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 skills add TalissonVitorino/kmp-ios-skills --skill mobile-session-securitygit clone --depth 1 https://github.com/TalissonVitorino/kmp-ios-skillsWrote 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/skills/talissonvitorino/kmp-ios-skills/mobile-session-security)<a href="https://agentmods.dev/skills/talissonvitorino/kmp-ios-skills/mobile-session-security"><img src="https://agentmods.dev/badge/skills/talissonvitorino/kmp-ios-skills/mobile-session-security/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.
<a href="https://agentmods.dev/skills/talissonvitorino/kmp-ios-skills/mobile-session-security"><img src="https://agentmods.dev/badge/skills/talissonvitorino/kmp-ios-skills/mobile-session-security.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Rogue Agent · line 273 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 5.1 | $0.00209 | $0.04469 |
| Opus 5 | $0.00105 | $0.02235 |
| Sonnet 5 | $0.00042 | $0.00894 |
| Haiku 4.5 | $0.00021 | $0.00447 |
Grade A, and why
mobile-session-security 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 382 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mobile Session Security (KMP + iOS / Android)
Session-layer hardening for a fintech app: lock the session after inactivity or on background, force biometric/passcode re-auth to resume, and keep sensitive UI (balances, PANs, tokens) out of app-switcher snapshots and screen recordings. Grounded in AndroidX Lifecycle/BiometricPrompt, WindowManager, UIKit, and LocalAuthentication.
- Secret storage / biometric-gated keys (iOS):
swift-security(Keychain,LAContext, Secure Enclave). - Secret storage (Android/KMP):
mobile-security(Keystore,setUserAuthenticationRequired). - Login / passkeys / OAuth:
authentication. This skill covers re-auth of an existing session, not first sign-in. - Scene/process lifecycle plumbing:
app-lifecycle. KMP boundary shape:expect-actual.
Contents
- Threat model / fintech framing
- Shared KMP SessionLockController
- Inactivity auto-lock
- Re-lock on background / foreground
- Biometric / passcode re-auth
- Screen-capture / snapshot protection
- Correctness checklist
Threat model / fintech framing
- Idle device left unlocked → someone else sees balances or moves money. Mitigation: inactivity auto-lock with re-auth.
- App-switcher snapshot → the OS caches a screenshot of the last frame for the multitasking UI; a balance/PAN leaks there. Mitigation: hide sensitive UI on resign-active (iOS) /
FLAG_SECURE(Android). - Screen recording / mirroring / AirPlay → exfiltrates whatever is on screen. Mitigation:
FLAG_SECURE(Android, hard block) /UIScreen.isCaptureddetect-and-hide (iOS, best-effort). - Compliance: idle re-auth and snapshot masking are expectations under PCI-DSS-adjacent mobile guidance and OWASP MASVS-STORAGE-2 (no sensitive data in backups/screenshots) and MASVS-AUTH. Treat them as required controls, not nice-to-haves.
- Honest limits: the lock is a UX/defense-in-depth control, not a substitute for keeping secrets in the Keychain/Keystore (
swift-security/mobile-security). A jailbroken/rooted device can bypass any client-side lock — gate the secret material on biometrics, not just a boolean.
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.
- 10d ago First seen · 382 lines · 209 tokens per session scan A a7fad2dae462
mobile-session-security is a skill published in the GitHub repository TalissonVitorino/kmp-ios-skills (12 stars, last pushed 16d ago), licensed MIT. It adds 209 tokens to every session and 4,469 once invoked, about $0.0010 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 2026-08-30.
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