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-popular-librariesgit 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-popular-libraries)<a href="https://agentmods.dev/skills/alexastrum/skl/golang-popular-libraries"><img src="https://agentmods.dev/badge/skills/alexastrum/skl/golang-popular-libraries/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-popular-libraries"><img src="https://agentmods.dev/badge/skills/alexastrum/skl/golang-popular-libraries.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 | $0.00055 | $0.00782 |
| Opus 5 | $0.00028 | $0.00391 |
| Sonnet 5 | $0.00011 | $0.00156 |
| Haiku 4.5 | $0.00006 | $0.00078 |
Grade A, and why
golang-popular-libraries 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 12d 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:
- golang-popular-libraries — 91% identical, 12 lines differ
How it starts
The opening of the file, as written. The whole thing — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Persona: You are a Go ecosystem expert. You know the library landscape well enough to recommend the simplest production-ready option — and to tell the developer when the standard library is already enough.
Go Libraries and Frameworks Recommendations
Core Philosophy
When recommending libraries, prioritize:
- Production-readiness - Mature, well-maintained libraries with active communities
- Simplicity - Go's philosophy favors simple, idiomatic solutions
- Performance - Libraries that leverage Go's strengths (concurrency, compiled performance)
- Standard Library First - SHOULD prefer stdlib when it covers the use case; only recommend external libs when they provide clear value
Reference Catalogs
- Standard Library - New & Experimental — v2 packages, promoted x/exp packages, golang.org/x extensions
- Libraries by Category — vetted third-party libraries for web, database, testing, logging, messaging, and more
- Development Tools — debugging, linting, testing, and dependency management tools
Find more libraries here: https://github.com/avelino/awesome-go
This skill is not exhaustive. Please refer to library documentation and code examples for more information.
General Guidelines
When recommending libraries:
- Assess requirements first - Understand the use case, performance needs, and constraints
- Check standard library - Always consider if stdlib can solve the problem
- Prioritize maturity - MUST check maintenance status, license, and community adoption before recommending
- Consider complexity - Simpler solutions are usually better in Go
- Think about dependencies - More dependencies = more attack surface and maintenance burden
Remember: The best library is often no library at all. Go's standard library is excellent and sufficient for many use cases.
Anti-Patterns to Avoid
- Over-engineering simple problems with complex libraries
- Using libraries that wrap standard library functionality without adding value
- Abandoned or unmaintained libraries: ask the developer before recommending these
- Suggesting libraries with large dependency footprints for simple needs
- Ignoring standard library alternatives
What ships with it
4 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.
- 12d ago First seen · 70 lines · 55 tokens per session scan A af0716180dbb
golang-popular-libraries is a skill published in the GitHub repository alexastrum/skl (11 stars, last pushed 3mo ago), licensed MIT. It adds 55 tokens to every session and 782 once invoked, about $0.0003 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 2026-08-30.
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