Same topic, related formats. Practice these next.
Pin the tool definition to a specific API version so the model always calls a stable contract, and force an explicit migration whenever that version changes.
Imagine you give a helper a recipe card that says exactly which buttons to press on one coffee machine. As long as that machine stays the same, the card works every time. Now suppose someone swaps in a new machine where the buttons moved. The helper keeps pressing the old spots and makes a mess, but never realises anything is wrong because nothing beeps an error. The fix is to write the model number on the card. The helper only uses that card with that exact machine. When a new machine arrives, a person checks the card, updates it, and tests it before the helper is allowed to use it. The card never silently points at the wrong buttons, and a human always signs off on the change.
Everything you need to truly understand this topic: intuition, mechanics, step by step explanation, code, formulas, and worked example. Click to expand.
Everything you need to truly understand this topic: intuition, mechanics, step by step explanation, code, formulas, and worked example.
Everything important, quickly.
Define schema drift and why it fails silently, justify version pinning over targeting latest, explain how a bump forces an explicit migration, then layer on contract tests, runtime response validation, and regeneration from a spec. Close by dismissing the context-size and model-strength distractors as misdiagnoses of a contract problem.
Real products, models, and research that use this idea.
What an interviewer would ask next. Try answering before peeking at the approach.
Red flags and common mistakes that signal junior thinking. Click to expand.
Assuming a bigger context window or a smarter model prevents schema drift. The problem is a stale contract, not model capacity, so neither helps when the API silently changes shape.
The night-before-the-interview bullets. Scan these on the way to the call.
Primary sources. Skim if you want the original framing.