MCP server

eCFR

com.1102tools/ecfr-mcp

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Electronic Code of Federal Regulations including FAR, DFARS, and agency supplements. 13 tools.

Website Source

At a glance

Type

MCP server

Publisher

1102tools.com (verified by the MCP Registry)

Status

Working at last check

Tools

13

Token cost

About 6,342 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http ecfr-mcp https://ecfr.1102tools.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.ecfr-mcp]
url = "https://ecfr.1102tools.com/mcp"

Gemini CLI

{"mcpServers":{"ecfr-mcp":{"httpUrl":"https://ecfr.1102tools.com/mcp"}}}

Cursor

{"mcpServers":{"ecfr-mcp":{"url":"https://ecfr.1102tools.com/mcp"}}}

VS Code

{"servers":{"ecfr-mcp":{"type":"http","url":"https://ecfr.1102tools.com/mcp"}}}

Antigravity

agy mcp add ecfr-mcp https://ecfr.1102tools.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"ecfr-mcp","server_url":"https://ecfr.1102tools.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"ecfr-mcp","server_url":"https://ecfr.1102tools.com/mcp"}

Tools

• compare_versions ~481 tokens
  Compare the text of a CFR section at two different dates. Useful for understanding what changed in a regulatory amendment. Returns 'changes' (each paragraph that was added, removed or changed, with its before and after text; also heading, table and pending-amendment-link changes), '
• find_far_definition ~457 tokens
  Find a term's definition in FAR 2.101, the FAR's main definitions section. Returns each matching definition whole (the defining paragraph and every sub-paragraph under it), first, marked kind='definition'. Matching ignores case, hyphens, spacing, plurals, a trailing "means", and the
• find_recent_changes ~396 tokens
  Find CFR sections changed since a given date, removals included. Built on eCFR's version history: every version issued on or after since_date, newest first. Each change says whether the section was amended, removed (change='removed'), or re-issued with no text change (substantive=fa
• get_ancestry ~317 tokens
  Get the breadcrumb hierarchy path for a section, part, or appendix. Returns ancestors from title down to the target node: title > chapter > subchapter > part > subpart > section. Useful for understanding where a section sits in the CFR hierarchy and what regulation it belongs to. p
• get_cfr_content ~801 tokens
  Get the full text of a CFR section, subpart, part, or appendix. Returns parsed clean text by default: heading, paragraphs and citations, plus tables, notes, examples, images, pending_amendments and editorial_notes when present. Tables, notes and examples are numbered, and a marker like
• get_cfr_structure ~602 tokens
  Get the hierarchical table of contents for a CFR title or subset. Returns a nested tree of titles, chapters, parts, subparts, and sections with identifiers, descriptions, and byte sizes, plus the date it describes. IMPORTANT: Does NOT support section-level filtering (returns 400).
• get_corrections ~385 tokens
  Get editorial corrections for a CFR title, newest first. Returns corrections with CFR references, corrective actions, error dates, and FR citations, sorted by the date the error was corrected, newest first. Useful for checking whether a section's current text has been corrected sinc
• get_latest_date ~219 tokens
  Get the most recent available date for a CFR title. CRITICAL: eCFR lags 1-2 business days behind the Federal Register. Using today's date on versioner endpoints causes 404 errors. Call this first to get the safe date, then pass it to other tools. Default title 48 = Federal Acquisit
• get_version_history ~622 tokens
  Get the version history of a CFR section, subpart, or part. Returns content_versions (each with date, amendment_date, issue_date, identifier, name, substantive and removed), every version eCFR lists: all of eCFR's pages are read, so Part 52's 2,264 versions are all there. Versions a
• list_agencies ~226 tokens
  List all agencies with their CFR title and chapter references. Returns agency names, slugs, and which CFR titles/chapters they own. Useful for finding which chapter corresponds to an agency's FAR supplement. summary_only (default True) strips the `children` and most of `cfr_referen
• list_sections_in_part ~507 tokens
  List all sections and appendices in a CFR part with their headings. Returns 'sections' in order, each {identifier, heading}, with type='appendix' on appendices (2 CFR 200's Appendix I-XII, for example) and reserved=true on reserved sections, plus 'subparts' (each with its heading, s
• lookup_far_clause ~449 tokens
  Convenience tool: look up the current text of a FAR, DFARS or FAR supplement section or clause. Pass a section identifier like '15.305', '52.212-4', '2.101', 'DFARS 252.204-7012' or '552.238-81'. The chapter comes from the number (52.x = FAR, 252.x = DFARS, 552.x = GSAR, 852.x = VAAR, 1
• search_cfr ~880 tokens
  Full-text search across the Code of Federal Regulations. Returns matching sections with excerpts, headings, scores, and hierarchy. current_only=True (default) returns only text in effect now. eCFR's own "current" index still lists some superseded and removed versions, so each hit i

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