Semantic/neural web search for conceptual queries (Exa). Costs $0.012 per call via x402.
AI agents call neural_search 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 returns search results based on conceptual queries. It has no side effects on data state, cannot execute arbitrary commands, and does not delete or modify information. The only concern is the per-call cost, which represents API consumption rather than financial obligation.
From the tool's definition Tool performs 'Semantic/neural web search for conceptual queries' — a retrieval operation with no modification or deletion of data.
Attacks that exploit this kind of access
Semantic/neural web search for conceptual queries (Exa). Costs $0.012 per call via x402. 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 neural_search: 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.
neural_search 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 neural_search 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 neural_search. 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.
neural_search 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.
neural_search 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 →