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SKILL.md

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+---
+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**
+```
+User: /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**
+```
+User: 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
+```