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fix(agent): add time-based recovery to compression anti-thrashing protection (#14694)

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The anti-thrashing guard permanently disabled auto-compression after 2
ineffective compressions (<10% savings each), with no way to recover
during a long session. Add a 300-second cooldown: once enough time has
elapsed since the last compression, reset the ineffective counter so
the session gets another chance. This preserves the rapid-fire guard
while allowing recovery when significant new context has accumulated.
This commit is contained in:
Tranquil-Flow 2026-04-25 08:52:43 +10:00
parent 00c3d848d8
commit e1393670ed
2 changed files with 58 additions and 0 deletions
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15
agent/context_compressor.py
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@ -297,6 +297,7 @@ class ContextCompressor(ContextEngine):
self._last_summary_error = None
self._last_compression_savings_pct = 100.0
self._ineffective_compression_count = 0
self._last_compression_time = 0.0
def update_model(
self,
@ -389,6 +390,7 @@ class ContextCompressor(ContextEngine):
# Anti-thrashing: track whether last compression was effective
self._last_compression_savings_pct: float = 100.0
self._ineffective_compression_count: int = 0
self._last_compression_time: float = 0.0
self._summary_failure_cooldown_until: float = 0.0
self._last_summary_error: Optional[str] = None
@ -407,6 +409,18 @@ class ContextCompressor(ContextEngine):
tokens = prompt_tokens if prompt_tokens is not None else self.last_prompt_tokens
if tokens < self.threshold_tokens:
return False
# Anti-thrashing: time-based recovery — if enough time has passed since
# the last compression, reset the ineffective counter so the session
# gets another chance. 300s is enough for significant new context to
# accumulate, making another attempt worthwhile.
if (self._ineffective_compression_count >= 2
and self._last_compression_time > 0
and time.monotonic() - self._last_compression_time >= 300):
self._ineffective_compression_count = 0
if not self.quiet_mode:
logger.info(
"Anti-thrashing cooldown expired — re-enabling auto-compression"
)
# Anti-thrashing: back off if recent compressions were ineffective
if self._ineffective_compression_count >= 2:
if not self.quiet_mode:
@ -1279,6 +1293,7 @@ The user has requested that this compaction PRIORITISE preserving all informatio
saved_estimate = display_tokens - new_estimate
# Anti-thrashing: track compression effectiveness
self._last_compression_time = time.monotonic()
savings_pct = (saved_estimate / display_tokens * 100) if display_tokens > 0 else 0
self._last_compression_savings_pct = savings_pct
if savings_pct < 10: