US federal rules taking effect MCP Server

by joelp22-maker Your server? Claim it

answering

US federal rules taking effect is answering right now. Last checked 7 min ago. It exposes 5 tools. Last commit 21 Sep 2026.

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

Uptime history 49 days of history · worst day 93%

49 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

168 ms

Response time

average over 24h

Stars

last commit 21 Sep 2026

Nothing serious here today

Today is the operative word: we check US federal rules taking effect every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 7 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add referencesource-rules --transport http https://referencesource.org/mcp/rules

Settings → Connectors → Add custom connector, then paste this address

https://referencesource.org/mcp/rules

~/.codex/config.toml

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

.cursor/mcp.json

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

.vscode/mcp.json

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

Available tools 5

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

rules

list_rules_amending_cfr_part

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, so "40 CFR 5" never returns rules about 40 CFR 52.

list_rules_taking_effect

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 the Federal Register record. This is the compliance-calendar question — use it for "what takes effect in Q4", not for searching the Federal Register by topic.

agencies

list_agencies

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 Administration", not "FAA".

rule

get_rule

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 like "2026-13685" and appear in every other tool's results.

verify

verify_quote

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). Effective dates are exactly where a confident wrong answer costs money.

Endpoints

URL	Transport	State	Latency	Checked
https://referencesource.org/mcp/rules	streamable-http	answering	116 ms	7 min ago

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US federal rules taking effect — questions

Answers built from our own checks of this server.

What can US federal rules taking effect do?

It exposes 5 tools, read directly from the server on our last check. Among them: get_rule, list_agencies, list_rules_amending_cfr_part, list_rules_taking_effect, verify_quote. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is US federal rules taking effect working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 168 ms. The bar chart above shows every period we have measured.

How do I connect US federal rules taking effect?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does US federal rules taking effect need an API key?

No. US federal rules taking effect completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 5 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is US federal rules taking effect?

It answers our handshake in 168 ms on average, which is faster than 78% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is US federal rules taking effect open source?

The code is open source: it is published under the MIT licence, written in JavaScript and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at referencesource.org, which runs on its operator's own terms.