Datasette 1.0a33 Ships ?_extra= for Queries and Rows — Built With a Fable 5 + GPT-5.5 Agent Workflow

Simon Willison·medium signal

Simon Willison released Datasette 1.0a33 on June 11, extending the documented ?_extra= JSON API pattern beyond tables to queries and rows, a step toward stable 1.0. Notably, he built the companion 'Datasette extras explorer' tool by planning with Claude Fable 5 in Claude Code and implementing with GPT-5.5 xhigh in Codex Desktop — a concrete example of splitting one feature across two frontier models. The explorer surfaces 30+ selectable extras with shareable URL-hash state.