What is mobile-offline-support?

A guide to building mobile apps that continue working without an internet connection and synchronize changes when the connection returns.

Use it to store data locally, cache content, sync in the background, and resolve conflicts with AsyncStorage, Realm, or SQLite.

It prevents poor connectivity from blocking users and helps handle differences between local device data and server data.

mobile-offline-support — Skill for Claude Code and Codex by aj-geddes

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 mobile-offline-support

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/mobile-offline-support/github.svg)](https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/mobile-offline-support)

Your own site

<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/mobile-offline-support"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/mobile-offline-support/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/mobile-offline-support"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/mobile-offline-support.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 565 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 16 Sept 2026
Snyk pass 16 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	$0.00034	$0.00565
Opus 5.5	$0.00014	$0.00226
Sonnet 5.5	$0.00007	$0.00113
Haiku 4.5	$0.00003	$0.00056

Measured 2mo ago against content hash 9ff606a3b527, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mobile-offline-support 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.

skills/mobile-offline-support/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

Design offline-first mobile applications that provide seamless user experience regardless of connectivity.

When to Use

Building apps that work without internet connection
Implementing seamless sync when connectivity returns
Handling data conflicts between device and server
Reducing server load with intelligent caching
Improving app responsiveness with local storage

Quick Start

Minimal working example:

import AsyncStorage from '@react-native-async-storage/async-storage';
import NetInfo from '@react-native-community/netinfo';

class StorageManager {
  static async saveItems(items) {
    try {
      await AsyncStorage.setItem(
        'items_cache',
        JSON.stringify({ data: items, timestamp: Date.now() })
      );
    } catch (error) {
      console.error('Failed to save items:', error);
    }
  }

  static async getItems() {
    try {
      const data = await AsyncStorage.getItem('items_cache');
      return data ? JSON.parse(data) : null;
    } catch (error) {
      console.error('Failed to retrieve items:', error);
      return null;
    }
  }

// ... (see reference guides for full implementation)

Reference Guides

Detailed implementations in the references/ directory:

Guide	Contents
React Native Offline Storage	React Native Offline Storage
iOS Core Data Implementation	iOS Core Data Implementation
Android Room Database	Android Room Database

Best Practices

✅ DO

Implement robust local storage
Use automatic sync when online
Provide visual feedback for offline status
Queue actions for later sync
Handle conflicts gracefully
Cache frequently accessed data
Implement proper error recovery
Test offline scenarios thoroughly
Use compression for large data
Monitor storage usage

Read the full file on GitHub · 101 lines

Files

What ships with it

4 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 · 34 tokens per session scan A 9ff606a3b527

Subscribe to this mod's changes

mobile-offline-support is a skill published in the GitHub repository aj-geddes/useful-ai-prompts (376 stars, last pushed 8mo ago), licensed MIT. It adds 34 tokens to every session and 565 once invoked, about $0.0001 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 2026-09-03.

Databases Mobile Redis and cache

mobile-offline-support next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
mobile-offline-supportaj-geddes/useful-ai-prompts	Skill	376	8mo ago	MIT	A	34	Claude Code, Codex
mobile-storage-sqlite-powersyncagents-inc/skills	Skill	26	11d ago	MIT	A	40	Claude Code, Codex
couchbaseG1Joshi/Agent-Skills	Skill	15	1mo ago	MIT	A	46	Claude Code, Codex
offline-first-expertJosephSanjaya/skills	Skill	5	8d ago	MIT	A	57	Claude Code, Codex
flutter-storageyendangn/flutter-app-builder	Skill	6	4mo ago	MIT	A	62	Claude Code, Codex
riverpod-offlineserverpod/skills-registry	Skill	10	8mo ago	BSD-3-Clause	A	70	Claude Code, Codex
ionic-offline-firstDiegoVilla27/agents-ai-store	Skill	2	1mo ago	none	A	35	Claude Code, Codex

mobile-offline-support