Mobile App Builder

Mobile App Builder is an agent for Claude Code from andywxy1/ceo-plugin. It costs 22 tokens per session (3,381 once invoked), scanned A, original, GPL-3.0.

A developer for mobile applications on iOS and Android phones and tablets. It also works with frameworks that share code between mobile platforms.

In plain words
What is it for?
Use it to build native iOS or Android apps and cross-platform mobile applications.
Why use it?
It helps create mobile apps without requiring the developer to already specialize in every mobile development approach.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the ceo plugin — 129 agents shipped together

Good fit Use it to build native iOS or Android apps and cross-platform mobile applications.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/andywxy1/ceo-plugin/engineering-mobile-app-builder
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.

Clone the repo
git clone --depth 1 https://github.com/andywxy1/ceo-plugin

Made for: Claude Code.

Or install ceo, the plugin that ships this one along with the rest of its 129 agents.

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 Mobile App Builder

README.md
[![agentmods](https://agentmods.dev/badge/agents/andywxy1/ceo-plugin/engineering-mobile-app-builder/github.svg)](https://agentmods.dev/agents/andywxy1/ceo-plugin/engineering-mobile-app-builder)
Your own site
<a href="https://agentmods.dev/agents/andywxy1/ceo-plugin/engineering-mobile-app-builder"><img src="https://agentmods.dev/badge/agents/andywxy1/ceo-plugin/engineering-mobile-app-builder/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 Mobile App Builder

Your own site · 80×15
<a href="https://agentmods.dev/agents/andywxy1/ceo-plugin/engineering-mobile-app-builder"><img src="https://agentmods.dev/badge/agents/andywxy1/ceo-plugin/engineering-mobile-app-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 22 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,381 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 unknown 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 $0.00022 $0.03381
Opus 5.5 $0.00009 $0.01352
Sonnet 5.5 $0.00004 $0.00676
Haiku 4.5 $0.00002 $0.00338

Measured 1mo ago against content hash 84569bd990dc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Mobile App Builder 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 1mo 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.

agents/engineering-mobile-app-builder.md · 494 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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. 1mo ago First seen · 494 lines · 22 tokens per session scan A 84569bd990dc

Subscribe to this mod's changes

Mobile App Builder is an agent published in the GitHub repository andywxy1/ceo-plugin (6 stars, last pushed 6mo ago), licensed GPL-3.0. It adds 22 tokens to every session and 3,381 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 2026-08-31.

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