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Agent skill

Check

by timusus in timusus/Shuttle2

Run lint + unit tests, investigate and fix failures. An agent skill from timusus/Shuttle2.

Apache-2.0Auto-check passedTesting & QA

Install Check

skills CLI
$ npx skills add timusus/Shuttle2 --skill check -a claude-code

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

GitHub CLI
$ gh skill install timusus/Shuttle2 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/timusus/Shuttle2.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/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/

Facts

Skill name
check
GitHub stars
229
Token cost
~449 tokens
SKILL.md length
210 words
Files
1
Skills in repo
13
Repo updated
First seen
Licence
Apache-2.0

At a glance

Run lint + unit tests, investigate and fix failures. An agent skill from timusus/Shuttle2.

  • Works in 3 steps: Lint (auto-fix first, then verify) → Unit tests → Report results: Summarize what passed…
  • Tasks that involve Unit testing
  • SKILL.md covers Steps and When to use
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Check is an agent skill from timusus/Shuttle2. Run lint + unit tests, investigate and fix failures. Use after making changes.

Its SKILL.md is about 450 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 Testing & QA, covering Unit testing and Linting and formatting. It works with Android. The repository describes itself as: Shuttle Music: a music player for Android and iOS. Plays local files and streams from Jellyfin, Emby, Plex and Navidrome/Subsonic, with Chromecast, Android Auto, EQ and replay… The licence is Apache-2.0.

When your agent uses it

  • Tasks that involve Unit testing
  • Tasks that involve Linting and formatting

Example prompts

  • “/check”

Workflow steps

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

  1. Lint (auto-fix first, then verify)
  2. Unit tests
  3. Report results: Summarize what passed and what was fixed.

What it can do on your machine

Read from SKILL.md and the folder at commit 116c579. 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

    No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).

    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

Check loads about 449 tokens when it runs. Until then it costs about 21 tokens; SKILL.md has 210 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~21
When it runs · the whole SKILL.md, loaded when a task matches
~449

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

The full file from timusus/Shuttle2 at commit 116c579, republished under its Apache-2.0 licence (© timusus). 210 words, ~449 tokens.

Download SKILL.mdSave it as .claude/skills/check/SKILL.md (or your agent's skills folder).
name
check
description
Run lint + unit tests, investigate and fix failures. Use after making changes.
user_invocable
true

Check

Run lint and unit tests to verify changes. Investigate and fix any failures.

Steps

  1. Lint (auto-fix first, then verify):

    bash
    support/scripts/lint -F 2>&1 | tail -20

    Then run lint without auto-fix to check for remaining issues:

    bash
    support/scripts/lint 2>&1 | tail -40

    If lint fails, read the error output, fix the issues, and re-run.

  2. Unit tests:

    bash
    support/scripts/unit-test 2>&1 | tail -50

    Prefer support/scripts/unit-test --changed-tests for the fastest loop: it maps the current diff (against origin/main by default) down to the individual test classes that exercise the changed files, one Gradle invocation per module. It falls back to --changed's module-level mapping (or the full suite) when a file doesn't map cleanly to a class — see .claude/rules/testing.md for the mapping rules. Run the full suite once at the end via support/scripts/unit-test --changed or a plain support/scripts/unit-test. Otherwise use the module-scoped form, e.g. support/scripts/unit-test playback or support/scripts/unit-test playback app --tests '*QueueOperations*'. It accepts a short module name or a full Gradle path.

    If tests fail, read the failure output. The output shows the test class and method that failed, plus the assertion message. Open the failing test to understand what it expects, then fix the implementation (not the test) unless the test is wrong.

  3. Report results: Summarize what passed and what was fixed.

When to use

  • After implementing a feature or fix
  • After refactoring code
  • Before committing

© timusus, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .claude/skills/check of timusus/Shuttle2.

Open the folder on GitHubat commit 116c579

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
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Check this skilltimusus/Shuttle2229—~449Automated safety check: PassApache-2.0
Run Checksosama-raddad/FireCrasher147—~403Automated safety check: PassApache-2.0
Android CheckAdyen/adyen-android149—~357Automated safety check: PassMIT
Dep Validateblokadaorg/blokada3.3k—~5.7kAutomated safety check: NotesMPL-2.0
Testing SkillTypeCellOS/BlockNote10k—~2.6kAutomated safety check: PassCustom licence
Mesh Labpermissionlesstech/bitchat-android7.7k—~2.9kAutomated safety check: PassGPL-3.0

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More from timusus/Shuttle2

All 13 skills in this repo

  • Android Coroutine Testing

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    Comprehensive guidance for writing deterministic tests for Android code using Kotlin coroutines.

    229 GitHub stars~1.2k tokensUpdated yesterday
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  • Debug Receivers

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    Drive the S2 debug build's playback and queue over ADB broadcasts — play the whole library, play/pause, skip, seek, remove a queue item, toggle shuffle/repeat, dump playback state as JSON, reimport…

    229 GitHub stars~1.9k tokensUpdated yesterday
    Auto-check passed

  • Deploy Android

    timusus/Shuttle2

    Deploy the Android app to the Play Store via GitHub Actions.

    229 GitHub stars~1.2k tokensUpdated yesterday
    Auto-check passed

  • Reply Reviews

    timusus/Shuttle2

    Weekly Play Store review flow for S2: fetch new reviews, draft replies, get owner approval, then post.

    229 GitHub stars~1k tokensUpdated yesterday
    Auto-check passed

  • Commit

    timusus/Shuttle2

    Analyse working tree changes, group them into logical atomic commits, and create well-structured conventional commits with module scopes.

    229 GitHub stars~1.9k tokensUpdated yesterday
    Auto-check: notes

  • Delegate Verbose

    timusus/Shuttle2

    Run high-volume work in a subagent so its raw output never enters this conversation.

    229 GitHub stars~864 tokensUpdated yesterday
    Auto-check passed

Works with

Categories

Questions about Check

What does Check do?

Run lint + unit tests, investigate and fix failures. An agent skill from timusus/Shuttle2. Check is an agent skill from timusus/Shuttle2. Run lint + unit tests, investigate and fix failures.

When should I use Check?

Check fits situations like: tasks that involve Unit testing; tasks that involve Linting and formatting.

How do I install Check in Claude Code?

Run `npx skills add timusus/Shuttle2 --skill check -a claude-code`. Or copy the skill folder (.claude/skills/check in timusus/Shuttle2) 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 timusus/Shuttle2 --skill check -a codex`. Or copy the skill folder (.claude/skills/check in timusus/Shuttle2) 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 timusus/Shuttle2 --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?

SKILL.md names no scripts, command-line tools or credentials: Check is instructions for the agent only.

Does Check 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 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. Review the folder before installing.

What licence does Check use?

Check 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 Check use?

About 449 tokens (SKILL.md is roughly 1.8k 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 Check?

Skills that share tags, products or a category with Check: Run Checks (osama-raddad/FireCrasher, 147 stars), Android Check (Adyen/adyen-android, 149 stars), Dep Validate (blokadaorg/blokada, 3.3k stars) and Testing Skill (TypeCellOS/BlockNote, 10k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Check?

timusus (a GitHub user) maintains it in timusus/Shuttle2, which has 229 GitHub stars. The repository holds 13 skills in this directory. The repository was last updated on October 6, 2026.

Source: timusus/Shuttle2 on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.