--- title: "Changes to Send message." method: POST path: "/api/v1/projects/{projectId}/conversations/{sessionId}/messages" --- # Changes to Send message. `POST /api/v1/projects/{projectId}/conversations/{sessionId}/messages` > Every recorded change to this operation, newest first. ## Timeline Changed in 5 of 10 revisions. - **2026-11-03** `77aab4354382`: 2 breaking, 8 warning, 7 info - **2026-07-17** `b80e6dfcf78d`: 2 warning, 10 info - **2023-07-27** `2cd2d58839d0`: 2 info - **2023-07-12** `1675fc6aa16a`: 1 warning, 8 info - **2023-06-02** `1842d7fd0430`: 16 warning, 5 info ## Changes - **2026-11-03** `77aab4354382`: 2 breaking, 8 warning, 7 info - removed the media type `application/json` from the request body - the response property `data/response_feedback` became nullable for the status `200` - added the new `422.00` enum value to the `data/code` response property for the response status `400` - added the new `422.00` enum value to the `data/code` response property for the response status `401` - added the new `422.00` enum value to the `data/code` response property for the response status `404` - added the new `422.00` enum value to the `data/code` response property for the response status `429` - added the new `422.00` enum value to the `data/code` response property for the response status `500` - added the new `disliked` enum value to the `data/response_feedback/reaction` response property for the response status `200` - added the new `liked` enum value to the `data/response_feedback/reaction` response property for the response status `200` - added the new `neutral` enum value to the `data/response_feedback/reaction` response property for the response status `200` - added the media type `multipart/form-data` to the request body - added the non-success response with the status `409` - added the optional property `data/citations_external` to the response with the `200` status - added the optional property `data/citations_hidden` to the response with the `200` status - added the optional property `data/customer_intelligence` to the response with the `200` status - added the optional property `data/tools` to the response with the `200` status - removed the `neutral, disliked, liked` enum value from the `data/response_feedback/reaction` response property for the response status `200` - **2026-07-17** `b80e6dfcf78d`: 2 warning, 10 info - added the new `Agent id is required` enum value to the `data/message` response property for the response status `404` - added the new `Agent with id {projectId} not found` enum value to the `data/message` response property for the response status `404` - added the new optional `query` request parameter `external_id` - added the new optional request property `chatbot_model` - added the new optional request property `custom_persona` - added the new optional request property `response_source` - added the non-success response with the status `429` - added the optional property `data/metadata/external_id` to the response with the `200` status - added the optional property `data/metadata/request_source` to the response with the `200` status - added the optional property `data/response_feedback` to the response with the `200` status - removed the `Project id is required` enum value from the `data/message` response property for the response status `404` - removed the `Project with id {projectId} not found` enum value from the `data/message` response property for the response status `404` - **2023-07-27** `2cd2d58839d0`: 2 info - added the non-success response with the status `400` - added the optional property `data/metadata` to the response with the `200` status - **2023-07-12** `1675fc6aa16a`: 1 warning, 8 info - removed the optional property `data/message` from the response with the `200` status - added the optional property `data/citations` to the response with the `200` status - added the optional property `data/conversation_id` to the response with the `200` status - added the optional property `data/created_at` to the response with the `200` status - added the optional property `data/id` to the response with the `200` status - added the optional property `data/openai_response` to the response with the `200` status - added the optional property `data/updated_at` to the response with the `200` status - added the optional property `data/user_id` to the response with the `200` status - added the optional property `data/user_query` to the response with the `200` status - **2023-06-02** `1842d7fd0430`: 16 warning, 5 info - deleted the `query` request parameter `external_id` - removed the request property `chatbot_model` - removed the request property `custom_persona` - removed the request property `response_source` - removed the optional property `data/citations` from the response with the `200` status - removed the optional property `data/conversation_id` from the response with the `200` status - removed the optional property `data/created_at` from the response with the `200` status - removed the optional property `data/id` from the response with the `200` status - removed the optional property `data/metadata` from the response with the `200` status - removed the optional property `data/openai_response` from the response with the `200` status - removed the optional property `data/response_feedback` from the response with the `200` status - removed the optional property `data/updated_at` from the response with the `200` status - removed the optional property `data/user_id` from the response with the `200` status - removed the optional property `data/user_query` from the response with the `200` status - added the new `Project id is required` enum value to the `data/message` response property for the response status `404` - added the new `Project with id {projectId} not found` enum value to the `data/message` response property for the response status `404` - removed the non-success response with the status `400` - removed the non-success response with the status `429` - added the optional property `data/message` to the response with the `200` status - removed the `Agent id is required` enum value from the `data/message` response property for the response status `404` - removed the `Agent with id {projectId} not found` enum value from the `data/message` response property for the response status `404` --- [Operation](https://skmtc.dev/poll-the-people/apis/customgpt-ai/docs/api/v1/projects/:projectId/conversations/:sessionId/messages/post.md) - [API](https://skmtc.dev/poll-the-people/apis/customgpt-ai.md) - [Page](https://skmtc.dev/poll-the-people/apis/customgpt-ai/changes/api/v1/projects/:projectId/conversations/:sessionId/messages/post)