Kotlin Api Design

CommunityPopular

chrisbanes

kotlin-api-design

Use when designing or reviewing Kotlin function ownership, member or extension functions, factories, single-field domain types, value classes, data classes, Kotlin Multiplatform expect/actual declarations, or platform service boundaries.

Overview

Publisher	chrisbanes
Repository	`skills`
Skill name	`kotlin-api-design`
Stars	1.1K
Forks	53
Bundled files	3
License	Apache-2.0
Links	Skill source Repository

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
3 bundled files
Scripts, templates, and references the model can read while it works. Files are read-only and never executed.
Open source
Published by chrisbanes on GitHub. Read the source before you install it.

Installation

Install the Kotlin Api Design AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
https://github.com/chrisbanes/skills/tree/main/skills/kotlin-api-design
Enable the skill in any chat where you want it available.

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/chrisbanes/skills.git /tmp/skills
mkdir -p .claude/skills
cp -r /tmp/skills/skills/kotlin-api-design .claude/skills/kotlin-api-design

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Kotlin Api Design in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Kotlin Api Design on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Kotlin Api Design is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Kotlin API design

Core principle

Place behavior, types, and platform seams where their meaning is clearest to callers; use the smallest public abstraction that preserves domain language and platform independence.

Procedure

Name the domain concept, its owning type or module, and the callers that need to depend on it.
Choose function ownership before adding an extension, factory, helper, or service layer.
When reviewing a public mapping over a sealed result, name every caller-visible outcome. Flag a catch-all else that hides a subtype and recommend explicit subtype branches so the contract stays exhaustive and preserves smart casts.
Represent a single-field domain concept with the smallest type that preserves its semantic and interop contract.
Keep shared code semantic; put native SDK and platform details behind an interface or a narrowly justified expect/actual boundary.
Read the focused reference for the selected decision below.
Finish when the public surface states domain intent, platform details remain at leaves, and callers do not depend on convenience abstractions with no clear owner.

Topic router

Signal	Read
Member vs top-level, extension, factory, service, or receiver choice	Function ownership
Primitive obsession, one-field domain type, `@JvmInline value class`, data class, interop, or Compose stability	Value classes
Source sets, platform services, native SDKs, files, sensors, permissions, Compose Multiplatform interop, or expect/actual	Multiplatform boundaries
Branching, guard-condition shape, sealed-result mapping, or a catch-all `else`	Kotlin control flow

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

Frequently asked questions

What does the Kotlin Api Design AI skill do?

Why use Kotlin Api Design on TypingMind?

Because you install it once and use it with any model. Kotlin Api Design is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Kotlin Api Design in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/chrisbanes/skills/tree/main/skills/kotlin-api-design. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Kotlin Api Design?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Kotlin Api Design?

As many as you like. As long as a model supports skills, you can use Kotlin Api Design with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Kotlin Api Design AI skill free?

Yes. It is published on GitHub by chrisbanes under the Apache-2.0 license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

Kotlin API design

Core principle

Procedure

Topic router

Bundled files

Frequently asked questions

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