test_webhook_subscription · Smokeball MCP: Risk & Policy

WHAT IT DOES

What test_webhook_subscription does on Smokeball

AI agents invoke test_webhook_subscription to trigger actions in Smokeball. 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 test_webhook_subscription needs a policy

This tool triggers an external HTTP request to a webhook endpoint, which is an active operation with external side effects. It doesn't read, write, or delete data — it executes an outbound call to a third-party system. Misuse could spam external endpoints or reveal webhook URLs, hence medium severity.

From the tool's definition Send a test notification to a webhook subscription endpoint

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

test_webhook_subscription Rate-limited

test_webhook_subscription 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": {
    "test_webhook_subscription": {
      "limits": [
        {
          "counter": "test_webhook_subscription_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 Smokeball, so you can run agents against it safely.

FAQ

Questions about test_webhook_subscription

What does the test_webhook_subscription tool do? +

Send a test notification to a webhook subscription endpoint. It is categorised as a Execute tool in the Smokeball MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on test_webhook_subscription? +

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

What risk level is test_webhook_subscription? +

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

Can I rate-limit test_webhook_subscription? +

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

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

test_webhook_subscription is provided by the Smokeball MCP server (rosenadvertising/smokeball-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.