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us-eli-mcp

by matematicsolutions
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Python
Remote

us-eli-mcp

MCP server for US law with verifiable citations. Five sources behind ten read-only tools:

  • Congress.gov API - the federal legislative process: bills as they move through committees and floor votes.

  • GovInfo API - enacted law text as published packages: US Code, Statutes at Large, CFR annual editions, Federal Register issues.

  • Federal Register API - full-text search over 1,003,504 FR documents (1994-2026, live-verified 2026-07-07), including 8,513 presidential documents (1,550 executive orders). Keyless.

  • CourtListener search API - full-text search over 8,294,123 court opinions (live-verified 2026-07-07). The headline value is STATE case law (California, New York, Texas, ...), which no federal source covers. Keyless, ~5 requests/min anonymous.

  • eCFR API - the CURRENT Code of Federal Regulations: section-level full-text search over 412,846 sections plus per-section amendment history. Keyless.

What this is not

  • State legislation (all 50 states) - see LegiScan, a free-tier aggregator (30,000 queries/month) not wrapped here.

  • A federal case-law workhorse - for heavy federal case-law research the mature MIT-licensed wrappers (blakeox/courtlistener-mcp, john-walkoe/courtlistener_citations_mcp) remain the recommendation; the case-law tools here exist primarily for state courts. See SOURCES.md.

Related MCP server: CongressMCP-full

Tools

Tool

Purpose

us_search_bills

List bills by congress (e.g. 118) and type (hr, s, hres, ...)

us_get_bill

Full detail + latest action for one bill

us_list_code_packages

List GovInfo packages in a collection (USCODE, CFR, FR, STATUTE)

us_get_code_package

Metadata + download links (PDF/XML/TXT) for one package

us_search_federal_register

Full-text search over FR documents; filter rules, notices, executive orders

us_get_federal_register_doc

One FR document with its official citation (e.g. 91 FR 41591)

us_search_case_law

Full-text search over 8M+ opinions; court filter (e.g. cal, ny, scotus)

us_get_case

One opinion cluster by cluster_id

us_search_cfr_sections

Full-text search over the current CFR (eCFR)

us_get_cfr_section_history

Amendment history of one CFR section (e.g. 15 CFR 744.3)

Every response carries lex_uri (a resolvable API URL), human_readable_citation (the official convention: "H.R. 1, 118th Congress", "91 FR 41591", "People v. Miranda-Guerrero, 519 P.3d 1004 (California Supreme Court 2022)", "15 CFR § 744.3") and source_url (the public page). Reporter citations are taken verbatim from the source and never fabricated; when none exists the docket number is used instead.

Install

pip install us-eli-mcp

Configuration

Env var

Default

US_ELI_API_KEY

DEMO_KEY (shared, low rate limit - get your own free key at api.congress.gov/sign-up)

US_ELI_GOVINFO_API_KEY

reuses US_ELI_API_KEY (same api.data.gov key family)

US_ELI_CACHE_DIR

~/.matematic/cache/us-eli

US_ELI_AUDIT_DIR

~/.matematic/audit

US_ELI_BASE_URL

https://api.congress.gov/v3

US_ELI_GOVINFO_BASE_URL

https://api.govinfo.gov

US_ELI_FR_BASE_URL

https://www.federalregister.gov/api/v1 (keyless)

US_ELI_COURTLISTENER_BASE_URL

https://www.courtlistener.com/api/rest/v4 (keyless)

US_ELI_ECFR_BASE_URL

https://www.ecfr.gov/api (keyless)

The Federal Register, CourtListener and eCFR tools need no key at all.

License

Apache-2.0 (code). Congress.gov, GovInfo, Federal Register and eCFR data are US government works (public domain). CourtListener data is provided by the Free Law Project.

Install Server
A
license - permissive license
A
quality
A
maintenance

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Maintenance

–Maintainers
–Response time
4dRelease cycle
2Releases (12mo)
Commit activity

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