US federal rules taking effect
Which published US federal rules take effect between two dates, and which CFR parts they amend?
| Endpoint | https://referencesource.org/mcp/rules (streamable-http) |
|---|---|
| Registry version | 1.0.0 |
| Now | 5 tools · grade A (98) · pin ts_a996672d27a83b99382c0b01760c1971 · protocol 2025-06-18 |
| First / last listed | 2026-11-15 00:09 UTC / 2026-11-15 00:09 UTC |
| Grade over time | 2026-11-15: A (98), 5 tools |
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Tools: list_rules_taking_effect get_rule list_agencies list_rules_amending_cfr_part verify_quote
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 effe params: from*, to*, agency, limit |
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. params: document_number* |
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". params: query |
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. params: cfr_part*, from, limit |
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. params: claimed_value*, field, document_number* |
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