external_reference_external_references \u00b7 POST /externalReferenceExternalReferences/searchByFields \u2014 Get object by connection. Required: from, size, q.
AI agents call external_reference_external_references_search_by_fields to retrieve information from Vicarius vRx MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves external reference data based on search criteria without modifying, deleting, or executing operations. It is a query operation that returns results based on pagination and search parameters. The read-only enforcement on the server confirms no side effects are possible.
From the tool's definition Tool performs a search operation via POST /externalReferenceExternalReferences/searchByFields with parameters 'from', 'size', and 'q' (query). The name contains 'search' and description indicates retrieval of objects by connection criteria.
Attacks that exploit this kind of access
external_reference_external_references \u00b7 POST /externalReferenceExternalReferences/searchByFields \u2014 Get object by connection. Required: from, size, q. It is categorised as a Read tool in the Vicarius vRx MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Vicarius vRx MCP Server MCP server in PolicyLayer and add a rule for external_reference_external_references_search_by_fields: 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 Vicarius vRx MCP Server. Nothing to install.
external_reference_external_references_search_by_fields 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 external_reference_external_references_search_by_fields 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 external_reference_external_references_search_by_fields. 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.
external_reference_external_references_search_by_fields is provided by the Vicarius vRx MCP Server MCP server (space-c0wboy/vicarius-vrx-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.
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