Bug

/model command in Telegram supergroup General topic returns a plain text fallback instead of the interactive inline keyboard picker. Gateway logs show:

WARNING gateway.platforms.telegram: [Telegram] send_model_picker failed: Message thread not found

Root Cause

send_model_picker() in gateway/platforms/telegram.py was bypassing _message_thread_id_for_send(), the class method that correctly returns None for the General topic thread_id "1". Instead, it did:

message_thread_id=int(thread_id) if thread_id else None

Telegram's Bot API rejects message_thread_id=1 because the General topic doesn't use that parameter — it should be omitted entirely.

Every other inline keyboard method (send_exec_approval, send_slash_confirm, regular send()) correctly uses the two-step pattern: _metadata_thread_id(metadata) → _message_thread_id_for_send(thread_id). send_model_picker was the only method that didn't.

Fix

Use the same helper methods as all other methods:

thread_id = self._metadata_thread_id(metadata)
message_thread_id = self._message_thread_id_for_send(thread_id)
kwargs: Dict[str, Any] = {
    "chat_id": int(chat_id),
    "text": text,
    "parse_mode": ParseMode.MARKDOWN,
    "reply_markup": keyboard,
    **self._link_preview_kwargs(),
}
if message_thread_id is not None:
    kwargs["message_thread_id"] = message_thread_id
msg = await self._bot.send_message(**kwargs)

Tests

Added tests/gateway/test_telegram_model_picker_thread.py with 3 tests:

• General topic (thread_id="1") → message_thread_id omitted (the bug case)
• Real topic (thread_id="42") → message_thread_id=42 passed
• No metadata → message_thread_id not included

All 3 new tests + all 11 existing test_telegram_thread_fallback tests pass.

Verification

Tested in production on a Telegram supergroup where /model previously returned text fallback. After the fix, the interactive model picker renders correctly in the General topic.