Search for agents by capability, category, or query. Returns a list of matching agents with their pricing and reputation.
AI agents call discover_agents to retrieve information from nullpath MCP Client without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a pure query/search tool that retrieves and displays information about available agents in a marketplace. It has no capability to modify, delete, or execute code. The blast radius of misuse is minimal—an AI agent could search exhaustively or retrieve metadata, but cannot cause financial harm, data destruction, or trigger external operations.
From the tool's definition Tool performs a search operation that 'returns a list of matching agents' with no indication of modifying data. The description emphasizes information retrieval ('search for agents', 'returns a list') with no side effects.
Attacks that exploit this kind of access
Search for agents by capability, category, or query. Returns a list of matching agents with their pricing and reputation. It is categorised as a Read tool in the nullpath MCP Client MCP Server, which means it retrieves data without modifying state.
Register the nullpath MCP Client MCP server in PolicyLayer and add a rule for discover_agents: 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 nullpath MCP Client. Nothing to install.
discover_agents 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_agents 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_agents. 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_agents is provided by the nullpath MCP Client MCP server (nullpath-labs/mcp-client). 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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