AI agents call user_search to retrieve information from Ashby MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query operation to retrieve user information based on search criteria. It returns data without side effects, modifying, executing code, or destructing data. The blast radius of misuse is minimal—an attacker could enumerate users in the Ashby system but cannot escalate beyond information disclosure.
From the tool's definition Tool description explicitly states 'Search for users by email or name' with no modification, deletion, or execution capabilities mentioned. The verb 'search' and context of querying user data indicates retrieval only.
Attacks that exploit this kind of access
Search for users by email or name. It is categorised as a Read tool in the Ashby MCP MCP Server, which means it retrieves data without modifying state.
Register the Ashby MCP server in PolicyLayer and add a rule for user_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 Ashby MCP. Nothing to install.
user_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 user_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 user_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.
user_search is provided by the Ashby MCP server (jaketeagle/ashby-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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