Spec-driven development — writing specifications before code, multi-file spec format, task generation, delta specs, lifecycle management, and project setup. Use when setting up SDD in a project, writing feature specs, or improving an existing spec workflow.
Triggers: "write a spec", "spec-driven", "specification", "requirements doc", "feature spec", "set up specs", "spec format", "spec workflow", "spec template", "delta spec", "spec tasks"
