Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add julianobarbosa/claude-code-skills --skill shellcheckgit clone --depth 1 https://github.com/julianobarbosa/claude-code-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/julianobarbosa/claude-code-skills/shellcheck)<a href="https://agentmods.dev/skills/julianobarbosa/claude-code-skills/shellcheck"><img src="https://agentmods.dev/badge/skills/julianobarbosa/claude-code-skills/shellcheck/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/julianobarbosa/claude-code-skills/shellcheck"><img src="https://agentmods.dev/badge/skills/julianobarbosa/claude-code-skills/shellcheck.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Data Exfiltration · line 25 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00047 | $0.01292 |
| Opus 5 | $0.00023 | $0.00646 |
| Sonnet 5 | $0.00009 | $0.00258 |
| Haiku 4.5 | $0.00005 | $0.00129 |
Grade A, and why
shellcheck scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -s -X POST http://localhost:8888/notify \ How it starts
The opening of the file, as written. The whole thing — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ShellCheck - Shell Script Static Analysis
Auto-routes when user mentions shellcheck, shell linting, bash script analysis, or SC error codes.
Overview
ShellCheck is a GPLv3-licensed static analysis tool that identifies bugs in bash/sh shell scripts. It detects:
- Syntax errors and parsing issues
- Semantic problems causing unexpected behavior
- Quoting issues and word splitting bugs
- POSIX compatibility warnings
- Style and best practice violations
Voice Notification
When executing a workflow, do BOTH:
-
Send voice notification:
curl -s -X POST http://localhost:8888/notify \ -H "Content-Type: application/json" \ -d '{"message": "Running the WORKFLOWNAME workflow from the ShellCheck skill"}' \ > /dev/null 2>&1 & -
Output text notification:
Running the **WorkflowName** workflow from the **ShellCheck** skill...
Workflow Routing
| Workflow | Trigger | File |
|---|---|---|
| Analyze | "shellcheck this", "lint script", "check shell" | Workflows/Analyze.md |
| Fix | "fix shell errors", "apply shellcheck fixes" | Workflows/Fix.md |
| Setup | "setup shellcheck", "configure shellcheck" | Workflows/Setup.md |
| Explain | "explain SC2086", "what is SC code" | Workflows/Explain.md |
Quick Reference
Basic Usage
# Check a script
shellcheck myscript.sh
# Specify shell dialect
shellcheck -s bash myscript.sh
# Exclude specific codes
shellcheck -e SC2086,SC2046 myscript.sh
# Output formats
shellcheck -f gcc myscript.sh # Editor integration
shellcheck -f json myscript.sh # Machine readable
shellcheck -f diff myscript.sh # Auto-fix patches
Common SC Codes
| Code | Issue | Fix |
|---|---|---|
| SC2086 | Unquoted variable | "$var" |
| SC2046 | Unquoted command substitution | "$(cmd)" |
| SC2034 | Unused variable | Remove or export |
| SC2154 | Unassigned variable | Assign or disable |
| SC2155 | Declare and assign separately | Split declaration |
What ships with it
9 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 142 lines · 47 tokens per session scan A 69c121042d7b
shellcheck is a skill published in the GitHub repository julianobarbosa/claude-code-skills (10 stars, last pushed 16d ago), licensed MIT. It adds 47 tokens to every session and 1,292 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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