Koskamo

Verify Webhook Callbacks for AI Agents

Ensures webhook integrity by verifying raw body, HMAC-SHA256 signatures, timestamp windows, and atomic delivery deduplication.

How it works

Read-onlySoftware development

The agent implements verification logic for AI agent webhook callbacks. It checks the raw body against an HMAC-SHA256 signature, validates the timestamp window to prevent replay attacks, uses constant-time comparison for security, and ensures atomic delivery deduplication to handle duplicate notifications safely.

Prompt

Paste this into an agent that has the servers below connected. Adjust the names and dates to your own.

Prompt for Verify Webhook Callbacks for AI Agents
Implement verification for AI agent webhook callbacks. Check the raw body with HMAC-SHA256, validate the timestamp window, use constant-time comparison, and ensure atomic delivery deduplication.

MCP servers it needs

Source

The vendor page this playbook is drawn from, and the passage that supports it.

Verify AI-agent webhook callbacks with the raw body, HMAC-SHA256, a timestamp window, constant-time comparison, and atomic delivery deduplication.
Field notes — ActionDock

Each playbook is drawn from the vendor page it cites and reviewed by Koskamo before it is published. Koskamo does not run these servers or your agent: check what each tool will do before you let it act on your accounts.