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fix(agent): strip trailing empty assistant messages before API calls to prevent prefill rejection

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ygd58 2026-03-20 08:02:01 +01:00 • committed by Teknium
parent 2de42ba690
commit 5407d12bc6
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1 changed files with 12 additions and 1 deletions
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13
run_agent.py
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@ -2443,7 +2443,18 @@ class AIAgent:
"Pre-call sanitizer: added %d stub tool result(s)", "Pre-call sanitizer: added %d stub tool result(s)",
len(missing_results), len(missing_results),
) )
# 3. Strip trailing empty assistant messages to prevent prefill rejection.
# These can leak from Responses API reasoning-only turns (Codex/MiniMax)
# where an empty assistant message is required by the Responses API but
# must NOT be sent to Chat Completions or Anthropic Messages API providers.
while (
messages
and messages[-1].get("role") == "assistant"
and not (messages[-1].get("content") or "").strip()
and not messages[-1].get("tool_calls")
):
logger.debug("Pre-call sanitizer: removed trailing empty assistant message")
messages = messages[:-1]
return messages return messages
@staticmethod @staticmethod