MCPInstall

moon

by hyperb1issDevOps & Cloud

This skill should be used when the user asks to "configure moon", "set up moonrepo", "create moon tasks", "run moon commands", "configure moon workspace", "add moon project", "moon ci setup", "moon docker", "moon query", "migrate to moon v2", or mentions moon.yml, .moon/workspace.yml, .moon/toolchains.yml, moon run, moon ci, or moonrepo in general.

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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/hyperb1iss/moonrepo-skill --skill moon
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads moon automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

moon - Polyglot Monorepo Build System

moon is a Rust-based repository management, task orchestration, and build system for polyglot monorepos. It provides smart caching, dependency-aware task execution, and unified toolchain management.

moon v2 is now available. Run moon migrate v2 to migrate. See references/v2-migration.md for breaking changes.

When to Use moon

  • Managing monorepos with multiple projects/packages
  • Orchestrating tasks across projects with dependencies
  • Caching build outputs for faster CI/local builds
  • Managing toolchain versions (Node.js, Rust, Python, Go, etc.)
  • Generating project and action graphs

Quick Reference

Core Commands

moon run <target>          # Run task(s)
moon run :lint             # Run in all projects
moon run '#tag:test'       # Run by tag
moon ci                    # CI-optimized execution
moon check --all           # Run all build/test tasks
moon query projects        # List projects
moon project-graph         # Visualize dependencies

Target Syntax

PatternDescription
project:taskSpecific project and task
:taskAll projects with this task
#tag:taskProjects with tag
^:taskUpstream dependencies (in deps)
~:taskCurrent project (in configs)

Configuration Files

FilePurpose
.moon/workspace.ymlWorkspace settings, project discovery
.moon/toolchains.ymlLanguage versions, package managers (v2)
.moon/tasks/*.ymlGlobal inherited tasks (v2)
moon.ymlProject-level config and tasks

v2 Note: .moon/toolchain.yml → .moon/toolchains.yml (plural), .moon/tasks.yml → .moon/tasks/*.yml

Workspace Configuration

# .moon/workspace.yml
$schema: "https://moonrepo.dev/schemas/workspace.json"

projects:
  - "apps/*"
  - "packages/*"

vcs:
  client: "git"
  defaultBranch: "main"

pipeline:
  archivableTargets:
    - ":build"
  cacheLifetime: "7 days"

Project Configuration

# moon.yml
$schema: "https://moonrepo.dev/schemas/project.json"

language: "typescript"
layer: "application" # v2: 'type' renamed to 'layer'
stack: "frontend"
tags: ["react", "graphql"]

dependsOn:
  - "shared-utils"
  - id: "api-client"
    scope: "production"

fileGroups:
  sources:
    - "src/**/*"
  tests:
    - "tests/**/*"

tasks:
  build:
    command: "vite build"
    inputs:
      - "@group(sources)"
    outputs:
      - "dist"
    deps:
      - "^:build"

  dev:
    command: "vite dev"
    preset: "server"

  # v2: Use 'script' for shell features (pipes, redirects)
  lint:
    script: "eslint . && prettier --check ."

  test:
    command: "vitest run"
    inputs:
      - "@group(sources)"
      - "@group(tests)"

Layer Types (v2)

LayerDescription
applicationApps, services
libraryShareable code
toolCLIs, scripts
automationE2E/integration tests
scaffoldingTemplates, generators
configurationInfra, config

Task Configuration

Task Fields

FieldDescription
commandCommand to execute (string or array)
argsAdditional arguments
depsTask dependencies
inputsFiles for cache hashing
outputsFiles to cache
envEnvironment variables
extendsInherit from another task
presetserver or utility

Task Inheritance

Tasks can be inherited globally via .moon/tasks/*.yml:

# .moon/tasks/node.yml
inheritedBy:
  toolchains: ["javascript", "typescript"]

fileGroups:
  sources: ["src/**/*"]

tasks:
  lint:
    command: "eslint ."
    inputs: ["@group(sources)"]

Projects control inheritance:

# moon.yml
workspace:
  inheritedTasks:
    include: ["lint", "test"]
    exclude: ["deploy"]
    rename:
      buildApp: "build"

Task Options

tasks:
  example:
    command: "cmd"
    options:
      cache: true # Enable caching
      runInCI: "affected" # affected, always, only, false
      persistent: true # Long-running process
      retryCount: 2 # Retry on failure
      timeout: 300 # Seconds
      mutex: "resource" # Exclusive lock
      priority: "high" # critical, high, normal, low

Input Tokens

inputs:
  - "@group(sources)" # File group
  - "@globs(tests)" # Glob patterns
  - "/tsconfig.base.json" # Workspace root file
  - "$NODE_ENV" # Environment variable

Toolchain Configuration

# .moon/toolchains.yml (v2: plural)
$schema: "https://moonrepo.dev/schemas/toolchains.json"

# JavaScript ecosystem (v2: required for node/bun/deno)
javascript:
  packageManager: "pnpm"
  inferTasksFromScripts: false

node:
  version: "20.10.0"

pnpm:
  version: "8.12.0"

# Alternative runtimes
bun:
  version: "1.0.0"

deno:
  version: "1.40.0"

typescript:
  syncProjectReferences: true
  routeOutDirToCache: true

rust:
  version: "1.75.0"
  bins: ["cargo-nextest", "cargo-llvm-cov"]

go:
  version: "1.21.0"

python:
  version: "3.12.0"

Toolchain Tiers

TierDescriptionExamples
3Full managementNode.js, Bun, Deno, Rust, Go, Python
2Ecosystem integrationPHP, Ruby
1Project categorizationBash, Batch
0System executionCustom tools

CI Integration

# GitHub Actions
- uses: actions/checkout@v4
  with:
    fetch-depth: 0 # Required for affected detection

- uses: moonrepo/setup-toolchain@v0
  with:
    auto-install: true

- run: moon ci :build :test

- uses: moonrepo/run-report-action@v1
  if: success() || failure()
  with:
    access-token: ${{ secrets.GITHUB_TOKEN }}

Parallelization with Matrix

strategy:
  matrix:
    shard: [0, 1, 2, 3]

steps:
  - run: moon ci --job ${{ matrix.shard }} --job-total 4

Affected Detection

moon run :test --affected             # Only affected projects
moon run :lint --affected --status staged  # Only staged files
moon ci :test --base origin/main      # Compare against base
moon query changed-files              # v2: renamed from touched-files

Docker Support

moon docker scaffold <project>     # Generate Docker layers
moon docker setup                  # Install toolchain in Docker
moon docker prune                  # Prune for production
moon docker file <project>         # Generate Dockerfile

Moon Query Language (MQL)

# Filter projects
moon query projects "language=typescript && projectType=library"
moon run :build --query "tag=react"

# Operators: =, !=, ~, !~, &&, ||
# Fields: project, language, stack, tag, task, taskType

Additional Resources

For detailed configuration options, consult:

  • references/workspace-config.md - Complete workspace.yml reference
  • references/task-config.md - Task configuration and inheritance patterns
  • references/v2-migration.md - v1 to v2 migration guide
  • references/cli-reference.md - Full CLI command reference

Examples

  • examples/workspace.yml - Complete workspace configuration
  • examples/moon.yml - Full project configuration
  • examples/ci-workflow.yml - GitHub Actions CI workflow

FAQ

What does the moon skill do?

This skill should be used when the user asks to "configure moon", "set up moonrepo", "create moon tasks", "run moon commands", "configure moon workspace", "add moon project", "moon ci setup", "moon docker", "moon query", "migrate to moon v2", or mentions moon.yml, .moon/workspace.yml, .moon/toolchains.yml, moon run, moon ci, or moonrepo in general.

How do I install moon?

Run npx skills add https://github.com/hyperb1iss/moonrepo-skill --skill moon in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/moon/ (personal) or .claude/skills/moon/ (project).

Which AI agents can use moon?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is moon safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains moon?

It is published by hyperb1iss in hyperb1iss/moonrepo-skill. It has 80 recorded installs.

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