UK Parliament Treaties MCP Server

Summary

This MCP server provides structured access to UK Parliament Treaties data using the Model Context Protocol. It enables AI agents to retrieve treaties, business items, and government organisations through API-backed tools and data access. Developers can integrate the MCP server via stdio transport to query treaty metadata, series memberships, and parliamentary process status. The server exposes tools that map directly to the Treaties API for reliable automation and AI agents workflows.

Features

• Search treaties with filters for house, series, and parliamentary process status.
• Retrieve treaty and business item details by ID.
• Access government organisations and series memberships.
• Preserve upstream payloads in a standardized envelope for downstream tools.

Available Tools

get_business_item_by_id

Returns business item by ID.

Parameters:

• id (string, path)

list_government_organisations

Returns all government organisations.

list_series_memberships

Returns all series memberships.

list_treaties

Returns a list of treaties.

Parameters:

• SearchText (string, query)
• GovernmentOrganisationId (number, query)
• Series (string, query) – CountrySeriesMembership | EuropeanUnionSeriesMembership | MiscellaneousSeriesMembership
• ParliamentaryProcess (string, query) – NotConcluded | Concluded
• DebateScheduled (boolean, query)
• MotionsTabledAboutATreaty (boolean, query)
• CommitteeRaisedConcerns (boolean, query)
• House (string, query) – Commons | Lords
• Skip (number, query)
• Take (number, query)

get_treaty_by_id

Returns a treaty by ID.

Parameters:

• id (string, path)

list_business_items_by_treaty_id

Returns business items belonging to the treaty with ID.

Parameters:

• id (string, path)

Example Output

{
  "status": 200,
  "data": {
    "items": [
      {
        "treatyId": "CP123",
        "title": "Example Treaty",
        "house": "Commons"
      }
    ],
    "totalResults": 1
  },
  "upstream_path": "/api/Treaty",
  "retrieved_at": "2026-03-11T10:00:00.000Z"
}

Quick Start

Run the MCP server using npx:

npx -y -p @darkhorseone/mcp-server-uk-parliament-treaties mcp-server-uk-parliament-treaties

MCP Configuration

Example mcpServers configuration for stdio transport:

{
  "mcpServers": {
    "uk-parliament-treaties": {
      "command": "npx",
      "args": ["-y", "-p", "@darkhorseone/mcp-server-uk-parliament-treaties", "mcp-server-uk-parliament-treaties"],
      "env": {
        "UPSTREAM_BASE_URL": "https://treaties-api.parliament.uk",
        "REQUEST_TIMEOUT_MS": "10000"
      }
    }
  }
}

Example Usage

• Search treaties by house and parliamentary process status.
• Fetch a treaty by ID and review its metadata.
• Retrieve business items linked to a treaty.
• List government organisations associated with treaties.

Use Cases

• AI agents summarizing treaty status and parliamentary scrutiny.
• Research tools tracking treaty processes and schedules.
• Civic tech platforms monitoring treaties by government body.
• Automation workflows exporting treaty metadata for analysis.

Data Source

UK Parliament Treaties API https://treaties-api.parliament.uk

Installation

Run directly using npx:

npx -y -p @darkhorseone/mcp-server-uk-parliament-treaties mcp-server-uk-parliament-treaties

Or install via pnpm from the repository root:

pnpm install

Run (HTTP proxy server)

Build first, then start:

pnpm --filter @darkhorseone/mcp-server-uk-parliament-treaties run build
pnpm --filter @darkhorseone/mcp-server-uk-parliament-treaties run start:http

Set a custom HTTP port with the UKP_HTTP_PORT environment variable (default: 8787):

UKP_HTTP_PORT=8787 pnpm --filter @darkhorseone/mcp-server-uk-parliament-treaties run start:http

Published package command:

npx -y -p @darkhorseone/mcp-server-uk-parliament-treaties -- mcp-server-uk-parliament-treaties-http

If your shell cannot resolve the bin ("command not found"), run the HTTP entrypoint directly:

npx -y -p @darkhorseone/mcp-server-uk-parliament-treaties -- node ./dist/http.js

Health check:

curl http://127.0.0.1:8787/healthz

Proxy pattern:

GET /proxy/<upstream-path>?<query>

Example:

curl "http://127.0.0.1:8787/proxy/api/Treaty?House=Commons&Take=10"

License

MIT License

MCP Metadata

Protocol: Model Context Protocol Transport: stdio Tools: get_business_item_by_id, list_government_organisations, list_series_memberships, list_treaties, get_treaty_by_id, list_business_items_by_treaty_id