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 authenticationgit 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/authentication)<a href="https://agentmods.dev/skills/talissonvitorino/kmp-ios-skills/authentication"><img src="https://agentmods.dev/badge/skills/talissonvitorino/kmp-ios-skills/authentication/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/authentication"><img src="https://agentmods.dev/badge/skills/talissonvitorino/kmp-ios-skills/authentication.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to high
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 →
- high Privilege Escalation · line 249 Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
- medium Rogue Agent · line 284 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 | $0.00178 | $0.04250 |
| Opus 5 | $0.00089 | $0.02125 |
| Sonnet 5 | $0.00036 | $0.00850 |
| Haiku 4.5 | $0.00018 | $0.00425 |
Grade A, and why
authentication 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 — 302 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Authentication (iOS)
User-facing sign-in for a fintech iOS app, built on Apple's AuthenticationServices
(ASAuthorization*, ASWebAuthenticationSession) and LocalAuthentication (LAContext).
Targets the iOS 26 era. This skill covers how the user proves identity; storing the
resulting tokens/keys is a separate concern.
- Token & key storage / crypto / biometric-gated Keychain items:
swift-security(Keychain, CryptoKit, Secure Enclave). Never keep tokens inUserDefaults. - Device legitimacy / anti-fraud (App Attest, DeviceCheck):
device-integrity— pairs with these flows to bind an account to a real device. - Apple Pay / Wallet passes:
passkit. KMP boundary (expose acommonMainAuthServiceinterface, bind aniosMainactual):expect-actual.
Contents
- Choosing a method
- Sign in with Apple
- Passkeys / WebAuthn
- Password AutoFill
- ASWebAuthenticationSession (hosted OAuth/OIDC)
- Identity-token / server validation
- Biometric re-auth for sensitive actions
- Correctness checklist
- Depth:
references/passkeys.md,references/siwa-server-validation.md
Choosing a method
| Need | Use |
|---|---|
| First-party account, minimal friction, Apple-gated | Sign in with Apple |
| Passwordless, phishing-resistant, cross-device | Passkeys (platform) |
| Hardware 2FA / regulated step-up | Security-key passkeys |
| Third-party IdP (Auth0/Okta/Google) via web | ASWebAuthenticationSession + PKCE |
| Migrate existing username/password users | Password AutoFill |
| Re-confirm the same logged-in user before a payment | LAContext (see swift-security) |
- Prefer passkeys for new passwordless accounts and Sign in with Apple where an Apple-native identity fits. Both are phishing-resistant; passwords are not.
- All
ASAuthorization*requests run through oneASAuthorizationController— you can offer Sign in with Apple and passkeys from a single controller and let the user pick.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 302 lines · 178 tokens per session scan A 7d110c457b1b
authentication is a skill published in the GitHub repository TalissonVitorino/kmp-ios-skills (12 stars, last pushed 15d ago), licensed MIT. It adds 178 tokens to every session and 4,250 once invoked, about $0.0009 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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