[Bug] Agent thinking messages persist in Telegram chat after final response

[graycyrus]

Summary

When the agent processes a message on Telegram, its intermediate "thinking" messages remain visible in the chat even after the final response is sent. They should be removed/deleted once the final message arrives.

Problem

Steps to reproduce:

1. Send a message to the agent via Telegram channel
2. Observe the agent's thinking/reasoning messages appearing in the chat (e.g. tool calls, intermediate reasoning)
3. Agent sends final response
4. Thinking messages are still visible in the chat alongside the final response

Expected: Thinking/intermediate messages should be deleted or replaced when the final agent response is sent, so the user only sees the clean final message.

Platform: Telegram channel integration

Solution

When the final agent response is ready to be sent on Telegram:

• Delete all intermediate thinking/tool-call messages that were sent during processing
• Only the final response message should remain in the chat
• This likely requires tracking message IDs of thinking messages so they can be deleted via Telegram Bot API (deleteMessage)

Acceptance criteria

• Thinking cleared — All intermediate thinking/reasoning messages are deleted from Telegram chat when final response is sent
• Final message clean — Only the final agent response remains visible to the user
• Message tracking — Thinking message IDs are tracked so they can be reliably deleted
• Error handling — If deletion fails (e.g. message already deleted, permissions), it degrades gracefully without breaking the response

Related

• Telegram channel provider in src/openhuman/channels/providers/
• Proactive/streaming message delivery logic