What is android-kotlin-development?

A guide to building native Android apps in Kotlin, a programming language designed for Android, with Jetpack libraries and Compose for user interfaces.

Use it to build Android screens, call APIs with Retrofit, store data with Room, navigate between screens, and organize code with MVVM, a pattern that separates display logic from application data.

It gives structure for organizing Android apps and connecting screens to web services and local data.

android-kotlin-development — Skill by aj-geddes/useful-ai-prompts

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 aj-geddes/useful-ai-prompts --skill android-kotlin-development

Clone the repo

git clone --depth 1 https://github.com/aj-geddes/useful-ai-prompts

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/android-kotlin-development/github.svg)](https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/android-kotlin-development)

Your own site

<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/android-kotlin-development"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/android-kotlin-development/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/android-kotlin-development"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/android-kotlin-development.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 597 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. Third-party audits

Socket pass 15 Sept 2026
Snyk pass 15 Sept 2026

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00038	$0.00597
Opus 5.5	$0.00015	$0.00239
Sonnet 5.5	$0.00008	$0.00119
Haiku 4.5	$0.00004	$0.00060

Measured 2mo ago against content hash 686596fd8a40, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

android-kotlin-development 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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/validate-api.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.

skills/android-kotlin-development/SKILL.md · 101 lines

How it starts

The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Overview

Build robust native Android applications using Kotlin with modern architecture patterns, Jetpack libraries, and Compose for declarative UI.

When to Use

Creating native Android applications with best practices
Using Kotlin for type-safe development
Implementing MVVM architecture with Jetpack
Building modern UIs with Jetpack Compose
Integrating with Android platform APIs

Quick Start

Minimal working example:

// Models
data class User(
  val id: String,
  val name: String,
  val email: String,
  val avatarUrl: String? = null
)

data class Item(
  val id: String,
  val title: String,
  val description: String,
  val imageUrl: String? = null,
  val price: Double
)

// API Service with Retrofit
interface ApiService {
  @GET("/users/{id}")
  suspend fun getUser(@Path("id") userId: String): User

  @PUT("/users/{id}")
  suspend fun updateUser(
    @Path("id") userId: String,
    @Body user: User
// ... (see reference guides for full implementation)

Reference Guides

Detailed implementations in the references/ directory:

Guide	Contents
Models & API Service	Models & API Service
MVVM ViewModels with Jetpack	MVVM ViewModels with Jetpack
Jetpack Compose UI	Jetpack Compose UI

Best Practices

✅ DO

Use Kotlin for all new Android code
Implement MVVM with Jetpack libraries
Use Jetpack Compose for UI development
Leverage coroutines for async operations
Use Room for local data persistence
Implement proper error handling
Use Hilt for dependency injection
Use StateFlow for reactive state
Test on multiple device types
Follow Android design guidelines

Read the full file on GitHub · 101 lines

Files

What ships with it

5 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.

2mo ago First seen · 101 lines · 38 tokens per session scan A 686596fd8a40

Subscribe to this mod's changes

android-kotlin-development is a skill published in the GitHub repository aj-geddes/useful-ai-prompts (376 stars, last pushed 8mo ago), licensed MIT. It adds 38 tokens to every session and 597 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 2026-08-30.

Kotlin and Swift Languages Mobile

android-kotlin-development next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
android-kotlin-developmentaj-geddes/useful-ai-prompts	Skill	376	8mo ago	MIT	A	38	Claude Code, Codex
wear-compose-m3android/skills	Skill	10k	yesterday	Apache-2.0	A	91	Claude Code
ink-custom-brush-builderandroid/skills	Skill	10k	yesterday	Apache-2.0	A	159	Claude Code
kotlin-specialistJeffallan/claude-skills	Skill	12k	7d ago	MIT	A	86	Claude Code
swiftui-devOrkas-AI/Orkas	Skill	9.0k	yesterday	MIT	A	3	Claude Code, Codex
build-android-binarymicrosoft/power-platform-skills	Skill	1.1k	yesterday	MIT	A	150	Claude Code
kotlin-androidericrisco/rsc-harness	Skill	503	2d ago	MIT	A	78	Claude Code, Codex

android-kotlin-development