# Create parts

URL: https://docs.hanzo.ai/docs/openapi/s3/post-s3-buckets-by-bucket-uploads-by-upload-parts

> Answers presigned PUT URLs for some parts of a multipart upload, at most 64 a call, each valid for minutes: mint them as the upload reaches them.

`POST /v1/s3/buckets/{bucket}/uploads/{upload}/parts`

> [S3 →](https://docs.hanzo.ai/docs/openapi/s3) · [All API references →](https://docs.hanzo.ai/docs/openapi) · [Get started →](https://docs.hanzo.ai/docs/guides)

|               |                                                                      |
| ------------- | -------------------------------------------------------------------- |
| **Address**   | `https://api.hanzo.ai/v1/s3/buckets/{bucket}/uploads/{upload}/parts` |
| **Method**    | `POST`                                                               |
| **Operation** | `post_s3_buckets_by_bucket_uploads_by_upload_parts`                  |
| **Auth**      | `Authorization: Bearer $HANZO_API_KEY`                               |

Answers presigned PUT URLs for some parts of a multipart upload, at
most 64 a call, each valid for minutes: mint them as the upload reaches them.
PUT a part's bytes to its URL as they are — no headers are signed — and the
store answers the part's ETag, which completing does not need.

## Request

6 fields, body `application/json` (required).

| Field    | In   | Type               | Required | Description                                          |
| -------- | ---- | ------------------ | -------- | ---------------------------------------------------- |
| `bucket` | path | string             | yes      | Bucket is the bucket, from the path.                 |
| `upload` | path | string             | yes      | Upload is the upload's id, from the path.            |
| `bucket` | body | string             | —        | Bucket is the bucket, from the path.                 |
| `key`    | body | string             | —        | Key is the object key the upload was started on.     |
| `parts`  | body | integer (int64)\[] | —        | Parts are the part numbers to mint URLs for, from 1. |
| `upload` | body | string             | —        | Upload is the upload's id, from the path.            |

## Response

| Status    | Body            | Meaning |
| --------- | --------------- | ------- |
| `200`     | s3.partURLs     | ok      |
| `default` | problem-details | refused |

`200` body — 4 fields.

| Field         | In   | Type            | Always | Description                                                        |
| ------------- | ---- | --------------- | ------ | ------------------------------------------------------------------ |
| `expiresIn`   | body | integer (int64) | —      | Expiry is how many seconds the URLs stay valid.                    |
| `urls`        | body | s3.partURL\[]   | —      | URLs are one presigned PUT per part asked for.                     |
| `urls[].part` | body | integer (int64) | —      | Part is the part number.                                           |
| `urls[].url`  | body | string          | —      | URL is the presigned address to PUT the part's bytes to, directly. |

Failure carries the platform error shape — see [Errors](https://docs.hanzo.ai/docs/errors).

## Examples

**CLI**

`hanzo` has no subcommand for this operation — the CLI serves only what cloud's live route table confirms. Use HTTP or an SDK.

**SDK**

**.ts**

```ts
import { Configuration, S3Api } from 'hanzoai';

const api = new S3Api(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.postS3BucketsByBucketUploadsByUploadParts({ bucket: 'bucket', upload: 'upload', bucket: "<bucket>", key: "<key>" });
```

**.py**

```python
from hanzoai.cloud import ApiClient, Configuration
from hanzoai.cloud.api import S3Api

client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"]))
result = S3Api(client).post_s3_buckets_by_bucket_uploads_by_upload_parts(bucket='bucket', upload='upload', bucket="<bucket>", key="<key>")
```

**.go**

```go
cfg := hanzoai.NewConfiguration()
cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY"))
client := hanzoai.NewAPIClient(cfg)

resp, _, err := client.S3API.PostS3BucketsByBucketUploadsByUploadParts(context.Background()).Execute()
if err != nil {
	return err
}
```

**.rs**

```rust
use hanzo_client::apis::{configuration::Configuration, s3_api};

let mut cfg = Configuration::new();
cfg.bearer_access_token = std::env::var("HANZO_API_KEY").ok();

let result = s3_api::post_s3_buckets_by_bucket_uploads_by_upload_parts(&cfg, Default::default()).await?;
```

**.java**

```java
import ai.hanzo.cloud.ApiClient;
import ai.hanzo.cloud.api.S3Api;

ApiClient client = new ApiClient();
client.setBearerToken(System.getenv("HANZO_API_KEY"));

var result = new S3Api(client).postS3BucketsByBucketUploadsByUploadParts();
```

**HTTP**

```bash
curl -X POST https://api.hanzo.ai/v1/s3/buckets/<bucket>/uploads/<upload>/parts \
  -H "Authorization: Bearer $HANZO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "bucket": "<bucket>",
       "key": "<key>"
     }'
```

**MCP**

MCP reaches **s3** through the `s3` tool, which names its 6 operations with its own verbs — this one among them, under a name only MCP declares. `describe` explains any of them:

```bash
curl -X POST https://api.hanzo.ai/v1/mcp \
  -H "Content-Type: application/json" \
  -d '{
       "jsonrpc": "2.0",
       "id": 1,
       "method": "tools/call",
       "params": {
         "name": "describe",
         "arguments": {
           "op": "list_s3_buckets"
         }
       }
     }'
```

---

[S3 API](https://docs.hanzo.ai/docs/openapi/s3) · [All Hanzo APIs](https://docs.hanzo.ai/docs/openapi) · [Interactive reference](https://docs.hanzo.ai/docs/openapi/reference)