Compaction creates a new failure mode for coding agents: critical bug details can vanish mid-fix
blaizedsouza · x · 2026-11-11
Paul Iusztin highlights a new failure mode introduced by context compaction in coding agents: imagine your agent discovers a bug, identifies the root cause, and starts implementing a fix — then compaction kicks in. If the summary drops a critical detail, the agent may repeat work or make the same mistake again, and debugging gets harder because the missing information is no longer in active context.
The takeaway: compaction isn't just about reducing tokens — you need to explicitly test whether your agent can keep working correctly after its context has been compressed. The accompanying image shows Claude Code's /compact implementation: triggered at 80% context usage, keeping recent tokens and summarizing history into a skeleton.
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