offline-sync

offline-sync is a skill for Claude Code, Codex from makifbaysal/tasktrooper. It costs 50 tokens per session (745 once invoked), scanned A, original, Apache-2.0.

A design and implementation guide for mobile features that must work without a network connection. It stores changes locally, queues them for later, and replays them when the connection returns without applying the same change twice.

In plain words
What is it for?
Use it for offline screens, queued edits, background synchronisation, local storage, reconnect handling, and tests involving lost or unreliable networks.
Why use it?
A network indicator does not prove that a server is reachable, and retries can duplicate a change. This approach keeps the interface honest when connections fail or return later.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it for offline screens, queued edits, background synchronisation, local storage, reconnect handling, and tests involving lost or unreliable networks.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/makifbaysal/tasktrooper/offline-sync
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 makifbaysal/tasktrooper --skill offline-sync
Clone the repo
git clone --depth 1 https://github.com/makifbaysal/tasktrooper

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.

agentmods badge for offline-sync

README.md
[![agentmods](https://agentmods.dev/badge/skills/makifbaysal/tasktrooper/offline-sync/github.svg)](https://agentmods.dev/skills/makifbaysal/tasktrooper/offline-sync)
Your own site
<a href="https://agentmods.dev/skills/makifbaysal/tasktrooper/offline-sync"><img src="https://agentmods.dev/badge/skills/makifbaysal/tasktrooper/offline-sync/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 offline-sync

Your own site · 80×15
<a href="https://agentmods.dev/skills/makifbaysal/tasktrooper/offline-sync"><img src="https://agentmods.dev/badge/skills/makifbaysal/tasktrooper/offline-sync.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 745 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 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00050 $0.00745
Opus 5.5 $0.00020 $0.00298
Sonnet 5.5 $0.00010 $0.00149
Haiku 4.5 $0.00005 $0.00075

Measured 8d ago against content hash 08cf7683aacb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

offline-sync 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 8d 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.

catalog/agents/mobile-developer/skills/offline-sync/SKILL.md · 57 lines

How it starts

The opening of the file, as written. The whole thing — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Offline and Sync

Overview

Treat "offline" as a normal state, not an error condition: a screen that only works with a live connection is a defect on mobile. The hard part isn't detecting offline — it's making a queued mutation replay exactly once and keeping the UI honest about what's actually saved.

Local store

Follow the repo's existing choice (drift/sqflite for Flutter, Room for Android, SwiftData/Core Data for iOS) — don't introduce a second local-storage mechanism alongside one that's already there.

Outbox pattern

  • Queue mutations in a local outbox table when offline; replay on reconnect.
  • Every queued mutation carries a client-generated idempotency key, sent with the eventual request, so a retried replay (after a crash mid-sync, or a flaky connection that "succeeded" without the ack arriving) is deduplicated server-side instead of double-applied.
  • Connectivity plugins (connectivity_plus and equivalents) report the state of the network interface, not whether the server is actually reachable — treat the server's response as the source of truth for whether a request succeeded, not the interface state alone.

Background replay

  • Android: WorkManager (native) or the workmanager plugin (Flutter) for replay that must survive the app being backgrounded or killed.
  • iOS: BGTaskScheduler for background replay — register and schedule it, and test on-device since the simulator's background scheduling is unreliable.

UI honesty

Show sync status explicitly per item — pending / syncing / failed — never render an unsynced change as if it were already saved. A spinner that never resolves is worse than an honest "failed, tap to retry."

Conflicts

Pick one conflict rule per data type (last-write-wins, or an explicit user choice when both sides changed) and write it down in the task — don't leave it implicit in the code for the next person to infer.

Reads degrade gracefully

Cached data with a staleness indicator beats a spinner that never resolves — show what you have, mark it as possibly stale, and update when the network returns.

Read the full file on GitHub · 57 lines

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. 8d ago First seen · 57 lines · 50 tokens per session scan A 08cf7683aacb

Subscribe to this mod's changes

offline-sync is a skill published in the GitHub repository makifbaysal/tasktrooper (113 stars, last pushed yesterday), licensed Apache-2.0. It adds 50 tokens to every session and 745 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 2026-10-05.

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