Lists all WebMCP tools the page exposes.
AI agents call list_webmcp_tools to retrieve information from Chrome Devtools without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a reconnaissance/query operation that enumerates tools exposed by a web page. It retrieves information about what is available but does not modify data, execute arbitrary operations, or cause side effects. The blast radius if misused is minimal—an attacker gains visibility of available tools but not direct access to invoke them or cause damage. This clearly fits the Read category.
From the tool's definition Tool name 'list_webmcp_tools' and description 'Lists all WebMCP tools the page exposes' indicate retrieval/inspection of available tools without modification or execution of those tools.
Attacks that exploit this kind of access
Lists all WebMCP tools the page exposes. It is categorised as a Read tool in the Chrome Devtools MCP Server, which means it retrieves data without modifying state.
Register the Chrome Devtools MCP server in PolicyLayer and add a rule for list_webmcp_tools: 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 Chrome Devtools. Nothing to install.
list_webmcp_tools 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 list_webmcp_tools 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 list_webmcp_tools. 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.
list_webmcp_tools is provided by the Chrome Devtools MCP server (zhang77-x/chrpme_mcp). 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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