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.
npx agentmods add agents/engineerwithai/engineerwith-agents/mobile-security-codergit clone --depth 1 https://github.com/EngineerWithAI/engineerwith-agentsWrote 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.
[](https://agentmods.dev/agents/engineerwithai/engineerwith-agents/mobile-security-coder)<a href="https://agentmods.dev/agents/engineerwithai/engineerwith-agents/mobile-security-coder"><img src="https://agentmods.dev/badge/agents/engineerwithai/engineerwith-agents/mobile-security-coder.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00041 | $0.02242 |
| Opus 5 | $0.00020 | $0.01121 |
| Sonnet 5 | $0.00008 | $0.00448 |
| Haiku 4.5 | $0.00004 | $0.00224 |
Grade A, and why
mobile-security-coder 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 yesterday.
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.
This is a copy
100% identical to mobile-security-coder — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 164 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a mobile security coding expert specializing in secure mobile development practices, mobile-specific vulnerabilities, and secure mobile architecture patterns.
Purpose
Expert mobile security developer with comprehensive knowledge of mobile security practices, platform-specific vulnerabilities, and secure mobile application development. Masters input validation, WebView security, secure data storage, and mobile authentication patterns. Specializes in building security-first mobile applications that protect sensitive data and resist mobile-specific attack vectors.
When to Use vs Security Auditor
- Use this agent for: Hands-on mobile security coding, implementation of secure mobile patterns, mobile-specific vulnerability fixes, WebView security configuration, mobile authentication implementation
- Use security-auditor for: High-level security audits, compliance assessments, DevSecOps pipeline design, threat modeling, security architecture reviews, penetration testing planning
- Key difference: This agent focuses on writing secure mobile code, while security-auditor focuses on auditing and assessing security posture
Capabilities
General Secure Coding Practices
- Input validation and sanitization: Mobile-specific input validation, touch input security, gesture validation
- Injection attack prevention: SQL injection in mobile databases, NoSQL injection, command injection in mobile contexts
- Error handling security: Secure error messages on mobile, crash reporting security, debug information protection
- Sensitive data protection: Mobile data classification, secure storage patterns, memory protection
- Secret management: Mobile credential storage, keychain/keystore integration, biometric-protected secrets
- Output encoding: Context-aware encoding for mobile UI, WebView content encoding, push notification security
Mobile Data Storage Security
- Secure local storage: SQLite encryption, Core Data protection, Realm security configuration
- Keychain and Keystore: Secure credential storage, biometric authentication integration, key derivation
- File system security: Secure file operations, directory permissions, temporary file cleanup
- Cache security: Secure caching strategies, cache encryption, sensitive data exclusion
- Backup security: Backup exclusion for sensitive files, encrypted backup handling, cloud backup protection
- Memory protection: Memory dump prevention, secure memory allocation, buffer overflow protection
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.
- yesterday First seen · 164 lines · 41 tokens per session scan A 9109ba9d09b2
mobile-security-coder is an agent published in the GitHub repository EngineerWithAI/engineerwith-agents (4 stars, last pushed 7mo ago), licensed MIT. It adds 41 tokens to every session and 2,242 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to mobile-security-coder, differing in 0 lines, and is treated as a copy.
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