> ## Documentation Index
> Fetch the complete documentation index at: https://docs.prefect.io/llms.txt
> Use this file to discover all available pages before exploring further.
# block
# `prefect.cli.block`
Block command — native cyclopts implementation.
Manage blocks and block types.
## Functions
### `register`
```python theme={null}
register()
```
Register blocks types within a module or file.
This makes the blocks available for configuration via the UI.
If a block type has already been registered, its registration will be updated to
match the block's current definition.
### `block_ls`
```python theme={null}
block_ls()
```
View all configured blocks.
### `block_delete`
```python theme={null}
block_delete(slug: Annotated[Optional[str], cyclopts.Parameter(help="A block slug. Formatted as '/'")] = None)
```
Delete a configured block.
### `block_create`
```python theme={null}
block_create(block_type_slug: Annotated[str, cyclopts.Parameter(help='A block type slug. View available types with: prefect block type ls', show_default=False)])
```
Generate a link to the Prefect UI to create a block.
### `block_inspect`
```python theme={null}
block_inspect(slug: Annotated[Optional[str], cyclopts.Parameter(help='A Block slug: /')] = None)
```
Displays details about a configured block.
### `list_types`
```python theme={null}
list_types()
```
List all block types.
### `blocktype_inspect`
```python theme={null}
blocktype_inspect(slug: Annotated[str, cyclopts.Parameter(help='A block type slug')])
```
Display details about a block type.
### `blocktype_delete`
```python theme={null}
blocktype_delete(slug: Annotated[str, cyclopts.Parameter(help='A Block type slug')])
```
Delete an unprotected Block Type.