end_codegen_session · Playwright MCP Server MCP

WHAT IT DOES

What end_codegen_session does on Playwright MCP Server

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

WHY IT NEEDS A POLICY

Why end_codegen_session needs a policy

This tool ends a session and generates (creates) a test file on disk. It is a Write operation as it creates a new file. It is not Destructive since generating a file is reversible (the file can be deleted). Severity is medium because an AI agent misusing this could generate unintended test files, but the blast radius is limited.

From the tool's definition End a code generation session and generate the test file

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

end_codegen_session Rate-limited

end_codegen_session 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": {
    "end_codegen_session": {
      "limits": [
        {
          "counter": "end_codegen_session_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 Playwright MCP Server, so you can run agents against it safely.

FAQ

Questions about end_codegen_session

What does the end_codegen_session tool do? +

End a code generation session and generate the test file. It is categorised as a Write tool in the Playwright 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 end_codegen_session? +

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

What risk level is end_codegen_session? +

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

Can I rate-limit end_codegen_session? +

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

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

end_codegen_session is provided by the Playwright MCP Server MCP server (vinothbhc1986/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.