compose_email · MCP-server MCP: Risk & Policy

WHAT IT DOES

What compose_email does on MCP-server

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

WHY IT NEEDS A POLICY

Why compose_email needs a policy

Composing and sending an email is a Write operation that creates and sends a new message. Given the server's email automation context, this likely sends emails, which could have significant impact if misused (e.g., sending emails to unintended recipients). The empty description lowers confidence, but the name strongly implies email creation/sending.

From the tool's definition Tool name 'compose_email' in context of an email automation server (Outlook). Description is empty, lowering confidence.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

compose_email Rate-limited

compose_email 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": {
    "compose_email": {
      "limits": [
        {
          "counter": "compose_email_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-server, so you can run agents against it safely.

FAQ

Questions about compose_email

What does the compose_email tool do? +

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

How do I enforce a policy on compose_email? +

Register the MCP-server MCP server in PolicyLayer and add a rule for compose_email: 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-server. Nothing to install.

What risk level is compose_email? +

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

Can I rate-limit compose_email? +

Yes. Add a rate_limit block to the compose_email 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 compose_email completely? +

Set action: deny in the PolicyLayer policy for compose_email. 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 compose_email? +

compose_email is provided by the MCP-server MCP server (prathapmahi/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.