---

name: project-detection description: Detects project type, package manager, and monorepo structure. Returns correct commands for test/build/lint/dev. Run at project initialization and cache results in state. Use before running any build/test commands.

Project Detection

Detects project configuration and provides standardized commands. Run once at init, cache in state file.

Usage

Run the detection script from the project root:

Copy./marathon-ralph/skills/project-detection/scripts/detect.sh /path/to/project

Returns JSON:

Copy{
  "language": "node",
  "packageManager": "bun",
  "monorepo": {
    "type": "turbo",
    "workspaces": ["apps/web", "apps/api", "packages/shared"]
  },
  "commands": {
    "install": "bun install",
    "dev": "bun run dev",
    "build": "bun run build",
    "test": "bun run test",
    "testWorkspace": "bun run --filter={workspace} test",
    "lint": "bun run lint",
    "typecheck": "bun run check-types"
  }
}

Caching Results

After detection, store in marathon state file under project key:

Copy{
  "project": {
    "language": "node",
    "packageManager": "bun",
    "monorepo": { "type": "turbo", "workspaces": [...] },
    "commands": { ... },
    "detectedAt": "2024-01-03T12:00:00Z"
  }
}

Using Cached Commands

When running commands, always check state first:

1. Read project.commands from state
2. If not present, run detection script
3. Use the appropriate command from the cache

For Monorepos

When tests/builds need to target a specific workspace:

Copy# Use testWorkspace with the workspace name
bun run --filter=web test

# Or for all workspaces
turbo run test

Command Selection Priority

1. Use cached command from state
2. If no cache, run detection
3. If detection fails, fall back to reference patterns

Detection Logic

Package Manager Detection (by lock file)

Monorepo Detection

Language Detection

Python Project Commands

For Python projects:

Note: If [tool.poe.tasks] exists in pyproject.toml, poe commands are preferred.

Reference Files

• node.md - Node.js patterns and commands
• python.md - Python patterns and commands
• monorepo.md - Monorepo-specific patterns