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letta-server/fern/python-reference/Block.mdx
Kian Jones b8e9a80d93 merge this (#4759)
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2025-09-17 15:47:40 -07:00

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---
slug: python-reference/Block
---
<a id="letta.schemas.block.Block"></a>
## Block
```python
class Block(BaseBlock)
```
A Block represents a reserved section of the LLM's context window which is editable. `Block` objects contained in the `Memory` object, which is able to edit the Block values.
**Arguments**:
- `name` _str_ - The name of the block.
- `value` _str_ - The value of the block. This is the string that is represented in the context window.
- `limit` _int_ - The character limit of the block.
- `template` _bool_ - Whether the block is a template (e.g. saved human/persona options). Non-template blocks are not stored in the database and are ephemeral, while templated blocks are stored in the database.
- `label` _str_ - The label of the block (e.g. 'human', 'persona'). This defines a category for the block.
- `description` _str_ - Description of the block.
- `metadata` _Dict_ - Metadata of the block.
- `user_id` _str_ - The unique identifier of the user associated with the block.