Delete a webhook subscription. DESTRUCTIVE: list the webhook first, show the user its URL/events/workspace, and get explicit confirmation before calling.
AI agents call delete_webhook to permanently remove resources in Posterly — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently deletes webhook subscriptions, which cannot be undone. Deletion of webhooks is an irreversible action that removes event delivery configurations. The description itself labels this as 'DESTRUCTIVE', confirming it should be categorized as such rather than a mere Write operation.
From the tool's definition Tool name is 'delete_webhook' and description explicitly states 'Delete a webhook subscription' and 'DESTRUCTIVE'. The description confirms irreversible deletion of a webhook configuration.
Attacks that exploit this kind of access
Delete a webhook subscription. DESTRUCTIVE: list the webhook first, show the user its URL/events/workspace, and get explicit confirmation before calling. It is categorised as a Destructive tool in the Posterly MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Posterly MCP server in PolicyLayer and add a rule for delete_webhook: 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 Posterly. Nothing to install.
delete_webhook is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the delete_webhook 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.
Set action: deny in the PolicyLayer policy for delete_webhook. 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.
delete_webhook is provided by the Posterly MCP server (posterly-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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