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 pproenca/dot-skills --skill better-authgit clone --depth 1 https://github.com/pproenca/dot-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/pproenca/dot-skills/better-auth)<a href="https://agentmods.dev/skills/pproenca/dot-skills/better-auth"><img src="https://agentmods.dev/badge/skills/pproenca/dot-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/pproenca/dot-skills/better-auth"><img src="https://agentmods.dev/badge/skills/pproenca/dot-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 | $0.00141 | $0.02058 |
| Opus 5 | $0.00071 | $0.01029 |
| Sonnet 5 | $0.00028 | $0.00412 |
| Haiku 4.5 | $0.00014 | $0.00206 |
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 5d 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 — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Better Auth Best Practices
Implementation and migration guide for Better Auth, the framework-agnostic TypeScript authentication and authorization library. This skill contains 42 rules organized by impact across 8 categories, derived from the official documentation and migration guides.
When to Apply
Reference these guidelines when:
- Setting up a fresh Better Auth instance (config, adapter, route handler, client)
- Wiring framework-specific integrations (Next.js App/Pages Router, SvelteKit, Hono, Express, Nuxt, Astro)
- Configuring sessions, cookies, and security (rate limit, trusted origins, password hashing)
- Adding plugins: 2FA, organization, admin, magicLink, JWT, passkey, multi-session
- Migrating from another auth library (NextAuth/Auth.js, Clerk, Auth0, Supabase Auth)
- Debugging "session is null" / "redirect_uri_mismatch" / 403 CSRF errors
- Reviewing PRs that touch
lib/auth.ts,auth-client.ts, or/api/auth/route handlers
Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Setup & Configuration | CRITICAL | setup- |
| 2 | Database Adapters & Schema | CRITICAL | db- |
| 3 | API Route Handlers | CRITICAL | route- |
| 4 | Session & Cookies | HIGH | session- |
| 5 | Auth Methods & Providers | HIGH | auth- |
| 6 | Security & Hardening | HIGH | security- |
| 7 | Plugins & Extensions | MEDIUM | plugins- |
| 8 | Migration from Other Auth | MEDIUM | migrate- |
Quick Reference
1. Setup & Configuration (CRITICAL)
setup-secret— Set a strongBETTER_AUTH_SECRETper environmentsetup-base-url— Configure an explicitbaseURLper environmentsetup-client-base-url— Match the clientbaseURLto the serversetup-singleton— Export a single auth instance from a server-only modulesetup-trusted-origins— ConfiguretrustedOriginsfor all non-baseURL callers
What ships with it
46 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.
- AGENTS.md 14 KB
- assets/templates/_template.md 2.5 KB
- metadata.json 2.5 KB
- references/_sections.md 3.0 KB
- references/auth-client-sign-in-helpers.md 2.5 KB
- references/auth-infer-additional-fields.md 2.6 KB
- references/auth-magic-link-setup.md 2.7 KB
- references/auth-oauth-env-vars.md 2.6 KB
- references/auth-oauth-redirect-uri.md 2.8 KB
- references/auth-require-email-verification.md 2.6 KB
- references/db-adapter-selection.md 2.3 KB
- references/db-additional-fields.md 2.6 KB
- references/db-connection-pooling.md 2.4 KB
- references/db-database-hooks.md 2.8 KB
- references/db-plugin-schema-customization.md 2.2 KB
- references/db-schema-generate.md 2.1 KB
- references/migrate-force-allow-id.md 2.7 KB
- references/migrate-nextauth-schema-mapping.md 3.4 KB
- references/migrate-oauth-account-mapping.md 3.3 KB
- references/migrate-parallel-cutover.md 2.9 KB
- references/plugins-admin-impersonation.md 2.5 KB
- references/plugins-jwt-when-to-use.md 3.0 KB
- references/plugins-next-cookies-last.md 2.2 KB
- references/plugins-organization-active-context.md 2.7 KB
- references/plugins-pair-client-server.md 2.9 KB
- references/plugins-shared-access-control.md 3.1 KB
- references/plugins-two-factor-issuer.md 2.2 KB
- references/route-mount-catchall.md 2.7 KB
- references/route-no-body-consumers.md 2.5 KB
- references/route-runtime-selection.md 3.1 KB
- references/security-min-password-length.md 2.3 KB
- references/security-password-hash-interop.md 2.8 KB
- references/security-rate-limit.md 2.6 KB
- references/security-revoke-on-password-reset.md 2.6 KB
- references/security-trusted-origins-strict.md 2.5 KB
- references/session-cookie-attributes.md 2.3 KB
- references/session-cookie-cache.md 2.1 KB
- references/session-cross-subdomain.md 2.3 KB
- references/session-customsession-fields.md 2.7 KB
- references/session-expiry-tuning.md 2.2 KB
- references/session-server-vs-client.md 2.6 KB
- references/setup-base-url.md 2.1 KB
- references/setup-client-base-url.md 1.9 KB
- references/setup-secret.md 1.5 KB
- references/setup-singleton.md 2.2 KB
- references/setup-trusted-origins.md 2.2 KB
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.
- 5d ago First seen · 117 lines · 141 tokens per session scan A 4a86f93639ff
better-auth is a skill published in the GitHub repository pproenca/dot-skills (205 stars, last pushed 24d ago), licensed MIT. It adds 141 tokens to every session and 2,058 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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