Leanspec

LeanSpec is a lightweight specification methodology for AI assisted software development, together with the tooling that supports it. Its premise is that specs should be short enough to fit in working memory for both a person and an AI model: under 300 lines and readable in 5 to 10 minutes, clear enough to implement from and concise enough to maintain. Teams write specs as they code and capture decisions when they matter, rather than following a spec first waterfall. A project can begin with a README and status tracking and add structure only when needed, from a solo developer to an enterprise team. The toolchain includes a command line interface for workflow automation, an MCP server that lets AI agents read, search and implement from specs, a VS Code extension and GitHub Actions for CI and CD. The site lists Cursor, GitHub Copilot, Aider and Claude Desktop through MCP as supported tools. Running leanspec init creates an AGENTS.md file with LeanSpec guidance, and symlinks such as CLAUDE.md and GEMINI.md are created so that each coding tool finds the same instructions. LeanSpec is for developers and teams who use coding agents and want a consistent record of intent for the agents to work from. The site publishes no prices and shows no paid plans.