---
# @generated by sylphx-gen. Do not edit.
title: "EXEC_OUTCOME_UNKNOWN"
description: "EXEC_OUTCOME_UNKNOWN (FAILED_PRECONDITION, HTTP 409): A keyed command was dispatched to the guest but its outcome was lost (the dispatcher, the stream, or the lease ended before the result was recorded)."
type: reference
product: platform
summary: "A keyed command was dispatched to the guest but its outcome was lost (the dispatcher, the stream, or the lease ended before the result was…"
updated: 2026-09-28
nav: false
---

A keyed command was dispatched to the guest but its outcome was lost (the dispatcher, the stream, or the lease ended before the result was recorded). The key never runs again; the command may or may not have taken effect. Not retryable with the same key.

**HTTP** 409 · **gRPC** `FAILED_PRECONDITION` · [the error body](/docs/platform/errors)

## Returned by

| Method | Scope | What it does |
| --- | --- | --- |
| [`sandboxes.leases.exec`](/docs/api/leases/exec) | `sandboxes:exec` | Runs one command in the lease to completion and returns its output, capped at 1 MiB per stream. With `idempotency_key` the command is dispatched at most once per lease and key, and its recorded result is returned again, also after the lease ended. Long-running or interactive processes use the guest protocol at `status.endpoints.guest_uri`. |