Advanced context engineering techniques and patterns for Claude Code, OpenCode, Cursor, Antigravity and more.

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Context Engineering Kit

A hand-crafted collection of advanced context engineering techniques and patterns with minimal token footprint, focused on improving agent result quality and predictability.

The marketplace is based on prompts our company's developers have used daily for a long time, supplemented by plugins from benchmarked papers and high-quality projects.

Key Features

• Simple to Use - Easy to install and use without any dependencies. Contains automatically used skills and self-explanatory commands.
• Token-Efficient - Carefully crafted prompts and architecture, preferring command-oriented skills with sub-agents over general information skills when possible, to minimize populating context with unnecessary information.
• Quality-Focused - Each plugin is focused on meaningfully improving agent results in a specific area.
• Granular - Install only the plugins you need. Each plugin loads only its specific agents, commands, and skills, without overlap or redundant skills.
• Scientifically proven - Plugins are based on proven techniques and patterns validated by reputable benchmarks and studies.
• Open-Standards - Skills are based on agentskills.io specification. The SDD plugin is based on the Arc42 specification standard for software development documentation.

News

Updates from key releases:

• v3.1.0: Improved Spec-Driven Development plugin generated code quality by embedding DDD/SOLID rules in the developer agent and adding a dedicated code-reviewer agent that applies functional and OOP best-practices rules together with Muda waste analysis to reduce code complexity and duplication.
• v3.0.0: Added support for AMP and Hermes agents. Tech Stack plugin now automatically injects typescript best practices when agent reads or writes TypeScript files.
• v2.2.0: Subagent-Driven Development plugin now works as a distilled version of SDD plugin using meta-judge and judge sub-agents for specification generation on the fly and in parallel to implementation. DDD plugin now includes Clean Architecture, DDD, SOLID, Functional Programming, and other pattern examples as rules that are automatically added to the context during code writing.
• v2.1.0: Spec-Driven Development plugin agents include high-level code quality guidelines from DDD plugin.
• v2.0.0: Spec-Driven Development plugin was rewritten from scratch. It is now able to produce working code in 99% of cases on real-life production projects!

Quick Start

Step 1: Install Marketplace and Plugins

Claude Code

Open Claude Code and add the Context Engineering Kit marketplace:

/plugin marketplace add NeoLabHQ/context-engineering-kit

This makes all plugins available for installation, but does not load any agents or skills into your context.

Install any plugin — for example, reflexion:

/plugin install reflexion@NeoLabHQ/context-engineering-kit

Each installed plugin loads only its specific agents, commands, and skills into Claude's context.

Gemini CLI

Install the extension directly from the repository:

gemini extensions install https://github.com/NeoLabHQ/context-engineering-kit

Note: This installs every plugin's skills and agents as a single bundle — there's no per-plugin selection like Claude Code's. Unfortunately, Gemini CLI does not support per-plugin selection. But you can delete skills and agents that you don't need, after installation.

Antigravity CLI

Install the plugin directly from the repository's antigravity/ folder — Gemini CLI is not required:

agy plugin install https://github.com/NeoLabHQ/context-engineering-kit/antigravity

Note: This installs every plugin's skills and agents as a single bundle — there's no per-plugin selection like Claude Code's. Unfortunately, Antigravity CLI does not support per-plugin selection. But you can delete skills and agents that you don't need, after installation.

Cursor, Codex, OpenCode and others

Run the vercel-labs/skills command in your terminal:

npx skills add NeoLabHQ/context-engineering-kit

You can pick which skills to install.

Note: Each provider uses its own agent format and npx skills does not support subagents, so this installation method won't provide the full experience.

Alternative installation methods

You can use OpenSkills to install skills by running the following commands:

npx openskills install NeoLabHQ/context-engineering-kit
npx openskills sync

Step 2: Use Plugin

> claude "implement user authentication"
# Claude implements user authentication, then you can ask it to reflect on implementation

> /reflect
# It analyses results and suggests improvements
# If issues are obvious, it will fix them immediately
# If they are minor, it will suggest improvements that you can respond to
> fix the issues

# If you would like to prevent issues found during reflection from appearing again,
# ask Claude to extract resolution strategies and save the insights to project memory
> /memorize

Alternatively, you can use the reflect wor