gt_mail · Ruflo MCP: Risk & Policy

WHAT IT DOES

What gt_mail does on Ruflo

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

WHY IT NEEDS A POLICY

Why gt_mail needs a policy

The primary concern is the Send capability, which allows creation and dispatch of messages. While this is reversible (messages can theoretically be deleted or recalled in some systems), the impact of sending unauthorized or malicious internal communications could affect organizational workflows, impersonate users, or spread misinformation.

From the tool's definition Tool description states the tool can 'Send, read, or list Gas Town internal mail messages'. The 'Send' capability indicates the tool creates/modifies data by composing and transmitting messages.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

gt_mail Rate-limited

gt_mail 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": {
    "gt_mail": {
      "limits": [
        {
          "counter": "gt_mail_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 Ruflo, so you can run agents against it safely.

FAQ

Questions about gt_mail

What does the gt_mail tool do? +

Send, read, or list Gas Town internal mail messages. It is categorised as a Write tool in the Ruflo MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on gt_mail? +

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

What risk level is gt_mail? +

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

Can I rate-limit gt_mail? +

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

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

gt_mail is provided by the Ruflo MCP server (ruvnet/ruflo). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.