---
# @generated by sylphx-gen 0.1.0 from contracts@e145cc7cf1bc9605f2b27439e5e17ed76a1a2fd7e7021906a013f7565e4a0cd5. Do not edit.
title: "Release control on a lease"
description: "`sandboxes.leases.release_control` (POST /v1/{name}:releaseControl): Releases control held under `epoch`; its controller tokens stop working."
type: reference
product: sandboxes
summary: "Releases control held under `epoch`; its controller tokens stop working."
updated: 2026-09-28
nav: false
---

Releases control held under `epoch`; its controller tokens stop working.

- **Path** `POST https://api.sylphx.com/v1/orgs/acme/projects/shop/envs/production/leases/lease:releaseControl`
- **Scope** `sandboxes:exec`
- **Effect** `write` — a successful call changes state.
- **Collection** [leases](/docs/api/leases)

## Request

| Field | Type | What it is |
| --- | --- | --- |
| `name` | `string` | The name of the lease. Required. |
| `epoch` | `int64` | The epoch AcquireLeaseControl returned. Required. |

## Response

| Field | Type | What it is |
| --- | --- | --- |
| `holder` | `ControlHolder` | Who holds control; UNSPECIFIED when nobody does (agent actions allowed). Output only. One of `agent`, `human`. |
| `epoch` | `int64` | Increases on every acquire; release names it. Output only. |
| `principal` | `string` | The Access principal that acquired control. Output only. |
| `holder_label` | `string` | The caller's label for the person or agent, for example a user id. Output only. |
| `acquire_time` | `timestamp` | When control was acquired. Output only. |
| `expire_time` | `timestamp` | When control lapses unless re-acquired. Output only. |

## Errors

- [`UNAUTHENTICATED`](/docs/api/errors/UNAUTHENTICATED) — No valid key or token was presented.
- [`PERMISSION_DENIED`](/docs/api/errors/PERMISSION_DENIED) — The key lacks the method's permission.
- [`RESOURCE_NOT_FOUND`](/docs/api/errors/RESOURCE_NOT_FOUND) — The named Resource does not exist or is not visible.
- [`STALE_GENERATION`](/docs/api/errors/STALE_GENERATION) — The call named a lease generation or control epoch that is no longer current.

Every error arrives in the body [Errors](/docs/platform/errors) describes.

## Examples

**cURL**

```curl
curl -X POST "https://api.sylphx.com/v1/orgs/acme/projects/shop/envs/production/leases/lease:releaseControl" \
  -H "Authorization: Bearer $SYLPHX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"epoch":1}'
```

**TypeScript**

```ts
const response = await sylphx.sandboxes.leases.releaseControl({ epoch: 1, name: 'orgs/acme/projects/shop/envs/production/leases/lease' })
```

**Rust**

```rust
let mut req = sylphx::sandboxes::ReleaseLeaseControlRequest::default();
req.epoch = 1;
req.name = "orgs/acme/projects/shop/envs/production/leases/lease".to_string();
let response = sx.sandboxes().leases().release_control(req).await?;
```

**CLI**

```bash
sylphx sandboxes leases release-control orgs/acme/projects/shop/envs/production/leases/lease
```

**MCP**

```json
{ "method_id": "sandboxes.leases.release_control", "args": {"epoch":1,"name":"orgs/acme/projects/shop/envs/production/leases/lease"} }
```