# Create artifacts — POST /v1/train/artifacts URL: https://docs.hanzo.ai/docs/openapi/train/post-train-artifacts > Records rows the org is about to upload, named by the SHA-256 of their bytes, and answers the same grant an executor's artifact gets: a presigned PUT S3 accepts only with that checksum and length, encrypted under the org's key — a PUT per 64 MiB part over 64 MiB — or stored: true when the org already holds those bytes. `POST /v1/train/artifacts` > [Train →](https://docs.hanzo.ai/docs/openapi/train) · [All API references →](https://docs.hanzo.ai/docs/openapi) · [Get started →](https://docs.hanzo.ai/docs/guides) | | | | ------------- | ----------------------------------------- | | **Address** | `https://api.hanzo.ai/v1/train/artifacts` | | **Method** | `POST` | | **Operation** | `post_train_artifacts` | | **Auth** | `Authorization: Bearer $HANZO_API_KEY` | Records rows the org is about to upload, named by the SHA-256 of their bytes, and answers the same grant an executor's artifact gets: a presigned PUT S3 accepts only with that checksum and length, encrypted under the org's key — a PUT per 64 MiB part over 64 MiB — or stored: true when the org already holds those bytes. A job names them as `dataset.uri` `artifact:`, and its create reads the upload back before it is accepted. Storage is billed by the GB-month while the org keeps them, so an upload is refused 402/503 when the uploader's wallet cannot pay a month of keeping these bytes with what it already keeps in the org and what the org has pending. ## Request 4 fields, body `application/json` (required). | Field | In | Type | Required | Description | | -------- | ---- | --------------- | -------- | -------------------------------------------------------------------------- | | `kind` | body | string | — | Kind is dataset: JSON Lines rows a job reads as `artifact:<sha256>`. | | `name` | body | string | — | Name labels it. | | `sha256` | body | string | — | SHA256 is the hex digest of the bytes. | | `size` | body | integer (int64) | — | Size is the byte count. | ## Response | Status | Body | Meaning | | --------- | ----------------- | ------- | | `200` | train.registerOut | ok | | `default` | problem-details | refused | `200` body — 15 fields. | Field | In | Type | Always | Description | | -------------------------- | ---- | --------------- | ------ | ----------------------------------------------------------------------------- | | `sha256` | body | string | — | SHA256 names the artifact. | | `stored` | body | boolean | — | Stored says the org already holds these bytes: nothing to upload. | | `upload` | body | train.upload | — | | | `upload.expires` | body | integer (int64) | — | Expires is when the grant stops being accepted, unix seconds. | | `upload.headers` | body | object | — | Headers must be sent verbatim with the single PUT; the signature covers them. | | `upload.headers.*` | body | string | — | | | `upload.method` | body | string | — | Method is PUT. | | `upload.parts` | body | train.part\[] | — | Parts are the object's consecutive byte ranges, each PUT to its own address. | | `upload.parts[].headers` | body | object | — | Headers must be sent verbatim; the signature covers them. | | `upload.parts[].headers.*` | body | string | — | | | `upload.parts[].number` | body | integer (int64) | — | Number orders the part from 1. | | `upload.parts[].offset` | body | integer (int64) | — | Offset is the part's first byte in the object. | | `upload.parts[].size` | body | integer (int64) | — | Size is the part's byte count. | | `upload.parts[].url` | body | string | — | URL is the presigned address to PUT the range to. | | `upload.url` | body | string | — | URL is the presigned address of a single PUT; empty when Parts is given. | 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, TrainApi } from 'hanzoai'; const api = new TrainApi(new Configuration({ accessToken: process.env.HANZO_API_KEY })); const { data } = await api.postTrainArtifacts({ kind: "", name: "" }); ``` **.py** ```python from hanzoai.cloud import ApiClient, Configuration from hanzoai.cloud.api import TrainApi client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"])) result = TrainApi(client).post_train_artifacts(kind="", name="") ``` **.go** ```go cfg := hanzoai.NewConfiguration() cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY")) client := hanzoai.NewAPIClient(cfg) resp, _, err := client.TrainAPI.PostTrainArtifacts(context.Background()).Execute() if err != nil { return err } ``` **.rs** ```rust use hanzo_client::apis::{configuration::Configuration, train_api}; let mut cfg = Configuration::new(); cfg.bearer_access_token = std::env::var("HANZO_API_KEY").ok(); let result = train_api::post_train_artifacts(&cfg, Default::default()).await?; ``` **.java** ```java import ai.hanzo.cloud.ApiClient; import ai.hanzo.cloud.api.TrainApi; ApiClient client = new ApiClient(); client.setBearerToken(System.getenv("HANZO_API_KEY")); var result = new TrainApi(client).postTrainArtifacts(); ``` **HTTP** ```bash curl -X POST https://api.hanzo.ai/v1/train/artifacts \ -H "Authorization: Bearer $HANZO_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "kind": "", "name": "" }' ``` **MCP** MCP declares no tool for **train** — `tools/list` on `https://api.hanzo.ai/v1/mcp` names the products it does reach. Use HTTP or an SDK. --- [Train API](https://docs.hanzo.ai/docs/openapi/train) · [All Hanzo APIs](https://docs.hanzo.ai/docs/openapi) · [Interactive reference](https://docs.hanzo.ai/docs/openapi/reference)