Devcontainer Diagnostic Diagnose devcontainer and Docker development environment problems. Help create reproducible, fast-starting development environments that work consistently across VS Code, GitHub Codespaces, and team members. When to Use This Skill Use this skill when: - Setting up a new devcontainer - Container startup is too slow - Configuration errors or conflicts - Different behavior in VS Code vs Codespaces - Multi-service development environment needed Do NOT use this skill when: - Writing application code - Deploying to production - Configuring CI/CD pipelines Core Principle Deve…