Borrowing it
Nothing to install: this file belongs to jaredthivener/fastapi-docs-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/jaredthivener/fastapi-docs-mcp/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/jaredthivener/fastapi-docs-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/jaredthivener/fastapi-docs-mcp/copilot-instructions)<a href="https://agentmods.dev/instructions/jaredthivener/fastapi-docs-mcp/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/jaredthivener/fastapi-docs-mcp/copilot-instructions/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/jaredthivener/fastapi-docs-mcp/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/jaredthivener/fastapi-docs-mcp/copilot-instructions.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 | $0.01314 | $0.01314 |
| Opus 5.5 | $0.00526 | $0.00526 |
| Sonnet 5.5 | $0.00263 | $0.00263 |
| Haiku 4.5 | $0.00131 | $0.00131 |
Grade A, and why
fastapi-docs-mcp copilot-instructions.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 1mo 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 — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.
FastAPI Docs MCP Server — AI Agent Guide
Project Overview
FastAPI Docs MCP is a Model Context Protocol server providing real-time
access to FastAPI documentation. It exposes 6 read-only tools:
get_fastapi_docs, search_fastapi_docs, list_fastapi_pages,
get_fastapi_example, compare_fastapi_approaches, and
get_fastapi_best_practices — see AGENTS.md for the full
tool contract (signatures, return shape, error semantics).
The implementation is a small package under src/fastapi_docs_mcp/, not a
single file. Each module is one layer:
| Module | Responsibility |
|---|---|
config.py |
Every magic value (URLs, allowlist, timeouts, limits) in one place |
http.py |
The single network choke point: host allowlist (enforced post-redirect), size cap, timeout |
cache.py |
TTL + LRU cache with single-flight de-duplication |
sitemap.py |
Discovery — the sitemap is the only source of page-path truth, plus keyword aliases |
markdown.py |
Preferred content path: raw GitHub markdown, include-directive resolution, MkDocs-syntax cleanup |
html.py |
Fallback-only content path: regex text/code extraction from the rendered site |
content.py |
Orchestrates markdown-then-HTML fallback; the one place that distinguishes a confirmed-absent page (None) from an unreachable one (ToolError) |
app.py |
The shared FastMCP instance, tool annotations, lifespan (closes the HTTP client) |
server.py |
Logging setup, imports tools to register it, run() |
tools.py |
The 6 @mcp.tool functions — thin orchestration + response formatting |
Key Architecture Patterns
Markdown-preferred, HTML-fallback content
content.py fetches FastAPI's raw markdown from GitHub first (token-efficient,
preserves code fences) and only falls back to parsing the rendered HTML page
if markdown is unavailable. This is the resilience guarantee: an upstream
change to one source degrades gracefully instead of breaking the tool.
No HTML parsing library
html.py uses re.sub() regex passes rather than BeautifulSoup/lxml — it is
the fallback path only (exercised when markdown fails), kept deliberately
lean and covered by hypothesis property tests (tests/test_html.py).
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.
- 1mo ago Changed · +17 lines · +110 tokens per session 102b1379e66d
- 1mo ago First seen · 82 lines · 1,204 tokens per session scan A 9253fd9430cc
fastapi-docs-mcp copilot-instructions.md is an instructions file published in the GitHub repository jaredthivener/fastapi-docs-mcp (4 stars, last pushed 2d ago), licensed MIT. It adds 1,314 tokens to every session, about $0.0053 per session on Opus 5.5. 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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