Spec-Driven Prototyping with OpenSpec and Claude Code

Prototyping with an AI assistant often means starting over when the chat session ends or the output drifts from what was intended. OpenSpec keeps the specification in the repo alongside the code, so Claude Code always has the same context to work from. The result is a prototype built from a clear plan rather than a series of disconnected prompts.

What you'll learn

• Set up OpenSpec in a project and connect it to Claude Code
• Install OpenSpec, run init, and see how the AGENTS.md file and slash commands wire into Claude Code.
• Generate a spec before writing any code
• Use the proposal command to produce a proposal, spec delta, design, and task list, then review and edit each one.
• Apply a spec to build a working prototype
• Run the apply command, watch Claude Code implement the tasks, and archive the change into the permanent spec library.