Extract outerHTML from a selector.
AI agents call browser.extract_html to retrieve information from MCP Playwright Browser without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves HTML data from the DOM based on a CSS selector, producing no side effects or state changes. It is a passive data extraction operation that falls clearly within the Read category. Severity is low because HTML extraction alone poses minimal risk—the extracted data depends on what the user is accessing, but the tool itself cannot delete data, execute arbitrary code, or move money.
From the tool's definition Tool name 'extract_html' and description 'Extract outerHTML from a selector' indicates retrieval of HTML content from a web page without modification or execution of code.
Attacks that exploit this kind of access
Extract outerHTML from a selector. It is categorised as a Read tool in the MCP Playwright Browser MCP Server, which means it retrieves data without modifying state.
Register the MCP Playwright Browser MCP server in PolicyLayer and add a rule for browser.extract_html: 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 Playwright Browser. Nothing to install.
browser.extract_html is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the browser.extract_html 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 browser.extract_html. 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.
browser.extract_html is provided by the MCP Playwright Browser MCP server (mhrnqaruni/mcp-playwright-browser). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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