pypa-hatch/docs/plugins/metadata-hook/custom.md

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# Custom metadata hook
-----
This is a custom class in a given Python file that inherits from the [MetadataHookInterface](reference.md#hatchling.metadata.plugin.interface.MetadataHookInterface).
## Configuration
The metadata hook plugin name is `custom`.
```toml config-example
[tool.hatch.metadata.hooks.custom]
```
## Options
| Option | Default | Description |
| --- | --- | --- |
| `path` | `hatch_build.py` | The path of the Python file |
## Example
```python tab="hatch_build.py"
from hatchling.metadata.plugin.interface import MetadataHookInterface
class CustomMetadataHook(MetadataHookInterface):
...
```
If multiple subclasses are found, you must define a function named `get_metadata_hook` that returns the desired build hook.
!!! note
Any defined [PLUGIN_NAME](reference.md#hatchling.metadata.plugin.interface.MetadataHookInterface.PLUGIN_NAME) is ignored and will always be `custom`.