generate_tests · MCP Server MCP: Risk & Policy

WHAT IT DOES

What generate_tests does on MCP Server

AI agents use generate_tests to create or update resources in MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP Server environment.

WHY IT NEEDS A POLICY

Why generate_tests needs a policy

The tool generates test code files, which is a reversible write operation. While test generation itself is relatively safe, it creates new files/content in the codebase that can be modified or deleted, placing it in the Write category rather than Read. Severity is medium because the generated tests are subject to human review before integration and don't directly alter production code or business logic.

From the tool's definition Tool name 'generate_tests' and description 'Gera testes para um arquivo de código' (Generates tests for a code file) indicates creation of test files as output, which constitutes writing/creating new data artifacts.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_tests Rate-limited

generate_tests stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "generate_tests": {
      "limits": [
        {
          "counter": "generate_tests_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP Server, so you can run agents against it safely.

FAQ

Questions about generate_tests

What does the generate_tests tool do? +

Gera testes para um arquivo de código. It is categorised as a Write tool in the MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on generate_tests? +

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

What risk level is generate_tests? +

generate_tests is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit generate_tests? +

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

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

generate_tests is provided by the MCP Server MCP server (kelvis-santos/mcp-vscode-examples). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.