US Codex
Federal law: US Code, CFR, public laws, bills and executive orders, cross-linked and versioned.
Should I use this
Quality & Safety
Findings (1)
- LOWTool 'history' description lacks action verbin history
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"uscodex": {
"url": "https://uscodex.org/mcp"
}
}
}Remote endpoints
https://uscodex.org/mcpstreamable-httphttps://uscodex.org/mcp/ssesseWhat it can do
Tool inventory
Tools (5)
🟢search(corpus, date, page, query, title)
Search the full text of federal law: United States Code, Code of Federal Regulations, Public Laws, Congressional Bills, Executive Orders. Results are ranked across every corpus unless `corpus` narrows them, each with its citation, a link and the matching words. A query that is only a citation returns that document instead.
Input Schema
{
"type": "object",
"properties": {
"corpus": {
"description": "Search one corpus only.",
"enum": [
"usc",
"cfr",
"pl",
"bills",
"eo"
],
"type": "string"
},
"date": {
"description": "For a code, search it as it stood on this date (YYYY-MM-DD).",
"type": "string"
},
"page": {
"default": 1,
"description": "Page of results, 20 to a page.",
"type": "integer"
},
"query": {
"description": "Words, a \"quoted phrase\", NOT before a word to exclude it, or a citation.",
"type": "string"
},
"title": {
"description": "For a code, search one title (\"11\", \"40\").",
"type": "string"
}
},
"required": [
"query"
]
}🟢fetch(citation, notes, path, provision, release)
Read a document or page of the site as markdown: a code section with its notes, a title's or unit's contents, a public law, a bill (at any version), an executive order. Paths also reach the corpus indexes ("/usc", "/pl?congress=118", "/bills?congress=119", "/eo") and each code's releases ("/usc/releases"). Links in the markdown are paths this tool accepts.
Input Schema
{
"type": "object",
"properties": {
"citation": {
"description": "A citation (\"26 U.S.C. 61(a)\", \"40 CFR 60.1\", \"Pub. L. 119-21\", \"H.R. 1\", \"E.O. 14000\"). Give this or `path`.",
"type": "string"
},
"notes": {
"default": true,
"description": "Include a section's source credit, notes and footnotes.",
"type": "boolean"
},
"path": {
"description": "A page of the site, as its path or full URL (\"/usc/26/61\", \"/pl/119/21\"). Give this or `citation`.",
"type": "string"
},
"provision": {
"description": "Part of the document: in a code section, a provision and everything under it (\"a-1\" for (a)(1)) or a run of them (\"a..c\"); in a law, bill or order, a heading's {#anchor} (\"tI-stA-s10101\") or a provision under it (\"tI-stA-s10101-a\").",
"type": "string"
},
"release": {
"description": "For a code, the release to read it at: a release point (\"119-21\") or a date (YYYY-MM-DD) for the release in force then. Defaults to the latest.",
"type": "string"
}
}
}⚪citations(citation, list, offset, path)
What cites a document: each corpus's citations of a code section, law, bill or order, with the words that cite it, and for a statute the regulations issued under it. Lists come 50 at a time; `list` and `offset` page through one.
Input Schema
{
"type": "object",
"properties": {
"citation": {
"description": "A citation (\"26 U.S.C. 61(a)\", \"40 CFR 60.1\", \"Pub. L. 119-21\", \"H.R. 1\", \"E.O. 14000\"). Give this or `path`.",
"type": "string"
},
"list": {
"description": "One list only, by the corpus that cites.",
"enum": [
"code",
"cfr-citations",
"laws",
"bills",
"orders"
],
"type": "string"
},
"offset": {
"default": 0,
"description": "With `list`, where in it to start.",
"type": "integer"
},
"path": {
"description": "A page of the site, as its path or full URL (\"/usc/26/61\", \"/pl/119/21\"). Give this or `citation`.",
"type": "string"
}
}
}⚪history(citation, path)
How a document came to be: for a code section, the laws that enacted and amended it and every release that changed its text; for a law or bill, its legislative history, each version linked to its text and to what changed from the one before.
Input Schema
{
"type": "object",
"properties": {
"citation": {
"description": "A citation (\"26 U.S.C. 61(a)\", \"40 CFR 60.1\", \"Pub. L. 119-21\", \"H.R. 1\", \"E.O. 14000\"). Give this or `path`.",
"type": "string"
},
"path": {
"description": "A page of the site, as its path or full URL (\"/usc/26/61\", \"/pl/119/21\"). Give this or `citation`.",
"type": "string"
}
}
}⚪compare(citation, from, only_edits, path, to)
What changed in a code section between two releases: each provision added, removed, changed or renumbered, the edits marked <del> and <ins>. To compare versions of a bill, take the 'what changed' link from its history.
Input Schema
{
"type": "object",
"properties": {
"citation": {
"description": "A citation (\"26 U.S.C. 61(a)\", \"40 CFR 60.1\", \"Pub. L. 119-21\", \"H.R. 1\", \"E.O. 14000\"). Give this or `path`.",
"type": "string"
},
"from": {
"description": "Release point or date to compare from. Defaults to the release before `to`.",
"type": "string"
},
"only_edits": {
"default": true,
"description": "Only the provisions that changed, not the whole text.",
"type": "boolean"
},
"path": {
"description": "A page of the site, as its path or full URL (\"/usc/26/61\", \"/pl/119/21\"). Give this or `citation`.",
"type": "string"
},
"to": {
"description": "Release point or date to compare to. Defaults to the latest.",
"type": "string"
}
}
}Community
Evidence