mypy

Runs mypy and returns structured type-check diagnostics (file, line, severity, message, code).

SERVERGo SOURCEDave-London/Pare

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-dave-london-go/mypy.md

WHAT IT DOES

What mypy does on Go

AI agents invoke mypy to trigger actions in Go. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why mypy is rated High

The tool actively runs an external program (mypy) on the filesystem. While it is read-like in intent (reporting diagnostics), it executes an external process whose behavior depends on arguments and the codebase state. No data is written or deleted, but execution of external tooling places it in the Execute category above Read.

From the tool's definition 'Runs mypy' — executes the mypy type-checker as an external process against code files

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs mypy safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Go, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For mypy, this is the rule to start with:

mypy Rate-limited

mypy stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mypy": {
      "limits": [
        {
          "counter": "mypy_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Go, apply this rule, and every mypy call is checked against it from then on.

FAQ

Questions about mypy

What does the mypy tool do? +

Runs mypy and returns structured type-check diagnostics (file, line, severity, message, code). It is categorised as a Execute tool in the Go MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on mypy? +

Register the Go MCP server in PolicyLayer and add a rule for mypy: 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 Go. Nothing to install.

What risk level is mypy? +

mypy is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit mypy? +

Yes. Add a rate_limit block to the mypy 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 mypy completely? +

Set action: deny in the PolicyLayer policy for mypy. 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 mypy? +

mypy is provided by the Go MCP server (Dave-London/Pare). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Go, and thousands of servers like it.

This server

All 202 Go tools → High-risk tools on this server →

Across the catalogue

All high-risk MCP tools → The MCP Attack Database →

Guides

Govern code and CI agents →Agent sandbox →Least privilege for MCP →