MCP server

US Federal Regulations (CFR)

app.openkrill/rules

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

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

Working at last checkVerified publisher: openkrill.appAbout 1,926 tokens per request once connected5 tools

https://rules.openkrill.app/mcp

At a glance

Type: MCP server
Publisher: openkrill.app (verified by the MCP Registry)
Status: Working at last check
Tools: 5
Token cost: About 1,926 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

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 rules https://rules.openkrill.app/mcp

Claude Desktop

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

Codex (config.toml)

[mcp_servers.rules]
url = "https://rules.openkrill.app/mcp"

Gemini CLI

{"mcpServers":{"rules":{"httpUrl":"https://rules.openkrill.app/mcp"}}}

Cursor

{"mcpServers":{"rules":{"url":"https://rules.openkrill.app/mcp"}}}

VS Code

{"servers":{"rules":{"type":"http","url":"https://rules.openkrill.app/mcp"}}}

Antigravity

agy mcp add rules https://rules.openkrill.app/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":"rules","server_url":"https://rules.openkrill.app/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"rules","server_url":"https://rules.openkrill.app/mcp"}

get_cfr_section ~432 tokens
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
search_cfr ~414 tokens
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
search_federal_register ~503 tokens
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

Federal Regulations
Search and trace US federal rules across the Federal Register, eCFR, and Regulations.gov.
Ecfr
eCFR (Electronic Code of Federal Regulations) MCP.
eCFR.io Federal Regulations
Search and read US federal regulations with legal and inline citations linking to ecfr.io.
FedReg Tracker
Federal regulatory intelligence from the Federal Register: search rules and notices, track deadlines
LiveDataLink
294 public-data tools across 60 domains; source freshness varies. Free tier.
eCFR
Electronic Code of Federal Regulations including FAR, DFARS, and agency supplements. 13 tools.
GovInbox
Federal contract opportunities for government contractors. Set-aside coverage is the deepest part.
HenryKnows
F-1 and J-1 student immigration answers with citations to regulations and agency guidance.

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