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kronk: Skill for Claude Code

.agents/default/skills/use-modern-go/SKILL.md

use-modern-go is a skill for Claude Code, Codex from ardanlabs/kronk. It costs 38 tokens per session (329 once invoked), scanned A, original, Apache-2.0.

A guide for applying the Go language features and style rules supported by a project's Go version. It provides scripts to detect those rules and instructions for modernising existing code.

In plain words
What is it for?
Use it when creating, changing, reviewing, or modernising Go code, including running the project's version-specific guidance and, where applicable, go fix.
Why use it?
It prevents code from using Go features newer than the project supports. It also makes the required checks explicit before writing, editing, or reviewing Go files.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

This is ardanlabs/kronk's own configuration. It tells Claude Code and Codex how to work on kronk itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything kronk configures →

not rated 864repo +6 yesterday A scan 38 tokens original Apache-2.0
View source ↗ ardanlabs/kronk kronkai.com
Reuse

Borrowing it

Nothing to install: this file belongs to ardanlabs/kronk. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/ardanlabs/kronk/main/.agents/default/skills/use-modern-go/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/ardanlabs/kronk

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for use-modern-go

README.md
[![agentmods](https://agentmods.dev/badge/skills/ardanlabs/kronk/use-modern-go/github.svg)](https://agentmods.dev/skills/ardanlabs/kronk/use-modern-go)
Your own site
<a href="https://agentmods.dev/skills/ardanlabs/kronk/use-modern-go"><img src="https://agentmods.dev/badge/skills/ardanlabs/kronk/use-modern-go/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.

agentmods 80×15 button for use-modern-go

Your own site · 80×15
<a href="https://agentmods.dev/skills/ardanlabs/kronk/use-modern-go"><img src="https://agentmods.dev/badge/skills/ardanlabs/kronk/use-modern-go.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 38 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 329 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00038 $0.00329
Opus 5.5 $0.00015 $0.00132
Sonnet 5.5 $0.00008 $0.00066
Haiku 4.5 $0.00004 $0.00033

Measured 2d ago against content hash 083d9dc57bdd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

use-modern-go 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 2d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/guidelines.ps1, scripts/guidelines.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

.agents/default/skills/use-modern-go/SKILL.md · 21 lines

What it actually says

Modern Go

Before writing Go, run on the file/dir being edited (<skill> = this file's dir):

  • sh: sh <skill>/scripts/guidelines.sh <path>
  • PowerShell: pwsh -NoProfile -ExecutionPolicy Bypass -File <skill>/scripts/guidelines.ps1 <path> (no pwsh: use powershell, Windows PowerShell 5.1)

It prints go 1.XX + the guidelines for that version. Read all of it, unfiltered. Never detect the version yourself; re-run per module.

  • go 1.XX: say only "This project is using Go X.XX, so I'll use modern Go features up to that version. Let me know to target a different one."
  • Otherwise: say "Could not detect Go version.", ask "Which Go version should I target?" [1.26] / [1.27], re-run with --go X.Y (PowerShell: -Go X.Y).

Apply every guideline; never use newer features. "details X" = section X of <skill>/references/details.md.

Modernizing existing code: if the installed toolchain (go version) is 1.26+, run go fix on its packages before reading their files (details "go fix"); otherwise apply the guidelines by hand.

Files

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.

Changes

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.

  1. 2d ago First seen · 21 lines · 38 tokens per session scan A 083d9dc57bdd

Subscribe to this mod's changes

use-modern-go is a skill published in the GitHub repository ardanlabs/kronk (864 stars, last pushed yesterday), licensed Apache-2.0. It adds 38 tokens to every session and 329 once invoked, about $0.0002 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 2026-11-04.

GoLanguageslocal-ailocal-inference
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