What is python-code-validator?

A plugin that checks Python files written by the coding agent for syntax errors, style issues, type problems, security-policy violations, and exposed credentials.

Use it when an agent creates Python code and you want automated checks for correctness, code quality, security, and leaked secrets.

It catches common code and security problems before you review or use the generated Python file, and reports the exact fix when available.

python-code-validator — Plugin by jkanselaar

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.

Claude Code

/plugin marketplace add jkanselaar/python-code-validator

agentmods

npx agentmods add plugins/jkanselaar/python-code-validator/plugin

Clone the repo

git clone --depth 1 https://github.com/jkanselaar/python-code-validator

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

python-code-validator 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 yesterday.

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.

plugin/.claude-plugin/plugin.json · 16 lines

What it actually says

{
  "name": "python-code-validator",
  "displayName": "Python Code Validator",
  "version": "1.0.0",
  "description": "Checks every Python file Claude writes, before you read it: syntax, lint, types, an AST security policy and a credential scan, with the exact fix when there is one.",
  "author": {
    "name": "StateMind",
    "url": "https://api.statemind.ai"
  },
  "homepage": "https://api.statemind.ai",
  "repository": "https://github.com/jkanselaar/python-code-validator",
  "license": "MIT",
  "keywords": ["python", "validation", "security", "lint", "code-quality"],
  "hooks": "./hooks/hooks.json"
}

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.

yesterday First seen · 16 lines scan A 88270c93af9f

Subscribe to this mod's changes

python-code-validator is a plugin published in the GitHub repository jkanselaar/python-code-validator (0 stars, last pushed 15d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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.

Code review Data and AI Security ai-agents code-quality gemini-cli-extension mcp mcp-server model-context-protocol

python-code-validator

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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