Fix using anthropic models with responses API in AI SDK#146
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Ken Jiang (knjiang) merged 3 commits intomainfrom Mar 19, 2026
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A customer ran into an issue where AI SDK was failing because it has strict type checks using a zod format. It expects responses API to always have IDs for items and an annotations field, even if empty. We were dropping these when translating between providers. Fix this by restoring the ID if the format matches, otherwise putting a placeholder in. Also always fill in an empty annotations. At some point in the future we should look at adding annotations (openai) and citations (anthropic's version) to the universal format.
Ken Jiang (knjiang)
approved these changes
Mar 19, 2026
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i added a hook to validate via the AI SDK zod schema tests failed before : 
tests pass after: 
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A customer ran into an issue where AI SDK was failing because it has strict
type checks using a zod format. It expects responses API to always have IDs for
items and an annotations field, even if empty. We were dropping these when
translating between providers. Fix this by restoring the ID if the format
matches, otherwise putting a placeholder in. Also always fill in an empty
annotations.
At some point in the future we should look at adding annotations (openai) and
citations (anthropic's version) to the universal format.