python_check_types

THE RISK

Low Risk

Why python_check_types needs a policy

This tool runs a static type analysis (pyright) on Python code. It only reads and analyzes code without modifying files or executing application logic. It produces diagnostic output (type errors/warnings) but has no side effects on the codebase or external systems.

From the tool's definition Check Python types using pyright with watch and verbose mode support

Documented attack patterns abuse exactly the kind of access python_check_types gives an agent:

POLICY

How to control python_check_types

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP DevTools Server, and nothing reaches the server without passing your rules. This is the rule we recommend for python_check_types:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "python_check_types": {}
  }
}

python_check_types is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register MCP DevTools Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about python_check_types

What does the python_check_types tool do? +

Check Python types using pyright with watch and verbose mode support. It is categorised as a Read tool in the MCP DevTools Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on python_check_types? +

Register the MCP DevTools Server MCP server in PolicyLayer and add a rule for python_check_types: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MCP DevTools Server. Nothing to install.

What risk level is python_check_types? +

python_check_types is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit python_check_types? +

Yes. Add a rate_limit block to the python_check_types rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block python_check_types completely? +

Set action: deny in the PolicyLayer policy for python_check_types. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides python_check_types? +

python_check_types is provided by the MCP DevTools Server MCP server (rshade/mcp-devtools-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP DevTools Server tool call.

Start from MCP DevTools Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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