fal-cancel · Mcp Gmail MCP: Risk & Policy

WHAT IT DOES

What fal-cancel does on Mcp Gmail

AI agents invoke fal-cancel to trigger actions in Mcp Gmail. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why fal-cancel needs a policy

Cancelling a request triggers an external operation that stops/aborts an in-progress action. This is an Execute-class action as it causes a side effect on an external system (stopping a running request), though it is not purely destructive (no data deletion) nor financial.

From the tool's definition Cancel a the given request

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

fal-cancel Rate-limited

fal-cancel stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "fal-cancel": {
      "limits": [
        {
          "counter": "fal-cancel_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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 Gmail, so you can run agents against it safely.

FAQ

Questions about fal-cancel

What does the fal-cancel tool do? +

Cancel a the given request. It is categorised as a Execute tool in the Mcp Gmail MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on fal-cancel? +

Register the Mcp Gmail MCP server in PolicyLayer and add a rule for fal-cancel: 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 Gmail. Nothing to install.

What risk level is fal-cancel? +

fal-cancel is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit fal-cancel? +

Yes. Add a rate_limit block to the fal-cancel 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 fal-cancel completely? +

Set action: deny in the PolicyLayer policy for fal-cancel. 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 fal-cancel? +

fal-cancel is provided by the Mcp Gmail MCP server (@monsoft/mcp-gmail). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.