eCFR
com.1102tools/ecfr-mcpElectronic Code of Federal Regulations including FAR, DFARS, and agency supplements. 13 tools.
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Tools · 13
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…
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…
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 secti…
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 u…
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_amendmen…
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…
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…
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 …
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 eCF…
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…
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, fo…
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-…
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…
How to use
Claude Desktop or claude.ai: add a custom connector (Customize → Connectors; on Team and Enterprise plans an owner adds it under Organization settings → Connectors) with this server URL: https://ecfr.1102tools.com/mcp
Cursor or Cline: add to your MCP config:
{
"mcpServers": {
"ecfr": {
"url": "https://ecfr.1102tools.com/mcp",
"transport": "streamable-http"
}
}
}
Or run it locally:
Runs locally from its PyPI package (v1.1.15). Add to your Claude Desktop / Cursor / Cline MCP config:
{
"mcpServers": {
"ecfr": {
"command": "uvx",
"args": [
"ecfr-mcp@1.1.15"
]
}
}
}
Source: github.com/1102tools-dev/federal-contracting-mcps/tree/HEAD/servers/ecfr-mcp (servers/ecfr-mcp)