reply-all-email · Outlook MCP Server MCP: Risk & Policy

WHAT IT DOES

What reply-all-email does on Outlook MCP Server

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

WHY IT NEEDS A POLICY

Why reply-all-email needs a policy

This tool creates new email content and sends it to multiple recipients (all original recipients of the email thread). While it does not delete or destroy data (Destructive), does not execute arbitrary code (Execute), and does not move money (Financial), it does create and transmit new data with side effects—specifically, it sends communications to other parties.

From the tool's definition Tool name 'reply-all-email' and description 'Replies to all recipients of an email' indicate the tool creates and sends a new email message, modifying the email thread by adding a response.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

reply-all-email Rate-limited

reply-all-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": {
    "reply-all-email": {
      "limits": [
        {
          "counter": "reply-all-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 Outlook MCP Server, so you can run agents against it safely.

FAQ

Questions about reply-all-email

What does the reply-all-email tool do? +

Replies to all recipients of an email. It is categorised as a Write tool in the Outlook 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 reply-all-email? +

Register the Outlook MCP Server MCP server in PolicyLayer and add a rule for reply-all-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 Outlook MCP Server. Nothing to install.

What risk level is reply-all-email? +

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

Can I rate-limit reply-all-email? +

Yes. Add a rate_limit block to the reply-all-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 reply-all-email completely? +

Set action: deny in the PolicyLayer policy for reply-all-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 reply-all-email? +

reply-all-email is provided by the Outlook MCP Server MCP server (peacockery-studio/outlook-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.