manage_webhooks · Kit MCP: Risk & Policy

WHAT IT DOES

What manage_webhooks does on Kit

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

WHY IT NEEDS A POLICY

Why manage_webhooks needs a policy

While 'delete' appears in the action list, webhook deletion is reversible—a webhook subscription can be recreated. The tool primarily enables creating and modifying webhook subscriptions (Write category). However, improper webhook configuration could redirect Kit events to attacker-controlled endpoints, potentially capturing sensitive email marketing data.

From the tool's definition Tool description explicitly states actions include 'create' and 'delete' webhooks. The 'create' action modifies Kit's webhook configuration by adding new subscriptions.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

manage_webhooks Rate-limited

manage_webhooks 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": {
    "manage_webhooks": {
      "limits": [
        {
          "counter": "manage_webhooks_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 Kit, so you can run agents against it safely.

FAQ

Questions about manage_webhooks

What does the manage_webhooks tool do? +

Manage Kit webhooks — list registered webhooks, create new webhook subscriptions for Kit events, or delete webhooks. Actions: list, create, delete. It is categorised as a Write tool in the Kit MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on manage_webhooks? +

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

What risk level is manage_webhooks? +

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

Can I rate-limit manage_webhooks? +

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

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

manage_webhooks is provided by the Kit MCP server (@dancumberland/kit-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.