Agent skill

Check

Reviews code diffs, PRs, issue queues, release readiness, commits, pushes, publishing, and project audits.

No licenceAuto-check passedDevelopment

Install Check

skills CLI

$ npx skills add ninehills/skills --skill check -a claude-code

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

GitHub CLI

$ gh skill install ninehills/skills check --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/ninehills/skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/check .claude/skills/check && 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 "check" agent skill from https://github.com/ninehills/skills/tree/main/check into .claude/skills/check/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check", 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/ninehills/skills/tree/main/check

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 ninehills/skills --skill check -a codex

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

GitHub CLI

$ gh skill install ninehills/skills check --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/ninehills/skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/check .agents/skills/check && 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 "check" agent skill from https://github.com/ninehills/skills/tree/main/check into .agents/skills/check/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check", 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 ninehills/skills --skill check -a cursor

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

GitHub CLI

$ gh skill install ninehills/skills check --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/ninehills/skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/check .cursor/skills/check && 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 "check" agent skill from https://github.com/ninehills/skills/tree/main/check into .cursor/skills/check/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check", 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/ninehills/skills.git --path check

--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 ninehills/skills --skill check -a gemini-cli

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

GitHub CLI

$ gh skill install ninehills/skills check --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/ninehills/skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/check .gemini/skills/check && 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 "check" agent skill from https://github.com/ninehills/skills/tree/main/check into .gemini/skills/check/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check", 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 ninehills/skills check

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 ninehills/skills --skill check -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/ninehills/skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/check .github/skills/check && 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 "check" agent skill from https://github.com/ninehills/skills/tree/main/check into .github/skills/check/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check", 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 ninehills/skills --skill check -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 ninehills/skills check --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/ninehills/skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/check .opencode/skills/check && 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 "check" agent skill from https://github.com/ninehills/skills/tree/main/check into .opencode/skills/check/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "check", 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: check
GitHub stars: 280
Token cost: ~10k tokens
SKILL.md length: 5,544 words
Files: 8 (incl. scripts, references)
Skills in repo: 38
Repo updated: Jun 22, 2026
First seen: Oct 7, 2026
Licence: None found

At a glance

Reviews code diffs, PRs, issue queues, release readiness, commits, pushes, publishing, and project audits.

Works in 5 steps: Read the diff and identify changed… → Inspect public project files only as… → Compress the findings into review… → …
Users ask in any language for code review
SKILL.md covers Outcome Contract, Worktree Safety Preflight, Mode Picker and Project Context Extraction, plus 23 more sections
Runs Python and Shell scripts from its folder; calls git, gh and bash

What it does

Check is an agent skill from ninehills/skills. Reviews code diffs, PRs, issue queues, release readiness, commits, pushes, publishing, and project audits. Use when users ask in any language for code review, issue or PR triage, release gates, publishing follow-through, or project audits. Not for debugging root causes or prose review.

Its SKILL.md is about 10k tokens, which your agent loads only when the skill is triggered. The skill folder holds 10 other files, including scripts and reference files (for example `agents/reviewer-architecture.md`, `agents/reviewer-security.md` and `references/persona-catalog.md`).

It sits in Development, covering Root cause analysis and Feature launches and release readiness. It works with Git.

When your agent uses it

Users ask in any language for code review
Publishing follow-through

Example prompts

“Use the check skill to review code diffs, PRs, issue queues, release readiness, commits, pushes, publishing, and project audits”
“/check”

Requirements

Python 3
A Bash shell

Workflow steps

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

Read the diff and identify changed languages, frameworks, manifests, generated outputs, release files, and CI workflows.
Inspect public project files only as needed: README, AGENTS/CLAUDE instructions when present, package manifests, lockfiles, build configs…
Compress the findings into review context: verification commands, protected or generated files, release artifacts, domain risks, and…
Apply the stricter rule when project context and this skill overlap.
If project docs or CI name a verification command, prefer that over auto-detection.

What it can do on your machine

Read from SKILL.md and the folder at commit f3e82a7. 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 2 files in scripts/ (Python and Shell), which the agent can run.
Shell commands in SKILL.md call:
- git
- gh
- bash
- python3
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use git and gh, which can reach the network depending on how they are called.
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

Check loads about 10k tokens when it runs, and up to ~13k if it reads all its reference files. Until then it costs about 73 tokens; SKILL.md has 5,544 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~73
When it runs · the whole SKILL.md, loaded when a task matches: ~10k
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~13k

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 5,544 words (~9,977 tokens).

“Prefix your first line with 🥷 inline, not as its own paragraph.”

— opening of SKILL.md by ninehills

name: check
when_to_use: review, 看看代码, 检查一下, 有没有问题, 是否需要优化, 合并前, 继续优化, 优化代码, 看看issue, 看看PR, release, publish, push, release reaction, GitHub reaction, 发布, 提交, 关闭issue, 发布表情…
dispatch_intent: Code review, before merge, release gates, generated artifacts, safety sinks, publish/push/reaction follow-through, triage issues/PRs, project-wide…

Outline of SKILL.md

Check: Review Before You Ship
Outcome Contract
Worktree Safety Preflight
Mode Picker
Project Context Extraction
Durable Context Preflight
Plan Execution Mode
Default Continuation (review-then-ship)
Get the Diff
Triage Mode
Release Worthiness Analysis
Ship / Release Follow-through
Reworked Or Cancelled Release Gate
Project Audit Mode
Scope
Did We Build What Was Asked?
Pattern-Fix Completeness
Testability Seam For Recurring Bugs
CLI Command Surface
Skill, Plugin, And Packaged Install Surface
Hard Stops (fix before merging)
Finding Quality Gate
Knowledge Sync
Snapshot Report Routing
Specialist Review (Standard and Deep only)
Autofix Routing
Adversarial Pass (Deep only)
Platform Operations
Verification
Gotchas

Read the full SKILL.md on GitHub

Files

SKILL.md and 7 other files (scripts, references) in check of ninehills/skills.

SKILL.md
agents/reviewer-architecture.md
agents/reviewer-security.md
references/persona-catalog.md
references/project-context.md
references/public-reply.md
scripts/audit_signals.py
scripts/run-tests.sh

Open the folder on GitHubat commit f3e82a7

Compare with similar skills

Check 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.

Check compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Check this skillninehills/skills	280	—	~10k	Automated safety check: Pass	None	3 mo ago
Code Design Rationale Investigatorcursor/plugins	10k	9 repos	~2.6k	Automated safety check: Pass	None	yesterday
Debugging and Error Recoveryaddyosmani/agent-skills	103k	1 repos	~2.6k	Automated safety check: Pass	MIT	6 days ago
Happier Reviewhappier-dev/happier	1.9k	—	~4.5k	Automated safety check: Pass	MIT	today
Root Cause Tracingsandgardenhq/sgai	137	4 repos	~1.4k	Automated safety check: Pass	Custom licence	18 days ago
Codexqa Rootcause Analyzeropenqa-cn/codexqa	152	—	~2.6k	Automated safety check: Pass	Apache-2.0	6 days ago

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Questions about Check

What does Check do?

Reviews code diffs, PRs, issue queues, release readiness, commits, pushes, publishing, and project audits. Check is an agent skill from ninehills/skills. Reviews code diffs, PRs, issue queues, release readiness, commits, pushes, publishing, and project audits.

When should I use Check?

Check fits situations like: users ask in any language for code review; publishing follow-through.

How do I install Check in Claude Code?

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

How do I install Check in Codex?

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

Can I use Check 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 ninehills/skills --skill check -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/check, .gemini/skills/check, .github/skills/check and .opencode/skills/check in your project.

What does Check need to run?

Going by SKILL.md and its folder, Check needs Python and a shell for the scripts in its folder and the command-line tools its instructions call (git, gh, bash and python3). Our summary lists: Python 3; A Bash shell.

Does Check access the network?

SKILL.md contains no URLs. Its commands use git and gh, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Check 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 Check use?

No licence was found for Check or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Check use?

About 10k tokens (SKILL.md is roughly 40k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 3.3k tokens, read only when the agent opens those files.

What are the alternatives to Check?

Skills that share tags, products or a category with Check: Code Design Rationale Investigator (cursor/plugins, 10k stars), Debugging and Error Recovery (addyosmani/agent-skills, 103k stars), Happier Review (happier-dev/happier, 1.9k stars) and Root Cause Tracing (sandgardenhq/sgai, 137 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Check?

ninehills (a GitHub user) maintains it in ninehills/skills, which has 280 GitHub stars. The repository holds 38 skills in this directory. The repository was last updated on June 22, 2026.

Source: ninehills/skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Check

Install Check

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

Files

Compare with similar skills

Similar skills

Code Design Rationale Investigator

Debugging and Error Recovery

Happier Review

Root Cause Tracing

Codexqa Rootcause Analyzer

Investigate Issue

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Questions about Check

Install Check

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

Files

Compare with similar skills

Similar skills

More from ninehills/skills

Related

Questions about Check