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 dwmkerr/claude-toolkit --skill shell-script-developmentgit clone --depth 1 https://github.com/dwmkerr/claude-toolkitWrote 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/dwmkerr/claude-toolkit/shell-script-development)<a href="https://agentmods.dev/skills/dwmkerr/claude-toolkit/shell-script-development"><img src="https://agentmods.dev/badge/skills/dwmkerr/claude-toolkit/shell-script-development/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/dwmkerr/claude-toolkit/shell-script-development"><img src="https://agentmods.dev/badge/skills/dwmkerr/claude-toolkit/shell-script-development.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00032 | $0.00348 |
| Opus 5.5 | $0.00013 | $0.00139 |
| Sonnet 5.5 | $0.00006 | $0.00070 |
| Haiku 4.5 | $0.00003 | $0.00035 |
Grade A, and why
shell-script-development scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Shell Script Development
Create shell scripts following consistent conventions.
Template
#!/usr/bin/env bash
set -e -o pipefail
# Colors
green='\033[0;32m'
red='\033[0;31m'
yellow='\033[1;33m'
blue='\033[0;34m'
nc='\033[0m'
# Script logic here
echo -e "${green}✔${nc} completed successfully"
Conventions
| Element | Convention |
|---|---|
| Shebang | #!/usr/bin/env bash |
| Safety | set -e -o pipefail |
| Local variables | Lowercase (model, dir, count) |
| Environment variables | Uppercase (PATH, HOME, USER) |
| Color variables | Lowercase (green, red, nc) |
| Status words | Lowercase (error, warning, note) |
Status Output Patterns
echo -e "${green}✔${nc} task completed" # success
echo -e "${red}error${nc}: something failed" # error
echo -e "${yellow}warning${nc}: something to note" # warning
echo -e "${blue}info${nc}: informational message" # info
Important
After creating or modifying shell scripts, inform the user:
Make executable. Run
chmod +x script.shbefore use.
What ships with it
1 file 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.
- 1mo ago First seen · 54 lines · 32 tokens per session scan A fe484b57b610
shell-script-development is a skill published in the GitHub repository dwmkerr/claude-toolkit (23 stars, last pushed 1mo ago), licensed MIT. It adds 32 tokens to every session and 348 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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