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bazel-build-optimization

Improve Bazel builds in large repositories containing multiple projects. Get guidance on build configuration, shared remote caches, remote execution, dependency management, custom build rules, and diagnosing build problems.

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Optimize Bazel builds for large-scale monorepos. Use when configuring Bazel, implementing remote execution, or optimizing build performance for enterprise codebases.

See how to install

Good for

  • Set up Bazel for a monorepo
  • Configure remote caching and execution
  • Review slow build configurations
  • Plan a migration to Bazel

Files included (2)

  • SKILL.md2.0 KB
  • references/details.md7.5 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Bazel Build Optimization

Production patterns for Bazel in large-scale monorepos.

When to Use This Skill

  • Setting up Bazel for monorepos
  • Configuring remote caching/execution
  • Optimizing build times
  • Writing custom Bazel rules
  • Debugging build issues
  • Migrating to Bazel

Core Concepts

1. Bazel Architecture

workspace/
├── WORKSPACE.bazel       # External dependencies
├── .bazelrc              # Build configurations
├── .bazelversion         # Bazel version
├── BUILD.bazel           # Root build file
├── apps/
│   └── web/
│       └── BUILD.bazel
├── libs/
│   └── utils/
│       └── BUILD.bazel
└── tools/
    └── bazel/
        └── rules/

2. Key Concepts

ConceptDescription
TargetBuildable unit (library, binary, test)
PackageDirectory with BUILD file
LabelTarget identifier //path/to:target
RuleDefines how to build a target
AspectCross-cutting build behavior

Templates and detailed worked examples

Full template library and detailed worked examples live in references/details.md. Read that file when you need the concrete templates.

Best Practices

Do's

  • Use fine-grained targets - Better caching
  • Pin dependencies - Reproducible builds
  • Enable remote caching - Share build artifacts
  • Use visibility wisely - Enforce architecture
  • Write BUILD files per directory - Standard convention

Don'ts

  • Don't use glob for deps - Explicit is better
  • Don't commit bazel-* dirs - Add to .gitignore
  • Don't skip WORKSPACE setup - Foundation of build
  • Don't ignore build warnings - Technical debt

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