Simon Willison 1/11/2026

A Software Library with No Code

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The article discusses Drew Breunig's experimental 'whenwords' library for time formatting, which contains no traditional code. Instead, it provides a specification, an AGENTS.md file, and YAML-based conformance tests. The idea is to use AI coding agents to generate the actual implementation in any required programming language, highlighting the power of language-independent test suites and modern AI tools.

A Software Library with No Code

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