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\n

@cyanheads/federal-regulations-mcp-server

\n

Search and trace US federal rules across the Federal Register (proposed/final rules and notices), the eCFR (codified, point-in-time CFR full text, locally mirrored), and Regulations.gov (rulemaking dockets and public comments) via MCP. STDIO or Streamable HTTP.\n

7 Tools • 2 Resources
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\n\n**Public Hosted Server:** [https://federal-regulations.caseyjhand.com/mcp](https://federal-regulations.caseyjhand.com/mcp)\n\n
\n\n---\n\n## Overview\n\nUS federal regulatory law from three official sources: the Federal Register (proposed rules, final rules, and notices), the eCFR (codified CFR text, current or as of a past date), and Regulations.gov (rulemaking dockets and public comments). Search rules, trace a document from proposal through its comments to the codified text, and read CFR sections. Runs as a stdio process, a local Streamable HTTP server, or the public hosted endpoint above.\n\n### Tools\n\n| Tool | Description |\n|:---|:---|\n| `regulations_search_rules` | Search Federal Register proposed rules, final rules, notices, and presidential documents by query, type, agency, date range, CFR part, docket number, and RIN, or resolve a page cite to its document |\n| `regulations_get_document` | Fetch one Federal Register document by number, with the docket IDs, CFR parts, citation, comment count, and comment URL that chain into other tools |\n| `regulations_browse_cfr` | List CFR titles, a title's chapters, or every section and appendix in a part, or full-text-search the codified CFR |\n| `regulations_get_cfr_section` | Read codified CFR text for a section, whole part, or appendix, current or as of a past date |\n| `regulations_get_docket` | Pull a rulemaking docket and its filed documents from Regulations.gov (key required) |\n| `regulations_find_comments` | Fetch public comments on a document or docket, or one comment's full body and attachments (key required) |\n| `regulations_list_open_comments` | List documents currently open for public comment, soonest closing first |\n\n### Resources\n\n| Resource | Description |\n|:---|:---|\n| `regulations://document/{documentNumber}` | One Federal Register document's metadata and cross-source handles |\n| `regulations://cfr/{title}/{part}/{section}` | Codified text of a current CFR section |\n\nBoth resources mirror a tool (`regulations_get_document`, `regulations_get_cfr_section`), so tool-only clients lose nothing.\n\n## Capability reference\n\n### `regulations_search_rules` tool\n\n- Optional full-text `query`, filtered by `type` (`PRORULE` / `RULE` / `NOTICE` / `PRESDOCU`), `agencies` (Federal Register slugs such as `environmental-protection-agency`, not names or acronyms), `published_after` / `published_before`, `cfr_title` + `cfr_part` (a part number or range such as `140-143`; `cfr_part` needs `cfr_title`, else `title_required_for_part`), `docket_id` (a docket number as the Federal Register prints it), and `rin`, all combined; `per_page` 2–100 (default 20), `page` 1–50\n- `citation` (`\"89 FR 49102\"`) with `citation_date` (the date its source note prints beside it) returns the documents printed on that page, in page order, volume 59 (1994) onward. A cite missing its date, or combined with the date window, fails with `citation_incomplete`; a volume before 59 or a date from another year fails with `citation_out_of_range`. When no document spans the page, the notice gives that day's page range\n- Each result carries `documentNumber`, `citation` / `startPage` / `endPage`, `agencies[].slug`, the printed `docketIds`, `regulationsGovDocketId` and `regulationsGovDocumentId`, `commentCount`, `commentUrl`, `commentsCloseOn` with `commentPeriodOpen` (open through 11:59 PM Eastern on the close date), `regulationIdNumbers`, and `cfrReferences` for the follow-up tools. `totalPages` and `nextPage` page the results. The Federal Register serves 50 pages, so `truncated` marks a set larger than 50 × `per_page` (1,000 at the default, 5,000 at 100); narrow the date window rather than paging deeper. `totalCount` stops at 10,000, which means at least that many. A window whose start falls after its end fails with `date_range_inverted`, and `invalid_filter` names a rejected parameter\n\n---\n\n### `regulations_get_document` tool\n\n- `document_number` in any form the Federal Register issues: `2024-07773` from 2010 on, and older and correction numbers such as `98-1572`, `E9-25990`, or `C1-2009-30484`; `include_full_text` adds the plain-text body as one window of `max_chars` (default 64,000, max 200,000) starting at `offset`, and passing either of those implies it\n- Returns metadata plus the handles other tools take: the Regulations.gov `docketId` and `regulationsGovDocumentId`, the printed `docketIds`, `citation` / `startPage` / `endPage`, `commentCount`, `commentUrl`, `commentPeriodOpen`, and `cfrReferences`. With text, `fullTextLength` and `fullTextNextOffset` (present while text remains) page the body; a major final rule runs past a million characters\n\n---\n\n### `regulations_browse_cfr` tool\n\n- `mode: \"structure\"` lists the 50 titles, a title's top-level divisions, or, with `title` + `part`, every section and appendix in the part with its `subpart` and `subjectGroup`; `mode: \"search\"` full-text-searches the codified CFR and requires `query`. `title`, `part` (needs `title`), and a point-in-time `date` scope both modes, and `per_page` 1–50 (default 20) pages search results and part listings\n- Search rows carry `cfrCite`, `heading`, `hierarchyPath`, and `excerpt`, one per section. `source` (`mirror` / `live`) and `sourceScope` name the corpus that answered and what it covers, and `countBasis` says whether `totalCount` counts `sections` or `section_versions`; live search reaches eCFR's first 10,000 hits only (`page_out_of_window` past them)\n\n---\n\n### `regulations_get_cfr_section` tool\n\n- One section (`title` + `part` + `section`), a whole part (`section` omitted), or one appendix (`appendix`, verbatim as `regulations_browse_cfr` emits it, e.g. `Appendix A-1 to Part 50`). `section` also takes cites as people write them (`\"61\"`, `\"§ 141.61\"`, `\"141.61(c)\"`) and the `cfrCite` the server returns (`\"40 CFR 141.61\"`, `\"14 CFR 241 § 25\"`; a cite naming another title fails with `conflicting_title`), `part` takes `\"Part 141\"`, and `date` reads text from 2017-01-01 through the title's up-to-date date\n- Text comes back as one `bodyText` window (`max_chars` default 64,000, max 200,000, from `offset`), paged by `bodyTextLength` and `bodyTextNextOffset`. A whole-part read adds a `sections[]` index with each section's `offset` and names its `appendices` without their text; `source` (`mirror` / `live`) reports provenance\n- A whole-part read also returns the part's `heading`, `authority`, `sourceNote`, and `notes`, and each `sections[]` entry carries the Authority or Source its subpart or subject group states for it\n- Superscripts read `^x` and subscripts `_x` (`3 × 10^−8`, `CO_{2}e`), footnote markers `[n]`, and diacritics and overlines are combining marks (`x̄`)\n\n---\n\n### `regulations_get_docket` tool · key required\n\n- `docket_id`, the Regulations.gov docket ID (e.g. `EPA-HQ-OAR-2025-0194`) — `regulationsGovDocketId` on a search or open-comments row, `docketId` from `regulations_get_document`, not a printed `docketIds` entry; `document_types` filters to `Proposed Rule`, `Rule`, `Notice`, `Supporting & Related Material`, or `Other`; `per_page` 5–250 (default 25), `page` 1–40\n- Returns the docket's metadata, `documentCount`, and `documents[]`, each with an `objectId` for `regulations_find_comments`, a `frDocNum` back to `regulations_get_document`, and `commentPeriodOpen` as Regulations.gov reports it. `totalPages` and `nextPage` page the documents; Regulations.gov serves 40 pages, so `truncated` marks a docket larger than 40 × `per_page` (10,000 at 250)\n\n---\n\n### `regulations_find_comments` tool · key required\n\n- Exactly one of `docket_id`, `document_object_id`, `fr_document_number`, or `comment_id`; list scopes take `per_page` 5–250 (default 25) and `page` 1–40\n- `document_object_id` takes an object ID (`0900006485883ec6`) or a document ID (`EPA-HQ-OW-2022-0114-0027`). `fr_document_number` resolves to the Regulations.gov document carrying that exact number and answers `not_found` when none does\n- Lists narrow by comment text with `search_term`, and each hit then carries `highlightedContent`, the matched passages. `posted_after` / `posted_before` set an inclusive posted-date window. A backwards window fails with `date_range_inverted`, and filters passed with `comment_id` fail with `filter_requires_list_mode`\n- `mode` is `list` or `detail`. Lists return comment summaries without body text. `comment_id` returns the body, submitter, `receivedDate`, `postmarkDate`, `duplicateComments` (above 1 marks a mass-mail campaign record), and `attachments`, with `attachmentOnly: true` when the substance is in a PDF/DOCX file. Lists carry `totalPages` and `nextPage`; `truncated` marks a set larger than the 40 pages Regulations.gov serves reach (40 × `per_page`, 10,000 at 250), and posted-date windows take it one slice at a time\n\n---\n\n### `regulations_list_open_comments` tool\n\n- Optional `query`, `type` (`PRORULE`, `RULE`, `NOTICE`; default `[\"PRORULE\", \"RULE\"]`), `agencies` (Federal Register slugs), and `closing_before`; `per_page` 1–100 (default 20)\n- Rows sort by closing date, soonest first, and carry `commentsCloseOn`, `daysRemaining`, `documentNumber`, the printed `docketIds`, `regulationsGovDocketId` and `regulationsGovDocumentId`, `commentCount`, and `commentUrl`. `asOf` is today's date in Eastern time, so a document stays listed through its close day. `totalPages` and `nextPage` page the window; `truncated` means the Federal Register's 10,000-document limit was reached\n- Keyless. `keyed` reports whether `REGULATIONS_GOV_API_KEY` is set, which `regulations_get_docket` and `regulations_find_comments` need to follow up on a row\n\n---\n\n### `regulations://document/{documentNumber}` resource\n\n- `documentNumber` in any Federal Register form (`2024-07773`, `98-1572`, `E9-25990`); the payload is `regulations_get_document`'s without the body text\n- `docketId`, `regulationsGovDocumentId`, the printed `docketIds`, `cfrReferences`, `citation`, `commentCount`, and `commentUrl` chain into the search, comment, and CFR tools\n\n---\n\n### `regulations://cfr/{title}/{part}/{section}` resource\n\n- Sections only, at the current date and the tool's default 64,000-character window; the `part` and `section` segments resolve the way the tool resolves them (`\"Part 141\"`; `\"61\"`, `\"§ 141.61\"`, `\"40 CFR 141.61\"`)\n- `source` (`mirror` / `live`) reports provenance. `bodyTextNextOffset` marks a section longer than the window; read the rest through `regulations_get_cfr_section` with `offset`\n\n## Features\n\nBuilt on [`@cyanheads/mcp-ts-core`](https://github.com/cyanheads/mcp-ts-core): stdio and Streamable HTTP transports, pluggable auth (`none` / `jwt` / `oauth`), swappable storage (`in-memory`, `filesystem`, `Supabase`, `Cloudflare KV/R2/D1`), structured logging with optional OpenTelemetry tracing.\n\nFederal Register / eCFR / Regulations.gov-specific:\n\n- One workflow over three official sources: the agent calls regulatory verbs (`search_rules`, `get_cfr_section`, `find_comments`) rather than three API clients\n- Cross-source stitching: every Federal Register document surfaces its docket ID and CFR-part handles, which feed the proposal → comments → final rule → codified text trace\n- Keyless core: the five Federal Register and eCFR tools need no key. `regulations_get_docket` and `regulations_find_comments` need `REGULATIONS_GOV_API_KEY` (free at [api.data.gov/signup](https://api.data.gov/signup/), 1,000 requests/hour) and fail with `auth_required`, naming the variable and signup URL, when it is missing or rejected\n- Locally mirrored codified CFR: the eCFR syncs into embedded SQLite + FTS5 for exact-cite reads and full-text search, and falls back to the live API for historical dates, whole parts, appendices, titles outside the mirror, and titles eCFR has re-issued since the mirror last synced them\n- A 45-second budget per request, shared by every upstream call, retry, and backoff, so a stalled source answers with `upstream_unavailable` inside a client's timeout\n\nAgent-friendly output:\n\n- Provenance: `source: \"mirror\" | \"live\"` on every CFR read, plus a `sourceScope` line on search naming what the corpus covers\n- Honest paging: `totalPages` and `nextPage` say how far a list goes, a page past the end names the last page instead of reading as \"nothing matched\", and matches beyond the Federal Register's 50 pages or Regulations.gov's 40 surface through `truncated` and `notice`, never as silently dropped rows\n- Attachment-aware comments: `attachmentOnly` flags a comment whose substance is a file, with the download URLs\n\n## Getting started\n\n### Public Hosted Instance\n\nA public instance is available at `https://federal-regulations.caseyjhand.com/mcp` — no installation required. Point any MCP client at it via Streamable HTTP:\n\n```json\n{\n \"mcpServers\": {\n \"federal-regulations-mcp-server\": {\n \"type\": \"streamable-http\",\n \"url\": \"https://federal-regulations.caseyjhand.com/mcp\"\n }\n }\n}\n```\n\n### Self-Hosted / Local\n\nAdd the following to your MCP client configuration file. `REGULATIONS_GOV_API_KEY` enables the docket and comment tools; omit it to run the keyless Federal Register and eCFR tools alone.\n\n```json\n{\n \"mcpServers\": {\n \"federal-regulations-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"bunx\",\n \"args\": [\"@cyanheads/federal-regulations-mcp-server@latest\"],\n \"env\": {\n \"MCP_TRANSPORT_TYPE\": \"stdio\",\n \"MCP_LOG_LEVEL\": \"info\",\n \"REGULATIONS_GOV_API_KEY\": \"your-key-here\"\n }\n }\n }\n}\n```\n\nOr with npx (no Bun required):\n\n```json\n{\n \"mcpServers\": {\n \"federal-regulations-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"npx\",\n \"args\": [\"-y\", \"@cyanheads/federal-regulations-mcp-server@latest\"],\n \"env\": {\n \"MCP_TRANSPORT_TYPE\": \"stdio\",\n \"MCP_LOG_LEVEL\": \"info\",\n \"REGULATIONS_GOV_API_KEY\": \"your-key-here\"\n }\n }\n }\n}\n```\n\nOr with Docker:\n\n```json\n{\n \"mcpServers\": {\n \"federal-regulations-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"docker\",\n \"args\": [\n \"run\", \"-i\", \"--rm\",\n \"-e\", \"MCP_TRANSPORT_TYPE=stdio\",\n \"-e\", \"REGULATIONS_GOV_API_KEY=your-key-here\",\n \"ghcr.io/cyanheads/federal-regulations-mcp-server:latest\"\n ]\n }\n }\n}\n```\n\nFor Streamable HTTP, set the transport and start the server:\n\n```sh\nMCP_TRANSPORT_TYPE=http MCP_HTTP_PORT=3010 bun run start:http\n# Server listens at http://localhost:3010/mcp\n```\n\n### Prerequisites\n\n- [Bun v1.4.0](https://bun.sh/) or higher (or Node.js v24+).\n- Optional: a free [api.data.gov key](https://api.data.gov/signup/) for the Regulations.gov tools.\n\n### Installation\n\n1. **Clone the repository:**\n\n```sh\ngit clone https://github.com/cyanheads/federal-regulations-mcp-server.git\n```\n\n2. **Navigate into the directory:**\n\n```sh\ncd federal-regulations-mcp-server\n```\n\n3. **Install dependencies:**\n\n```sh\nbun install\n```\n\n4. **Configure environment:**\n\n```sh\ncp .env.example .env\n# optionally set REGULATIONS_GOV_API_KEY\n```\n\n## Configuration\n\n| Variable | Description | Default |\n|:---|:---|:---|\n| `REGULATIONS_GOV_API_KEY` | api.data.gov key for `regulations_get_docket` and `regulations_find_comments`. | none |\n| `FEDERAL_REGISTER_BASE_URL` | Federal Register API v1 base URL. | `https://www.federalregister.gov/api/v1` |\n| `ECFR_BASE_URL` | eCFR API base URL. | `https://www.ecfr.gov/api` |\n| `REGULATIONS_GOV_BASE_URL` | Regulations.gov API v4 base URL. | `https://api.regulations.gov/v4` |\n| `ECFR_MIRROR_PATH` | Path to the eCFR SQLite mirror database. | `./data/ecfr-mirror.sqlite` |\n| `ECFR_MIRROR_REFRESH_CRON` | Cron expression for an in-process mirror refresh (HTTP transport only), e.g. `0 4 * * 0`. Each run re-harvests every configured title in full. | none (no job) |\n| `ECFR_MIRROR_TITLES` | Comma-separated CFR titles to mirror (e.g. `21,40`). Reads and searches outside the set, and all-titles searches, go to the live eCFR API. | all 50 titles |\n| `MCP_TRANSPORT_TYPE` | Transport: `stdio` or `http`. | `stdio` |\n| `MCP_HTTP_PORT` | HTTP server port. | `3010` |\n| `MCP_AUTH_MODE` | Authentication: `none`, `jwt`, or `oauth`. | `none` |\n| `MCP_LOG_LEVEL` | Log level (`debug`, `info`, `warning`, `error`, etc.). | `info` |\n| `STORAGE_PROVIDER_TYPE` | Storage backend: `in-memory`, `filesystem`, `supabase`, `cloudflare-kv/r2/d1`. | `in-memory` |\n| `OTEL_ENABLED` | Enable [OpenTelemetry](https://github.com/cyanheads/mcp-ts-core/tree/main/docs/telemetry). | `false` |\n\nSee [`.env.example`](./.env.example) for the full list of optional overrides.\n\n## Running the server\n\n### Local development\n\n- **Build and run:**\n\n ```sh\n # One-time build\n bun run rebuild\n\n # Run the built server\n bun run start:stdio\n # or\n bun run start:http\n ```\n\n- **Build or refresh the eCFR mirror** (out of band and idempotent; the CFR tools use the live eCFR API until the first build completes):\n\n ```sh\n bun run mirror:init # full build, resumable (scope with ECFR_MIRROR_TITLES)\n bun run mirror:refresh # re-harvest every configured title against the latest eCFR issues\n bun run mirror:verify # report row counts and the last-synced issue date\n ```\n\n- **Run checks and tests:**\n\n ```sh\n bun run devcheck # Lint, format, typecheck, security, changelog sync\n bun run test # Vitest test suite\n ```\n\n### Docker\n\n```sh\ndocker build -t federal-regulations-mcp-server .\ndocker run --rm -e REGULATIONS_GOV_API_KEY=your-key -p 3010:3010 federal-regulations-mcp-server\n```\n\nThe Dockerfile defaults to HTTP transport, stateless session mode, and logs to `/var/log/federal-regulations-mcp-server`. Build the mirror inside a running container with `docker exec bun run mirror:init`, and mount a volume over `/usr/src/app/data` so it survives recreation. OpenTelemetry peer dependencies are installed by default; build with `--build-arg OTEL_ENABLED=false` to omit them.\n\n## Project structure\n\n| Directory | Purpose |\n|:---|:---|\n| `src/index.ts` | `createApp()` entry point: registers tools and resources, inits the three services, and schedules the mirror refresh when `ECFR_MIRROR_REFRESH_CRON` is set. |\n| `src/config` | Server-specific environment variable parsing and validation with Zod. |\n| `src/mcp-server/tools` | Tool definitions (`*.tool.ts`), the seven `regulations_*` tools. |\n| `src/mcp-server/resources` | Resource definitions (`*.resource.ts`), the document and CFR-section resources. |\n| `src/services/federal-register` | Federal Register API v1 client (keyless). |\n| `src/services/ecfr` | eCFR API client (keyless): versioner, structure, search, section XML parsing, and cite resolution. |\n| `src/services/ecfr-mirror` | eCFR codified-text mirror (SQLite + FTS5) and the opt-in refresh job. |\n| `src/services/regulations-gov` | Regulations.gov v4 client (`X-Api-Key`): dockets and comments. |\n| `src/services` | Shared request budget, text windowing, character-reference decoding, and upstream-failure handling. |\n| `scripts/ecfr-mirror-*.ts` | Out-of-band mirror lifecycle: `init`, `refresh`, `verify`. |\n| `tests/` | Unit and integration tests mirroring `src/`. |\n\n## Development guide\n\nSee [`CLAUDE.md`](./CLAUDE.md) for development guidelines and architectural rules. The short version:\n\n- Handlers throw, framework catches — no `try/catch` in tool logic\n- Use `ctx.log` for request-scoped logging, `ctx.state` for tenant-scoped storage\n- Register new tools and resources via the barrels in `src/mcp-server/*/definitions/index.ts`\n- Wrap external API calls: validate raw → normalize to the domain type → return the output schema; never fabricate missing upstream fields\n\n## Data disclaimer\n\neCFR content is \"authoritative but unofficial\" per the Office of the Federal Register, not the official legal edition of the Code of Federal Regulations; verify against [govinfo.gov](https://www.govinfo.gov/app/collection/cfr) for legal research. This server is not affiliated with or endorsed by the Office of the Federal Register, the Government Publishing Office, or the General Services Administration.\n\n## Contributing\n\nIssues are welcome. Run checks and tests before submitting:\n\n```sh\nbun run devcheck\nbun run test\n```\n\n## License\n\nApache-2.0 — see [LICENSE](LICENSE) for details.\n","readmeFilename":"README.md"}