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 curiositech/some_claude_skills --skill modern-auth-2026git clone --depth 1 https://github.com/curiositech/some_claude_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/curiositech/some_claude_skills/modern-auth-2026)<a href="https://agentmods.dev/skills/curiositech/some_claude_skills/modern-auth-2026"><img src="https://agentmods.dev/badge/skills/curiositech/some_claude_skills/modern-auth-2026/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/curiositech/some_claude_skills/modern-auth-2026"><img src="https://agentmods.dev/badge/skills/curiositech/some_claude_skills/modern-auth-2026.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 5 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 739 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.
- high Privilege Escalation · line 750 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.
- high Privilege Escalation · line 889 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.
- high Privilege Escalation · line 882 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.
- high Privilege Escalation · line 884 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.
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 | $0.00134 | $0.06697 |
| Opus 5 | $0.00067 | $0.03349 |
| Sonnet 5 | $0.00027 | $0.01339 |
| Haiku 4.5 | $0.00013 | $0.00670 |
Grade A, and why
modern-auth-2026 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 7d 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 — 951 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Modern Authentication Expert (2026)
Master passwordless-first authentication with passkeys, OAuth, magic links, and cross-device sync for modern web and mobile applications.
When to Use
✅ USE this skill for:
- Implementing passkeys/WebAuthn authentication
- Google and Apple OAuth social login
- Supabase Auth configuration and troubleshooting
- Magic link/OTP passwordless flows
- Cross-device authentication sync
- MFA implementation (TOTP, passkeys as 2FA)
- Email/SMS recovery flows
- App Store compliance for social login
❌ DO NOT use for:
- Session management without auth context → use standard JWT patterns
- Authorization/RBAC policies → use
security-auditorskill - API key management → use
api-architectskill - Supabase RLS policies → use
supabase-adminskill
2026 Authentication Landscape
Industry Adoption Stats
- Passkeys: 87% of US/UK companies now use passkeys (FIDO Alliance)
- Google: 800+ million accounts use passkeys
- Amazon: 175 million users created passkeys in first year
- Trend: Passwordless is the security baseline, not a luxury
Key Standards
| Standard | Purpose | Status |
|---|---|---|
| WebAuthn L2 | Browser passkey API | Fully supported |
| FIDO2/CTAP2 | Cross-platform passkeys | Mature |
| OAuth 2.1 | Simplified OAuth | Replacing 2.0 |
| OAuth3 | Short-lived tokens | Emerging |
| Passkey Sync | iCloud/Google sync | Production |
Architecture: Passwordless-First Design
Recommended Auth Hierarchy (2026)
Primary Methods (Phishing-Resistant):
├── 1. Passkeys (WebAuthn) ← PREFERRED
│ ├── Platform authenticators (Face ID, Touch ID, Windows Hello)
│ └── Roaming authenticators (YubiKey, security keys)
├── 2. Social OAuth
│ ├── Google Sign-In (synced passkeys)
│ └── Apple Sign-In (privacy-focused)
│
Fallback Methods (Lower Security):
├── 3. Magic Links (email-based)
├── 4. Email OTP (time-limited codes)
└── 5. SMS OTP (deprecated - SIM swap risk)
⚠️ SMS should be last resort only
Legacy (Avoid):
└── 6. Password + Email ← DISCOURAGE
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.
- 7d ago First seen · 951 lines · 134 tokens per session scan A eab615ec8ba6
modern-auth-2026 is a skill published in the GitHub repository curiositech/some_claude_skills (219 stars, last pushed 5d ago), licensed MIT. It adds 134 tokens to every session and 6,697 once invoked, about $0.0007 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 2026-09-03.
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