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Durable Agent Task Validator
x402
Durable Agent Task Validator is a paid API for AI agents from phion.systems, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-23).
Validates agent task envelopes for durability, isolation, and replay-safety before execution
Price / call$0.004
Success—
StatusUnknown
How this service works
Validate durable, isolated and replay-safe agent task envelopes
Output
Returns a validation report indicating whether the agent task envelope satisfies durability, isolation, and replay-safety requirements. Includes pass/fail status for each property and any detected issues such as missing idempotency keys, unsafe side-effect declarations, or broken isolation boundaries.
Example use cases
Pre-execution replay safety check
“I'm about to enqueue this agent task that involves a payment action — can you validate that the task envelope is replay-safe and durable so it won't accidentally execute twice if something fails and retries?”
Isolated task screening for multi-agent pipeline
“Before my orchestrator sends this task to a sub-agent, validate that the task envelope is properly isolated and won't leak state or side effects into other concurrent tasks.”
Durable queue submission gate
“I'm running a long-running agent workflow and need to make sure each task envelope passes a durability and replay-safety check before it enters the queue — can you validate this one?”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/durable-agent-task?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a dedicated, policy-enforced check on agent task envelopes specifically for replay-safety, isolation, and durability properties — particularly before submitting tasks to durable queues, retrying failed tasks, or passing tasks between agent boundaries where double-execution or state leakage would be harmful. Prefer this over generic validation when the concern is specifically agentic execution safety rather than schema conformance alone.
Side effects
- Malformed or empty task envelope returns validation error
- Missing required envelope fields causes rejection with field-level diagnostics
- Task envelope with non-idempotent side effects flagged as replay-unsafe
- Ambiguous isolation boundaries result in partial validation failure
- Schema mismatch with expected envelope format returns parse error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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