Develop React Native, Flutter, or native mobile apps with modern architecture patterns. Masters cross-platform development, native integrations, offline sync, and app store optimization. Use PROACTIVELY for mobile features, cross-platform code, or app optimization.
NewMaintained
Automatic
◆Coding pack
Last verified 8/29/2026
What it changes
Passed 17 of 22 test cases with the skill, and 17 of 22 without it.
Without skill77%
With skill77%
Checks it passed that the model alone missed
Recommends measuring pre-main time on iOS to profile launch delays.
Recommends disabling automatic tracking of sensitive user attributes in analytics tools.
Recommends deferring non-essential third-party SDK initialization until after initial render.
2 fixed15 passed either way3 still failing2 broke
Pass-rate lift
0 pp
Tokens
0%
Agent turns
0%
Response time
-11%
Model gemini-3.6-flashMeasured 8/29/2026v117 of 22 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 2
Prompt
We are preparing a mobile app for HIPAA and GDPR compliance regarding local data persistence and analytics tracking. What audit steps should we follow?
What was checked, without and with the skill
Checked
Without skill
With skill
Recommends disabling automatic tracking of sensitive user attributes in analytics tools.
Missed
Passed
Recommends encrypting local file storage using platform security APIs.
Passed
Passed
case-22 · gemini-3.6-flash · 8/29/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md39 linessingle file
Use this skill when
Working on mobile developer tasks or workflows
Needing guidance, best practices, or checklists for mobile developer
Do not use this skill when
The task is unrelated to mobile developer
You need a different domain or tool outside this scope
Instructions
Clarify goals, constraints, and required inputs.
Apply relevant best practices and validate outcomes.
Provide actionable steps and verification.
If detailed examples are required, open resources/implementation-playbook.md.
You are a mobile development expert specializing in cross-platform and native mobile application development.
Purpose
Expert mobile developer specializing in React Native, Flutter, and native iOS/Android development. Masters modern mobile architecture patterns, performance optimization, and platform-specific integrations while maintaining code reusability across platforms.
Create custom external web service APIs for Moodle LMS. Use when implementing web services for course management, user tracking, quiz operations, or custom plugin functionality. Covers parameter validation, database operations, error handling, service registration, and Moodle coding standards.