agentmods.dev

data-layer

data-layer is a skill for Claude Code from hanamizuki/solopreneur. It costs 28 tokens per session (444 once invoked), scanned A, a copy of android-data-layer, MIT.

Guidance for an Android data layer that combines a local Room database, a remote Retrofit service, and repositories that coordinate both.

In plain words
What is it for?
Implementing repositories, local entities and data access objects, network calls, synchronization, caching, offline storage, and error handling.
Why use it?
It helps apps show cached data when offline, fetch newer data when possible, and handle network errors without making the user interface manage storage details.

Skill for Claude Code

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

Part of the android-dev plugin — 36 skills, 1 agent shipped together

not rated 156repo +1 3d ago A scan 28 tokens copy · 97% MIT

Good fit Implementing repositories, local entities and data access objects, network calls, synchronization, caching, offline storage, and error handling.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/hanamizuki/solopreneur/data-layer
View source ↗ hanamizuki/solopreneur
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 hanamizuki/solopreneur --skill data-layer
Clone the repo
git clone --depth 1 https://github.com/hanamizuki/solopreneur

Made for: Claude Code.

Or install android-dev, the plugin that ships this one along with the rest of its 36 skills, 1 agent.

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 data-layer

README.md
[![agentmods](https://agentmods.dev/badge/skills/hanamizuki/solopreneur/data-layer/github.svg)](https://agentmods.dev/skills/hanamizuki/solopreneur/data-layer)
Your own site
<a href="https://agentmods.dev/skills/hanamizuki/solopreneur/data-layer"><img src="https://agentmods.dev/badge/skills/hanamizuki/solopreneur/data-layer/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 data-layer

Your own site · 80×15
<a href="https://agentmods.dev/skills/hanamizuki/solopreneur/data-layer"><img src="https://agentmods.dev/badge/skills/hanamizuki/solopreneur/data-layer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 28 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 444 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 97% copy Near-identical to another mod 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 $0.00028 $0.00444
Opus 5.5 $0.00011 $0.00178
Sonnet 5.5 $0.00006 $0.00089
Haiku 4.5 $0.00003 $0.00044

Measured 2mo ago against content hash afc0b3edb7f6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

data-layer 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.

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.

Origin

This is a copy

97% identical to android-data-layer — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

plugins/claude/android-dev/skills/data-layer/SKILL.md · 52 lines

What it actually says

Android Data Layer & Offline-First

Instructions

The Data Layer coordinates data from multiple sources.

1. Repository Pattern

  • Role: Single Source of Truth (SSOT).
  • Logic: The repository decides whether to return cached data or fetch fresh data.
  • Implementation: 
    class NewsRepository @Inject constructor(
    private val newsDao: NewsDao,
    private val newsApi: NewsApi
) {
    // Expose data from Local DB as the source of truth
    val newsStream: Flow<List<News>> = newsDao.getAllNews()

    // Sync operation
    suspend fun refreshNews() {
        val remoteNews = newsApi.fetchLatest()
        newsDao.insertAll(remoteNews)
    }
}

2. Local Persistence (Room)

  • Usage: Primary cache and offline storage.
  • Entities: Define @Entity data classes.
  • DAOs: Return Flow<T> for observable data.

3. Remote Data (Retrofit)

  • Usage: Fetching data from backend.
  • Response: Use suspend functions in interfaces.
  • Error Handling: Wrap network calls in try-catch blocks or a Result wrapper to handle exceptions (NoInternet, 404, etc.) gracefully.

4. Synchronization

  • Read: "Stale-While-Revalidate". Show local data immediately, trigger a background refresh.
  • Write: "Outbox Pattern" (Advanced). Save local change immediately, mark as "unsynced", use WorkManager to push changes to server.

5. Dependency Injection

  • Bind Repository interfaces to implementations in a Hilt Module. 
    @Binds
abstract fun bindNewsRepository(impl: OfflineFirstNewsRepository): NewsRepository
Files

What ships with it

1 file 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. 2mo ago First seen · 52 lines · 28 tokens per session scan A afc0b3edb7f6

Subscribe to this mod's changes

data-layer is a skill published in the GitHub repository hanamizuki/solopreneur (156 stars, last pushed 3d ago), licensed MIT. It adds 28 tokens to every session and 444 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 97% identical to android-data-layer, differing in 2 lines, and is treated as a copy.

DatabasesMobile
Related

data-layer compared with skills from other repositories

data-layer next to 6 skills from other repositories
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data-layerhanamizuki/solopreneurSkill1563d agoMITA28Claude Code
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axiom-audit-core-dataCharlesWiltgen/AxiomSkill1.3kyesterdayMITA27Codex
axiom-audit-swiftdataCharlesWiltgen/AxiomSkill1.3kyesterdayMITA32Codex
boutique-storemergesort/BoutiqueSkill1.1k5d agoMITA52Claude Code
boutique-stored-valuesmergesort/BoutiqueSkill1.1k5d agoMITA68Claude Code