> ## Documentation Index
> Fetch the complete documentation index at: https://docs.uniac.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# The manifest

> The uniac.json schema.

Every Uniac package has a `uniac.json` at its root. The CLI reads it on `build`, `install`, `link`, `dev`, and `deploy`.

## Required fields

| Field        | Type   | Purpose                                                                                 |
| ------------ | ------ | --------------------------------------------------------------------------------------- |
| `name`       | string | Package name. Defaults to the directory basename if omitted.                            |
| `kind`       | string | `"lib"` or `"app"`. See [Services and Systems](/concepts/services).                     |
| `language`   | string | Runtime language. Today: `"python"` only.                                               |
| `entrypoint` | string | `"module:ClassName"` — the `Service` or `System` class the build-time introspect walks. |

## Optional fields

| Field                  | Type      | Purpose                                                                                                            |
| ---------------------- | --------- | ------------------------------------------------------------------------------------------------------------------ |
| `dependencies`         | string\[] | Peer Service names resolved from the local store on `uniac install`.                                               |
| `build.command`        | string\[] | Container CMD as a JSON exec-form array. Auto-derived from `language` + `entrypoint` if omitted.                   |
| `build.baseImage`      | string    | Override the default base image (`python:3.11-slim` for Python).                                                   |
| `build.systemPackages` | string\[] | `apt-get` packages installed during build.                                                                         |
| `init`                 | object    | Map of `__init__` arg names to default values. Forwarded as `UNIAC_INIT_<UPPERCASE_NAME>` env vars at deploy time. |

## Example

```json uniac.json theme={null}
{
  "name": "greeter",
  "kind": "app",
  "language": "python",
  "entrypoint": "app:Greeter",
  "dependencies": ["logger", "feature-flags"],
  "build": {
    "command": ["uvicorn", "app:api", "--host", "0.0.0.0", "--port", "8080"],
    "baseImage": "python:3.12-slim"
  },
  "init": {
    "greeting": "hello",
    "log_level": "info"
  }
}
```

`init` values are loaded into your `__init__` keyword args by [`load()`](/sdk/load).