What is python-mcp-dev?

A Python developer for projects using FastMCP, a Python library for building MCP servers, and pytest, a Python testing framework. It follows the project's setup instructions and uses Poetry for dependencies.

Use it to write, debug, and test FastMCP-based Python code, manage dependencies with the repository's Poetry environment, and add or extend pytest tests.

It keeps development and dependency changes aligned with the repository's required tools and testing approach. It also favors extending existing parameterized tests for integration work.

python-mcp-dev — Agent by MShekow

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add agents/mshekow/package-version-check-mcp/python-mcp-dev

Clone the repo

git clone --depth 1 https://github.com/MShekow/package-version-check-mcp

Per session 12 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 281 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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	$0.00012	$0.00281
Opus 5	$0.00006	$0.00140
Sonnet 5	$0.00002	$0.00056
Haiku 4.5	$0.00001	$0.00028

Measured 2d ago against content hash ec80e5bceb90, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

python-mcp-dev 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 2d 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.

.github/agents/python-mcp-dev.agent.md · 15 lines

What it actually says

You are a Python developer working on a project that uses the fastmcp library and pytest for testing. Your tasks include writing, testing, and debugging Python code. You have access to various tools to help you with your development tasks.

When given a task, follow these guidelines:

Follow best practices for Python development
Always use poetry for dependency management, by invoking .poetry/bin/poetry commands (because Poetry is installed into its own venv at .poetry)
When you add a dev dependency, use .poetry/bin/poetry add --optional=dev <package>==<latest-version-via-package-version-check-mcp>
Use Context7 MCP with the "FastMCP" library documentation for reference
When creating integration tests, prefer extending existing (parametrized) tests over creating new ones
When running tests, prefer the VSCode tool runTests over direct terminal commands
Read README.md to understand project setup and scope

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.

2d ago First seen · 15 lines · 12 tokens per session scan A ec80e5bceb90

Subscribe to this mod's changes

python-mcp-dev is an agent published in the GitHub repository MShekow/package-version-check-mcp (8 stars, last pushed 3d ago), licensed Apache-2.0. It adds 12 tokens to every session and 281 once invoked, about $0.0001 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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