Summary

Automatically rename Telegram DM forum topics when the first message arrives in a new topic/session. Currently users must either manually rename topics or instruct the agent to do it via SOUL.md/system prompt - which is unreliable since the model may ignore the instruction.

Problem

When using Telegram DM topics (forum mode in 1:1 bot chats), new topics get generic names like "Topic #123". Users have to:

1. Manually rename each topic, OR
2. Add instructions to SOUL.md/MEMORY.md telling the agent to rename - but this is model-dependent and unreliable (the agent frequently forgets)

This is a gateway-level concern, not something that should depend on model compliance.

Proposed Solution

Add an autoTopicLabel config option to TelegramDirectConfig and/or TelegramAccountConfig:

{
  "telegram": {
    "direct": {
      "63448508": {
        "autoTopicLabel": true
      }
    }
  }
}

Behavior

When autoTopicLabel: true and a message arrives in a DM topic:

1. Detect if this is the first turn in the session (isFirstTurnInSession already exists in get-reply-run.ts)
2. After the agent reply is sent, generate a short topic label from the user message (first ~30-50 chars, or a lightweight LLM summary)
3. Call renameTopic() (API already exists and works)

Implementation Notes

• isFirstTurnInSession detection already exists in src/auto-reply/reply/get-reply-run.ts:235
• renameTopic API is fully functional via extensions/telegram/runtime-api.ts
• editForumTopic action permission exists in TelegramActionConfig
• Could use a simple heuristic (truncated first message) or a lightweight model call for better labels
• Should respect actions.editForumTopic permission
• Should be opt-in (default: false)

Alternatives Considered

• Agent-level instruction (SOUL.md): Unreliable - model frequently ignores the instruction
• Internal hook on message:sent: Would work but adds complexity; a config flag is cleaner
• Manual /set_topic_name command: PR feat: add /set_topic_name for telegram topic labels #46983 adds this, but does not solve the auto-rename case

Related

• PR feat: add /set_topic_name for telegram topic labels #46983 - /set_topic_name command (manual rename)
• Issue [Feature]: Session sidebar should show human-readable title + preview snippet #28168 - Session sidebar human-readable titles (similar concept for Control UI)
• Issue Feature: Smart session switch reminder based on context usage and topic change #47812 - Smart session switch reminder (topic change detection)