forward-event · Outlook MCP Server MCP: Risk & Policy

WHAT IT DOES

What forward-event does on Outlook MCP Server

AI agents use forward-event 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 forward-event needs a policy

Forwarding an event is a Write operation because it creates new communication and extends the event's reach to additional recipients, but it does not delete, execute arbitrary code, move money, or cause destructive changes. The severity is medium because misuse could result in unintended calendar invitations or information disclosure to wrong recipients, but the effects are reversible and limited in scope.

From the tool's definition The tool 'forwards a calendar event to specified recipients', which creates a new communication artifact (the forwarded event) and modifies the distribution of calendar information to additional parties.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

forward-event Rate-limited

forward-event 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": {
    "forward-event": {
      "limits": [
        {
          "counter": "forward-event_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 forward-event

What does the forward-event tool do? +

Forwards a calendar event to specified recipients. 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 forward-event? +

Register the Outlook MCP Server MCP server in PolicyLayer and add a rule for forward-event: 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 forward-event? +

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

Can I rate-limit forward-event? +

Yes. Add a rate_limit block to the forward-event 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 forward-event completely? +

Set action: deny in the PolicyLayer policy for forward-event. 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 forward-event? +

forward-event 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.