AI agents call search_users to retrieve information from EspoCRM-MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries user information from the EspoCRM database without creating, modifying, deleting, or executing any operations. It is a straightforward read-only search function with minimal security risk if misused by an AI agent, as it only exposes existing user data that may already be discoverable through other means.
From the tool's definition Tool name is 'search_users' and description states it 'Search for users in the EspoCRM system' — a query operation with no modification or deletion of data.
Documented attack patterns abuse exactly the kind of access search_users gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and EspoCRM-MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for search_users:
{
"version": "1",
"default": "deny",
"tools": {
"search_users": {}
}
}search_users is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Search for users in the EspoCRM system. It is categorised as a Read tool in the EspoCRM-MCP MCP Server, which means it retrieves data without modifying state.
Register the EspoCRM- 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 EspoCRM-MCP. 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 EspoCRM- MCP server (zaphod-black/espomcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 46 EspoCRM-MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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46 EspoCRM-MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.