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Guide · Agent skill

How to use the ShellCheck Configuration Helper agent skill

Updated · written with AI from the project's own documentation and checked against our catalogue data

The ShellCheck Configuration Helper is an agent skill, a packaged set of instructions that an AI agent such as Claude loads when your request matches its purpose. This guide shows you how to install the shellcheck-configuration skill, how to ask for help with it in plain language, and what it does and does not do. By the end you will know how to get the agent's help configuring ShellCheck, reading its warning codes and fixing flagged issues in your shell scripts.

ShellCheck Configuration Helperwshobson/agents · MIT

Quick start

  1. 1Download the ZIP. Download the shellcheck-configuration skill as a ZIP file from this directory page.
  2. 2Unzip into a skills folder. Unzip it into ~/.claude/skills/ for personal use, or into your project's .claude/skills/ folder for one project.
  3. 3Install ShellCheck. Install ShellCheck on your machine or CI runner using Homebrew, apt-get or a source build, then confirm with shellcheck --version.
  4. 4Ask in plain language. Describe your goal, such as setting up linting or explaining a warning code, and mention ShellCheck or your script.
  5. 5Review the advice. Check any suggested .shellcheckrc changes, CI config or fixes before applying them.
  6. 6Document exclusions. For every warning you disable, add a comment explaining why so the decision stays clear later.

What the shellcheck-configuration skill makes the agent do

ShellCheck is a static analysis tool that finds bugs and portability problems in shell scripts without running them. With this skill loaded, the agent can advise you on configuring ShellCheck, explain what its error codes mean, suppress false positives using documented exclusions, and fix the issues it flags.

The skill also covers wiring ShellCheck into CI pipelines, pre-commit hooks and editors. Its main text is a guide. A second file, references/details.md, holds longer pattern documentation that the agent reads when the guide alone is not enough.

  • Explain ShellCheck error and warning codes
  • Set up linting in CI/CD, pre-commit hooks and editors
  • Configure a .shellcheckrc file for a project
  • Suppress false positives with documented exclusions
  • Fix flagged issues and check script portability

Install the skill: download the ZIP and unzip it

Download the skill as a ZIP file from this directory page. Then choose one of two locations, depending on whether you want the skill for all your projects or one project only.

For a personal install available in every project, unzip the download into ~/.claude/skills/. For a single project, unzip it into that project's .claude/skills/ folder. The skill folder should contain SKILL.md and references/details.md.

If you use the Claude apps instead of a local setup, you can upload the skill under Settings → Capabilities → Skills.

  • Personal install: ~/.claude/skills/
  • Project install: .claude/skills/ inside your project
  • Claude apps: Settings → Capabilities → Skills

Install ShellCheck itself

The skill does not install ShellCheck. You need ShellCheck on the machine or CI runner where your scripts are checked. Verify the installation with the version flag.

The source lists these installation routes: Homebrew on macOS, apt-get on Ubuntu/Debian, or building from source.

  • Homebrew on macOS
  • apt-get on Ubuntu/Debian
  • Build from source from the official koalaman/shellcheck repository
shellcheck --version

How to trigger the skill with natural requests

You do not need a special command. Describe what you want in plain language and mention ShellCheck, linting or your script. The agent loads the skill when your request fits its description, which covers setting up linting infrastructure, fixing code issues and ensuring script portability.

Be specific about your goal and, where it helps, name the file or the warning code. The more context you give, the more useful the advice.

  • "Set up ShellCheck for the shell scripts in this repo and add it to CI."
  • "What does ShellCheck warning SC2086 mean and how do I fix it in deploy.sh?"
  • "Add a .shellcheckrc that targets bash and disables SC1091 with a comment explaining why."
  • "Help me add ShellCheck as a pre-commit hook."

Configure ShellCheck with a .shellcheckrc file

A project-level .shellcheckrc file in the project root sets the target shell, enables optional checks and disables specific warnings. The skill's reference notes that you should document why each exclusion exists, and treat disabling a warning as a last resort rather than a quick fix.

The reference also covers environment variables for configuration. Ask the agent to walk through the options that match your project.

  • Set the target shell, for example shell=bash
  • Enable optional checks with enable=
  • Disable specific warnings with disable=
  • Document each exclusion so future readers know why it exists
# Specify target shell shell=bash # Enable optional checks enable=avoid-nullary-conditions enable=require-variable-braces # Disable specific warnings disable=SC1091 disable=SC2086

Safety notes: what the skill runs and what it can reach

The skill does not run scripts and does not use the network, according to its listing. It is guidance text plus a reference file, so loading it does not execute your code. The commands you see in the guide are for you or the agent to run deliberately.

Still, review any command the agent proposes before running it, especially install commands and changes to CI configuration. ShellCheck itself must be installed separately, as described above.

  • Runs scripts: no
  • Uses network: no
  • ShellCheck must be installed separately

What people use it for

  • Adding ShellCheck to a repository's CI pipeline for the first time
  • Understanding a specific warning code such as SC2086 and how to fix it
  • Creating a .shellcheckrc that targets bash and documents each disabled warning
  • Setting up a pre-commit hook so issues are caught before a push
  • Checking scripts for portability problems when they must run under sh or dash

Frequently asked questions

Is the ShellCheck Configuration skill free?

The skill is published under the MIT licence, as listed on this page. ShellCheck itself is a separate tool that you install yourself using Homebrew, apt-get or a source build.

Do I need to install ShellCheck before using this skill?

Yes. The skill does not install ShellCheck. You need it on the machine or CI runner where your scripts are checked, and you can confirm it works with shellcheck --version.

Where do I put the skill files after downloading?

Unzip the ZIP into ~/.claude/skills/ for personal use, or into .claude/skills/ inside a project. In the Claude apps, you can upload it under Settings → Capabilities → Skills.

Does this skill run my shell scripts or access the internet?

According to its listing, the skill does not run scripts and does not use the network. ShellCheck analyses scripts without running them.

How do I stop ShellCheck flagging a false positive?

Use a documented exclusion, such as a disable entry in .shellcheckrc or a suppression comment, and explain why in a comment. The skill advises against disabling warnings without addressing them.

Can this skill replace testing my scripts?

No. Static analysis catches common pitfalls but not all logic errors, so keep your normal testing alongside ShellCheck.

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Our verdict

Choose this skill if you maintain bash or sh scripts and want consistent ShellCheck linting in CI, or if you are adding ShellCheck to a repository for the first time. Skip it if you need help writing shell scripts from scratch, if your project has no shell scripts, or if you expect it to guarantee script correctness.

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