mail__delete_message

THE RISK

Critical Risk

Why mail__delete_message needs a policy

This tool irreversibly removes email messages from the user's inbox. Permanent deletion cannot be undone. An AI agent with access could maliciously or accidentally destroy important emails, customer records, evidence, or communications.

From the tool's definition Tool name contains 'delete' and description states 'Permanently delete an email from inbox' — the words 'permanently delete' indicate irreversible data destruction.

Documented attack patterns abuse exactly the kind of access mail__delete_message gives an agent:

POLICY

How to control mail__delete_message

PolicyLayer is an MCP gateway — it sits between your AI agents and Proton-MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for mail__delete_message:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "mail__delete_message"
  ]
}

mail__delete_message disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register Proton-MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

Critical-risk tools in Proton-MCP → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about mail__delete_message

What does the mail__delete_message tool do? +

Permanently delete an email from inbox. It is categorised as a Destructive tool in the Proton-MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on mail__delete_message? +

Register the Proton- MCP server in PolicyLayer and add a rule for mail__delete_message: 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 Proton-MCP. Nothing to install.

What risk level is mail__delete_message? +

mail__delete_message is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit mail__delete_message? +

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

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

mail__delete_message is provided by the Proton- MCP server (jorgenclaw/proton-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Proton-MCP tool call.

Start from Proton-MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →