratic majority, and their own party-line figure is null with a stated reason.
• result is the Record’s own outcome sentence, or null with a note when the Record has none this tool can match; it is never inferred from the tally.
• date is the Record’s issue date, i.e. the Senate’s legislative day: a day that runs past midnight is printed under the earlier date (the 1 July 2025 vote on H.R. 1 is under 30 June).

Data sources

• U.S. House Clerk, roll-call votes. US federal data, public domain.
• U.S. Government Publishing Office, Congressional Record (Senate roll-call votes), with the roster from the congress-legislators project (public domain). US federal data, public domain.

Rolls are held as a compact member-by-roll table, generated by scripts/bake-congress-member-votes.mjs (the refresh path), uploaded at deploy and injected into the pack (pack-baked-indexes.json). Rolls newer than the table are read live on each call (up to 40; from the Clerk for the House, from the Congressional Record for the Senate), so every response states the last roll it covers (rolls_covered), how many were added live (live_topup) and data_as_of. If the live read fails the response says so and covers only the stored rolls.

The Clerk answers a roll that does not exist with an HTTP 200 stub rather than a 404; the pack treats that as “no such roll” and any other non-record body as a fault.

Tools

• member_vote_positions — ANSWERS “how did Rep. X vote on bill Y” / “what were X’s last 20 votes” / “did X vote against the budget resolution” — one member’s recorded position (Yea, Nay, Present, Not Voting, or not on the rol
• member_attendance_party_line — ANSWERS “how many votes did Rep. X miss”, “how often does X vote with their party”, “party unity score” — attendance and party-line share for ONE member (House, or a senator with chamber “senate”) ov
• roll_call_positions — ANSWERS “who voted against roll call 100”, “how did Texas Republicans split on roll 250”, “how many Democrats voted Yea” — every member’s position on ONE roll call (House: the U.S. House Clerk’s roll