Simon Willison, Datasette creator, interviews Anthropic's Claude Code team

I shrunk the system prompt and tool definitions from 40k to 4k minimum tokens and i quite prefer it https://twitter.com/simonw/status/2079553486568800405

I got some really useful Claude prompting tips from @_catwu and @trq212 - it's time to stop overloading our prompts with examples and lists of things not to do, Fable works better without those Claude Code's own system prompt recently shrunk by 80%!

A big thing about Fable (and Sol, though a little bit less) is that you need to be really careful about treating it the way you would a less capable model. Skills that worked well for Opus often make Fable outputs worse, and too many lists of negative instructions can do the… Show more