Write, update, and maintain living specification documents and propose change documents. Use when user says 'write a spec', 'create a spec', 'spec out', 'update spec', 'spec this', 'design a feature', 'write a feature spec', or needs to create/modify specs in docs/specs/ or propose changes in docs/changes/. Handles the complete spec lifecycle: creation, updates, gap analysis, and change proposals.
How to install spec-writer?
fx/cc/spec-writer
$npx -y skills add fx/cc --skill spec-writerInstalls into the current project.
›Prefer a prompt? Paste this to your agent
Run `npx skills use "https://github.com/fx/cc" --skill "fx/cc/spec-writer"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/fx/cc" that are relevant to the current task. Run `npx skills add "https://github.com/fx/cc"` and select the relevant skills, then follow their instructions.
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