Get performance metrics from the browser
AI agents call get_performance_metrics to retrieve information from Browser MCP Bridge without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves performance telemetry data from the browser without modifying state, executing code, or triggering external operations. It is purely informational and poses minimal risk even if invoked by an untrusted agent, as it cannot cause harm or change system behavior. Classified as Read with low severity.
From the tool's definition Tool name 'get_performance_metrics' and description 'Get performance metrics from the browser' indicate data retrieval with no modification or execution capabilities.
Attacks that exploit this kind of access
Get performance metrics from the browser. It is categorised as a Read tool in the Browser MCP Bridge MCP Server, which means it retrieves data without modifying state.
Register the Browser MCP Bridge MCP server in PolicyLayer and add a rule for get_performance_metrics: 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 Browser MCP Bridge. Nothing to install.
get_performance_metrics 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 get_performance_metrics 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 get_performance_metrics. 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.
get_performance_metrics is provided by the Browser MCP Bridge MCP server (robhicks/browser-mcp-bridge). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
get_performance_metrics is one line of Browser MCP Bridge's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →