---

name: build-skill description: Implement features and changes from implementation plans. Takes a plan file path as input and executes the implementation steps, then reports changes. Use when you have a detailed plan document and need to code it up, or want to implement specifications written in markdown format. allowed-tools: Read, Edit, Write, Bash, Glob, Grep

Build

Implement code changes and features from a detailed implementation plan. This skill reads a plan file, follows its instructions step-by-step, and reports the completed work.

Prerequisites

• A plan file in markdown format (typically from /quick-plan skill)
• The plan contains clear implementation steps
• You have access to the files that need to be modified

Workflow

1. Validate plan - Confirm a plan file path has been provided
2. Analyze plan - Read the plan and understand all implementation requirements
3. Implement - Execute each step of the plan, modifying code as needed
4. Report - Summarize changes and show diff statistics

Instructions

1. If no plan file path is provided, ask the user to provide it and stop
2. Read the plan file thoroughly - understand the full scope of work
3. Think deeply about the implementation approach before starting
4. Execute the plan step-by-step:
   • Create new files as specified
   • Modify existing files as outlined
   • Follow code patterns and conventions from the plan
5. After implementation, report:
   • Summary of completed work (bullet points)
   • Files changed with git diff --stat

Examples

Example 1: Building from a plan

CopyUser: /build specs/authentication-system.md
Claude: [Reads authentication-system.md plan]
[Implements all steps]
Summary:
- Created JWT middleware in src/middleware/auth.ts
- Added login endpoint to src/routes/auth.ts
- Added password hashing utilities
[Shows git diff --stat output]

Example 2: Implementing a feature plan

CopyUser: Build the payment integration from specs/stripe-integration.md
Claude: [Reads plan and implements stripe integration]
Summary:
- Integrated Stripe API client
- Created payment endpoints
- Added webhooks for payment events