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 ashish7802/awesome-api-skills --skill better-authgit clone --depth 1 https://github.com/ashish7802/awesome-api-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/ashish7802/awesome-api-skills/better-auth)<a href="https://agentmods.dev/skills/ashish7802/awesome-api-skills/better-auth"><img src="https://agentmods.dev/badge/skills/ashish7802/awesome-api-skills/better-auth/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/ashish7802/awesome-api-skills/better-auth"><img src="https://agentmods.dev/badge/skills/ashish7802/awesome-api-skills/better-auth.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00000 | $0.00510 |
| Opus 5 | $0.00000 | $0.00255 |
| Sonnet 5 | $0.00000 | $0.00102 |
| Haiku 4.5 | $0.00000 | $0.00051 |
Grade A, and why
better-auth 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 9d 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 — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Better Auth API Skill
Quick Start
Better Auth provides framework-agnostic auth (Next.js, Express, SvelteKit) deeply integrated with modern ORMs like Drizzle and Prisma.
npm install better-auth
Common Workflows
OAuth and Magic Links
Configure plugins to enable OAuth (GitHub, Google) or Magic Links. Better Auth natively handles session creation and saves profiles to your database using the provided database adapter.
Production Patterns
Two-Factor Authentication
Utilize the twoFactor plugin to require TOTP before issuing a valid session cookie. Ensure you construct your UI to gracefully handle the requires_two_factor response state.
Error Recovery
Handle BetterAuthError. When creating users, handle conflicts gracefully (e.g., Email already exists) and prompt the user to log in instead.
Security Notes
Better Auth handles CSRF and secure cookies out of the box. Ensure your trustedOrigins configuration accurately reflects your production domains to prevent session hijacking.
Performance Considerations
Session validation happens on the Edge or Server. Optimize your database queries (e.g., adding indexes to the session_token column) to ensure ultra-fast session lookups on every request.
Testing Guidance
Better Auth can be mocked easily by overriding the getSession function in your unit tests, or by provisioning a test database specifically for your test runner.
Troubleshooting
If sessions randomly invalidate, ensure you are not clearing cookies improperly across subdomains and that the secret configuration variable remains static across deployments.
References
Related Skills
Why use this skill
Use this when your agent works with better-auth — structured patterns beat pasted docs and prevent common hallucinations.
AI pitfalls
- Using outdated SDK or API versions from training data
- Inventing environment variable names
- Omitting error handling and retry logic
What ships with it
7 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.
- 9d ago First seen · 59 lines · 0 tokens per session scan A 7e72becb3fbd
better-auth is a skill published in the GitHub repository ashish7802/awesome-api-skills (13 stars, last pushed 9d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 510 tokens. 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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