agentmods.dev

colgen

colgen is a skill for Claude Code from vmkteam/claude-plugins. It costs 87 tokens per session (1,768 once invoked), scanned A, original, MIT.

A Go code generator that creates list types and helper methods for your structs from comments in collection.go. Go is a programming language, and the generated code can also convert values between package layers.

In plain words
What is it for?
Use it when maintaining collection.go, defining list types such as NewsList, or converting structs between packages and application layers.
Why use it?
It removes repetitive work when building collections, indexes, groups, counts, and relationships for Go structs. The source code stays focused on the data model while the generator creates the repeated helpers.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the vmkteam-developer plugin — 35 skills shipped together

not rated 7repo changed 6d ago A scan 87 tokens original MIT

Good fit Use it when maintaining collection.go, defining list types such as NewsList, or converting structs between packages and application layers.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/vmkteam/claude-plugins/colgen
View source ↗ vmkteam/claude-plugins
Install

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.

Any agent
npx skills add vmkteam/claude-plugins --skill colgen
Clone the repo
git clone --depth 1 https://github.com/vmkteam/claude-plugins

Made for: Claude Code.

Or install vmkteam-developer, the plugin that ships this one along with the rest of its 35 skills.

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 colgen

README.md
[![agentmods](https://agentmods.dev/badge/skills/vmkteam/claude-plugins/colgen/github.svg)](https://agentmods.dev/skills/vmkteam/claude-plugins/colgen)
Your own site
<a href="https://agentmods.dev/skills/vmkteam/claude-plugins/colgen"><img src="https://agentmods.dev/badge/skills/vmkteam/claude-plugins/colgen/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 colgen

Your own site · 80×15
<a href="https://agentmods.dev/skills/vmkteam/claude-plugins/colgen"><img src="https://agentmods.dev/badge/skills/vmkteam/claude-plugins/colgen.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 87 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,768 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 $0.00087 $0.01768
Opus 5.5 $0.00035 $0.00707
Sonnet 5.5 $0.00017 $0.00354
Haiku 4.5 $0.00009 $0.00177

Measured 6d ago against content hash 4fbe36fe7117, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

colgen 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 6d 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.

plugins/developer/skills/colgen/SKILL.md · 133 lines

How it starts

The opening of the file, as written. The whole thing — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Colgen

Upstream: https://github.com/vmkteam/colgen Docs: https://vmkteam.dev/colgen/

Генерирует коллекции (XxxList []Xxx) с утилитарными методами из директив в collection.go. Также: inline-сниппеты, LLM-режимы.

Директивы

  • //go:generate colgen — запуск генератора в файле
  • //colgen:News,Tag — базовая генерация типов + IDs() + Index() (если есть поле ID)
  • //colgen:News:<Method>[,<Method>...] — дополнительные методы
  • Код должен компилироваться перед запуском — парсинг через AST

Методы

Директива Эффект
NewsID NewsIDs() []int (если поле ID нестандартное)
Index(Field) IndexByField() map[T]News
UniqueField уникальные значения (поддерживает *T c nil-check)
Count(Field) CountByField(v) int
Group(Field) GroupByField() map[T]NewsList; для []T — fan-out
Fill(Target,Junction) заполняет связи; режим определяется типом junction
Cast(Interface) Interfaces() []Interface через pointer receiver
Map(pkg) / MapP(pkg) конструктор NewNewsList(in []pkg.News) NewsList
map/mapp то же в lowercase (приватный конструктор)

Поведение <Field> по типу

  • Скаляр StatusID int → StatusIDs() []int
  • Слайс TagIDs []int → flatten в []int (не [][]int)
  • Указатель Author *Author → []Author с nil-check и разыменованием

Fill — определение режима

Fill(Tags,TagIDs) где TagIDs []int → many-to-many через related.Index() + append Fill(Author,AuthorID) где AuthorID *int → one-to-one с nil-check Все FillXxx возвращают ll для чейнинга: news.FillTags(tags).FillAuthor(authors)

Map / MapP — конвертеры между слоями

//go:generate colgen -imports=newsportal/pkg/db
//colgen:News,Tag
//colgen:News:UniqueTagIDs,Map(db)

Требования:

  • Проект должен содержать дженерики Map[T,M] / MapP[T,M] (pointer-версия)
  • MapP(db) — если NewNews принимает *db.News
  • map/mapp (lowercase) — приватные конструкторы
  • Разное имя в db-слое: Map(db.News) (полный путь)
  • Структура не в базовой директиве → конструктор вернёт []News вместо NewsList
  • Другой пакет для Map/MapP: -funcpkg=<pkg> + имя пакета в -imports через запятую. Дженерики Map/MapP живут в пакете домена, API-пакеты берут их оттуда, а не заводят свои: 
    // pkg/rpc/collection.go (vmkteam-reviewer)
//go:generate colgen -funcpkg=reviewer -imports=reviewsrv/pkg/reviewer
//colgen:Review:mapp(reviewer)

Read the full file on GitHub · 133 lines

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. 6d ago Changed · +10 lines · +55 tokens per session 4fbe36fe7117
  2. 23d ago Changed · +13 lines b442df8d2c37
  3. 1mo ago First seen · 110 lines · 32 tokens per session scan A 309b73c8525d

Subscribe to this mod's changes

colgen is a skill published in the GitHub repository vmkteam/claude-plugins (7 stars, last pushed 6d ago), licensed MIT. It adds 87 tokens to every session and 1,768 once invoked, about $0.0003 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 2026-08-31.

GoLanguages
Related

Other skills, from other repositories

golang-testing

Go testing best practices including table-driven tests, test helpers, benchmarking, race detection, coverage analysis, and integration testing patterns. Use when writing or improving Go tests.

affaan-m/ECC · 37 tokens

golang-patterns

Go-specific design patterns and best practices including functional options, small interfaces, dependency injection, concurrency patterns, error handling, and package organization. Use when working with Go code to apply idiomatic Go patterns.

affaan-m/ECC · 45 tokens

ax-go-agent-optimize

Use when writing Go code with github.com/ax-llm/ax/packages/go for agent optimization, verified agent-playbook evolution, evaluators, judges, optimizer artifacts, BootstrapFewShot, and GEPA.

ax-llm/ax · 51 tokens

golang-testing

Production-ready Golang tests — table-driven tests, testify suites and mocks, parallel tests, fuzzing, fixtures, goroutine leak detection with goleak, snapshot testing, code coverage, integration tests, idiomatic test naming. Use when writing or reviewing Go tests, choosing a testing approach, setting up Go test CI…

samber/cc-skills-golang · 115 tokens

golang-uber-fx

Golang application framework using uber-go/fx — fx.New, fx.Provide, fx.Invoke, fx.Module, fx.Lifecycle hooks, fx.Annotate (name/group/As), fx.Decorate, fx.Supply, fx.Replace, fx.WithLogger, and signal-aware Run(). Apply when using or adopting uber-go/fx, when the codebase imports go.uber.org/fx, or when wiring…

samber/cc-skills-golang · 122 tokens

golang-samber-oops

Structured error handling in Golang with samber/oops — error builders, stack traces, error codes, error context, error wrapping, error attributes, user-facing vs developer messages, panic recovery, and logger integration. Apply when using or adopting samber/oops, or when the codebase already imports…

samber/cc-skills-golang · 74 tokens