How Function Calling Actually Works: Grammar-Constrained Decoding Under the Hood
How Function Calling Actually Works: Grammar-Constrained Decoding Under the Hood You send a function definition with a JSON schema. The model responds with a perfect tool call — valid JSON, correct types, enum values from the allowed list, required fields present. No parsing errors. No retries. It…
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- 2026-10-29 07:34 · DEV Community — Machine Learning
How Function Calling Actually Works: Grammar-Constrained Decoding Under the Hood