generate_draft_reply · Email MCP Server MCP: Risk & Policy

WHAT IT DOES

What generate_draft_reply does on Email MCP Server

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

WHY IT NEEDS A POLICY

Why generate_draft_reply needs a policy

The tool generates and creates draft email replies, which is a Write operation (creates data reversibly). It does not delete data (Destructive), execute arbitrary code (Execute), or move money (Financial). Severity is medium because misuse could send embarrassing or incorrect replies if the draft is subsequently sent via 'send_email', but the draft itself is reversible and does not automatically transmit.

From the tool's definition Tool description states 'Generate an AI-powered draft reply to an email' and server description mentions 'generate AI-powered draft replies' and 'manage your inbox'. The sibling tool 'send_email' indicates this server can modify email state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_draft_reply Rate-limited

generate_draft_reply 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": {
    "generate_draft_reply": {
      "limits": [
        {
          "counter": "generate_draft_reply_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about generate_draft_reply

What does the generate_draft_reply tool do? +

Generate an AI-powered draft reply to an email using Claude. It is categorised as a Write tool in the Email 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 generate_draft_reply? +

Register the Email MCP Server MCP server in PolicyLayer and add a rule for generate_draft_reply: 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 Email MCP Server. Nothing to install.

What risk level is generate_draft_reply? +

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

Can I rate-limit generate_draft_reply? +

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

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

generate_draft_reply is provided by the Email MCP Server MCP server (sgroi-l/email-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.