merge this (#4759)

* wait I forgot to comit locally

* cp the entire core directory and then rm the .git subdir

fern/python-reference/LettaUsageStatistics.mdx

@@ -0,0 +1,20 @@
+---
+slug: python-reference/LettaUsageStatistics
+---
+
+<a id="letta.schemas.usage.LettaUsageStatistics"></a>
+
+## LettaUsageStatistics
+
+```python
+class LettaUsageStatistics(BaseModel)
+```
+
+Usage statistics for the agent interaction.
+
+**Attributes**:
+
+- `completion_tokens` _int_ - The number of tokens generated by the agent.
+- `prompt_tokens` _int_ - The number of tokens in the prompt.
+- `total_tokens` _int_ - The total number of tokens processed by the agent.
+- `step_count` _int_ - The number of steps taken by the agent.