Use a 'Context Canary' Rule to Detect AI Agent Context Overflow

tekbog · x · 2026-08-14

When building AI agents, you can use a context canary in your AGENTS.md to detect when the model's context gets corrupted or overflows.

The trick is to instruct the model to always include a specific word or phrase in its replies (e.g., calling the user 'big dog'). If the model stops outputting this phrase during a long interaction, it's a clear indicator that the context is messed up. Combining this with a dedicated plan folder and strict specifications improves overall agent stability.

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