claude-codex-settings is a collection of configurations and reusable extensions for Claude Code, OpenAI Codex, Cursor, and related coding tools. Developers use its skills, commands, hooks, agents, plugins, and MCP servers to shape coding-agent workflows and connect alternative model APIs. The catalogue entries are components of this collection that can be installed into supported coding tools.
Borrowing it
Nothing to install: this file belongs to fcakyon/claude-codex-settings. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/fcakyon/claude-codex-settings/main/CLAUDE.mdgit clone --depth 1 https://github.com/fcakyon/claude-codex-settingsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/fcakyon/claude-codex-settings/claude-md)<a href="https://agentmods.dev/instructions/fcakyon/claude-codex-settings/claude-md"><img src="https://agentmods.dev/badge/instructions/fcakyon/claude-codex-settings/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/fcakyon/claude-codex-settings/claude-md"><img src="https://agentmods.dev/badge/instructions/fcakyon/claude-codex-settings/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.05213 | $0.05213 |
| Opus 5.5 | $0.02085 | $0.02085 |
| Sonnet 5.5 | $0.01043 | $0.01043 |
| Haiku 4.5 | $0.00521 | $0.00521 |
Grade A, and why
claude-codex-settings CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 461 lines — stays where its author put it; the contents beside it link to each section on GitHub.
claude-settings
AGENTS.mdandGEMINI.mdare symlinks to this file for Codex CLI and Gemini CLI compatibility.
Multi-tool plugin marketplace. Each plugin under plugins/ is independently installable on Claude Code, Codex CLI, Gemini CLI, and Cursor.
Repo Structure
claude-settings/
CLAUDE.md # this file (repo dev guide)
AGENTS.md -> CLAUDE.md # Codex CLI reads this
GEMINI.md -> CLAUDE.md # Gemini CLI reads this
.claude/CLAUDE.md # user-facing global config (synced to ~/.claude/CLAUDE.md)
.claude/settings.json # Claude Code settings
.claude-plugin/marketplace.json # Claude Code marketplace
.agents/plugins/marketplace.json # Codex CLI marketplace
.cursor-plugin/marketplace.json # Cursor marketplace
.codex/config.toml # Codex CLI config
.github/scripts/ # repo maintenance scripts
_helpers.sh # shared sync/zip functions
sync-<vendor>-skills.sh # per-vendor skill sync
sync-versions.sh # version alignment
release.sh # GitHub release creation
validate_plugins.py # CI plugin validation
plugins/
<name>/
.claude-plugin/plugin.json # Claude Code manifest
.codex-plugin/plugin.json # Codex CLI manifest
.cursor-plugin/plugin.json # Cursor manifest
gemini-extension.json # Gemini CLI manifest
skills/<skill>/SKILL.md # universal across all tools
agents/<agent>.md # Claude Code + Gemini + Cursor
hooks/hooks.json + scripts/ # Claude Code + Codex CLI + Gemini
commands/<cmd>.md # Claude Code only
output-styles/<style>.md # Claude Code only
Cross-Tool Plugin Format Reference
Plugin Manifests
Each plugin has 4 manifest files. Claude Code manifest is the source of truth; others are copies or subsets.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- today Changed · +3 lines · +66 tokens per session 6dade45c0f0f
- 3d ago Changed · +7 lines · +146 tokens per session 412619b8033d
- 12d ago Changed · +31 tokens per session febe6d9ca80a
- 26d ago Changed · +1 lines · +13 tokens per session dfe47637b52c
- 1mo ago Changed · +1 lines · +13 tokens per session 9c6a858a2f61
- 1mo ago First seen · 449 lines · 4,944 tokens per session scan A d2c7c5176645
claude-codex-settings CLAUDE.md is an instructions file published in the GitHub repository fcakyon/claude-codex-settings (1,189 stars, last pushed today), licensed Apache-2.0. It adds 5,213 tokens to every session, about $0.0209 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.