claude-codex-settings

Battle-tested Claude Code, Claude Desktop, OpenAI Codex, Cursor, and Antigravity CLI setup with skills, commands, hooks, subagents, and MCP servers, plus Kimi, MiniMax, and GLM API support.

"They make wrong assumptions on your behalf and just run along with them without checking. They don't manage their confusion, they don't seek clarifications, they don't surface inconsistencies, they don't present tradeoffs. They really like to overcomplicate code and APIs, they bloat abstractions, they don't clean up dead code after themselves." -- Andrej Karpathy

This repo's guidelines are structured to fix exactly these pitfalls.

Installation • Plugins • Configuration • References

Claude Settings has setup guides and skill downloads. Agent Plugins is the compact plugin directory.

Installation

Plugins add skills, commands, and automations to your AI coding tool. Install only what you need from the plugin list below.

Prerequisites: See INSTALL.md for setup requirements.

Claude Code

# Add marketplace (one time)
claude plugin marketplace add fcakyon/claude-codex-settings

# Install any plugin by name
claude plugin install fable-advisor@claude-settings

In Claude Code desktop, select + beside the prompt, then Plugins and Add plugin.

Codex CLI

# Add marketplace (one time)
codex plugin marketplace add fcakyon/claude-codex-settings

# Install any plugin by name
codex plugin add simplify@claude-settings

In the Codex desktop app, open Plugins, find the plugin, and select Install.

Antigravity CLI

git clone https://github.com/fcakyon/claude-codex-settings.git
cd claude-codex-settings
uv run .github/scripts/antigravity.py install simplify

Requires Antigravity CLI and uv. The installer packages skills and MCP servers for Antigravity, keeps long instructions in full, and installs them with agy plugin install. Claude-specific hooks, agents, commands, and output styles stay with their original tools. Add more plugin names to install several at once.

Cursor

# Add marketplace (one time)
cursor-agent plugin marketplace add https://github.com/fcakyon/claude-codex-settings

# Start the interactive CLI
cursor-agent

Enter /plugin, open the marketplace, and install the plugin at user or project scope. In the Cursor app, open Customize and select Install.

Want the shared agent guidance too? .claude/CLAUDE.md is the file written for your projects. Run /claude-tools:sync-claude-md to pull it into ~/.claude/CLAUDE.md, or paste it into a project as CLAUDE.md, then point the other tools at the same file:

ln -sfn CLAUDE.md AGENTS.md # Codex, Cursor, Antigravity, Copilot

Plugins

simplify - Review changed code for reuse, redundancy, and over-engineering, then apply fixes

Claude Code	Codex CLI	Antigravity CLI
claude plugin install simplify@claude-settings	codex plugin add simplify@claude-settings	uv run .github/scripts/antigravity.py install simplify

Run /simplify to review your staged or committed diff across four angles (reuse, simplification, efficiency, altitude) with parallel agents, then apply the cleanups. It reviews changed-code quality, not correctness bugs. It brings Claude Code's built-in /simplify to Codex, Cursor, and Antigravity, which don't ship it natively, so all three get the same review and apply flow.

Skills:

• simplify - review the changed diff across four angles and apply the fixes

Hooks:

• guard.py - Require a completed /simplify run before each Claude Code or Codex commit, unless you explicitly ask to skip it for one commit

humanize - Write naturally and block AI buzzwords in files, commits, and messages

Claude Code	Codex CLI	Antigravity CLI
claude plugin install humanize@claude-settings	codex plugin add humanize@claude-settings	uv run .github/scripts/antigravity.py install humanize

Before a Write or Edit saves, humanize scans the new text and blocks whatever reads like a machine wrote it, each hit paired with a plain-word swap. It reads Markdown files whole and checks comments and docstrings in code files while skipping source code and recognized code-shaped references:

• 3 marks: the em-dash, section sign, and stray semicolon (the en-dash stays)
• 53 stock words like leverage, seamlessly, vibrant, game-changing, each mapped to a plain swap
• 16 openers and cliches like in conclusion, a testament to, aims to bridge
• 10 pile-up words like crucial or significant, flagged at 3+ uses in one write

The hook runs on Claude Code and Codex; Antigravity receives the writing skill. Unlike a markdown rule the model can ignore, the hook checks every Write or Edit and blocks each match until it is replaced. The word list draws on Wikipedia's "Signs of AI writing".

Skills (ZIP for claude.ai, ChatGPT, Claude Code, Cursor, Codex, VS Code):

Skill	Description	ZIP
humanize	Avoid common AI writing patterns with examples

Hooks:

• humanize.py - blocks matched marks, buzzwords, and cliches before a Write or Edit lands

fable-advisor - Get a second opinion from Claude Fable 5.1 before big decisions

Claude Code	Codex CLI	Antigravity CLI
claude plugin install fable-advisor@claude-settings	codex plugin add fable-advisor@claude-settings	uv run .github/scripts/antigravity.py install fable-advisor

Ask a Fable 5.1 reviewer to challenge a plan or conclusion before you commit. Claude Code uses the native plugin agent, while Codex, Cursor, and Antigravity call the same model through an authenticated Claude Code CLI with claude -p --model claude-fable-5-1.

Agents:

• fable-advisor - Native Claude Code reviewer with recent conversation context

Skills:

• fable-advisor - Routes Claude Code to its native agent and other tools to claude -p

codex-advisor - Get a second opinion from GPT-6 Astra via Codex CLI before big decisions

Claude Code	Codex CLI	Antigravity CLI
claude plugin install codex-advisor@claude-settings	codex plugin add codex-advisor@claude-settings	uv run .github/scripts/antigravity.py install codex-advisor

Ask GPT-6 Astra to challenge a plan before you build it, the cross-model check the built-in advisor cannot give you. Claude Code attaches the recent conversation, so "ask the codex advisor" is enough. Codex, Cursor, and Antigravity reach the same reviewer. Needs the Codex CLI signed in.

Agents:

• codex-advisor - Sends the recent conversation to GPT-6 Astra and returns the verdict verbatim

Skills:

• codex-advisor - Routes Claude Code to its native agent and other tools to codex exec

adhd-output-style - Use fewer output tokens with short steps, quick insights, and clear next actions

| Claude Code | Codex CLI | Antigravity CLI |