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This is instructions text, not a new field or event. The reasoning behind it is in Prompting for what the model hears.

Grounding hard nouns

Put the exact spelling in instructions and the model only has to get close. A name or a drug it has no reason to expect gets transcribed as whatever it sounds most like. Give it the list your callers will actually draw from, spelled the way you want it recognized and said back.
instructions: ground names and terms against a known list
Adapt the two lists to whatever your callers actually name: branches, plans, product lines, staff. Keep the list to names that are realistically confusable and don’t change every call, a roster or a formulary rather than one caller’s own contacts; for a list that’s genuinely different per caller, pass it in as part of that call’s setup instead of growing a static list that only some callers ever need.

Next steps

Prompt guide

Why this works: fused transcription and generation resolving toward what instructions already said was plausible.

Reference

Where instructions sits in the session object.
Last modified on October 14, 2026