---
title: "Changes to POST /create-sms-chat"
method: POST
path: "/create-sms-chat"
---

# Changes to POST /create-sms-chat

`POST /create-sms-chat`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 8 of 28 revisions.

- **2026-05-28** `40402ca870b9` — 1 warning
- **2026-05-12** `6dff2a12f866` — 3 breaking
- **2026-05-08** `7dd16ddf69d8` — 1 warning
- **2026-05-07** `f1a0d7c1e36c` — 1 info
- **2026-04-20** `8ee53928bf31` — 25 breaking, 9 warning, 5 info
- **2026-03-09** `8fbf8c54a142` — 3 breaking
- **2026-02-23** `bcff6899fa2a` — 1 info
- **2026-02-10** `0bf5cea5dfcc` — 1 info

## Changes

- **2026-05-28** `40402ca870b9` — 1 warning
  - changed the pattern of the request property `override_agent_version/oneOf[subschema #2]/` from `^(latest|(?!(?:v\d+)$)[a-z][a-z0-9_-]{0,19})$` to `^(latest|latest_published|(?!(?:latest|latest_published|v\d+)$)[a-z][a-z0-9_-]{0,19})$`
- **2026-05-12** `6dff2a12f866` — 3 breaking
  - the `retell_llm_dynamic_variables/additionalProperties/` request property type changed from no type to `string`
  - the `collected_dynamic_variables/additionalProperties/` response's property type changed from no type to `string` for status `200`
  - the `retell_llm_dynamic_variables/additionalProperties/` response's property type changed from no type to `string` for status `200`
- **2026-05-08** `7dd16ddf69d8` — 1 warning
  - changed the pattern of the request property `override_agent_version/oneOf[subschema #2]/` from `^[a-z0-9_-]+$` to `^(latest|(?!(?:v\d+)$)[a-z][a-z0-9_-]{0,19})$`
- **2026-05-07** `f1a0d7c1e36c` — 1 info
  - request property `override_agent_version` list-of-types was widened by adding types `string` to media type `application/json`
- **2026-04-20** `8ee53928bf31` — 25 breaking, 9 warning, 5 info
  - the `message_with_tool_calls/items/oneOf[#/components/schemas/Message]/` response's property type changed from `object` to no type for status `200`
  - the `message_with_tool_calls/items/oneOf[#/components/schemas/NodeTransitionMessage]/` response's property type changed from `object` to no type for status `200`
  - the `message_with_tool_calls/items/oneOf[#/components/schemas/StateTransitionMessage]/` response's property type changed from `object` to no type for status `200`
  - the `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallInvocationMessage]/` response's property type changed from `object` to no type for status `200`
  - the `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallResultMessage]/` response's property type changed from `object` to no type for status `200`
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/Message]/content` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/Message]/created_timestamp` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/Message]/message_id` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/Message]/role` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/NodeTransitionMessage]/created_timestamp` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/NodeTransitionMessage]/message_id` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/NodeTransitionMessage]/role` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/StateTransitionMessage]/created_timestamp` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/StateTransitionMessage]/message_id` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/StateTransitionMessage]/role` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallInvocationMessage]/arguments` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallInvocationMessage]/message_id` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallInvocationMessage]/name` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallInvocationMessage]/role` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallInvocationMessage]/tool_call_id` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallResultMessage]/content` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallResultMessage]/created_timestamp` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallResultMessage]/message_id` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallResultMessage]/role` from the response with the `200` status
  - removed the required property `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallResultMessage]/tool_call_id` from the response with the `200` status
  - removed the optional property `message_with_tool_calls/items/oneOf[#/components/schemas/NodeTransitionMessage]/former_node_id` from the response with the `200` status
  - removed the optional property `message_with_tool_calls/items/oneOf[#/components/schemas/NodeTransitionMessage]/former_node_name` from the response with the `200` status
  - removed the optional property `message_with_tool_calls/items/oneOf[#/components/schemas/NodeTransitionMessage]/new_node_id` from the response with the `200` status
  - removed the optional property `message_with_tool_calls/items/oneOf[#/components/schemas/NodeTransitionMessage]/new_node_name` from the response with the `200` status
  - removed the optional property `message_with_tool_calls/items/oneOf[#/components/schemas/StateTransitionMessage]/former_state_name` from the response with the `200` status
  - removed the optional property `message_with_tool_calls/items/oneOf[#/components/schemas/StateTransitionMessage]/new_state_name` from the response with the `200` status
  - removed the optional property `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallInvocationMessage]/created_timestamp` from the response with the `200` status
  - removed the optional property `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallInvocationMessage]/thought_signature` from the response with the `200` status
  - removed the optional property `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallResultMessage]/successful` from the response with the `200` status
  - added `#/components/schemas/MessageBase, subschema #2` to the `message_with_tool_calls/items/oneOf[#/components/schemas/Message]/` response property `allOf` list for the response status `200`
  - added `#/components/schemas/NodeTransitionMessageBase, subschema #2` to the `message_with_tool_calls/items/oneOf[#/components/schemas/NodeTransitionMessage]/` response property `allOf` list for the response status `200`
  - added `#/components/schemas/StateTransitionMessageBase, subschema #2` to the `message_with_tool_calls/items/oneOf[#/components/schemas/StateTransitionMessage]/` response property `allOf` list for the response status `200`
  - added `#/components/schemas/ToolCallInvocationMessageBase, subschema #2` to the `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallInvocationMessage]/` response property `allOf` list for the response status `200`
  - added `#/components/schemas/ToolCallResultMessageBase, subschema #2` to the `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallResultMessage]/` response property `allOf` list for the response status `200`
- **2026-03-09** `8fbf8c54a142` — 3 breaking
  - the `from_number` request property's minLength was increased from `0` to `1`
  - the `override_agent_id` request property's minLength was increased from `0` to `1`
  - the `to_number` request property's minLength was increased from `0` to `1`
- **2026-02-23** `bcff6899fa2a` — 1 info
  - added the optional property `message_with_tool_calls/items/oneOf[#/components/schemas/ToolCallResultMessage]/successful` to the response with the `200` status
- **2026-02-10** `0bf5cea5dfcc` — 1 info
  - added the optional property `chat_cost/product_costs/items/is_transfer_leg_cost` to the response with the `200` status

---

[Operation](https://skmtc.dev/retellai/apis/retell-sdk/docs/create-sms-chat/post.md) · [API](https://skmtc.dev/retellai/apis/retell-sdk.md) · [Page](https://skmtc.dev/retellai/apis/retell-sdk/changes/create-sms-chat/post)