Tool/function calling only works as well as the schema behind it. A structurally valid schema can still make an agent call your tool wrong — and a subtly broken one can fail silently. This post covers what actually goes wrong, how to catch it before it reaches a live model, and a worked example.
Source: [Dev.to](https://dev.to/jsonutiltools/validating-openai-anthropic-tool-calling-schemas-535)