How would you reason about schema evolution for tool calls without breaking agent reliability?

Instruction: Describe how you would evolve tool schemas while preserving stable model behavior.

Context: Checks whether the candidate can explain the core concept clearly and connect it to real production decisions. Describe how you would evolve tool schemas while preserving stable model behavior.

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I would treat schema evolution as a behavioral compatibility problem, not just a technical compatibility problem. Engineers may call a change backward-compatible because old clients still parse it, while models may still become less reliable because the tool now signals different meaning or offers too many new branches.

So...

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