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Your agent's SFT loss falls, but it starts inventing tool receipts. How do you debug the training run?

Inspect what the objective actually rewards. Trace a tool response through serialization, labels, truncation and evaluation before changing the learning rate or adding more data.

Updated Oct 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

Inspect what the objective actually rewards. Trace a tool response through serialization, labels, truncation and evaluation before changing the learning rate or adding more data.

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FEDITOR'S NOTE

Original practice scenario. Company tags indicate technical relevance, not a reported interview question.

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