Is the Better Codex skill free?

Yes. The skill itself is free from noobnooc/agent. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Better Codex SkillProof Score?

9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 5/5.

How do I install Better Codex?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Better Codex with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Better Codex

Prompt-only reliability guardrails for agent coding: scope control, root-cause fixes, honest completion.

by noobnooc · noobnooc/agent

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 9.2/10
Tested: Jul 20, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · 50acabf

Cloned the repo (GitHub API was rate-limited); found two skills, tested skills/better-codex/SKILL.md (12.5KB) plus its agents/openai.yaml (display metadata only). Frontmatter parses with name+description, body references no external files/scripts, and a security grep for curl/base64/eval/tokens/install-scripts came back empty — fully self-contained. Baseline vs skill on a config-parser task showed the skill produced correct split("=",1) + whitespace + error handling with real tests where the baseline silently broke on values containing "=".

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 8/10
Docs & honesty 5/5

What Better Codex does

A pure-prompt behavioral overlay that codifies common Codex complaints into rules: stay in scope, re-read before editing, fix root causes over patches, implement the whole class of cases, pick dependencies wisely, keep reasoning out of code artifacts, and report tersely. Loads whenever an agent is asked to implement, modify, debug, review, or test a codebase. No tooling, scripts, or external calls — it just reshapes how the agent behaves during coding work.

How to install Better Codex

Clone the repo and copy the folder into your agent's skills dir: `git clone https://github.com/noobnooc/agent.git && mkdir -p ~/.codex/skills && cp -R agent/skills/better-codex ~/.codex/skills/`. Pure prompt skill — no dependencies, no build step. Written for Codex (`~/.codex/skills`) but the rules are agent-agnostic; copy into any agent's skills directory.

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Better Codex

/better-codex Prompt-only reliability guardrails for agent coding: scope control, root-cause fixes, honest completion.

It also activates on plain-language prompts like these:

Review this fix for scope creep before merging
Check whether this debugging was actually thorough
Avoid one-off special-case code in this patch

Frequently asked questions

Is the Better Codex skill free?: Yes. The skill itself is free from noobnooc/agent. SkillProof publishes the install command and an independent test verdict at no cost.
Does Better Codex work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 20, 2026. Verdict: Tested · Works. Cloned the repo (GitHub API was rate-limited); found two skills, tested skills/better-codex/SKILL.md (12.5KB) plus its agents/openai.yaml (display metadata only). Frontmatter parses with name+description, body references no external files/scripts, and a security grep for curl/base64/eval/tokens/install-scripts came back empty — fully self-contained. Baseline vs skill on a config-parser task showed the skill produced correct split("=",1) + whitespace + error handling with real tests where the baseline silently broke on values containing "=".
What is the Better Codex SkillProof Score?: 9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 5/5.
How do I install Better Codex?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Better Codex with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.