Vitally tool to search for users by email or external ID
AI agents call search_users to retrieve information from Vitally 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 user records based on search criteria (email or external ID). It is a read-only query operation that does not create, modify, delete, or execute any code. The blast radius of misuse is limited to unauthorized data discovery, not data modification or loss.
From the tool's definition Tool name is 'search_users' and description states it 'search[es] for users by email or external ID' — a query operation with no side effects.
Attacks that exploit this kind of access
Vitally tool to search for users by email or external ID. It is categorised as a Read tool in the Vitally MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Vitally MCP Server MCP server in PolicyLayer and add a rule for search_users: 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 Vitally MCP Server. Nothing to install.
search_users 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 search_users 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 search_users. 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.
search_users is provided by the Vitally MCP Server MCP server (johnjjung/vitally-mcp). 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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