> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-7021d5f4.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# ReasoningSummaryPartAddedEvent - Python SDK

> ReasoningSummaryPartAddedEvent method reference

<Warning>
  The Python SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/python-sdk/issues).
</Warning>

Event emitted when a reasoning summary part is added

## Fields

| Field             | Type                                                                                                                             | Required             | Description | Example                                                                          |
| ----------------- | -------------------------------------------------------------------------------------------------------------------------------- | -------------------- | ----------- | -------------------------------------------------------------------------------- |
| `item_id`         | *str*                                                                                                                            | :heavy\_check\_mark: | N/A         |                                                                                  |
| `output_index`    | *int*                                                                                                                            | :heavy\_check\_mark: | N/A         |                                                                                  |
| `part`            | [components.ReasoningSummaryText](/client-sdks/python/api-reference/components/reasoningsummarytext)                             | :heavy\_check\_mark: | N/A         | `{"text": "Analyzed the problem using first principles","type": "summary_text"}` |
| `sequence_number` | *int*                                                                                                                            | :heavy\_check\_mark: | N/A         |                                                                                  |
| `summary_index`   | *int*                                                                                                                            | :heavy\_check\_mark: | N/A         |                                                                                  |
| `type`            | [components.ReasoningSummaryPartAddedEventType](/client-sdks/python/api-reference/components/reasoningsummarypartaddedeventtype) | :heavy\_check\_mark: | N/A         |                                                                                  |