Canary token trick detects Claude context window degradation early
June 12, 2026
A practical workaround for Claude's silent context degradation: embed a low-stakes rule (e.g., always prepend a name) that gets silently dropped before more critical instructions fail. The canary disappears first because Claude prioritizes semantically meaningful rules, giving a few turns of warning before hallucinations begin.
HOW THIS AFFECTS YOU
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builderYou can implement this pattern in long-running Claude sessions or agentic pipelines to detect context overflow before it causes silent failures in tool calls or instruction-following.