AI agents call browser_get_frames to retrieve information from Selenium without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries the current page structure to enumerate frames/iframes, which is a read-only operation. It retrieves information about the DOM without modifying, executing code, or triggering external operations. The blast radius of misuse is minimal—an agent could only gain visibility into page structure.
From the tool's definition Tool name 'browser_get_frames' and description 'List all available frames/iframes on the page' indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
List all available frames/iframes on the page. It is categorised as a Read tool in the Selenium MCP Server, which means it retrieves data without modifying state.
Register the Selenium MCP server in PolicyLayer and add a rule for browser_get_frames: 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 Selenium. Nothing to install.
browser_get_frames 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_get_frames 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_get_frames. 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_get_frames is provided by the Selenium MCP server (raghvendra-raghuvanshi/selenium-mcp-server). 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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