Agent skill

Android Data Layer and Room in KMP

by rcosteira79 in rcosteira79/android-skills

Sets out the repository pattern's error-propagation model for Android and Kotlin Multiplatform, plus the Room setup for commonMain.

MITAuto-check passedMobile

Install Android Data Layer and Room in KMP

skills CLI

$ npx skills add rcosteira79/android-skills --skill android-data-layer -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install rcosteira79/android-skills android-data-layer --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/rcosteira79/android-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/android-skills/skills/android-data-layer .claude/skills/android-data-layer && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "android-data-layer" agent skill from https://github.com/rcosteira79/android-skills/tree/main/plugins/android-skills/skills/android-data-layer into .claude/skills/android-data-layer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-data-layer", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/rcosteira79/android-skills/tree/main/plugins/android-skills/skills/android-data-layer

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add rcosteira79/android-skills --skill android-data-layer -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install rcosteira79/android-skills android-data-layer --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/rcosteira79/android-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/android-skills/skills/android-data-layer .agents/skills/android-data-layer && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "android-data-layer" agent skill from https://github.com/rcosteira79/android-skills/tree/main/plugins/android-skills/skills/android-data-layer into .agents/skills/android-data-layer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-data-layer", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add rcosteira79/android-skills --skill android-data-layer -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install rcosteira79/android-skills android-data-layer --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/rcosteira79/android-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/android-skills/skills/android-data-layer .cursor/skills/android-data-layer && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "android-data-layer" agent skill from https://github.com/rcosteira79/android-skills/tree/main/plugins/android-skills/skills/android-data-layer into .cursor/skills/android-data-layer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-data-layer", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/rcosteira79/android-skills.git --path plugins/android-skills/skills/android-data-layer

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add rcosteira79/android-skills --skill android-data-layer -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install rcosteira79/android-skills android-data-layer --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/rcosteira79/android-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/android-skills/skills/android-data-layer .gemini/skills/android-data-layer && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "android-data-layer" agent skill from https://github.com/rcosteira79/android-skills/tree/main/plugins/android-skills/skills/android-data-layer into .gemini/skills/android-data-layer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-data-layer", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install rcosteira79/android-skills android-data-layer

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add rcosteira79/android-skills --skill android-data-layer -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/rcosteira79/android-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/android-skills/skills/android-data-layer .github/skills/android-data-layer && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "android-data-layer" agent skill from https://github.com/rcosteira79/android-skills/tree/main/plugins/android-skills/skills/android-data-layer into .github/skills/android-data-layer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-data-layer", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add rcosteira79/android-skills --skill android-data-layer -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install rcosteira79/android-skills android-data-layer --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/rcosteira79/android-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/android-skills/skills/android-data-layer .opencode/skills/android-data-layer && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "android-data-layer" agent skill from https://github.com/rcosteira79/android-skills/tree/main/plugins/android-skills/skills/android-data-layer into .opencode/skills/android-data-layer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-data-layer", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: android-data-layer
GitHub stars: 151
Token cost: ~1.2k tokens
SKILL.md length: 342 words
Files: 1
Skills in repo: 21
Repo updated: Sep 19, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Sets out the repository pattern's error-propagation model for Android and Kotlin Multiplatform, plus the Room setup for commonMain.

Works in 4 steps: Data sources throw platform/library… → Repository is the error boundary — catch… → Use cases (when present) are the Result… → …
Designing how repository errors reach the ViewModel in an Android app
SKILL.md covers Error propagation — the… and Room in KMP (commonMain)
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

The data layer's public API is a set of repository interfaces, and its internals never leak upward. The core of this skill is a layered error model: data sources throw platform exceptions such as IOException, HttpException or SQLiteException, the repository is the error boundary and remaps them to a sealed DataError hierarchy, and the ViewModel never sees raw platform types. Without a domain layer the repository returns Result directly; with one, the repository throws DataError and the use case turns it into a Result with a domain error model.

It also covers Room in commonMain, which has been KMP-stable since 2.7.0. The shared setup differs from Android-only Room in three places: @ConstructedBy on the database paired with an expect object, BundledSQLiteDriver from androidx.sqlite to pin one SQLite version across targets, and per-target KSP configuration. Room types default to an Entity suffix unless the project already has a convention. Related skills handle Retrofit wiring and overall app architecture.

When your agent uses it

Designing how repository errors reach the ViewModel in an Android app
Deciding where Result is created with or without a domain layer
Setting up Room in commonMain for Kotlin Multiplatform
Replacing leaked IOException or HttpException handling with a DataError type

Example prompts

“Refactor our ArticleRepository so network and database exceptions become a sealed DataError.”
“We added use cases. Where should Result be created and who catches DataError?”
“Set up Room in commonMain with BundledSQLiteDriver for Android and iOS.”

Requirements

An Android or Kotlin Multiplatform project

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

Data sources throw platform/library exceptions (IOException, HttpException, SQLiteException).
Repository is the error boundary — catch those and remap to DataError; never let raw platform types leak. Without a domain layer (simple…
Use cases (when present) are the Result boundary — the repository instead throws DataError, and the use case catches it and returns Result…
ViewModels handle Result and map it to UI state (explicit loading / success / error).

What it can do on your machine

Read from SKILL.md and the folder at commit 0f9af5a. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are kotlin).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Android Data Layer and Room in KMP loads about 1.2k tokens when it runs. Until then it costs about 78 tokens; SKILL.md has 342 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~78
When it runs · the whole SKILL.md, loaded when a task matches: ~1.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from rcosteira79/android-skills at commit 0f9af5a, republished under its MIT licence (© rcosteira79). 342 words, ~1,187 tokens.

Download SKILL.mdSave it as .claude/skills/android-data-layer/SKILL.md (or your agent's skills folder).

name: android-data-layer
description: Use when implementing the data layer in Android or KMP — the Repository pattern's layered error-propagation model (repository as the error boundary, sealed DataError, Result placement with and without a domain layer) and Room in commonMain (@ConstructedBy, BundledSQLiteDriver, per-target KSP).

Android Data Layer

The data layer coordinates data from multiple sources; its public API is repository interfaces, and its internals (DAOs, API services, DTOs) never leak upward. This skill is the canonical home for the error-propagation model, plus the KMP-Room setup. Related: android-skills:android-retrofit (Retrofit service/OkHttp/Hilt wiring), android-skills:android-dev (overall app architecture).

Error propagation — the layered model

The goal: data-layer errors (IOException / HttpException / SQLiteException) must never reach the ViewModel. Map them to a domain error type at the repository boundary. If the project already has an error convention, match it; otherwise a sealed DataError hierarchy is a reasonable default:

kotlin

sealed class DataError(message: String, cause: Throwable? = null) : Exception(message, cause) {
    class Network(cause: Throwable) : DataError("Network error", cause)
    class Server(val code: Int, message: String?) : DataError("Server error $code: $message")
    class Local(cause: Throwable) : DataError("Local storage error", cause)
}

// repository = error boundary: catch platform exceptions, return Result<T> (no domain layer) or throw DataError (with one)
suspend fun refreshNews(): Result<Unit> = withContext(io) {
    try { newsDao.insertAll(newsApi.fetchLatest().map(NewsDto::toEntity)); Result.success(Unit) }
    catch (e: IOException) { Result.failure(DataError.Network(e)) }
    catch (e: HttpException) { Result.failure(DataError.Server(e.code(), e.message())) }
}

The boundary moves outward by one layer when a domain layer exists:

Data sources throw platform/library exceptions (IOException, HttpException, SQLiteException).
Repository is the error boundary — catch those and remap to DataError; never let raw platform types leak. Without a domain layer (simple MVVM): the repository returns Result<T> directly and the ViewModel handles it without knowing about platform exceptions.
Use cases (when present) are the Result boundary — the repository instead throws DataError, and the use case catches it and returns Result<T> with a domain-specific error model. Use cases never catch platform exception types.
ViewModels handle Result<T> and map it to UI state (explicit loading / success / error).

(Default to the Entity suffix — ArticleEntity — for Room types; match an existing convention such as a Cached prefix if the project already uses one.)

Room in KMP (`commonMain`)

Room has been KMP-stable since 2.7.0. The shared setup differs from the Android-only setup in three places:

@ConstructedBy(...) on the @Database, paired with an expect object Room generates per-platform actuals for.
BundledSQLiteDriver (from androidx.sqlite:sqlite-bundled) — pins the same SQLite version across Android/iOS/JVM/web (Android's system SQLite drifts between API levels and devices).
setQueryCoroutineContext(Dispatchers.IO) — Android Room defaults this; KMP doesn't.

kotlin

// commonMain
@Database(entities = [ArticleEntity::class], version = 1, exportSchema = true)
@ConstructedBy(AppDatabaseConstructor::class)
abstract class AppDatabase : RoomDatabase() { abstract fun articleDao(): ArticleDao }

@Suppress("KotlinNoActualForExpect")
expect object AppDatabaseConstructor : RoomDatabaseConstructor<AppDatabase>

fun getRoomDatabase(builder: RoomDatabase.Builder<AppDatabase>): AppDatabase =
    builder.setDriver(BundledSQLiteDriver()).setQueryCoroutineContext(Dispatchers.IO).build()

Each platform provides its own builder — Android Room.databaseBuilder(context, AppDatabase::class.java, "app.db"); iOS/JVM Room.databaseBuilder<AppDatabase>(databasePath = …). KSP must be wired per target (ksp(libs.androidx.room.compiler) is Android-only):

kotlin

dependencies {
    add("kspAndroid", libs.androidx.room.compiler)
    add("kspIosArm64", libs.androidx.room.compiler)
    add("kspIosSimulatorArm64", libs.androidx.room.compiler)
    // … one per target
}
room { schemaDirectory("$projectDir/schemas") }   // export the schema for migration-history tracking

For pure-Android projects, skip @ConstructedBy and call Room.databaseBuilder(context, AppDatabase::class.java, "app.db") directly — Room behaves identically; the KMP setup is opt-in when the data layer must live in commonMain.

Files

Just SKILL.md in plugins/android-skills/skills/android-data-layer of rcosteira79/android-skills.

Open the folder on GitHubat commit 0f9af5a

Compare with similar skills

Android Data Layer and Room in KMP next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Android Data Layer and Room in KMP compared with similar skills
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Android Data Layer and Room in KMP this skillrcosteira79/android-skills	151	—	~1.2k	Automated safety check: Pass	MIT	19 days ago
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Android Clean Architectureaffaan-m/ECC	275k	4 repos	~2.2k	Automated safety check: Pass	MIT	3 days ago
Quality Test Pilotnekomangaorg/Neko	2.8k	—	~1.1k	Automated safety check: Pass	Apache-2.0	today
Architecture Overclocknekomangaorg/Neko	2.8k	—	~1.4k	Automated safety check: Pass	Apache-2.0	today
Architecture Renovatornekomangaorg/Neko	2.8k	—	~1.2k	Automated safety check: Pass	Apache-2.0	today

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Works with

Questions about Android Data Layer and Room in KMP

What does Android Data Layer and Room in KMP do?

Sets out the repository pattern's error-propagation model for Android and Kotlin Multiplatform, plus the Room setup for commonMain. The data layer's public API is a set of repository interfaces, and its internals never leak upward. The core of this skill is a layered error model: data sources throw platform exceptions such as IOException, HttpException or SQLiteException, the repository is the error boundary and remaps them to a sealed DataError hierarchy, and the ViewModel never sees raw platform types.

When should I use Android Data Layer and Room in KMP?

Android Data Layer and Room in KMP fits situations like: designing how repository errors reach the ViewModel in an Android app; deciding where Result is created with or without a domain layer; setting up Room in commonMain for Kotlin Multiplatform; replacing leaked IOException or HttpException handling with a DataError type.

How do I install Android Data Layer and Room in KMP in Claude Code?

Run `npx skills add rcosteira79/android-skills --skill android-data-layer -a claude-code`. Or copy the skill folder (plugins/android-skills/skills/android-data-layer in rcosteira79/android-skills) into .claude/skills/android-data-layer in your project. Claude Code loads it when a task matches its description.

How do I install Android Data Layer and Room in KMP in Codex?

Run `npx skills add rcosteira79/android-skills --skill android-data-layer -a codex`. Or copy the skill folder (plugins/android-skills/skills/android-data-layer in rcosteira79/android-skills) into .agents/skills/android-data-layer in your project. Codex loads it when a task matches its description.

Can I use Android Data Layer and Room in KMP in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add rcosteira79/android-skills --skill android-data-layer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/android-data-layer, .gemini/skills/android-data-layer, .github/skills/android-data-layer and .opencode/skills/android-data-layer in your project.

What does Android Data Layer and Room in KMP need to run?

SKILL.md names no scripts, command-line tools or credentials: Android Data Layer and Room in KMP is instructions for the agent only. Our summary lists: An Android or Kotlin Multiplatform project.

Does Android Data Layer and Room in KMP access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Android Data Layer and Room in KMP safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Android Data Layer and Room in KMP use?

Android Data Layer and Room in KMP is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Android Data Layer and Room in KMP use?

About 1.2k tokens (SKILL.md is roughly 4.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Android Data Layer and Room in KMP?

Skills that share tags, products or a category with Android Data Layer and Room in KMP: Android Clean Architecture (affaan-m/ECC, 275k stars), Android Clean Architecture (affaan-m/ECC, 275k stars), Quality Test Pilot (nekomangaorg/Neko, 2.8k stars) and Architecture Overclock (nekomangaorg/Neko, 2.8k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Android Data Layer and Room in KMP?

rcosteira79 (a GitHub user) maintains it in rcosteira79/android-skills, which has 151 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on September 19, 2026.

Source: rcosteira79/android-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Android Data Layer and Room in KMP

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Android Data Layer

Error propagation — the layered model

Room in KMP (commonMain)

Files

Compare with similar skills

Similar skills

More from rcosteira79/android-skills

Related

Questions about Android Data Layer and Room in KMP

Room in KMP (`commonMain`)