How do I install Us Eli?

Us Eli is a local plugin. Install it using PyPI package: us-eli-mcp and add the generated configuration snippet to your AI app's MCP config file. Then restart your AI app.

Is Us Eli safe to use?

Us Eli was flagged by MCP Marketplace's security scan, scoring 4.8/10 (high risk). It has 4 high or critical findings to review. Review the security report on this page carefully before installing it.

What credentials does Us Eli need?

Us Eli requires the following credentials or environment variables: US_ELI_API_KEY, US_ELI_GOVINFO_API_KEY, US_ELI_CACHE_DIR, US_ELI_AUDIT_DIR, US_ELI_BASE_URL, US_ELI_GOVINFO_BASE_URL, US_ELI_FR_BASE_URL, US_ELI_COURTLISTENER_BASE_URL, US_ELI_ECFR_BASE_URL. You can find setup instructions on the server detail page.

What AI apps work with Us Eli?

Us Eli uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

Back to Browse

Us Eli MCP Server

by Matematicsolutions

Developer ToolsUse Caution4.8MCP RegistryLocal

Free

Server data from the Official MCP Registry

US law MCP: bills, US Code, Federal Register, executive orders, case law (state+federal), eCFR

About

US law MCP: bills, US Code, Federal Register, executive orders, case law (state+federal), eCFR

Security Report

4.8

Use Caution4.8High Risk

This is a well-architected legal research MCP server with proper authentication for sensitive APIs, comprehensive input validation, and appropriate read-only permissions. The codebase demonstrates good security practices including error handling, audit logging, and secure credential management via environment variables. Minor code quality observations exist but do not pose security risks. Supply chain analysis found 6 known vulnerabilities in dependencies (1 critical, 3 high severity). Package verification found 1 issue.

5 files analyzed · 11 issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Required

This plugin requests these system permissions. Most are normal for its category.

HTTP Network Access

Connects to external APIs or services over the internet.

env_vars

Check that this permission is expected for this type of plugin.

File System Read

Reads files on your machine. Normal for tools that analyze or process local data.

File System Write

Writes or modifies files on your machine. Check that this is expected for the tool.

What You'll Need

Set these up before or after installing:

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

Environment variable: US_ELI_API_KEY

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

Environment variable: US_ELI_GOVINFO_API_KEY

~/.matematic/cache/us-eliOptional

Environment variable: US_ELI_CACHE_DIR

~/.matematic/auditOptional

Environment variable: US_ELI_AUDIT_DIR

https://api.congress.gov/v3Optional

Environment variable: US_ELI_BASE_URL

https://api.govinfo.govOptional

Environment variable: US_ELI_GOVINFO_BASE_URL

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

Environment variable: US_ELI_FR_BASE_URL

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

Environment variable: US_ELI_COURTLISTENER_BASE_URL

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

Environment variable: US_ELI_ECFR_BASE_URL

How to Install

Add this to your MCP configuration file:

{
  "mcpServers": {
    "io-github-matematicsolutions-us-eli-mcp": {
      "env": {
        "US_ELI_API_KEY": "your-us-eli-api-key-here",
        "US_ELI_BASE_URL": "your-us-eli-base-url-here",
        "US_ELI_AUDIT_DIR": "your-us-eli-audit-dir-here",
        "US_ELI_CACHE_DIR": "your-us-eli-cache-dir-here",
        "US_ELI_FR_BASE_URL": "your-us-eli-fr-base-url-here",
        "US_ELI_ECFR_BASE_URL": "your-us-eli-ecfr-base-url-here",
        "US_ELI_GOVINFO_API_KEY": "your-us-eli-govinfo-api-key-here",
        "US_ELI_GOVINFO_BASE_URL": "your-us-eli-govinfo-base-url-here",
        "US_ELI_COURTLISTENER_BASE_URL": "your-us-eli-courtlistener-base-url-here"
      },
      "args": [
        "us-eli-mcp"
      ],
      "command": "uvx"
    }
  }
}

Documentation

View on GitHub

From the project's GitHub README.

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.

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.

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Us Eli MCP Server

About

Security Report

Findings (11)Action required

Permissions Required

What You'll Need

How to Install

Documentation

us-eli-mcp

What this is not

Tools

Install

Configuration

License

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