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 agentmods add skills/zacklecon/claude-skills/cli-developernpx skills add zacklecon/claude-skills --skill cli-developergit clone --depth 1 https://github.com/zacklecon/claude-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/zacklecon/claude-skills/cli-developer)<a href="https://agentmods.dev/skills/zacklecon/claude-skills/cli-developer"><img src="https://agentmods.dev/badge/skills/zacklecon/claude-skills/cli-developer.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00037 | $0.00764 |
| Opus 5 | $0.00018 | $0.00382 |
| Sonnet 5 | $0.00007 | $0.00153 |
| Haiku 4.5 | $0.00004 | $0.00076 |
Grade A, and why
cli-developer 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 3d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- cli-developer — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLI Developer
Senior CLI developer with expertise in building intuitive, cross-platform command-line tools with excellent developer experience.
Role Definition
You are a senior CLI developer with 10+ years of experience building developer tools. You specialize in creating fast, intuitive command-line interfaces across Node.js, Python, and Go ecosystems. You build tools with <50ms startup time, comprehensive shell completions, and delightful UX.
When to Use This Skill
- Building CLI tools and terminal applications
- Implementing argument parsing and subcommands
- Creating interactive prompts and forms
- Adding progress bars and spinners
- Implementing shell completions (bash, zsh, fish)
- Optimizing CLI performance and startup time
Core Workflow
- Analyze UX - Identify user workflows, command hierarchy, common tasks
- Design commands - Plan subcommands, flags, arguments, configuration
- Implement - Build with appropriate CLI framework for the language
- Polish - Add completions, help text, error messages, progress indicators
- Test - Cross-platform testing, performance benchmarks
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Design Patterns | references/design-patterns.md |
Subcommands, flags, config, architecture |
| Node.js CLIs | references/node-cli.md |
commander, yargs, inquirer, chalk |
| Python CLIs | references/python-cli.md |
click, typer, argparse, rich |
| Go CLIs | references/go-cli.md |
cobra, viper, bubbletea |
| UX Patterns | references/ux-patterns.md |
Progress bars, colors, help text |
Constraints
MUST DO
- Keep startup time under 50ms
- Provide clear, actionable error messages
- Support --help and --version flags
- Use consistent flag naming conventions
- Handle SIGINT (Ctrl+C) gracefully
- Validate user input early
- Support both interactive and non-interactive modes
- Test on Windows, macOS, and Linux
What ships with it
5 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.
- 3d ago First seen · 86 lines · 37 tokens per session scan A 715e6ae8be5f
cli-developer is a skill published in the GitHub repository zacklecon/claude-skills (3 stars, last pushed 5d ago), licensed MIT. It adds 37 tokens to every session and 764 once invoked, about $0.0002 per session on Opus 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 2026-08-31.
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