ln-781-build-verifier

Paths: File paths (references/, ../ln-*) are relative to this skill directory.

MANDATORY READ: Load references/ci_tool_detection.md — build command registry, exit-code preservation, and compact output rules.

ln-781-build-verifier

Type: L3 Worker Category: 7XX Project Bootstrap

Purpose

Detects project types, restores dependencies, executes builds, and verifies successful compilation.

Scope:

• Auto-detect project types from file markers
• Restore dependencies using appropriate package manager
• Execute build commands for each project
• Verify build artifacts exist

Out of Scope:

• Running tests (handled by ln-782)
• Container operations (handled by ln-783)
• Workflow orchestration (handled by ln-780)

When to Use

| Scenario | Use This Skill | |----------|---------------| | Standalone-capable | Yes | | Standalone build verification | Yes | | CI/CD pipeline build step | Yes | | Test execution needed | No, use ln-782 |

Workflow

Step 1: Detect Project Types

Scan project root for type markers.

| Marker File | Project Type | Build System | |------------|--------------|--------------| | package.json | Node.js/Frontend | npm/yarn/pnpm | | *.csproj | .NET | dotnet | | setup.py / pyproject.toml | Python | pip/poetry | | go.mod | Go | go build | | Cargo.toml | Rust | cargo | | pom.xml | Java/Maven | mvn | | build.gradle | Java/Gradle | gradle |

Step 2: Restore Dependencies

For each detected project, restore dependencies before building.

| Project Type | Dependency Restoration | |--------------|----------------------| | Node.js | Install packages from lock file | | .NET | Restore NuGet packages | | Python | Install from requirements or pyproject | | Go | Download modules | | Rust | Fetch crates |

Step 3: Build Projects

Execute build for each project type in Release/Production mode.

| Project Type | Build Mode | Expected Outcome | |--------------|-----------|------------------| | Node.js | Production | Bundled assets in dist/ or build/ | | .NET | Release | Compiled DLLs in bin/Release/ | | Python | Editable install | Package installed in environment | | Go | Production | Compiled binary | | Rust | Release | Optimized binary in target/release/ |

Step 4: Verify Build Artifacts

Confirm build outputs exist.

| Project Type | Artifact Check | |--------------|---------------| | Node.js | dist/ or build/ directory exists, contains files | | .NET | DLL files in bin/Release/{framework}/ | | Python | Package importable | | Go | Binary executable exists | | Rust | Binary in target/release/ |

Step 5: Report Results

Return structured results to orchestrator.

Result Structure:

| Field | Description | |-------|-------------| | projectName | Name of the project | | projectType | Detected type (nodejs, dotnet, python, etc.) | | status | success / failed | | duration | Build time in seconds | | outputPath | Path to build artifacts | | errorMessage | Error details if failed |

Error Handling

| Error Type | Recovery Action | |------------|----------------| | Dependency restore failed | Check network, verify lock file integrity | | Compilation errors | Log full error output, report as failed | | Missing build tool | Report required tool installation | | Timeout | Report timeout, suggest increasing limit |

Critical Rules

1. Always restore dependencies first - builds may fail without fresh dependencies
2. Use production/release mode - development builds may hide issues
3. Verify artifacts exist - successful exit code is not sufficient
4. Report all projects - include both successful and failed builds

Monitor (2.1.98+): For build/restore commands expected >30s, use Monitor. Fallback: Bash(run_in_background=true).

Definition of Done

• [ ] All project types detected
• [ ] Dependencies restored for each project
• [ ] Build executed for each project
• [ ] Artifacts verified to exist
• [ ] Results returned to orchestrator

Reference Files

• Parent: ../ln-780-bootstrap-verifier/SKILL.md

Version: 2.0.0 Last Updated: 2026-01-10