Teknium e36c804bc2 fix: prevent already_sent from swallowing empty responses after tool calls (#10531) ...

When a model (e.g. mimo-v2-pro) streams intermediate text alongside tool
calls ("Let me search for that") but then returns empty after processing
tool results, the stream consumer already_sent flag is True from the
earlier text delivery.  The gateway suppression check
(already_sent=True, failed=False → return None) would swallow the final
response, leaving the user staring at silence after the search.

Two changes:

1. gateway/run.py return path: skip already_sent suppression when the
   final_response is "(empty)" or empty — the user needs to know the
   agent finished even if streaming sent partial content earlier.

2. gateway/run.py response handler: convert the internal "(empty)"
   sentinel to a user-friendly warning instead of delivering the raw
   sentinel string.

Tests added for all empty/None/sentinel cases plus preserved existing
suppression behavior for normal non-empty responses.

2026-04-15 14:26:45 -07:00

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