Feature Request: Add thread/topic title support in Reply Message API

[zouyike]

Feature Request

API area: IM v1 — Messages / Threads

Problem

When creating threads (话题) in P2P (1:1) chats via the Reply Message API (POST /im/v1/messages/:message_id/reply with reply_in_thread: true), the resulting thread window always displays a generic title "话题" (Topic). There is currently:

1. No parameter in the Reply Message API to set a custom thread title/name
2. No dedicated API endpoint to update a thread's title after creation
3. No way for users to edit thread titles in the Feishu PC/mobile client for P2P chats

This contrasts with 话题群 (topic groups), where topic titles are fully supported.

Use Case

We run a multi-agent AI assistant system built on the Feishu Open Platform. Each agent creates branched thread windows for parallel conversations via the Reply API. When a user has 5+ active threads with the same bot, they all show "话题" — making it impossible to distinguish between them without opening each one.

Proposed Solution

1. Add an optional thread_name field to ReplyMessageRequestBody for the Reply Message API:

   {
     "content": "...",
     "msg_type": "text",
     "reply_in_thread": true,
     "thread_name": "SSH Security Hardening"
   }

2. Add a PATCH endpoint for updating thread titles:

   PATCH /im/v1/threads/:thread_id
   { "name": "Updated Thread Title" }
   

3. Enable client-side editing of thread titles in P2P chats (currently only available in topic groups).

Impact

Thread naming would significantly improve UX for bot-heavy workflows where users maintain multiple concurrent conversation branches. The thread_id (omt_*) infrastructure already exists — this request is about exposing title metadata for it.

Thank you for considering this enhancement.