Borrowing it
Nothing to install: this file belongs to paulieb89/govuk-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/paulieb89/govuk-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/paulieb89/govuk-mcpWrote 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.
[](https://agentmods.dev/instructions/paulieb89/govuk-mcp/claude-md)<a href="https://agentmods.dev/instructions/paulieb89/govuk-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/paulieb89/govuk-mcp/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.
<a href="https://agentmods.dev/instructions/paulieb89/govuk-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/paulieb89/govuk-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.01083 | $0.01083 |
| Opus 5 | $0.00541 | $0.00541 |
| Sonnet 5 | $0.00217 | $0.00217 |
| Haiku 4.5 | $0.00108 | $0.00108 |
Grade A, and why
govuk-mcp 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 96 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.
Project
govuk-mcp is an MCP server exposing UK government data through 7 read-only tools and 6 resource templates. All external APIs are public and require no authentication.
Tools
| Tool | What it does |
|---|---|
govuk_search |
Full-text search across GOV.UK's 700k+ content items |
govuk_grep_content |
Regex/substring search within a specific GOV.UK page body |
govuk_get_content |
Page metadata + navigable section index by base_path |
govuk_get_section |
Body HTML for a single named section (anchor) of a page |
govuk_get_organisation |
Full organisation profile by slug |
govuk_list_organisations |
Paginated list of all UK government organisations |
govuk_lookup_postcode |
Resolve a UK postcode to local authority, region, constituency |
govuk_get_content, govuk_get_section, and govuk_get_organisation are named companion tools (lesson 35 pattern) — they serve tool-only clients (ChatGPT, Ledgerhall proxy) with clean dict/Pydantic returns. Protocol-aware clients (Claude, Cursor) can use the equivalent govuk:// resources directly.
Resources (govuk:// URI templates)
For protocol-aware clients. Same underlying data as the companion tools, but URI-addressed and bounded.
| URI template | Returns |
|---|---|
govuk://content/{base_path*}/header |
Page metadata (title, doc type, dates) |
govuk://content/{base_path*}/index |
Section anchor:heading list |
govuk://content/{base_path*}/section/{anchor} |
Bounded HTML for one section |
govuk://content/{base_path*}/details/{field} |
Schema-specific details field (body, attachments, etc.) |
govuk://content/{base_path*}/links/{rel} |
Related content by link type |
govuk://organisation/{slug} |
Organisation profile |
Commands
uv sync --group dev # Install dependencies including dev/test tools
uv run govuk-mcp # Run server on http://localhost:8000/mcp
fly deploy # Deploy to Fly.io (https://govuk-mcp.fly.dev/mcp)
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.
- 10d ago First seen · 96 lines · 1,083 tokens per session scan A 8864dbfe2f51
govuk-mcp CLAUDE.md is an instructions file published in the GitHub repository paulieb89/govuk-mcp (3 stars, last pushed 1mo ago), licensed MIT. It adds 1,083 tokens to every session, about $0.0054 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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