# Create library URL: https://docs.hanzo.ai/docs/openapi/library/post-library > Keeps one thing you made in your Library: its bytes go to your own prefix of the Library's store, and it is listed to you alone until you share it. `POST /v1/library` > [Library →](https://docs.hanzo.ai/docs/openapi/library) · [All API references →](https://docs.hanzo.ai/docs/openapi) · [Get started →](https://docs.hanzo.ai/docs/guides) | | | | ------------- | -------------------------------------- | | **Address** | `https://api.hanzo.ai/v1/library` | | **Method** | `POST` | | **Operation** | `post_library` | | **Auth** | `Authorization: Bearer $HANZO_API_KEY` | Keeps one thing you made in your Library: its bytes go to your own prefix of the Library's store, and it is listed to you alone until you share it. Send `data` up to 10 MiB inline, or send `bytes` up to 2 GiB to reserve a signed `upload` PUT and finish it with `PATCH /v1/library/:id` `{"commit": true}`. A save with the `key` of one already kept answers that item. ## Request 15 fields, body `application/json` (required). | Field | In | Type | Required | Description | | --------- | ---- | --------------- | -------- | ------------------------------------------------------------------------------------------------------------- | | `bytes` | body | integer (int64) | — | Bytes reserves an upload of this size, at most 2 GiB, when data is empty, and returns a signed PUT in upload. | | `data` | body | string | — | Data is the bytes, base64, at most 10 MiB; omit when reserving with bytes. | | `height` | body | integer (int64) | — | | | `key` | body | string | — | Key makes the save idempotent: the same source and key answer the item already kept. | | `kind` | body | string | — | Kind is image, video, audio, document, slides, type, model, code or file; absent derives it from mime. | | `mime` | body | string | — | Mime is its media type. | | `name` | body | string | — | Name is what it is called, a file name. | | `origin` | body | string | — | Origin is the path on this site back to what made it, as /chat?thread=…. | | `pages` | body | integer (int64) | — | | | `preview` | body | string | — | Preview is a still that shows it, base64, at most 2 MiB. | | `project` | body | string | — | Project is one of the organization's projects, by slug. | | `ref` | body | string | — | Ref is what made it: the conversation, the run. | | `seconds` | body | number (double) | — | | | `source` | body | string | — | Source is the product it came from: chat, dev, studio or workflow. | | `width` | body | integer (int64) | — | Width, Height, Seconds and Pages describe it when known. | ## Response | Status | Body | Meaning | | --------- | ------------------- | ------- | | `201` | library.LibraryItem | created | | `default` | problem-details | refused | `201` body — 29 fields. | Field | In | Type | Always | Description | | ------------------------ | ---- | --------------------- | ------ | ------------------------------------------------------------------------------------------------------------------------- | | `by` | body | string | — | By is the owner as a reader names them: the name, else the address, the identity boundary carried when the item was made. | | `bytes` | body | integer (int64) | — | | | `created` | body | string | — | | | `download` | body | string | — | | | `expires` | body | string | — | | | `height` | body | integer (int64) | — | | | `id` | body | string | — | | | `kind` | body | string | — | | | `mime` | body | string | — | | | `mine` | body | boolean | — | | | `name` | body | string | — | | | `origin` | body | string | — | | | `owner` | body | string | — | | | `pages` | body | integer (int64) | — | | | `preview` | body | string | — | | | `project` | body | string | — | | | `ref` | body | string | — | | | `seconds` | body | number (double) | — | | | `shared` | body | boolean | — | | | `source` | body | string | — | | | `updated` | body | string | — | | | `upload` | body | library.LibraryUpload | — | | | `upload.expires` | body | string | — | | | `upload.headers` | body | library.Field\[] | — | Headers are the ones the PUT must carry. | | `upload.headers[].name` | body | string | — | Name is the field's name. | | `upload.headers[].value` | body | string | — | Value is the field's value, verbatim. | | `upload.url` | body | string | — | | | `url` | body | string | — | | | `width` | body | integer (int64) | — | | Failure carries the platform error shape — see [Errors](https://docs.hanzo.ai/docs/errors). ## Examples **CLI** ```bash hanzo library create ``` **SDK** **.ts** ```ts import { Configuration, LibraryApi } from 'hanzoai'; const api = new LibraryApi(new Configuration({ accessToken: process.env.HANZO_API_KEY })); const { data } = await api.postLibrary({ bytes: 0, data: "" }); ``` **.py** ```python from hanzoai.cloud import ApiClient, Configuration from hanzoai.cloud.api import LibraryApi client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"])) result = LibraryApi(client).post_library(bytes=0, data="") ``` **.go** ```go cfg := hanzoai.NewConfiguration() cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY")) client := hanzoai.NewAPIClient(cfg) resp, _, err := client.LibraryAPI.PostLibrary(context.Background()).Execute() if err != nil { return err } ``` **.rs** ```rust use hanzo_client::apis::{configuration::Configuration, library_api}; let mut cfg = Configuration::new(); cfg.bearer_access_token = std::env::var("HANZO_API_KEY").ok(); let result = library_api::post_library(&cfg, Default::default()).await?; ``` **.java** ```java import ai.hanzo.cloud.ApiClient; import ai.hanzo.cloud.api.LibraryApi; ApiClient client = new ApiClient(); client.setBearerToken(System.getenv("HANZO_API_KEY")); var result = new LibraryApi(client).postLibrary(); ``` **HTTP** ```bash curl -X POST https://api.hanzo.ai/v1/library \ -H "Authorization: Bearer $HANZO_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "bytes": 0, "data": "" }' ``` **MCP** MCP reaches **library** through the `library` 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_libraries" } } }' ``` --- [Library API](https://docs.hanzo.ai/docs/openapi/library) · [All Hanzo APIs](https://docs.hanzo.ai/docs/openapi) · [Interactive reference](https://docs.hanzo.ai/docs/openapi/reference)