MCP server

US federal rules taking effect

io.github.joelp22-maker/referencesource-rules

Checked 25 Oct 2026, 20:29 UTC · Connected to it and listed its tools

Which published US federal rules take effect between two dates, and which CFR parts they amend?

Website Source

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

5

Token cost

About 1,128 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

25 Oct 2026, 20:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

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 referencesource-rules https://referencesource.org/mcp/rules

Claude Desktop

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

Codex (config.toml)

[mcp_servers.referencesource-rules]
url = "https://referencesource.org/mcp/rules"

Gemini CLI

{"mcpServers":{"referencesource-rules":{"httpUrl":"https://referencesource.org/mcp/rules"}}}

Cursor

{"mcpServers":{"referencesource-rules":{"url":"https://referencesource.org/mcp/rules"}}}

VS Code

{"servers":{"referencesource-rules":{"type":"http","url":"https://referencesource.org/mcp/rules"}}}

Antigravity

agy mcp add referencesource-rules https://referencesource.org/mcp/rules

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":"referencesource-rules","server_url":"https://referencesource.org/mcp/rules","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"referencesource-rules","server_url":"https://referencesource.org/mcp/rules"}

Tools

• get_rule ~167 tokens
  Everything this register holds for one final rule: title, agency, effective date, the rule's own DATES paragraph, the CFR parts it amends, its publication date, a link to the rule on federalregister.gov, and a verbatim quote of the Federal Register API record it was read from. Document numbers look
• list_agencies ~148 tokens
  Which agencies have rules coming? Returns each agency in this register with how many rules it has taking effect, the soonest and latest of those dates. Call it to get an agency name exactly as the Federal Register writes it before filtering with list_rules_taking_effect — "Federal Aviation Administr
• list_rules_amending_cfr_part ~242 tokens
  Is anything changing in the part of the CFR I am subject to? Give a CFR title and part — "49 CFR 192", "40 CFR 52", "21 CFR 1308" — and get the already-published final rules that amend it, soonest effective date first, with each rule's DATES paragraph and a verbatim quote. The part is matched whole,
• list_rules_taking_effect ~307 tokens
  What lands on me, and when? Lists already-published US federal final rules whose effective date falls between two dates, soonest first, optionally from one agency. Each with the rule title, the agency, the CFR parts amended, the document number, the rule's own DATES paragraph and a verbatim quote of
• verify_quote ~264 tokens
  Is this right? Check a claim about a final rule — its effective date, its agency, the CFR parts it amends — against the Federal Register record instead of trusting it. Says whether the claim matches a stored value, appears only in the verbatim quote, or differs (and then what the record says instead

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