Open Code Review CLI
alibaba/open-code-review
Runs the ocr command-line tool to review Git changes, a commit or a branch comparison with an AI model, returning line-level comments and optionally applying fixes.
Invoke external AI CLIs (Codex, Gemini) for second opinions, code reviews, or alternative analysis.
Install External Agents
$ npx skills add kylesnowschwartz/SimpleClaude --skill external-agents -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install kylesnowschwartz/SimpleClaude external-agents --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/kylesnowschwartz/SimpleClaude.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/sc-skills/skills/external-agents .claude/skills/external-agents && rm -rf skills-srcUse ~/.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/
Install the "external-agents" agent skill from https://github.com/kylesnowschwartz/SimpleClaude/tree/main/plugins/sc-skills/skills/external-agents into .claude/skills/external-agents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "external-agents", 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 install https://github.com/kylesnowschwartz/SimpleClaude/tree/main/plugins/sc-skills/skills/external-agentsType 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.
$ npx skills add kylesnowschwartz/SimpleClaude --skill external-agents -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install kylesnowschwartz/SimpleClaude external-agents --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kylesnowschwartz/SimpleClaude.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/sc-skills/skills/external-agents .agents/skills/external-agents && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "external-agents" agent skill from https://github.com/kylesnowschwartz/SimpleClaude/tree/main/plugins/sc-skills/skills/external-agents into .agents/skills/external-agents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "external-agents", 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.
$ npx skills add kylesnowschwartz/SimpleClaude --skill external-agents -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install kylesnowschwartz/SimpleClaude external-agents --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kylesnowschwartz/SimpleClaude.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/sc-skills/skills/external-agents .cursor/skills/external-agents && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "external-agents" agent skill from https://github.com/kylesnowschwartz/SimpleClaude/tree/main/plugins/sc-skills/skills/external-agents into .cursor/skills/external-agents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "external-agents", 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 https://github.com/kylesnowschwartz/SimpleClaude.git --path plugins/sc-skills/skills/external-agents--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add kylesnowschwartz/SimpleClaude --skill external-agents -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install kylesnowschwartz/SimpleClaude external-agents --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kylesnowschwartz/SimpleClaude.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/sc-skills/skills/external-agents .gemini/skills/external-agents && rm -rf skills-srcUse ~/.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/
Install the "external-agents" agent skill from https://github.com/kylesnowschwartz/SimpleClaude/tree/main/plugins/sc-skills/skills/external-agents into .gemini/skills/external-agents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "external-agents", 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.
$ gh skill install kylesnowschwartz/SimpleClaude external-agentsInstalls 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).
$ npx skills add kylesnowschwartz/SimpleClaude --skill external-agents -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/kylesnowschwartz/SimpleClaude.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/sc-skills/skills/external-agents .github/skills/external-agents && rm -rf skills-srcUse ~/.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/
Install the "external-agents" agent skill from https://github.com/kylesnowschwartz/SimpleClaude/tree/main/plugins/sc-skills/skills/external-agents into .github/skills/external-agents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "external-agents", 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.
$ npx skills add kylesnowschwartz/SimpleClaude --skill external-agents -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install kylesnowschwartz/SimpleClaude external-agents --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kylesnowschwartz/SimpleClaude.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/sc-skills/skills/external-agents .opencode/skills/external-agents && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "external-agents" agent skill from https://github.com/kylesnowschwartz/SimpleClaude/tree/main/plugins/sc-skills/skills/external-agents into .opencode/skills/external-agents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "external-agents", 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
external-agents- GitHub stars
- 114
- Token cost
- ~3.2k tokens
- SKILL.md length
- 1,028 words
- Files
- 1
- Skills in repo
- 12
- Repo updated
- First seen
- Licence
- None found
At a glance
Invoke external AI CLIs (Codex, Gemini) for second opinions, code reviews, or alternative analysis.
- Works in 2 steps: Run CLIs directly via Bash (with… → Do NOT pipe stdin into codex exec —…
- Asks for a second opinion
- SKILL.md covers Critical Rules, Prerequisites, When to Use and Recommended Models, plus 5 more sections
- Calls codex, gemini and git; needs GEMINI_API_KEY
What it does
External Agents is an agent skill from kylesnowschwartz/SimpleClaude. Invoke external AI CLIs (Codex, Gemini) for second opinions, code reviews, or alternative analysis. This skill SHOULD be used when the user asks for a "second opinion", "outside review", says "ask codex", "ask gemini", "run codex", "run gemini", "get another AI's take", or needs verification from a different model.
Its SKILL.md is about 3.2k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development, covering Code review. It works with OpenAI. The repository describes itself as: Practical minimalism for AI assisted programming with Claude Code.
When your agent uses it
- Asks for a second opinion
- Get another AIs take
- Needs verification from a different model
Example prompts
- “second opinion”
- “outside review”
- “ask codex”
- “/external-agents”
Requirements
- Node.js
- A credential in GEMINI_API_KEY
Workflow steps
2 steps, taken from the first numbered list in SKILL.md.
- Run CLIs directly via Bash (with run_in_background: true for async). Subagents cannot approve Bash permissions interactively — the command…
- Do NOT pipe stdin into codex exec — codex ignores stdin entirely. Save content to a file (e.g., /tmp/review-diff.txt) and tell codex to…
What it can do on your machine
Read from SKILL.md and the folder at commit a98f931. 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
Shell commands in SKILL.md call:
codexgeminigitnodenpmbrew
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
github.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
GEMINI_API_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
External Agents loads about 3.2k tokens when it runs. Until then it costs about 83 tokens; SKILL.md has 1,028 words of instructions outside code blocks.
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); files beside SKILL.md are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 1,028 words (~3,160 tokens).
“Run OpenAI Codex CLI or Google Gemini CLI for second opinions and external reviews.”
- name
- external-agents
Files
Just SKILL.md in plugins/sc-skills/skills/external-agents of kylesnowschwartz/SimpleClaude.
Open the folder on GitHubat commit a98f931
Compare with similar skills
External Agents 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| External Agents this skillkylesnowschwartz/SimpleClaude | 114 | — | ~3.2k | Automated safety check: Pass | None | |
| Open Code Review CLIalibaba/open-code-review | 45k | — | ~3.1k | Automated safety check: Pass | Apache-2.0 | |
| Deep Reviewdyad-sh/dyad | 22k | — | ~1.4k | Automated safety check: Pass | Custom licence | |
| Coding Protocollencx/skills | 196 | — | ~2.4k | Automated safety check: Pass | MIT | |
| Gated Module ImplementationAlephantAI/AIephant-AI-Agent-Gateway | 114 | — | ~2.7k | Automated safety check: Pass | GPL-3.0 | |
| Code ReviewHyk260/PureChat | 546 | — | ~645 | Automated safety check: Pass | MIT |
Similar skills
Deep Review
dyad-sh/dyad
Deep multi-agent code review run locally — a fleet of parallel finder agents reviews the diff from independent angles, then adversarial verifier agents reproduce each finding before it is reported.
Coding Protocol
lencx/skills
Risk-scaled repo execution and code-evidence protocol. An agent skill from lencx/skills.
Gated Module Implementation
AlephantAI/AIephant-AI-Agent-Gateway
Plan-first, one-time human plan approval; batched execution in either Gated (human confirms between batches) or Auto-loop (continuous run after plan approval); strict task-state updates; automatic…
Code Review
Hyk260/PureChat
Perform code reviews (CR) for changed files in the current repository.
Code Review
initializ/forge
AI-powered code review for diffs and individual files using LLM analysis
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Audit and improve project memory files (CLAUDE.md, AGENTS.md, .claude.local.md) — assess against a quality rubric, then apply additions and removals.
Sc Hypothesize
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A skill your agent uses when multiple plausible approaches must be generated, tested, and compared against constraints before the user chooses.
Sc Socratic
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A skill your agent uses when the user is clarifying beliefs, assumptions, goals, or framing before committing to decision or plan.
Hud First
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A skill your agent uses when designing AI features and the real opportunity may be perception support, not delegated conversational work.
Human Writing
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A skill your agent uses when writing or editing a Slack message, email, pull request body, GitHub issue, Reddit post, agenda, or doc.
Related
Works with
Categories
Questions about External Agents
What does External Agents do?
Invoke external AI CLIs (Codex, Gemini) for second opinions, code reviews, or alternative analysis. External Agents is an agent skill from kylesnowschwartz/SimpleClaude. Invoke external AI CLIs (Codex, Gemini) for second opinions, code reviews, or alternative analysis.
When should I use External Agents?
External Agents fits situations like: asks for a second opinion; get another AIs take; needs verification from a different model.
How do I install External Agents in Claude Code?
Run `npx skills add kylesnowschwartz/SimpleClaude --skill external-agents -a claude-code`. Or copy the skill folder (plugins/sc-skills/skills/external-agents in kylesnowschwartz/SimpleClaude) into .claude/skills/external-agents in your project. Claude Code loads it when a task matches its description.
How do I install External Agents in Codex?
Run `npx skills add kylesnowschwartz/SimpleClaude --skill external-agents -a codex`. Or copy the skill folder (plugins/sc-skills/skills/external-agents in kylesnowschwartz/SimpleClaude) into .agents/skills/external-agents in your project. Codex loads it when a task matches its description.
Can I use External Agents 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 kylesnowschwartz/SimpleClaude --skill external-agents -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/external-agents, .gemini/skills/external-agents, .github/skills/external-agents and .opencode/skills/external-agents in your project.
What does External Agents need to run?
Going by SKILL.md and its folder, External Agents needs the command-line tools its instructions call (codex, gemini, git, node, npm and brew) and credentials named GEMINI_API_KEY. Our summary lists: Node.js; A credential in GEMINI_API_KEY.
Does External Agents access the network?
SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.
Is External Agents 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. Review the folder before installing.
What licence does External Agents use?
No licence was found for External Agents or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does External Agents use?
About 3.2k tokens (SKILL.md is roughly 13k 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 External Agents?
Skills that share tags, products or a category with External Agents: Open Code Review CLI (alibaba/open-code-review, 45k stars), Deep Review (dyad-sh/dyad, 22k stars), Coding Protocol (lencx/skills, 196 stars) and Gated Module Implementation (AlephantAI/AIephant-AI-Agent-Gateway, 114 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains External Agents?
kylesnowschwartz (a GitHub user) maintains it in kylesnowschwartz/SimpleClaude, which has 114 GitHub stars. The repository holds 12 skills in this directory. The repository was last updated on October 5, 2026.
Source: kylesnowschwartz/SimpleClaude on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.