---
# @generated by sylphx-gen 0.1.0 from contracts@e145cc7cf1bc9605f2b27439e5e17ed76a1a2fd7e7021906a013f7565e4a0cd5. Do not edit.
title: "Ack a queue"
description: "`events.queues.ack` (POST /v1/{name}:ack): Acknowledges leased messages; each is removed."
type: reference
product: queues
summary: "Acknowledges leased messages; each is removed."
updated: 2026-09-28
nav: false
---

> **This method is not served on the public API.** `api.sylphx.com` does not route this call: its backend is not deployed behind the public API, or does not implement the call. This page documents the contract. It is kept out of the sidebar and of search engines.

Acknowledges leased messages; each is removed. A lease that is stale (expired or superseded) is reported, not applied.

- **Path** `POST https://api.sylphx.com/v1/orgs/acme/projects/shop/envs/production/queues/queue:ack`
- **Scope** `events:write`
- **Effect** `write` — a successful call changes state.
- **Collection** [queues](/docs/api/queues)

## Request

| Field | Type | What it is |
| --- | --- | --- |
| `name` | `string` | The name of the queue. Required. |
| `leases` | `MessageLease[]` | The leases to ack, at most 100. Required. |

### MessageLease

| Field | Type | What it is |
| --- | --- | --- |
| `message_id` | `string` | The message id. Required. |
| `lease_generation` | `int64` | The lease fence: the lease generation this holder was granted. Required. |

## Response

| Field | Type | What it is |
| --- | --- | --- |
| `stale_leases` | `MessageLease[]` | Leases that were stale and not applied. |

### MessageLease

| Field | Type | What it is |
| --- | --- | --- |
| `message_id` | `string` | The message id. Required. |
| `lease_generation` | `int64` | The lease fence: the lease generation this holder was granted. Required. |

## 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.
- [`INVALID_FIELD`](/docs/api/errors/INVALID_FIELD) — A field failed validation.

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/queues/queue:ack" \
  -H "Authorization: Bearer $SYLPHX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"leases":[{"lease_generation":1,"message_id":"…"}]}'
```

**TypeScript**

```ts
const response = await sylphx.events.queues.ack({ leases: [{ leaseGeneration: 1, messageId: '…' }], name: 'orgs/acme/projects/shop/envs/production/queues/queue' })
```

**Rust**

```rust
let mut req = sylphx::events::AckQueueMessagesRequest::default();
req.leases = vec![Default::default()];
req.name = "orgs/acme/projects/shop/envs/production/queues/queue".to_string();
let response = sx.events().queues().ack(req).await?;
```

**CLI**

```bash
sylphx events queues ack orgs/acme/projects/shop/envs/production/queues/queue
```

**MCP**

```json
{ "method_id": "events.queues.ack", "args": {"leases":[{"lease_generation":1,"message_id":"…"}],"name":"orgs/acme/projects/shop/envs/production/queues/queue"} }
```