Agent skill

Codex Advisor

by fcakyon in fcakyon/claude-codex-settings

This skill should be used when the user asks for a "GPT second opinion", wants a "cross-model review", needs to "check a plan before committing", wants another view after repeated failures, or…

Apache-2.0Auto-check passed

Install Codex Advisor

skills CLI

$ npx skills add fcakyon/claude-codex-settings --skill codex-advisor -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install fcakyon/claude-codex-settings codex-advisor --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/fcakyon/claude-codex-settings.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/codex-advisor/skills/codex-advisor .claude/skills/codex-advisor && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "codex-advisor" agent skill from https://github.com/fcakyon/claude-codex-settings/tree/main/plugins/codex-advisor/skills/codex-advisor into .claude/skills/codex-advisor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codex-advisor", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/fcakyon/claude-codex-settings/tree/main/plugins/codex-advisor/skills/codex-advisor

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add fcakyon/claude-codex-settings --skill codex-advisor -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install fcakyon/claude-codex-settings codex-advisor --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/fcakyon/claude-codex-settings.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/codex-advisor/skills/codex-advisor .agents/skills/codex-advisor && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "codex-advisor" agent skill from https://github.com/fcakyon/claude-codex-settings/tree/main/plugins/codex-advisor/skills/codex-advisor into .agents/skills/codex-advisor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codex-advisor", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add fcakyon/claude-codex-settings --skill codex-advisor -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install fcakyon/claude-codex-settings codex-advisor --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/fcakyon/claude-codex-settings.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/codex-advisor/skills/codex-advisor .cursor/skills/codex-advisor && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "codex-advisor" agent skill from https://github.com/fcakyon/claude-codex-settings/tree/main/plugins/codex-advisor/skills/codex-advisor into .cursor/skills/codex-advisor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codex-advisor", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/fcakyon/claude-codex-settings.git --path plugins/codex-advisor/skills/codex-advisor

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add fcakyon/claude-codex-settings --skill codex-advisor -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install fcakyon/claude-codex-settings codex-advisor --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/fcakyon/claude-codex-settings.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/codex-advisor/skills/codex-advisor .gemini/skills/codex-advisor && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "codex-advisor" agent skill from https://github.com/fcakyon/claude-codex-settings/tree/main/plugins/codex-advisor/skills/codex-advisor into .gemini/skills/codex-advisor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codex-advisor", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install fcakyon/claude-codex-settings codex-advisor

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add fcakyon/claude-codex-settings --skill codex-advisor -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/fcakyon/claude-codex-settings.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/codex-advisor/skills/codex-advisor .github/skills/codex-advisor && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "codex-advisor" agent skill from https://github.com/fcakyon/claude-codex-settings/tree/main/plugins/codex-advisor/skills/codex-advisor into .github/skills/codex-advisor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codex-advisor", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add fcakyon/claude-codex-settings --skill codex-advisor -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install fcakyon/claude-codex-settings codex-advisor --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/fcakyon/claude-codex-settings.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/codex-advisor/skills/codex-advisor .opencode/skills/codex-advisor && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "codex-advisor" agent skill from https://github.com/fcakyon/claude-codex-settings/tree/main/plugins/codex-advisor/skills/codex-advisor into .opencode/skills/codex-advisor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codex-advisor", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: codex-advisor
GitHub stars: 1.2k
Token cost: ~349 tokens
SKILL.md length: 162 words
Files: 3 (incl. scripts)
Skills in repo: 43
Repo updated: Oct 6, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

This skill should be used when the user asks for a "GPT second opinion", wants a "cross-model review", needs to "check a plan before committing", wants another view after repeated failures, or…

Works in 2 steps: In Claude Code, delegate to the native… → Elsewhere, run this exact shape from…
Asks for a GPT second opinion
SKILL.md covers Route by tool, Reviewer and Weighing the answer
Runs JavaScript scripts from its folder; calls node

What it does

Codex Advisor is an agent skill from fcakyon/claude-codex-settings. This skill should be used when the user asks for a "GPT second opinion", wants a "cross-model review", needs to "check a plan before committing", wants another view after repeated failures, or explicitly invokes "codex-advisor".

Its SKILL.md is about 350 tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including scripts (for example `reviewer-prompt.md`).

The repository describes itself as: Battle-tested Claude Code, OpenAI Codex, Cursor configs, plugins, hooks and agents with Kimi, MiniMax and GLM API support. The licence is Apache-2.0.

When your agent uses it

Asks for a GPT second opinion
Wants a cross-model review
Needs to check a plan before committing
Wants another view after repeated failures

Example prompts

“GPT second opinion”
“cross-model review”
“check a plan before committing”
“/codex-advisor”

Requirements

Node.js

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

In Claude Code, delegate to the native codex-advisor agent. It receives the
Elsewhere, run this exact shape from this skill's directory so the request

What it can do on your machine

Read from SKILL.md and the folder at commit a035b4e. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (JavaScript), which the agent can run.
Shell commands in SKILL.md call:
- node
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Codex Advisor loads about 349 tokens when it runs. Until then it costs about 61 tokens; SKILL.md has 162 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~61
When it runs · the whole SKILL.md, loaded when a task matches: ~349

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from fcakyon/claude-codex-settings at commit a035b4e, republished under its Apache-2.0 licence (© fcakyon). 162 words, ~349 tokens.

Download SKILL.mdSave it as .claude/skills/codex-advisor/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.

name: codex-advisor
description: This skill should be used when the user asks for a "GPT second opinion", wants a "cross-model review", needs to "check a plan before committing", wants another view after repeated failures, or explicitly invokes "codex-advisor".

Codex Advisor

Get a focused second opinion from GPT-6 Astra through the Codex CLI, without handing the work over to it.

Route by tool

In Claude Code, delegate to the native codex-advisor agent. It receives the recent conversation automatically, so do not paste the history yourself.
Elsewhere, run this exact shape from this skill's directory so the request reaches standard input:
```
node scripts/ask_codex.mjs <<'REVIEW'
the review request
REVIEW
```

State the decision, the evidence behind it, and any constraint that changes the verdict. Name the paths that matter: the reviewer has read-only access and checks load-bearing claims itself.

Return the answer without rewriting it. If codex is missing or unauthenticated, surface the error and ask the user to install it or sign in. Never review in its place.

Reviewer

Pinned to gpt-6-astra at medium reasoning effort.

Weighing the answer

Give the verdict serious weight. If a step it recommends fails when tried, or a file contradicts a specific claim, surface the conflict instead of following the review blindly.

Files

SKILL.md and 2 other files (scripts) in plugins/codex-advisor/skills/codex-advisor of fcakyon/claude-codex-settings.

SKILL.md
reviewer-prompt.md
scripts/ask_codex.mjs

Open the folder on GitHubat commit a035b4e

Compare with similar skills

Codex Advisor next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Codex Advisor compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Codex Advisor this skillfcakyon/claude-codex-settings	1.2k	—	~349	Automated safety check: Pass	Apache-2.0	yesterday
Advisor Modecursor/plugins	10k	—	~2.6k	Automated safety check: Notes	None	today
Odoo Upgrade Advisorsickn33/agentic-awesome-skills	47k	2 repos	~1.3k	Automated safety check: Pass	MIT	yesterday
Gpt Proudecode/plate	17k	—	~1.7k	Automated safety check: Pass	Custom licence	today
Token Budget Advisoraffaan-m/ECC	274k	—	~910	Automated safety check: Pass	MIT	2 days ago
Token Budget Advisoraffaan-m/ECC	274k	—	~927	Automated safety check: Pass	MIT	2 days ago

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Questions about Codex Advisor

What does Codex Advisor do?

This skill should be used when the user asks for a "GPT second opinion", wants a "cross-model review", needs to "check a plan before committing", wants another view after repeated failures, or…. Codex Advisor is an agent skill from fcakyon/claude-codex-settings. This skill should be used when the user asks for a "GPT second opinion", wants a "cross-model review", needs to "check a plan before committing", wants another view after repeated failures, or explicitly invokes "codex-advisor".

When should I use Codex Advisor?

Codex Advisor fits situations like: asks for a GPT second opinion; wants a cross-model review; needs to check a plan before committing; wants another view after repeated failures.

How do I install Codex Advisor in Claude Code?

Run `npx skills add fcakyon/claude-codex-settings --skill codex-advisor -a claude-code`. Or copy the skill folder (plugins/codex-advisor/skills/codex-advisor in fcakyon/claude-codex-settings) into .claude/skills/codex-advisor in your project. Claude Code loads it when a task matches its description.

How do I install Codex Advisor in Codex?

Run `npx skills add fcakyon/claude-codex-settings --skill codex-advisor -a codex`. Or copy the skill folder (plugins/codex-advisor/skills/codex-advisor in fcakyon/claude-codex-settings) into .agents/skills/codex-advisor in your project. Codex loads it when a task matches its description.

Can I use Codex Advisor in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add fcakyon/claude-codex-settings --skill codex-advisor -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/codex-advisor, .gemini/skills/codex-advisor, .github/skills/codex-advisor and .opencode/skills/codex-advisor in your project.

What does Codex Advisor need to run?

Going by SKILL.md and its folder, Codex Advisor needs JavaScript for the scripts in its folder and the command-line tools its instructions call (node). Our summary lists: Node.js.

Does Codex Advisor access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Codex Advisor safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Codex Advisor use?

Codex Advisor is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Codex Advisor use?

About 349 tokens (SKILL.md is roughly 1.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Codex Advisor?

Skills that share tags, products or a category with Codex Advisor: Advisor Mode (cursor/plugins, 10k stars), Odoo Upgrade Advisor (sickn33/agentic-awesome-skills, 47k stars), Gpt Pro (udecode/plate, 17k stars) and Token Budget Advisor (affaan-m/ECC, 274k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Codex Advisor?

fcakyon (a GitHub user) maintains it in fcakyon/claude-codex-settings, which has 1,163 GitHub stars. The repository holds 43 skills in this directory. The repository was last updated on October 6, 2026.

Source: fcakyon/claude-codex-settings on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Codex Advisor

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Codex Advisor

Route by tool

Reviewer

Weighing the answer

Files

Compare with similar skills

Similar skills

More from fcakyon/claude-codex-settings

Questions about Codex Advisor