---
# @generated by sylphx-gen 0.1.0 from contracts@e145cc7cf1bc9605f2b27439e5e17ed76a1a2fd7e7021906a013f7565e4a0cd5. Do not edit.
title: "STALE_GENERATION"
description: "STALE_GENERATION (ABORTED, HTTP 409): The call named a lease generation or control epoch that is no longer current."
type: reference
product: platform
summary: "The call named a lease generation or control epoch that is no longer current."
updated: 2026-09-28
nav: false
---

The call named a lease generation or control epoch that is no longer current.

**HTTP** 409 · **gRPC** `ABORTED` · [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. Long-running or interactive processes use the guest protocol at `status.endpoints.guest_uri`. |
| [`sandboxes.leases.act`](/docs/api/leases/act) | `sandboxes:exec` | Performs computer actions on a DESKTOP, BROWSER, or ANDROID lease, in order, and returns each action's result and, when `screenshot` is set, the screenshot taken after the last action. The actions are the Anthropic computer tool's and OpenAI computer use's, one-to-one. Refused CONTROL_HELD_BY_HUMAN while a human holds control. |
| [`sandboxes.leases.release_control`](/docs/api/leases/release_control) | `sandboxes:exec` | Releases control held under `epoch`; its controller tokens stop working. |