regulationsgov-mcp

MCP server for the Regulations.gov API. Federal rulemaking dockets, proposed rules, final rules, public comments, and comment period tracking.

Optional free API key for higher rate limits.

Tested and hardened through three rounds of integration testing against the live Regulations.gov API. 51 regression tests covering 1 P0 catastrophic bug, 10 P1 silent-wrong-data bugs (including agency_id="" returning all 1,951,938 records), and 7 P2 validation gaps fixed. See TESTING.md for the full testing record.

What it does

Exposes the Regulations.gov API as 8 MCP tools:

Core

• search_documents - Search proposed rules, final rules, notices with flexible filters
• get_document_detail - Full document details with optional attachments
• search_comments - Search public comments (by docket, document, or keyword)
• get_comment_detail - Full comment text and submitter info
• search_dockets - Search rulemaking and nonrulemaking dockets
• get_docket_detail - Docket metadata, abstract, and RIN

Workflow

• open_comment_periods - Currently open comment periods across procurement agencies
• far_case_history - Full lifecycle of a FAR/DFARS rulemaking case

Get your own API key (strongly recommended)

This server hits api.regulations.gov, which uses api.data.gov for rate limiting.

• Without a key: falls back to the shared DEMO_KEY which is capped at 40 requests per hour across everyone using it. A single open_comment_periods scan across 8 agencies already uses 8 of those 40, so you'll hit 429 errors within a couple of prompts.
• With a personal key: 1,000 requests per hour, yours alone.

Get a free key (takes 30 seconds):

1. Go to open.gsa.gov/api/regulationsgov/#getting-started (or directly at api.data.gov/signup)
2. Enter your name and email — no approval, no wait
3. Copy the key from the confirmation page
4. Paste it into your Claude Desktop config as REGULATIONS_GOV_API_KEY (see below)

The same api.data.gov key works for every api.data.gov-backed API (Regulations.gov, GSA Per Diem, NASA, FEC, FCC, etc.), so if you already have one for another 1102tools MCP you can reuse it.

Installation

uvx regulationsgov-mcp

Claude Desktop configuration

Recommended (with your own key):

{
  "mcpServers": {
    "regulationsgov": {
      "command": "uvx",
      "args": ["regulationsgov-mcp"],
      "env": {
        "REGULATIONS_GOV_API_KEY": "paste-your-api-data-gov-key-here"
      }
    }
  }
}

Without a key (works for a handful of calls per hour, then 429s until the hour rolls over):

{
  "mcpServers": {
    "regulationsgov": {
      "command": "uvx",
      "args": ["regulationsgov-mcp"]
    }
  }
}

Example prompts

• "What FAR cases have open comment periods right now?"
• "Show me the full docket history for FAR-2023-0008."
• "Find all proposed rules from DARS posted in the last 6 months."
• "How many public comments were submitted on FAR Case 2023-008?"
• "Search for rulemaking dockets related to cybersecurity at DoD."
• "Find all SBA rules about size standards from the last year."

Important: case-sensitive filter values

Regulations.gov filter values are CASE-SENSITIVE. Use exact casing:

• Document types: Proposed Rule, Rule, Notice (not lowercase)
• Docket types: Rulemaking, Nonrulemaking
• Lowercase values silently return 0 results with no error

Companion tools

• federal-register-mcp: what was published in the Federal Register
• regulationsgov-mcp: the docket structure, public comments, and comment period status
• ecfr-mcp: what the regulation currently says after amendments

Together these three cover the full regulatory pipeline from proposal through public comment to codified rule.

License

MIT