List all available tool categories and their descriptions
AI agents call list_tool_categories to retrieve information from Lighthouse MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about available tool categories without modifying, executing, or deleting any data. It is informational only, making it a Read operation with low severity risk.
From the tool's definition Tool name is 'list_tool_categories' and description states it 'List all available tool categories and their descriptions' — a pure retrieval operation with no side effects.
Attacks that exploit this kind of access
List all available tool categories and their descriptions. It is categorised as a Read tool in the Lighthouse MCP MCP Server, which means it retrieves data without modifying state.
Register the Lighthouse MCP server in PolicyLayer and add a rule for list_tool_categories: 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 Lighthouse MCP. Nothing to install.
list_tool_categories 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_tool_categories 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_tool_categories. 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_tool_categories is provided by the Lighthouse MCP server (mizchi/lighthouse-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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