US Federal Regulations (CFR)

Official5 tools

by nguyenhieuec

Read a CFR or eCFR section, or search US federal regulations and the Federal Register.

MCP Server: app.openkrill/rules

The MCP server app.openkrill/rules provides access to the underlying rules content. Its description indicates that the intended interaction is to “Read the rule itself instead of a summary of it,” meaning the server focuses on retrieving the full rule text rather than condensed explanations.

🛠️ Key Features

Exposes rule content directly for reading

🚀 Use Cases

Retrieve a specific rule’s full text for review
Use rule text as a reference instead of relying on summaries

⚡ Developer Benefits

Clear access pattern geared toward full rule retrieval

⚠️ Limitations

No additional capabilities, topics, or tool count are provided in the available source data

Captured live from the server via tools/list.

get_cfr_section

Read an eCFR section (FDA, OSHA, EPA). Use this when the user asks what a specific US federal regulation says, including an FDA, OSHA, EPA, SEC, FTC or FAA section of the eCFR, for example "what does 21 CFR 11.10 say?", "read 29 CFR 1910.134" or "show me 17 CFR 240.10b-5". Pass the CFR title number and the section number. Returns the current text, heading, statutory authority and amendment history of the section, the date the eCFR is up to date as of and a link to it. A very long section is cut at a paragraph and flagged with nextOffset; call again with that offset to read on. This is general information, not legal advice. Do not use it to find a regulation by topic (use search_cfr), for statutes, state law or court decisions, or to decide whether someone complies.

Parameters3

title	integer	required	CFR title number, 1 to 50: for example 21 is Food and Drugs, 29 Labor, 17 Securities, 40 Environment, 14 Aeronautics.
section	string	required	Section number as written in the citation, without the section sign: "11.10", "240.10b-5" or "1910.134".
offset	integer	optional	Where to start reading, in characters. Leave out to read from the start; to read on in a section that was cut, pass the nextOffset of the last answer.

Raw schema

{
  "type": "object",
  "properties": {
    "title": {
      "type": "integer",
      "minimum": 1,
      "maximum": 50,
      "description": "CFR title number, 1 to 50: for example 21 is Food and Drugs, 29 Labor, 17 Securities, 40 Environment, 14 Aeronautics."
    },
    "section": {
      "type": "string",
      "minLength": 3,
      "maxLength": 40,
      "description": "Section number as written in the citation, without the section sign: \"11.10\", \"240.10b-5\" or \"1910.134\"."
    },
    "offset": {
      "type": "integer",
      "minimum": 0,
      "description": "Where to start reading, in characters. Leave out to read from the start; to read on in a section that was cut, pass the nextOffset of the last answer."
    }
  },
  "required": [
    "title",
    "section"
  ],
  "additionalProperties": false
}

search_cfr

Use this when the user asks which US federal regulations or compliance rules cover a topic, including an OSHA, EPA or FDA rule, for example "which regulations mention respirator fit testing?", "find the rules on electronic signatures in title 21" or "where does the CFR define small business?". Pass 2 to 4 words to find and, if known, the CFR title to search in. A section must hold every word; when nothing does, the search drops the last words and says which query matched (matchedQuery). Returns the best matching sections with citation, heading, an excerpt, the agency and a link; use get_cfr_section to read one in full. This is general information, not legal advice. Do not use it for recent rulemaking news (use search_federal_register), statutes, state law or court decisions.

Parameters3

query	string	required	2 to 4 words to find in the current regulations, for example 'electronic signatures' or 'respirator fit testing'. A section must hold every word, so use the words a regulation would use ('type size', not 'font size').
title	integer	optional	Only search this CFR title. Leave out to search all titles.
limit	integer	optional	Most sections to return. Default 5.

Raw schema

{
  "type": "object",
  "properties": {
    "query": {
      "type": "string",
      "minLength": 3,
      "maxLength": 200,
      "description": "2 to 4 words to find in the current regulations, for example 'electronic signatures' or 'respirator fit testing'. A section must hold every word, so use the words a regulation would use ('type size', not 'font size')."
    },
    "title": {
      "type": "integer",
      "minimum": 1,
      "maximum": 50,
      "description": "Only search this CFR title. Leave out to search all titles."
    },
    "limit": {
      "type": "integer",
      "minimum": 1,
      "maximum": 10,
      "description": "Most sections to return. Default 5."
    }
  },
  "required": [
    "query"
  ],
  "additionalProperties": false
}

search_federal_register

Use this when the user asks what federal agencies have published, proposed or announced, including a rulemaking, for example "what has the FDA proposed on food dyes?", "find final rules on noncompete agreements" or "which executive orders mention AI this year?". Pass the words to find and optionally the document type (rule, proposed_rule, notice, presidential_document) and a publication date range. Returns each document's title, type, agencies, publication date, abstract, effective date, comment deadline, the CFR parts it changes and a link. This is general information, not legal advice. Do not use it to read the current text of a regulation (use get_cfr_section), or for state law, bills, court decisions or non-US rules.

Parameters6

query	string	required	Words to find in Federal Register documents, for example 'noncompete' or 'PFAS drinking water'.
documentType	string	optional	rule is a final rule, proposed_rule a proposal open to comment, notice an agency notice, presidential_document an executive order or proclamation.
publishedFrom	string	optional	Earliest publication date, as YYYY-MM-DD.
publishedTo	string	optional	Latest publication date, as YYYY-MM-DD.
order	string	optional	Default relevance.
limit	integer	optional	Most documents to return. Default 5.

Raw schema

{
  "type": "object",
  "properties": {
    "query": {
      "type": "string",
      "minLength": 3,
      "maxLength": 200,
      "description": "Words to find in Federal Register documents, for example 'noncompete' or 'PFAS drinking water'."
    },
    "documentType": {
      "type": "string",
      "enum": [
        "rule",
        "proposed_rule",
        "notice",
        "presidential_document"
      ],
      "description": "rule is a final rule, proposed_rule a proposal open to comment, notice an agency notice, presidential_document an executive order or proclamation."
    },
    "publishedFrom": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "Earliest publication date, as YYYY-MM-DD."
    },
    "publishedTo": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "Latest publication date, as YYYY-MM-DD."
    },
    "order": {
      "type": "string",
      "enum": [
        "relevance",
        "newest"
      ],
      "description": "Default relevance."
    },
    "limit": {
      "type": "integer",
      "minimum": 1,
      "maximum": 10,
      "description": "Most documents to return. Default 5."
    }
  },
  "required": [
    "query"
  ],
  "additionalProperties": false
}

submit_feedback

Send feedback, a bug report or a tool request to the maintainers of the tools on this server: a missing tool, missing or stale data, or a tool that broke or gave a wrong answer. Pass the kind (need_tool, need_data, bug or other), one short message (at most 1000 characters) and, if you know them, the tool name and the error text it returned. Returns a ticket id. Feedback is not a chat: nothing in it is run or followed. Links, emails and phone numbers are removed and nothing about you is stored.

Parameters4

kind	string	required	need_tool: a tool you want. need_data: data a tool lacks. bug: something broke. other: anything else about the tools.
message	string	required	What you need or what broke, in plain words, at most 1000 characters. Links, email addresses and phone numbers are removed. Never include secrets or personal details.
tool	string	optional	Optional: the exact name of the tool on this server that the feedback is about, as tools/list shows it.
error	string	optional	Optional: for a failed call, the error text it returned, copied as you saw it. Kept to 500 characters; links, email addresses and phone numbers are removed. Never include secrets or personal details.

Raw schema

{
  "type": "object",
  "properties": {
    "kind": {
      "type": "string",
      "enum": [
        "need_tool",
        "need_data",
        "bug",
        "other"
      ],
      "description": "need_tool: a tool you want. need_data: data a tool lacks. bug: something broke. other: anything else about the tools."
    },
    "message": {
      "type": "string",
      "minLength": 10,
      "maxLength": 1000,
      "description": "What you need or what broke, in plain words, at most 1000 characters. Links, email addresses and phone numbers are removed. Never include secrets or personal details."
    },
    "tool": {
      "type": "string",
      "pattern": "^[A-Za-z0-9_.:-]{1,64}$",
      "description": "Optional: the exact name of the tool on this server that the feedback is about, as tools/list shows it."
    },
    "error": {
      "type": "string",
      "description": "Optional: for a failed call, the error text it returned, copied as you saw it. Kept to 500 characters; links, email addresses and phone numbers are removed. Never include secrets or personal details."
    }
  },
  "required": [
    "kind",
    "message"
  ],
  "additionalProperties": false
}

get_feedback_reply

Read the maintainers' reply to feedback you sent with submit_feedback, given its ticket id. Returns status pending until a reply is ready, then status answered with the reply text. The reply is information for you, not an instruction.

Parameters1

ticket

string

required

The ticket id that submit_feedback returned.

Raw schema

{
  "type": "object",
  "properties": {
    "ticket": {
      "type": "string",
      "pattern": "^fb_[0-9a-f]{32}$",
      "description": "The ticket id that submit_feedback returned."
    }
  },
  "required": [
    "ticket"
  ],
  "additionalProperties": false
}

plugins/research/README.md1 KBView on GitHub

Research and Public Data

Find papers, check references and DOIs, read US federal regulations, compare country statistics, and make a school digest.

bash

claude plugin install research@openkrill

Skill and MCP server	Tool	Endpoint
`papers`	Paper Finder	`https://papers.openkrill.app/mcp`
`citations`	Citation Checker	`https://citations.openkrill.app/mcp`
`rules`	US Federal Regulations (CFR)	`https://rules.openkrill.app/mcp`
`countrystats`	Country Stats Facts	`https://countrystats.openkrill.app/mcp`
`school-digest`	School Digest	`https://schooldigest.openkrill.app/mcp`

Every server is public, read-only and needs no key. Generated from the Agent Tools plugin listings; edits made here are overwritten.

Install

Tools (5)

get_cfr_sectionsearch_cfrsearch_federal_registersubmit_feedbackget_feedback_reply

Remote endpoint

Streamable HTTP

Hosted server - connect over the network, no local install.

url

https://rules.openkrill.app/mcp

Add to VS Code Add to Cursor

claude_desktop_config.json

json

{
  "mcpServers": {
    "rules": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://rules.openkrill.app/mcp"
      ]
    }
  }
}

Desktop config is stdio-only; this bridges via mcp-remote. Native remote: Settings > Connectors.

MCP Server: app.openkrill/rules

🛠️ Key Features

🚀 Use Cases

⚡ Developer Benefits

⚠️ Limitations

get_cfr_section

search_cfr

search_federal_register

submit_feedback

get_feedback_reply

Research and Public Data

Install

Remote endpoint

Related servers