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Claude Fable 5 handled integrating compound foreign key creation into the library, and the resulting API design felt exactly consistent with how the rest of sqlite-utils already worked.

The author had Claude Fable 5 design the compound foreign key creation API, and found the resulting design fit naturally with the rest of sqlite-utils. ✦ AI generated

Simon Willison · Simon Willison's Weblog · 2026-07-07 · original ↗

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I started with a breaking change to the table.foreign_keys introspection method, and then decided to see if Claude Fable 5 could handle the more fiddly job of integrating compound foreign key creation into the library. The API design it helped create felt exactly right to me - consistent with how the rest of the library worked already.

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✳ Claude Fable 5 ✳ table.foreign_keys

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