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Cogni-AI-OU
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devcontainer

Create reproducible devcontainer.json configurations with pinned Features and lifecycle scripts.

3|1|Updated Apr 12, 2026
Search Tags:#vscode#reproducibility#devcontainer#codespaces#lifecycle scripts#feature-based docker
One-click install
npx skills add https://github.com/Cogni-AI-OU/cogni-ai-agent-skills --skill devcontainer-cogni-ai-ou
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: devcontainer
Source: https://github.com/Cogni-AI-OU/cogni-ai-agent-skills/tree/main/devcontainer
Command: npx skills add https://github.com/Cogni-AI-OU/cogni-ai-agent-skills --skill devcontainer-cogni-ai-ou

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill removes inconsistent, fragile, and hard-to-reproduce development environments by guiding you to define secure, version-pinned devcontainer.json setups with dependable lifecycle behavior.

Core Features & Use Cases

  • Reproducible Environment Setup: Pin base image tags and Dev Container Feature versions to avoid “it works on my machine” drift.
  • Correct Lifecycle Hook Usage: Separate onCreateCommand, updateContentCommand, and postCreateCommand so OS-level work happens at the right time and project dependencies run only when the workspace is ready.
  • Secure, Practical Customization: Configure remoteUser, VS Code extensions, and settings, and prefer Features over monolithic Dockerfiles.
  • Use Case: When onboarding contributors to a Python/Node repo, create a consistent devcontainer that installs OS tools and then installs project dependencies reliably for every developer and Codespaces session.

Quick Start

Use the devcontainer skill to generate a robust .devcontainer/devcontainer.json for a project by specifying your base image, required Features, remoteUser, and the commands that should run in onCreateCommand, updateContentCommand, and postCreateCommand.

Frequently Asked Questions about devcontainer

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I create a reproducible devcontainer.json configuration for VS Code and Codespaces?▼

Lifecycle scripts in devcontainers separate container creation, workspace mounting, and dependency installation. Use onCreateCommand for OS-level setup, updateContentCommand for workspace updates, and postCreateCommand for project dependencies.

What's the best way to separate onCreateCommand, updateContentCommand, and postCreateCommand in devcontainers?▼

Separate lifecycle scripts by running OS-level work in onCreateCommand, workspace updates in updateContentCommand, and project dependencies in postCreateCommand to ensure dependencies install only when the workspace is fully ready.

Why should I use Dev Container Features instead of a monolithic Dockerfile?▼

Using Features instead of a monolithic Dockerfile allows version-pinned, modular toolchain additions. This prevents environment drift and ensures secure, consistent setups across VS Code and Codespaces environments.

How do I configure remoteUser securely when setting up a devcontainer?▼

Configure remoteUser to securely separate root execution for OS-level container creation from remoteUser execution for post-creation dependency installation, ensuring safe and consistent development environments.

Does this devcontainer setup work for onboarding contributors to a Python or Node repository?▼

Yes, this devcontainer setup onboards contributors to Python or Node repos by creating consistent environments that reliably install OS tools and project dependencies for every developer and Codespaces session.

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