What is fedreg-mcp-server CLAUDE.md?

A project guide for Claude Code working on a server that accesses three U.S. government regulation databases: the Federal Register, the electronic Code of Federal Regulations, and Regulations.gov. It explains the available commands, setup, tests, and build process.

It is for developing a tool that searches and runs queries against U.S. federal regulations data.

It tells the coding agent how the repository is organized and how to check changes with its TypeScript type checker, tests, linter, and build command.

How blen-labs/fedreg-mcp-server configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to blen-labs/fedreg-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/blen-labs/fedreg-mcp-server/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/blen-labs/fedreg-mcp-server

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/blen-labs/fedreg-mcp-server/claude-md/github.svg)](https://agentmods.dev/instructions/blen-labs/fedreg-mcp-server/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/blen-labs/fedreg-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/blen-labs/fedreg-mcp-server/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/blen-labs/fedreg-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/blen-labs/fedreg-mcp-server/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 3,564 This file is loaded in full into every session.

When invoked 3,564 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.03564	$0.03564
Opus 5	$0.01782	$0.01782
Sonnet 5	$0.00713	$0.00713
Haiku 4.5	$0.00356	$0.00356

Measured 8d ago against content hash acc4b46225bd, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

fedreg-mcp-server CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 99 lines

How it starts

The opening of the file, as written. The whole thing — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

What this is

@blen/fedreg-mcp-server — a "code-mode" MCP server for three U.S. government APIs: Federal Register (fr.*), eCFR (ecfr.*), and regulations.gov (regs.*). Instead of dozens of narrow tools it exposes exactly three — search_api, describe_schema, execute — and lets the model write TypeScript that runs in a locked-down sandbox with one global per source. Transports: stdio (default) and Streamable HTTP (--http).

Commands

Run everything from this directory ([email protected] pinned via packageManager; Node >= 20.10):

pnpm install
pnpm typecheck                          # tsc --noEmit — THE correctness gate; covers src/ AND test/
pnpm test                               # vitest run (all 12 spec files, ~1s, no network/keys needed)
pnpm test test/search.spec.ts           # single file (args forward to vitest, no -- needed)
pnpm test test/search.spec.ts -t "bm25" # single test by name (pair with file path to keep it fast)
pnpm lint                               # eslint . — minimal config (unused-vars only); passing means little
pnpm build                              # tsc -p tsconfig.build.json && (chmod +x dist/bin.js || true)
pnpm dev                                # tsx src/bin.ts (stdio)
pnpm dev --http                         # HTTP transport; also --port, --host, --sandbox, --insecure

In pnpm build, the || true guards only the chmod — a tsc failure DOES fail the build. pnpm typecheck remains the broader gate (it also covers test/**, which the build config excludes).
CI (.github/workflows/ci.yml) runs typecheck, lint, test, build in that order on Node 20 and 22, plus a Docker build. All four must pass; the PR template also requires them as checkboxes.
A green pnpm test on a machine with NO sandbox runner does not prove the sandbox works: sandbox-execution tests are gated on await runner.available() and silently no-op when no runner is present. CI compiles isolated-vm AND installs Deno, so both runners' gated tests execute there.

Read the full file on GitHub · 99 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

8d ago First seen · 99 lines · 3,564 tokens per session scan A acc4b46225bd

Subscribe to this mod's changes

fedreg-mcp-server CLAUDE.md is an instructions file published in the GitHub repository blen-labs/fedreg-mcp-server (2 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 3,564 tokens to every session, about $0.0178 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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fedreg-mcp-server: Instructions file for Claude Code