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fix(agent): skip compression when latest summary leaves no messages to summarize #59737

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fix(agent): skip compression when latest summary leaves no messages to summarize #59737

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9 changes: 9 additions & 0 deletions agent/context_compressor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2777,6 +2777,15 @@ def compress(self, messages: List[Dict[str, Any]], current_tokens: int = None, f
if summary_body and not self._previous_summary:
self._previous_summary = summary_body
turns_to_summarize = messages[max(compress_start, summary_idx + 1):compress_end]
if not turns_to_summarize:
self._ineffective_compression_count += 1
self._last_compression_savings_pct = 0.0
if not self.quiet_mode:
logger.warning(
"Compression skipped: latest context summary leaves no messages "
"between protected head and tail"
)
return messages
elif self._previous_summary:
# No handoff summary found in the current messages, but
# _previous_summary is non-empty — it was set by a different
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