browser_screen_capture · Playwright MCP: Risk & Policy

WHAT IT DOES

What browser_screen_capture does on Playwright MCP

AI agents call browser_screen_capture to retrieve information from Playwright MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

WHY IT NEEDS A POLICY

Why browser_screen_capture needs a policy

This tool only reads/captures the current visual state of the browser page. It does not modify any data, execute code, or trigger external operations. It is a pure read/snapshot action.

From the tool's definition 'Take a screenshot of the current page' — captures visual state, no side effects

Attacks that exploit this kind of access

Questions about browser_screen_capture

What does the browser_screen_capture tool do? +

Take a screenshot of the current page. It is categorised as a Read tool in the Playwright MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on browser_screen_capture? +

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

What risk level is browser_screen_capture? +

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

Can I rate-limit browser_screen_capture? +

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

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

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