Coding Agents Guide

Set up SkillX with your favorite AI coding agent in 3 steps.

Quick Start

1. Install the SkillX skill

For Claude Code, run this in your project directory:

$npx skills add nextlevelbuilder/skillx/skillx

For other agents, see the agent-specific setup below.

2. Get your API key

Generate a free API key from your SkillX settings page.

Get API Key →

3. Add your API key

Create a .env file in the skill directory with your key.

$echo 'SKILLX_API_KEY=sk_your_key_here' > .claude/skillx/.env

Adjust the path for your agent (see table below).

That's it! The SkillX skill will be invoked automatically during your coding sessions, giving your agent access to 133K+ skills from the marketplace.

Agent-Specific Setup

Claude Code

docs →

Install

$npx skills add nextlevelbuilder/skillx/skillx

API Key Location

.claude/skillx/.env

The skill auto-activates on every task via SKILL.md instructions.

Codex (OpenAI)

docs →

Manual Setup

  1. Create an AGENTS.md file in your project root (or ~/.codex/)
  2. Add a reference to SkillX: include the skill content from skillx.sh

API Key Location

.codex/.env

Codex reads AGENTS.md for custom instructions at startup.

Gemini CLI

docs →

Manual Setup

  1. Create .gemini/skills/skillx/ directory in your project
  2. Add SKILL.md with the skill content from skillx.sh

API Key Location

.gemini/skillx/.env

Gemini CLI loads skills from .gemini/skills/ automatically.

Cursor

docs →

Manual Setup

  1. Open Cursor Settings > Rules
  2. Add a new project rule (.cursor/rules/skillx.mdc)
  3. Paste the skill content from skillx.sh

API Key Location

.cursor/.env

Cursor loads .mdc rule files from .cursor/rules/ on startup.

Amp

docs →

Manual Setup

  1. Create .amp/skills/skillx/ directory in your project
  2. Add SKILL.md with the skill content from skillx.sh

API Key Location

.amp/skillx/.env

Amp reads skill files from .amp/skills/ directory.

Windsurf

docs →

Manual Setup

  1. Create .windsurf/rules/skillx.md in your project
  2. Paste the skill content from skillx.sh

API Key Location

.windsurf/.env

Windsurf loads rules from .windsurf/rules/ on startup.