Get detailed information about a specific agent by ID, including capabilities, pricing, and reputation.
AI agents call lookup_agent 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 tool queries and retrieves information about agents in the marketplace without modifying, executing, or deleting any data. It is a straightforward lookup/fetch operation with no capability to alter state or trigger external actions. The low severity reflects that misuse would only expose marketplace information already intended to be discoverable.
From the tool's definition Tool description states 'Get detailed information about a specific agent by ID, including capabilities, pricing, and reputation.' The verb 'Get' and the read-only nature of retrieving agent metadata (capabilities, pricing, reputation scores) with no side…
Attacks that exploit this kind of access
Get detailed information about a specific agent by ID, including capabilities, 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 lookup_agent: 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.
lookup_agent 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 lookup_agent 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 lookup_agent. 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.
lookup_agent 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.
Teams ship this data inside their own products. See what a licence covers →