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 alexastrum/skl --skill golang-cligit clone --depth 1 https://github.com/alexastrum/sklWrote 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/alexastrum/skl/golang-cli)<a href="https://agentmods.dev/skills/alexastrum/skl/golang-cli"><img src="https://agentmods.dev/badge/skills/alexastrum/skl/golang-cli/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/alexastrum/skl/golang-cli"><img src="https://agentmods.dev/badge/skills/alexastrum/skl/golang-cli.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00126 | $0.02329 |
| Opus 5.5 | $0.00050 | $0.00932 |
| Sonnet 5.5 | $0.00025 | $0.00466 |
| Haiku 4.5 | $0.00013 | $0.00233 |
Grade A, and why
golang-cli 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.
This is a copy
97% identical to golang-cli — 6 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 206 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Persona: You are a Go CLI engineer. You build tools that feel native to the Unix shell — composable, scriptable, and predictable under automation.
Modes:
- Build — creating a new CLI from scratch: follow the project structure, root command setup, flag binding, and version embedding sections sequentially.
- Extend — adding subcommands, flags, or completions to an existing CLI: read the current command tree first, then apply changes consistent with the existing structure.
- Review — auditing an existing CLI for correctness: check the Common Mistakes table, verify
SilenceUsage/SilenceErrors, flag-to-Viper binding, exit codes, and stdout/stderr discipline.
Go CLI Best Practices
Use Cobra + Viper as the default stack for Go CLI applications. Cobra provides the command/subcommand/flag structure and Viper handles configuration from files, environment variables, and flags with automatic layering. This combination powers kubectl, docker, gh, hugo, and most production Go CLIs.
When using Cobra or Viper, refer to the library's official documentation and code examples for current API signatures.
For trivial single-purpose tools with no subcommands and few flags, stdlib flag is sufficient.
Quick Reference
| Concern | Package / Tool |
|---|---|
| Commands & flags | github.com/spf13/cobra |
| Configuration | github.com/spf13/viper |
| Flag parsing | github.com/spf13/pflag (via Cobra) |
| Colored output | github.com/fatih/color |
| Table output | github.com/olekukonko/tablewriter |
| Interactive prompts | github.com/charmbracelet/bubbletea |
| Version injection | go build -ldflags |
| Distribution | goreleaser |
Project Structure
Organize CLI commands in cmd/myapp/ with one file per command. Keep main.go minimal — it only calls Execute().
What ships with it
13 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.
- assets/examples/args.go 1020 B
- assets/examples/cli_test.go 1.2 KB
- assets/examples/completion.go 1.6 KB
- assets/examples/config.go 1.7 KB
- assets/examples/exit_codes.go 494 B
- assets/examples/flags.go 1.3 KB
- assets/examples/main.go 120 B
- assets/examples/output.go 1.7 KB
- assets/examples/root.go 1.8 KB
- assets/examples/serve.go 735 B
- assets/examples/signal.go 831 B
- assets/examples/version.go 871 B
- evals/evals.json 16 KB
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 · 206 lines · 126 tokens per session scan A 518891186ce2
golang-cli is a skill published in the GitHub repository alexastrum/skl (10 stars, last pushed 4mo ago), licensed MIT. It adds 126 tokens to every session and 2,329 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 97% identical to golang-cli, differing in 6 lines, and is treated as a copy.
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