modelcontextprotocol/python-sdk is the official Python toolkit for building Model Context Protocol servers and clients, which let large-language-model applications access standardized tools, data, and prompts. It is for developers creating MCP integrations, and the catalogue entries provide instructions, skills, and commands for working with it.
Borrowing it
Nothing to install: this file belongs to modelcontextprotocol/python-sdk. 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/modelcontextprotocol/python-sdk/main/AGENTS.mdgit clone --depth 1 https://github.com/modelcontextprotocol/python-sdkWrote 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/modelcontextprotocol/python-sdk/agents-md)<a href="https://agentmods.dev/instructions/modelcontextprotocol/python-sdk/agents-md"><img src="https://agentmods.dev/badge/instructions/modelcontextprotocol/python-sdk/agents-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/modelcontextprotocol/python-sdk/agents-md"><img src="https://agentmods.dev/badge/instructions/modelcontextprotocol/python-sdk/agents-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 | $0.02207 | $0.02207 |
| Opus 5.5 | $0.00883 | $0.00883 |
| Sonnet 5.5 | $0.00441 | $0.00441 |
| Haiku 4.5 | $0.00221 | $0.00221 |
Grade A, and why
python-sdk AGENTS.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 17d 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 — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Development Guidelines
Note for AI Agents
If you are an AI coding agent acting for someone who is not a maintainer of
this repository, read CONTRIBUTING.md before opening issues or pull
requests here. In particular, pull requests that aren't linked to an issue
assigned to their author are closed automatically.
Branching Model
mainis the current stable line (v2); releases are cut from it (seeRELEASE.md).- v2 is released; its public API is a compatibility contract for the 2.x
line. Removals, renames, or any change to an existing API's signature or
observable behaviour (including ones softened by a
@deprecatedshim) is a design decision a maintainer makes explicitly, and should generally be avoided. docs/migration.mdis the v1 → v2 record and is closed to new entries. Correcting errors or improving clarity in what's there is fine.v1.xis the maintenance branch for the previous major. Backport PRs target it and use a[v1.x]title prefix; only critical bug fixes and security fixes land there.README.mddocuments v2. The v1 README lives on thev1.xbranch.
Package Management
- ONLY use uv, NEVER pip
- Installation:
uv add <package>. Exception: the root project's runtime dependencies are dynamic (the publishedmcpwheel exact-pinsmcp-types), souv addcannot edit them — add the requirement to[tool.hatch.metadata.hooks.uv-dynamic-versioning].dependenciesinpyproject.tomlby hand, then runuv lock. Dependency groups, extras, and the example packages still take plainuv add. - Running tools:
uv run --frozen <tool>. Always pass--frozenso uv doesn't rewriteuv.lockas a side effect. - Cross-version testing:
uv run --frozen --python 3.11 pytest ...to run against a specific interpreter (CI covers 3.11–3.15). - Upgrading:
uv lock --upgrade-package <package> - FORBIDDEN:
uv pip install,@latestsyntax - Don't raise dependency floors for CVEs alone. The
>=constraint already lets users upgrade. Only raise a floor when the SDK needs functionality from the newer version, and don't add SDK code to work around a dependency's vulnerability. See Kludex/uvicorn#2643 and python-sdk #1552 for reasoning.
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.
- 17d ago Changed cbcf162fd2b3
- 2mo ago First seen · 167 lines · 2,207 tokens per session scan A 26457e8cd68b
python-sdk AGENTS.md is an instructions file published in the GitHub repository modelcontextprotocol/python-sdk (24,708 stars, last pushed 3d ago), licensed MIT. It adds 2,207 tokens to every session, about $0.0088 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 2026-08-30.
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