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WithZero Scheduler — Synchronous Task Run
WithZero Scheduler — Synchronous Task Run is a paid API for AI agents from agents.withzero.xyz, paid per call via MPP, price unknown, status unknown (last checked 2026-09-12).
Immediately claims and executes a scheduled task inline, blocking until the run completes, then returns the finalized run record.
Price / call—
Success—
StatusUnknown
How this service works
Run a task right now, synchronously: claims, runs the sandbox inline, and blocks until the run finalizes, then returns it. Billed like a normal cron run. Use it to trigger an on-demand run or to test a cron you just set up before trusting the schedule. Does NOT advance next_run_at. 📖 Full guide: https://scheduler.withzero.xyz/llms.txt
Output
Returns a run record containing: run_id (UUID), task_id (UUID), status string indicating the final run outcome, trigger string indicating how the run was initiated, and claimed_at timestamp showing when the sandbox claimed the task. The response is only returned after the run fully finalizes (blocking).
Example use cases
Test a newly created cron job
“I just set up a cron task with ID b7e2d1a0-1234-4abc-9def-abcdef012345 — can you run it synchronously right now so I can verify it executes correctly before the schedule kicks in?”
On-demand report generation
“Trigger task c9a3b2f1-5678-4bcd-aef0-fedcba987654 immediately and block until it's done — I need the run result before I send the report out.”
Debug a failing scheduled task
“My scheduled task e1d4c3b2-9abc-4def-0123-456789abcdef hasn't been working — run it right now synchronously and give me the finalized run status so I can see what happened.”
Technical details
Endpoint
POSThttps://agents.withzero.xyz/api/v1/scheduler/tasks/{id}/runsWhen to prefer
Use this endpoint when you need to run a task immediately and must wait for the result before proceeding — ideal for testing a newly created cron task, debugging a task interactively, or triggering an on-demand execution where the outcome is needed synchronously. Prefer the async trigger endpoint if you don't need to block and just want to fire-and-forget. This endpoint does NOT advance next_run_at, so it won't disrupt your scheduled cadence.
Side effects
- Task ID not found or caller lacks ownership proof — returns 404 or 403
- Task is already running or locked — may return conflict error
- Sandbox execution timeout — run may finalize with a failed/timeout status
- Invalid UUID format in path parameter — returns 400
- Insufficient escrow/payment balance — returns 402
Input
Schema · Request body
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {},
"description": "Empty body. Runs the task immediately and synchronously — blocks until the run finalizes, then returns it.",
"additionalProperties": false
}Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| run_idrequired | string | |
| statusrequired | string | |
| task_idrequired | string | |
| triggerrequired | string | |
| claimed_atrequired | string |
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