---
title: "Changes to Create Batch"
method: POST
path: "/v1/messages/batches"
---

# Changes to Create Batch

`POST /v1/messages/batches`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 2 of 36 revisions.

- **2025-10-03** `f0554a0bf8b2`: 3 info
- **2025-09-18** `3a2d48137c08`: 2 info

## Changes

- **2025-10-03** `f0554a0bf8b2`: 3 info
  - added the new optional request property `requests/items/messages/items/anyOf[subschema #1: MessageCreate]/content/anyOf[subschema #1]/items/oneOf[subschema #1: TextContent]/signature`
  - added the new optional request property `requests/items/messages/items/anyOf[subschema #1: MessageCreate]/content/anyOf[subschema #1]/items/oneOf[subschema #3: ToolCallContent]/signature`
  - added the new optional request property `requests/items/messages/items/anyOf[subschema #1: MessageCreate]/content/anyOf[subschema #1]/items/oneOf[subschema #7: OmittedReasoningContent]/signature`
- **2025-09-18** `3a2d48137c08`: 2 info
  - added the optional property `agent_id` to the response with the `200` status
  - added the optional property `background` to the response with the `200` status

---

[Operation](https://skmtc.dev/yu-code666/apis/letta-api/docs/v1/messages/batches/post.md) - [API](https://skmtc.dev/yu-code666/apis/letta-api.md) - [Page](https://skmtc.dev/yu-code666/apis/letta-api/changes/v1/messages/batches/post)