shellcheck-configuration

Overview of shellcheck-configuration skill

What the shellcheck-configuration skill does

The shellcheck-configuration skill helps an agent set up, interpret, and tune ShellCheck for real shell-script quality work. It is most useful when you need more than “run the linter”: project-level configuration, CI gating, shell-target selection, warning suppression strategy, and guidance on fixing findings without breaking portability.

Who should use shellcheck-configuration

This skill fits:

• developers adding ShellCheck to a repository for the first time
• teams standardizing shell linting in CI or code review
• maintainers cleaning up legacy bash, sh, dash, or ksh scripts
• reviewers who want consistent lint guidance instead of ad hoc comments

If your main need is “explain one warning code,” ordinary prompting may be enough. If you need a repeatable setup and policy, the shellcheck-configuration skill is a better fit.

The real job-to-be-done

Users usually want one of four outcomes:

1. install ShellCheck correctly on their platform
2. configure it for the right shell and rule tolerance
3. integrate it into CI or pre-merge checks
4. turn noisy lint output into actionable fixes and review standards

This skill is strongest when your goal includes both tooling and decision-making.

What makes this skill different from a generic prompt

A generic prompt can suggest “use ShellCheck.” The shellcheck-configuration skill is more useful when you need structured help with:

• choosing a target shell and matching options
• deciding what to suppress and what to enforce
• creating a .shellcheckrc policy that matches the repo
• handling false positives in a maintainable way
• using ShellCheck for Code Review, not just local lint runs

Important adoption constraints

This skill is guidance-heavy rather than automation-heavy. The repository evidence shows a single SKILL.md with no helper scripts or packaged resources, so expect strong instruction and examples, not turnkey commands tailored to your repository. You will get the best results when you provide actual shell files, current errors, and your CI context.

How to Use shellcheck-configuration skill

Install context for shellcheck-configuration install

Install the skill into your agent environment with:

npx skills add https://github.com/wshobson/agents --skill shellcheck-configuration

Then make sure ShellCheck itself is available in the environment where analysis will happen:

# macOS
brew install shellcheck

# Ubuntu/Debian
apt-get install shellcheck

# Verify
shellcheck --version

The skill helps with configuration and usage; it does not replace the shellcheck binary.

Read this file first

Start with:

• plugins/shell-scripting/skills/shellcheck-configuration/SKILL.md

Because this skill has no separate README.md, rules, or helper scripts, nearly all practical guidance is concentrated there. Read it first before inferring capabilities from the broader repo.

Best use cases in practice

Use shellcheck-configuration usage when you need to:

• create or refine a project .shellcheckrc
• choose between strict enforcement and gradual adoption
• fix repeated warning patterns across many scripts
• wire ShellCheck into CI/CD pipelines
• review a pull request containing shell changes
• decide whether an inline disable is acceptable

Inputs the skill needs to work well

Provide concrete inputs, not just “configure ShellCheck.” Best inputs include:

• target shell: bash, sh, dash, ksh
• sample script or repository path
• current shellcheck output
• whether the code runs in CI, containers, or multiple distros
• team policy: fail on warnings, only on errors, or advisory only
• whether portability to POSIX sh matters

Without that context, the skill can only give generic recommendations.

Turn a rough goal into a strong prompt

Weak prompt:

• “Help me use ShellCheck.”

Strong prompt:

• “Use the shellcheck-configuration skill to propose a .shellcheckrc for a repo with mostly bash scripts, a few POSIX sh entrypoints, CI on Ubuntu, and a goal of blocking high-confidence issues while allowing justified inline suppressions. Explain each config choice and how it affects code review.”

Why this works:

• it names the shell mix
• defines enforcement level
• gives environment constraints
• asks for rationale, not just a file dump

Example prompt for shellcheck-configuration for Code Review

Use a prompt like:

Use the shellcheck-configuration skill for Code Review. Review this shell script diff, identify the ShellCheck issues most likely to matter in production, separate correctness bugs from style issues, and recommend whether to fix, suppress, or ignore each one. Assume the repo standard is Bash in CI but portability matters for small utility scripts.

This gets better results than “review this script,” because it asks the agent to classify issues and apply policy.

Suggested workflow from install to enforcement

1. Install ShellCheck.
2. Invoke the shellcheck-configuration skill with your shell targets and repo goals.
3. Generate or refine .shellcheckrc.
4. Run shellcheck on representative scripts first.
5. Fix high-signal warnings before enforcing in CI.
6. Decide suppression policy for justified exceptions.
7. Add CI or pre-commit integration only after warning volume is manageable.

This sequence reduces the common failure mode where teams enable lint gates before aligning on policy.

How to use the skill with existing lint output

If you already ran shellcheck, paste:

• warning codes such as SC2086, SC2046, SC2155
• the affected lines
• whether the issue is intentional
• the shell declared by the script shebang

The skill is especially valuable when you want guidance on whether a warning reflects:

• a real bug
• a portability risk
• a style preference
• a false positive worth suppressing

Configuration decisions that matter most

The highest-impact choices are usually:

• target shell correctness
• whether to use project-level .shellcheckrc
• when to prefer inline disables over global ignores
• whether CI should fail on all findings or a subset
• how much legacy code to grandfather in

These decisions affect trust in the tool more than any single warning fix.

Practical tips that improve output quality

Ask the skill to produce:

• a draft .shellcheckrc
• a suppression policy with examples
• CI command examples
• a “fix-now vs later” triage of warnings
• code-review guidance for recurring findings

This is more useful than asking for raw ShellCheck theory. The skill contains fundamentals, but the real value is turning them into repo policy.

shellcheck-configuration skill FAQ

Is shellcheck-configuration good for beginners?

Yes, if you are actively working on shell scripts. The skill includes ShellCheck fundamentals and installation guidance, so it can help a beginner get started. It is still most valuable when paired with real scripts and real warnings.

Do I need the shellcheck-configuration skill if I already know ShellCheck?

Possibly. If you already know the warning catalog and command-line basics, the skill is still useful for repository-wide configuration, CI policy, suppression strategy, and ShellCheck-driven review workflows.

Does it include automation scripts or ready-made CI templates?

No strong evidence of that in this skill. The repository signals show only SKILL.md, so expect conceptual guidance and examples rather than bundled scripts or reusable templates.

When should I not use shellcheck-configuration?

Skip it if:

• you only need to run shellcheck file.sh once
• your issue is unrelated to static analysis policy
• you want an auto-fixer; ShellCheck primarily reports issues rather than rewriting code
• your team has already settled configuration and only needs a command reference

How is this different from ordinary prompting?

Ordinary prompting can explain warnings, but it often misses repo-level decisions: shell target, suppression boundaries, rollout strategy, and code review standards. The shellcheck-configuration guide is better when you want a repeatable linting approach, not a one-off answer.

Is shellcheck-configuration suitable for mixed shell repos?

Yes, but only if you tell the skill the mix. Repos that contain both bash and POSIX sh scripts need explicit scoping; otherwise recommendations may overfit one shell and create noise for the other.

How to Improve shellcheck-configuration skill

Give the skill your actual shell environment

The fastest way to improve shellcheck-configuration results is to specify:

• shell dialect per script group
• OS or CI runner
• whether scripts are sourced or executed directly
• whether portability is required

ShellCheck recommendations depend heavily on shell semantics. Ambiguous inputs lead to overbroad advice.

Provide real files, not summaries

Instead of saying “we have some shell scripts,” give:

• one representative script
• current .shellcheckrc, if any
• a few current warning codes
• CI snippets that run linting today

This lets the skill move from generic best practices to concrete configuration.

Ask for policy, not just syntax

A stronger request is:

• “draft a .shellcheckrc and explain what the team should enforce”

A weaker request is:

• “show shellcheck config options”

Users care more about what to standardize than about memorizing flags. Ask the skill to help you choose a maintainable policy.

Watch for common failure modes

Common ways to get poor output:

• not specifying bash vs sh
• asking for zero-warning enforcement on a noisy legacy repo
• suppressing warnings globally before understanding them
• treating all findings as equally severe
• ignoring code review workflow and focusing only on local runs

The skill is most helpful when you use it to prioritize, not just enumerate.

Improve shellcheck-configuration for Code Review workflows

For review use, ask the skill to categorize findings into:

• correctness
• quoting and expansion safety
• portability
• maintainability
• style-only

That helps reviewers avoid blocking merges for low-value style issues while still catching dangerous shell patterns.

Iterate after the first output

After the first response, follow up with:

• “tighten this config for CI”
• “make this safer for POSIX portability”
• “reduce false positives for sourced helper files”
• “which suppressions should stay inline rather than in .shellcheckrc?”

The first pass should establish direction; the second should tailor enforcement.

Use the skill to stage adoption

For large legacy repos, ask for:

1. a baseline advisory configuration
2. a prioritized fix list
3. a stricter future-state config

This staged approach is often better than flipping on hard-fail linting immediately and creating broad developer resistance.

Compare recommendations against actual ShellCheck output

The best validation loop is simple:

1. ask the skill for config and policy
2. run shellcheck
3. inspect the resulting warning mix
4. feed the results back into the skill for refinement

That loop turns the shellcheck-configuration skill from static guidance into a practical rollout tool.