emailfolders_mark_all_as_read · M365 MCP: Risk & Policy

WHAT IT DOES

What emailfolders_mark_all_as_read does on M365

AI agents use emailfolders_mark_all_as_read to create or update resources in M365 — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your M365 environment.

WHY IT NEEDS A POLICY

Why emailfolders_mark_all_as_read needs a policy

This tool modifies email read status across potentially large numbers of messages. While reversible (emails can be marked unread again), it represents a Write action that changes data state. Severity is medium because the blast radius is limited to email metadata and can be undone; it lacks the irreversibility of Destructive operations or the financial impact of Financial operations.

From the tool's definition Tool name 'emailfolders_mark_all_as_read' indicates a bulk modification operation on email folder state. The 'mark_as_read' action modifies email metadata (read/unread status) across potentially all emails in a folder.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

emailfolders_mark_all_as_read Rate-limited

emailfolders_mark_all_as_read 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": {
    "emailfolders_mark_all_as_read": {
      "limits": [
        {
          "counter": "emailfolders_mark_all_as_read_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 M365, so you can run agents against it safely.

FAQ

Questions about emailfolders_mark_all_as_read

What does the emailfolders_mark_all_as_read tool do? +

emailfolders_mark_all_as_read. It is categorised as a Write tool in the M365 MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on emailfolders_mark_all_as_read? +

Register the M365 MCP server in PolicyLayer and add a rule for emailfolders_mark_all_as_read: 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 M365. Nothing to install.

What risk level is emailfolders_mark_all_as_read? +

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

Can I rate-limit emailfolders_mark_all_as_read? +

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

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

emailfolders_mark_all_as_read is provided by the M365 MCP server (robin-collins/m365-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.