bmad-development-execution_skill

Overview

This skill implements developer-ready user stories end-to-end by producing code, tests, and traceable documentation. It emphasizes small, reviewable changes, strict testing discipline, and clear links back to requirements and architecture. Outputs include code diffs, test results, an updated story record, and an implementation-notes summary.

How this skill works

The skill first verifies prerequisites and restates the story scope from the provided story file. It plans the work, lists affected files and tests, applies incremental code changes with explanatory notes, runs required test suites capturing output verbatim, and updates the story status and implementation-notes. Blockers halt work and produce remediation steps rather than speculative changes.

When to use it

• You have a developer-ready story file and want it implemented in code and tests
• You say phrases like “Implement story X”, “Start coding”, or “Develop this story”
• Architecture references and UX guidance are available for the story
• You need traceable, test-driven delivery that maps to requirements and architecture
• You want small, reviewable diffs and a documented development summary

Best practices

• Confirm the story file and architecture refs before starting; do not proceed without them
• Keep changes minimal and focused to make reviews fast and safe
• Run the full test suite and include verbatim command output in the record
• Update the story’s Dev Agent Record with status, learnings, and risks
• Stop and document blockers; provide concrete remediation steps rather than guessing

Example use cases

• Implement a new API endpoint described in a prepared story with accompanying tests
• Complete a frontend feature using provided UX guidance and component architecture notes
• Add validation logic and unit tests tied to quality-plan scenarios from QA
• Deliver a backend change where architecture patterns and story acceptance criteria exist
• Produce an implementation-notes summary for stakeholder handoff after completion