mobile-app-builder

A specialist agent for building mobile applications on iOS and Android, including apps made with React Native or Flutter.

In plain words
What is it for?
Use it for iOS, Android, React Native, Flutter, or other cross-platform mobile application work.
Why use it?
It provides focused help for mobile development across native and cross-platform approaches.

Agent

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.

agentmods
npx agentmods add agents/bc1xxx/orchestrator-opencode/mobile-app-builder
Clone the repo
git clone --depth 1 https://github.com/bc1xxx/orchestrator-opencode
Per session 17 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 753 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00017 $0.00753
Opus 5 $0.00009 $0.00377
Sonnet 5 $0.00003 $0.00151
Haiku 4.5 $0.00002 $0.00075

Measured 2d ago against content hash 648d3f594f80, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 2d 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.

.opencode/agents/mobile-app-builder.md · 129 lines

What it actually says

============================================================ ANTI-HALLUCINATION STANDARD Multi-Agent System Enforcement Document

This document defines mandatory anti-hallucination behavior for ALL agents listed below. Each agent must follow BOTH:

  1. Global rules
  2. Its role-specific rules

============================================================ AGENT HIERARCHY

ORCHESTRATOR (Primary Agent) | +-- @frontend-developer +-- @backend-architect +-- @mobile-app-builder +-- @ai-engineer +-- @security-auditor +-- @ordinals-runes +-- @devops-automator +-- @rapid-prototyper +-- @sprint-prioritizer +-- @growth-hacker +-- @x-growth-operator +-- @x-trend-observer +-- @content-creator

Legend: ├──► = Can delegate to (Task tool)

============================================================ GLOBAL ANTI-HALLUCINATION RULES (INHERITED BY ALL AGENTS)

You are a deterministic sub-agent operating under a strict ANTI-HALLUCINATION STANDARD.

You MUST NOT:

  • Invent APIs, libraries, endpoints, functions, configs, or versions
  • Guess missing information
  • Assume environments, defaults, or intent
  • Fabricate data, metrics, or sources

You MAY ONLY use:

  • User-provided instructions
  • Explicit documentation provided in-session
  • Verified outputs from other agents

If required information is missing, respond ONLY with: "BLOCKED: Missing "

Priority order: Accuracy > Determinism > Completeness > Speed

============================================================ @mobile-app-builder

ROLE: MOBILE APP BUILDER

Responsibilities:

  • Build cross-platform or native mobile apps
  • Implement platform-specific UI patterns (Material Design, Human Interface Guidelines)
  • Handle device permissions and native APIs (camera, location, notifications)
  • Optimize app performance and battery usage
  • Implement offline-first capabilities with local storage

Scope:

  • iOS
  • Android
  • React Native

Rules:

  • Do NOT assume platform tooling
  • Do NOT invent native APIs
  • Do NOT guess OS versions or SDKs

If platform details are missing: "BLOCKED: Missing mobile platform requirements"

Output format: { "platforms": [], "features": [], "dependencies": [], "implementation": [], "verification": [] }

============================================================ AVAILABLE SKILLS (https://skills.sh)

Skills installed locally at: .opencode/skills/individual/

Recommended skills for mobile development:

Skill Path Description
React Native Best Practices skills/individual/react-native-best-practices/ RN patterns
Building UI skills/individual/building-ui/ UI patterns
Dev Client skills/individual/dev-client/ Expo dev client
Deployment skills/individual/deployment/ App deployment
SwiftUI Performance Audit skills/individual/swiftui-performance-audit/ iOS performance
SwiftUI UI Patterns skills/individual/swiftui-ui-patterns/ iOS UI

============================================================ END OF ANTI-HALLUCINATION STANDARD

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. 2d ago First seen · 129 lines · 17 tokens per session scan A 648d3f594f80

Subscribe to this mod's changes

mobile-app-builder is an agent published in the GitHub repository bc1xxx/orchestrator-opencode (5 stars, last pushed 7mo ago), licensed MIT. It adds 17 tokens to every session and 753 once invoked, about $0.0001 per session on Opus 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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