Create uploads

Begins a multipart upload of a large file into one of the caller's org buckets.

POST /v1/s3/buckets/{bucket}/uploads

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Address	`https://api.hanzo.ai/v1/s3/buckets/{bucket}/uploads`
Method	`POST`
Operation	`post_s3_buckets_by_bucket_uploads`
Auth	`Authorization: Bearer $HANZO_API_KEY`

Begins a multipart upload of a large file into one of the caller's org buckets. Then mint presigned URLs for its parts with POST .../uploads/{upload}/parts, PUT each part's bytes to its URL — every part but the last exactly partSize bytes — and assemble the object with POST .../uploads/{upload}/complete. A dropped connection loses nothing: GET .../uploads/{upload} lists the parts already stored, so only the rest are sent again. Use this for anything over a few megabytes; a small file takes the single presigned PUT of POST /v1/s3/buckets/{bucket}/objects.

Request

4 fields, body application/json (required).

Field	In	Type	Required	Description
`bucket`	path	string	yes	Bucket is the bucket to upload into, from the path.
`bucket`	body	string	—	Bucket is the bucket to upload into, from the path.
`key`	body	string	—	Key is the object key the upload will become, relative to the bucket root.
`type`	body	string	—	Type is the object's media type, kept with it once it is assembled.

Response

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

200 body — 3 fields.

Field	In	Type	Always	Description
`key`	body	string	—	Key is the object key the upload is bound to.
`partSize`	body	integer (int64)	—	PartSize is the size every part but the last must be, in bytes.
`upload`	body	string	—	Upload is the upload's id, which every later call names.

Failure carries the platform error shape — see Errors.

Examples

CLI

SDK

HTTP

MCP

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

.ts

.py

.go

.rs

.java

import { Configuration, S3Api } from 'hanzoai';

const api = new S3Api(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.postS3BucketsByBucketUploads({ bucket: 'bucket', bucket: "<bucket>", key: "<key>" });

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(bucket='bucket', bucket="<bucket>", key="<key>")

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

resp, _, err := client.S3API.PostS3BucketsByBucketUploads(context.Background()).Execute()
if err != nil {
	return err
}

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(&cfg, Default::default()).await?;

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).postS3BucketsByBucketUploads();

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

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:

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"
         }
       }
     }'

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