AI agents call get_metrics to retrieve information from Browserless MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read operation that retrieves metrics (performance data, session information, or statistics) from the Browserless service. It has no side effects, does not modify data, and does not execute external operations. The classification as Read is appropriate for any tool whose primary function is data retrieval.
From the tool's definition Tool name 'get_metrics' and description 'Get metrics' indicate a retrieval operation. The verb 'get' combined with sibling tools that perform actions (generate_pdf, execute_browserql, execute_function, export_page) suggests this reads data without…
Documented attack patterns abuse exactly the kind of access get_metrics gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Browserless MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_metrics:
{
"version": "1",
"default": "deny",
"tools": {
"get_metrics": {}
}
}get_metrics is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get metrics. It is categorised as a Read tool in the Browserless MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Browserless MCP Server MCP server in PolicyLayer and add a rule for get_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 Browserless MCP Server. Nothing to install.
get_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_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_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_metrics is provided by the Browserless MCP Server MCP server (lizzard-solutions/browserless-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Browserless MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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16 Browserless MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.