Telegram channel plugin: forum Topics support (message_thread_id in channel meta + reply tool)

Feature request for the official telegram channel plugin

Telegram supergroups with Topics (forums) are a natural UI for multi-session workflows: one topic per Claude Code session, the topics list as a session browser. The official telegram plugin currently makes this impossible:

• inbound messages drop message_thread_id, so the session cannot tell which topic the user wrote in;
• the reply tool has no way to post into a topic — answers land in General.

Proposed change

Tiny and backward compatible (+14/−4 in server.ts):

1. include message_thread_id in the <channel> meta when is_topic_message;
2. accept optional message_thread_id in reply and pass it to sendMessage/sendPhoto/sendDocument;
3. one sentence in the instructions text telling the model to echo the thread id back.

A ready patch exists and has been running in production for days against a live bot (macOS/bun; verified topic routing incl. chunked replies and attachments, DM behavior unchanged): https://github.com/ipauler/claude-plugins-official/commit/f777c0c49a5eae431aeca4cf08564a77f007903e — it was submitted as anthropics/claude-plugins-official#5391 and auto-closed by policy (team-members-only repo), so filing it here as requested by the bot.

🤖 Generated with Claude Code