End a code generation session and generate the test file
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.
This tool generates and writes test code to a file, representing a create/write operation. It is not destructive (the file can be deleted), not financial, and not execute-tier dangerous (it generates code rather than executing it). The blast radius is low because test file generation is a controlled, reversible operation with minimal side effects beyond disk I/O.
From the tool's definition Tool description states 'generate the test file' which creates a new artifact (test code file). The action is reversible—generated files can be deleted or regenerated.
Documented attack patterns abuse exactly the kind of access end_codegen_session gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Playwright MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for end_codegen_session:
{
"version": "1",
"default": "deny",
"tools": {
"end_codegen_session": {
"limits": [
{
"counter": "end_codegen_session_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}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.
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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.
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.
end_codegen_session is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
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.
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.
end_codegen_session is provided by the Playwright MCP Server MCP server (pvinis/mcp-playwright-stealth). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Playwright MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
29 Playwright MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.