Fable's judgement

📰 Simon Willison's Blog

Learn to leverage Fable's judgement for efficient testing and development workflows

intermediate Published 3 Jul 2026
Action Steps
  1. Configure Fable to use automated testing for larger features
  2. Test Fable's judgement by comparing automated and manual testing results
  3. Apply Fable's judgement to optimize testing workflows
  4. Run experiments to evaluate the effectiveness of Fable's judgement
  5. Compare the outcomes of Fable's judgement with traditional testing methods
Who Needs to Know This

Developers and testers on a team can benefit from understanding how to effectively utilize Fable's judgement for automated testing, improving overall productivity and efficiency.

Key Insight

💡 Trusting Fable's judgement can lead to more efficient testing and development workflows

Share This
💡 Let Fable use its own judgement for efficient testing workflows!

Key Takeaways

Learn to leverage Fable's judgement for efficient testing and development workflows

Full Article

One of the most interesting tips I got from the Fireside Chat I hosted with Cat Wu and Thariq Shihipar from the Claude Code team at AIE on Wednesday was to let Fable (and to a certain extent Opus) use their own judgement rather than dictating how they should work. The example they gave was testing. You can tell Fable "only use automated testing for larger featu
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