ecfr

Free, open-source MCP servers for federal contracting: SAM.gov, USAspending, GSA CALC+, eCFR, Federal Register, and more. 5,439 collected regression tests. In the Claude and ChatGPT directories.

Life-sciences CSV & GxP toolkit for Claude Code — GAMP 5, 21 CFR Part 11, EU GMP Annex 11, the live eCFR & openFDA, and an IQ/OQ/PQ qualification engine. Slash commands, auto-invoked skills, parallel sub-agents, an MCP server, and a document-protection hook.

MCP server for the US Code of Federal Regulations — look up, search, and track changes to CFR sections via the eCFR API

Export Control Engine for AI Agencies (Claude, OpenAI, On-Prem)

Paste a chemical manifest and watch an agent load a truck legally. The page shows which federal rule each pair breaks, quoted verbatim, and the shipping paper cannot be exported until the load passes. WebMCP + 49 CFR 177.848.

Non-preferential US rules of origin (19 CFR 102.20 / 102.21) compiled from the eCFR into a machine-readable corpus. Answers which country a good is legally from, and cites the rule.

LexBuild provides an open-source CLI toolchain, searchable web resource, and data API for official U.S. legal texts. The CLI generates LLM-ready legal Markdown documents, the web app enables browsing and bulk download access, and the API provides programmatic access to fast, structured querying for search, filtering, and AI workflows

Search and trace US federal rules across the Federal Register (proposed/final rules and notices), the eCFR (codified, point-in-time CFR full text, locally mirrored), and Regulations.gov (rulemaking dockets and public comments) via MCP. STDIO or Streamable HTTP.

Local-first eCFR analytics dashboard for agency-level burden, change volatility, and audit-ready text metrics.

Detects real change in the Department of Education's machine-readable rules and emits a cryptographically signed .aion chain

Verify, navigate and compute U.S. federal tax law. Checks citations and quotations against the Code, Treasury Regulations, IRS guidance and case law; navigates the consolidated return regs; computes I.R.C. § 382 limitations, § 382(g) owner shifts and § 381 carryover — every answer traced to authority. MCP server + CLI. Not tax advice.

Search and read US federal regulations with legal citations and ecfr.io source links

eCFR (Electronic Code of Federal Regulations) MCP.