create_agent_identity · MCP Agent Mail MCP: Risk & Policy

WHAT IT DOES

What create_agent_identity does on MCP Agent Mail

AI agents use create_agent_identity to create or update resources in MCP Agent Mail — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP Agent Mail environment.

WHY IT NEEDS A POLICY

Why create_agent_identity needs a policy

Creating an agent identity is a write operation that adds a new record to the system. While reversible (unlike destructive operations), it modifies the coordination layer's state and could affect multi-agent workflows if misused. Medium severity reflects potential for disruption in a multi-agent environment without irreversible harm.

From the tool's definition Tool name 'create_agent_identity' suggests creating a new identity entity. The server provides 'identities, message threading, and searchable history' as core features, indicating identity management is a data creation operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_agent_identity Rate-limited

create_agent_identity stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_agent_identity": {
      "limits": [
        {
          "counter": "create_agent_identity_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP Agent Mail, so you can run agents against it safely.

FAQ

Questions about create_agent_identity

What does the create_agent_identity tool do? +

create_agent_identity. It is categorised as a Write tool in the MCP Agent Mail MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_agent_identity? +

Register the MCP Agent Mail MCP server in PolicyLayer and add a rule for create_agent_identity: 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 MCP Agent Mail. Nothing to install.

What risk level is create_agent_identity? +

create_agent_identity is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create_agent_identity? +

Yes. Add a rate_limit block to the create_agent_identity 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.

How do I block create_agent_identity completely? +

Set action: deny in the PolicyLayer policy for create_agent_identity. 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.

What MCP server provides create_agent_identity? +

create_agent_identity is provided by the MCP Agent Mail MCP server (omelchmichael/mcp_agent_mail). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.