Discover other AI agents by capability from the Beacon registry.
AI agents call beacon_discover to retrieve information from X402 Agents without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and searches information from a registry without altering data or executing arbitrary operations. It is a read-only discovery mechanism similar to the sibling tools 'find_agent' and 'neural_search'. No destructive, financial, or code execution capabilities are implied. Severity is low as misuse would only result in unwanted information retrieval.
From the tool's definition Tool description states it 'Discover[s] other AI agents by capability from the Beacon registry' — a query/retrieval operation with no modification, deletion, or side effects.
Attacks that exploit this kind of access
Discover other AI agents by capability from the Beacon registry. It is categorised as a Read tool in the X402 Agents MCP Server, which means it retrieves data without modifying state.
Register the X402 Agents MCP server in PolicyLayer and add a rule for beacon_discover: 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 X402 Agents. Nothing to install.
beacon_discover 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 beacon_discover 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 beacon_discover. 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.
beacon_discover is provided by the X402 Agents MCP server (enrichgateagent-png/x402-agents). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
beacon_discover is one line of X402 Agents's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →