eCFR

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What this server can do and what it asks for, from its tool list, install config and code. Checked Oct 25, 2026.

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Tools (13)

Read from the source code; the running server may differ. Descriptions are the server’s own words; hidden characters are shown as [U+…].

• compare_versionsCompare Versionsread-only

  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), 'identical' when nothing differs, and the parsed text at both dates side by side. When both texts together are too long to send, the full texts are left out (texts_omitted) and 'changes' is kept. changes_only=True leaves the full texts out every time: the short answer to "what changed". Dates must be in YYYY-MM-DD …

• find_far_definitionFind FAR Definitionread-only

  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 acronym 2.101 puts in a name, so 'service-disabled veteran-owned small business concern', 'SDVOSB concern', 'COTS', 'commercial services' and 'contract means' all find their definitions. Other 2.101 paragraphs that use the term (whole words only) follow as kind='mention', each naming the definition it sits in. Wh…

• find_recent_changesFind Recent Changesread-only

  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=false). 'summary' counts each kind. A section changed twice appears twice. since_date must be in YYYY-MM-DD format. Filter with title (default 48), chapter (Title 48: 1 = FAR, 2 = DFARS, 99 = CAS) or part. per_page (default 100, max 5000) and page step through long lists; total_pages says how many pages there are. …

• get_ancestryGet Ancestryread-only

  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. part/subpart/section/appendix accept int or string. The answer says which date it describes.

• get_cfr_contentGet CFR Contentread-only

  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 "[See table 1: ...]" sits in the paragraphs where each appears. [fn N] marks a footnote reference. pending_amendments means eCFR links a published amendment that may not be in effect yet. A subpart, part or appendix request returns one object per section under 'sections', each with its own section number and he…

• get_cfr_structureGet CFR Structureread-only

  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). Use part or subpart, then walk the children to find sections. Common patterns: - part='15' for FAR Part 15 structure - subpart='15.3' for just that subpart's sections - chapter='1', depth=2 for the FAR's subchapters and parts only - appendix='Appendix A to Part 200' with part='200' (title 2) for one appendix dept…

• get_correctionsGet Correctionsread-only

  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 since its last amendment. section (e.g. '52.204-21'), part (e.g. '52') or chapter (e.g. '2' for the DFARS) keeps only corrections that touch it. since_year keeps corrections with year >= since_year. limit caps how many are returned (default 50, max 1000); truncated says whether older ones were left out. Title 48 has ~…

• get_latest_dateGet Latest Dateread-only

  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 Acquisition Regulations System (FAR, DFARS, and all agency supplements). Other common titles: 2 (Grants/Agreements), 5 (Administrative Personnel), 29 (Labor), 41 (Public Contracts). Raises ValueError for titles 1-50 that are reserved (no content).

• get_version_historyGet Version Historyread-only

  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 are grouped by section, oldest first. since_date/until_date (YYYY-MM-DD) keep versions dated in that range. per_page (default 200, max 1000) and page step through long histories; total_count and total_pages say how many there are. 'substantive' is eCFR's flag: true when the version's text differs from the one befo…

• list_agenciesList Agenciesread-only

  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_references` to keep the response compact (~20 KB vs ~100 KB). References owned by child agencies are merged into the parent row, so chapter lookups like DFARS (chapter 2, on a DoD child agency) still work in summary mode. Set False for the full raw payload including children.

• list_sections_in_partList Sections in Partread-only

  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, section_count and first and last section). Useful for seeing the scope of a part before reading specific sections. The part number alone is enough: chapter is optional (Title 48 parts are unique: 52 = FAR, 252 = DFARS, 552 = GSAR) and the answer reports the chapter the part is in. subpart (e.g. '52.2') lists one su…

• lookup_far_clauseLookup FAR Clauseread-only

  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, 1852.x = NFS, 3052.x = HSAR), so chapter is optional. Prefixes like 'FAR', 'DFARS', '§' and '48 CFR', en dashes, and trailing paragraph cites such as '(d)(11)(xviii)' are handled. Auto-resolves the latest available date. Returns parsed clean text with heading, paragraphs and citations, plus tables, notes (such …

• search_cfrSearch CFRread-only

  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 is checked against the section's version history: older copies of a section are dropped, and hits whose text has since been replaced or removed are dropped and listed under current_check ('superseded' with the current version's date, 'removed' with the removal date). Up to 10 parts per page are checked; any hit not …

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Last commit (this folder)

Oct 23, 2026 (5 days ago)

Last release

Oct 21, 2026 (7 days ago)

Last package publish

Oct 23, 2026 (5 days ago)

From GitHub (fetched Oct 24, 2026) and the package registry.

Details

Registry name

io.github.1102tools/ecfr-mcp

Version

0.2.6

Auth

No auth

Packages

pypi ecfr-mcp

License

MIT

Repository

github.com/1102tools/federal-contracting-mcps

Website

1102tools.com

First seen

Oct 24, 2026

Last checked

Oct 25, 2026

Source

Official MCP Registrygithub-graphql