mark_seen · MCP Mail Organizer MCP: Risk & Policy

WHAT IT DOES

What mark_seen does on MCP Mail Organizer

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

WHY IT NEEDS A POLICY

Why mark_seen needs a policy

This operation reversibly updates email metadata (the seen/read status) without deleting data or executing external code. It is a write operation that can be undone by marking emails as unread again. While it modifies state, the blast radius is minimal—only email metadata changes. No data loss, code execution, or financial impact is possible.

From the tool's definition Tool name 'mark_seen' and description 'Mark emails as read or unread' indicate the tool modifies email state by changing the read/unread flag status.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mark_seen Rate-limited

mark_seen 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": {
    "mark_seen": {
      "limits": [
        {
          "counter": "mark_seen_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 Mail Organizer, so you can run agents against it safely.

FAQ

Questions about mark_seen

What does the mark_seen tool do? +

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

How do I enforce a policy on mark_seen? +

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

What risk level is mark_seen? +

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

Can I rate-limit mark_seen? +

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

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

mark_seen is provided by the MCP Mail Organizer MCP server (neomody77/mcp-mail-organizer). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.