Simon Willison
8/10 signal
sqlite-utils 4.0rc2, mostly written by Claude Fable (for about $149.25)
agentictool-use
What happened
Simon Willison used Claude Fable (via Claude Code) to perform a pre-release review of sqlite-utils 4.0. The agent identified five critical release blockers, including a major data-loss bug where Table.delete_where() failed to commit transactions, poisoning subsequent operations. Over 37 prompts, the agent and developer executed 34 commits, modifying 30 files (+1,321/-190 lines) to resolve the issues.
Why it matters
It demonstrates that agentic workflows can successfully identify and fix complex, state-dependent architectural bugs across large codebases.
The take
This is a stellar real-world validation of agentic coding tools. Fable didn't just find syntax errors; it identified state-management and transaction-handling bugs that require deep execution-path reasoning. It shows that SOTA agents are transitioning from glorified autocomplete to genuine, multi-file QA and refactoring partners.
Do this
Integrate agentic review steps (like Claude Code/Fable) into your pre-release QA pipeline to catch edge-case state bugs.
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