build-fix

Build Fix Skill

Fix build and compilation errors quickly with minimal code changes. Get the build green without refactoring.

When to Use

This skill activates when:

• User says "fix the build", "build is broken"
• TypeScript compilation fails
• the build command or type checker reports errors
• User requests "minimal fixes" for errors

What It Does

Delegates to the build-fixer agent (Sonnet model) to:

1. Collect Errors

   • Run the project's type check command (e.g., tsc --noEmit, mypy, cargo check, go vet)
   • Or run the project's build command to get build failures
   • Categorize errors by type and severity

2. Fix Strategically

   • Add type annotations where missing
   • Add null checks where needed
   • Fix import/export statements
   • Resolve module resolution issues
   • Fix linter errors blocking build

3. Minimal Diff Strategy

   • NO refactoring of unrelated code
   • NO architectural changes
   • NO performance optimizations
   • ONLY what's needed to make build pass

4. Verify

   • Run the project's type check command after each fix
   • Ensure no new errors introduced
   • Stop when build passes

Agent Delegation

Task(
  subagent_type="pepcode:build-fixer",
  model="sonnet",
  prompt="BUILD FIX TASK

Fix all build and TypeScript errors with minimal changes.

Requirements:
- Run tsc/build to collect errors
- Fix errors one at a time
- Verify each fix doesn't introduce new errors
- NO refactoring, NO architectural changes
- Stop when build passes

Output: Build error resolution report with:
- List of errors fixed
- Lines changed per fix
- Final build status"
)

Stop Conditions

The build-fixer agent stops when:

• Type check command exits with code 0
• Build command completes successfully
• No new errors introduced

Output Format

BUILD FIX REPORT
================

Errors Fixed: 12
Files Modified: 8
Lines Changed: 47

Fixes Applied:
1. src/utils/validation.ts:15 - Added return type annotation
2. src/components/Header.tsx:42 - Added null check for props.user
3. src/api/client.ts:89 - Fixed import path for axios
...

Final Build Status: ✓ PASSING
Verification: [type check command] (exit code 0)

Best Practices

• One fix at a time - Easier to verify and debug
• Minimal changes - Don't refactor while fixing
• Document why - Comment non-obvious fixes
• Test after - Ensure tests still pass

Use with Other Skills

Combine with other skills for comprehensive fixing:

With Ultrawork:

/ultrawork fix all build errors

Spawns multiple build-fixer agents in parallel for different files.

With Ralph:

/ralph fix the build

Keeps trying until build passes, even if it takes multiple iterations.

With Pipeline:

/pipeline debug "build is failing"

Uses: explore → architect → build-fixer workflow.