Discover which MCP tools are available for a given task. Returns the most relevant tool names, servers, and descriptions based on your natural language query. Call this before using an unfamiliar tool to find the right one.
AI agents call discover_tools to retrieve information from Open Brain MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and searches metadata about available tools in a registry without modifying, deleting, or executing any operations. It is purely informational and presents no risk of unintended consequences to data or systems.
From the tool's definition Tool description states it 'Returns the most relevant tool names, servers, and descriptions based on your natural language query' and is meant to 'Discover which MCP tools are available.' This is a discovery/query operation with no side effects.
Attacks that exploit this kind of access
Discover which MCP tools are available for a given task. Returns the most relevant tool names, servers, and descriptions based on your natural language query. Call this before using an unfamiliar tool to find the right one. It is categorised as a Read tool in the Open Brain MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Open Brain MCP Server MCP server in PolicyLayer and add a rule for discover_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 Open Brain MCP Server. Nothing to install.
discover_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 discover_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 discover_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.
discover_tools is provided by the Open Brain MCP Server MCP server (subwizzll/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.
Teams ship this data inside their own products. See what a licence covers →