What is Python MCP Server Expert?

An expert assistant for developing MCP servers in Python. MCP is a standard way for AI agents to use external tools.

It is for designing, writing, and troubleshooting Python-based MCP servers.

It provides specialised help for building these servers in Python, a programming language commonly used for automation and data work.

How martynrees/Catalyst-MCP configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to martynrees/Catalyst-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.

Copy the file

curl -O https://raw.githubusercontent.com/martynrees/Catalyst-MCP/main/.github/agents/python-mcp-expert.agent.md

Clone the repo

git clone --depth 1 https://github.com/martynrees/Catalyst-MCP

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/agents/martynrees/catalyst-mcp/python-mcp-expert/github.svg)](https://agentmods.dev/agents/martynrees/catalyst-mcp/python-mcp-expert)

Your own site

<a href="https://agentmods.dev/agents/martynrees/catalyst-mcp/python-mcp-expert"><img src="https://agentmods.dev/badge/agents/martynrees/catalyst-mcp/python-mcp-expert/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/agents/martynrees/catalyst-mcp/python-mcp-expert"><img src="https://agentmods.dev/badge/agents/martynrees/catalyst-mcp/python-mcp-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 19 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,320 The whole file, excluding the scripts and references it only reads on demand.

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

Origin unknown 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	$0.00019	$0.01320
Opus 5.5	$0.00008	$0.00528
Sonnet 5.5	$0.00004	$0.00264
Haiku 4.5	$0.00002	$0.00132

Measured 2mo ago against content hash 654134d0bcfc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Python MCP Server Expert 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 2mo 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-expert.agent.md · 101 lines

The source is not reproduced here

No licence file

Read it on GitHub

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.

2mo ago First seen · 101 lines · 19 tokens per session scan A 654134d0bcfc

Subscribe to this mod's changes

Python MCP Server Expert is an agent published in the GitHub repository martynrees/Catalyst-MCP (0 stars, last pushed 9mo ago), with no licence file. It adds 19 tokens to every session and 1,320 once invoked, about $0.0001 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.

Building agents Languages Python

Python MCP Server Expert next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
Python MCP Server Expertmartynrees/Catalyst-MCP	Agent	0	9mo ago	none	A	19	Claude Code
Geoprocessing SpecialistSHAdd0WTAka/Zen-Ai-Pentest	Agent	503	3d ago	MIT	A	45	Claude Code, OpenCode
python-proechoVic/blade-code	Agent	181	24d ago	MIT	A	51	Claude Code
temporal-test-buildercanonical/copilot-collections	Agent	32	3d ago	Apache-2.0	A	56	Claude Code
package-revieweroborchers/fractional-cto	Agent	36	12d ago	MIT	A	287	Claude Code
script-operatorMadGraphTeam/MadAgents	Agent	15	3mo ago	MIT	A	24	Claude Code
python-reviewerFmarzochi/EGC	Agent	68	yesterday	Apache-2.0	A	43	Claude Code, Kiro

Catalyst-MCP: Agent for Claude Code