Back to home

AI Agent Callback URL Explained

A callback URL lets an AI agent wait for a long-running task and resume when the external system posts the result.

Last updated: 2026-06-24

An AI agent callback URL is a public endpoint created for one job or session. External systems send the final result there, and the agent uses that callback to continue the workflow without polling constantly.

Typical flow

  1. Agent creates a callback URL.
  2. Agent passes the URL to a third-party job.
  3. The job finishes later and posts a result.
  4. The agent wakes up, inspects the payload, and continues.

Example payload

{
  "jobId": "vid_123",
  "status": "completed",
  "outputUrl": "https://cdn.example.com/output.mp4"
}

Common mistakes

  • Reusing the same callback URL across unrelated jobs
  • Polling even though the provider already supports callbacks
  • Not validating the callback payload before resuming the agent

FAQ

Why not just poll?

Polling is noisy, slower, and often more expensive for long-running jobs.

What should the callback include?

At minimum: a job identifier, final status, and enough data for the next step.

Use WebhookPilot callback sessions when you need a wait-and-resume workflow.