When streaming was enabled on the gateway, the stream consumer created a
single message at the start and kept editing it as tokens arrived. Tool
progress messages were sent as separate messages below it. Since edits
don't change message position on Telegram/Matrix/Discord, the final
response ended up stuck above all tool progress messages — users had to
scroll up past potentially dozens of tool call lines to read the answer.
The agent already sends stream_delta_callback(None) at tool boundaries
(before _execute_tool_calls). The stream consumer was ignoring this
signal. Now it treats None as a segment break: finalizes the current
message (removes cursor), resets _message_id, and the next text chunk
creates a fresh message below the tool progress messages.
Timeline before:
[msg 1: 'Let me search...' → edits → 'Here is the answer'] ← top
[msg 2: tool progress lines] ← bottom
Timeline after:
[msg 1: 'Let me search...'] ← top
[msg 2: tool progress lines]
[msg 3: 'Here is the answer'] ← bottom (visible)
Reported by SkyLinx on Discord.
8dee82ea1e