Agent skill

Better Auth

Better Auth in TypeScript — setting up the auth instance, picking adapters, wiring framework route handlers, configuring sessions and cookies, adding plugins (2FA, organization, admin, magicLink…

MITAuto-check passedBackend & APIs

Install Better Auth

skills CLI

$ npx skills add pproenca/dot-skills --skill better-auth -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install pproenca/dot-skills better-auth --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/pproenca/dot-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.experimental/better-auth .claude/skills/better-auth && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "better-auth" agent skill from https://github.com/pproenca/dot-skills/tree/master/skills/.experimental/better-auth into .claude/skills/better-auth/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "better-auth", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/pproenca/dot-skills/tree/master/skills/.experimental/better-auth

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add pproenca/dot-skills --skill better-auth -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install pproenca/dot-skills better-auth --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/pproenca/dot-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/.experimental/better-auth .agents/skills/better-auth && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "better-auth" agent skill from https://github.com/pproenca/dot-skills/tree/master/skills/.experimental/better-auth into .agents/skills/better-auth/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "better-auth", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add pproenca/dot-skills --skill better-auth -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install pproenca/dot-skills better-auth --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/pproenca/dot-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/.experimental/better-auth .cursor/skills/better-auth && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "better-auth" agent skill from https://github.com/pproenca/dot-skills/tree/master/skills/.experimental/better-auth into .cursor/skills/better-auth/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "better-auth", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/pproenca/dot-skills.git --path skills/.experimental/better-auth

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add pproenca/dot-skills --skill better-auth -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install pproenca/dot-skills better-auth --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/pproenca/dot-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/.experimental/better-auth .gemini/skills/better-auth && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "better-auth" agent skill from https://github.com/pproenca/dot-skills/tree/master/skills/.experimental/better-auth into .gemini/skills/better-auth/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "better-auth", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install pproenca/dot-skills better-auth

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add pproenca/dot-skills --skill better-auth -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/pproenca/dot-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/.experimental/better-auth .github/skills/better-auth && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "better-auth" agent skill from https://github.com/pproenca/dot-skills/tree/master/skills/.experimental/better-auth into .github/skills/better-auth/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "better-auth", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add pproenca/dot-skills --skill better-auth -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install pproenca/dot-skills better-auth --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/pproenca/dot-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/.experimental/better-auth .opencode/skills/better-auth && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "better-auth" agent skill from https://github.com/pproenca/dot-skills/tree/master/skills/.experimental/better-auth into .opencode/skills/better-auth/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "better-auth", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: better-auth
GitHub stars: 214
Token cost: ~2.2k tokens
SKILL.md length: 642 words
Files: 47 (incl. references, assets)
Skills in repo: 182
Repo updated: Aug 15, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Better Auth in TypeScript — setting up the auth instance, picking adapters, wiring framework route handlers, configuring sessions and cookies, adding plugins (2FA, organization, admin, magicLink…

Works in 8 steps: Setup & Configuration (CRITICAL) → Database Adapters & Schema (CRITICAL) → API Route Handlers (CRITICAL) → …
Migrating Better Auth code — and even when the user doesnt explicitly mention Better Auth but is working on TypeScript authentication
SKILL.md covers When to Apply, Rule Categories by Priority, Quick Reference and How to Use, plus 1 more section
Needs BETTER_AUTH_SECRET

What it does

Better Auth is an agent skill from pproenca/dot-skills. Better Auth in TypeScript — setting up the auth instance, picking adapters, wiring framework route handlers, configuring sessions and cookies, adding plugins (2FA, organization, admin, magicLink, JWT), or porting from NextAuth/Auth.js, Clerk, Auth0, or Supabase Auth. Covers Next.js, SvelteKit, Hono, Express, Nuxt, Astro, and React/Vue/Svelte clients. Trigger when writing, reviewing, or migrating Better Auth code — and even when the user doesn't explicitly mention Better Auth but is working on TypeScript…

Its SKILL.md is about 2.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 49 other files, including reference files and assets (for example `AGENTS.md`, `assets/templates/_template.md` and `metadata.json`).

It sits in Backend & APIs, covering Authentication, Static sites and blogs and OAuth and OpenID Connect. It works with Better Auth, TypeScript, Supabase and Astro. The repository describes itself as: A collection of AI agent skills following the Agent Skills open format. The licence is MIT.

When your agent uses it

Migrating Better Auth code — and even when the user doesnt explicitly mention Better Auth but is working on TypeScript authentication
Session cookies
OAuth providers
Auth-library migration

Example prompts

“/better-auth”

Requirements

Node.js
A credential in BETTER_AUTH_SECRET

Workflow steps

8 steps, taken from the step headings in SKILL.md.

Setup & Configuration (CRITICAL)
Database Adapters & Schema (CRITICAL)
API Route Handlers (CRITICAL)
Session & Cookies (HIGH)
Auth Methods & Providers (HIGH)
Security & Hardening (HIGH)
Plugins & Extensions (MEDIUM)
Migration from Other Auth (MEDIUM)

What it can do on your machine

Read from SKILL.md and the folder at commit cf93c57. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
- better-auth.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
- BETTER_AUTH_SECRET
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Better Auth loads about 2.2k tokens when it runs, and up to ~30k if it reads all its reference files. Until then it costs about 164 tokens; SKILL.md has 642 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~164
When it runs · the whole SKILL.md, loaded when a task matches: ~2.2k
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~30k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from pproenca/dot-skills at commit cf93c57, republished under its MIT licence (© pproenca). 642 words, ~2,204 tokens.

Download SKILL.mdSave it as .claude/skills/better-auth/SKILL.md (or your agent's skills folder). This skill also uses 46 other files; get the full folder from GitHub.

name: better-auth
description: Better Auth in TypeScript — setting up the auth instance, picking adapters, wiring framework route handlers, configuring sessions and cookies, adding plugins (2FA, organization, admin, magicLink, JWT), or porting from NextAuth/Auth.js, Clerk, Auth0, or Supabase Auth. Covers Next.js, SvelteKit, Hono, Express, Nuxt, Astro, and React/Vue/Svelte clients. Trigger when writing, reviewing, or migrating Better Auth code — and even when the user doesn't explicitly mention Better Auth but is working on TypeScript authentication, session cookies, OAuth providers, or auth-library migration. Contains 42 rules organized by impact across 8 categories.

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 strong BETTER_AUTH_SECRET per environment
setup-base-url — Configure an explicit baseURL per environment
setup-client-base-url — Match the client baseURL to the server
setup-singleton — Export a single auth instance from a server-only module
setup-trusted-origins — Configure trustedOrigins for all non-baseURL callers

2. Database Adapters & Schema (CRITICAL)

db-adapter-selection — Pick the adapter that matches your ORM
db-schema-generate — Run auth generate then ORM migrate before every deploy
db-additional-fields — Extend the user schema via additionalFields
db-plugin-schema-customization — Rename plugin tables via the schema option
db-database-hooks — Use databaseHooks for cross-cutting logic
db-connection-pooling — Share one pooled DB client with the rest of your app

3. API Route Handlers (CRITICAL)

route-mount-catchall — Mount the catch-all handler at /api/auth/[...all]
route-runtime-selection — Use the Node.js runtime for middleware that calls auth.api
route-no-body-consumers — Mount auth before any body-parsing middleware

4. Session & Cookies (HIGH)

session-server-vs-client — Use auth.api.getSession on server, authClient.useSession on client
session-expiry-tuning — Configure expiresIn and updateAge together
session-cookie-cache — Enable cookieCache to cut session DB lookups
session-cookie-attributes — Set sameSite, secure, partitioned for cross-site flows
session-cross-subdomain — Enable crossSubDomainCookies for multi-subdomain apps
session-customsession-fields — Use customSession to add computed fields

5. Auth Methods & Providers (HIGH)

auth-require-email-verification — Enable requireEmailVerification with sendVerificationEmail
auth-oauth-redirect-uri — Match OAuth redirectURI exactly with the provider console
auth-oauth-env-vars — Load OAuth credentials from environment, never inline
auth-magic-link-setup — Implement sendMagicLink before enabling the magicLink plugin
auth-client-sign-in-helpers — Use authClient.signIn.social with callbackURL
auth-infer-additional-fields — Add inferAdditionalFields to the client for type sync

Show full SKILL.md (248 more words)Show less

6. Security & Hardening (HIGH)

security-rate-limit — Enable rateLimit with persistent storage in production
security-password-hash-interop — Override hash function when migrating from bcrypt/argon2
security-revoke-on-password-reset — Enable revokeSessionsOnPasswordReset
security-min-password-length — Set minPasswordLength to at least 10
security-trusted-origins-strict — Never wildcard trustedOrigins

7. Plugins & Extensions (MEDIUM)

plugins-next-cookies-last — Place nextCookies() as the LAST plugin in Next.js
plugins-two-factor-issuer — Set appName as the 2FA issuer
plugins-shared-access-control — Define ac + roles once, share server/client
plugins-pair-client-server — Pair every server plugin with its client counterpart
plugins-organization-active-context — Set active organization on session
plugins-jwt-when-to-use — Use the jwt plugin only for external service consumers
plugins-admin-impersonation — Use admin plugin's impersonate method for support access

8. Migration from Other Auth (MEDIUM)

migrate-parallel-cutover — Run Better Auth alongside legacy auth during cutover
migrate-oauth-account-mapping — Map legacy OAuth identities to account rows
migrate-force-allow-id — Use forceAllowId to preserve existing user IDs
migrate-nextauth-schema-mapping — Map NextAuth v5 columns field-by-field

How to Use

For a fresh implementation, read in priority order: start with all setup- rules, then db-, then route- — these CRITICAL categories must be correct or nothing else works. After the foundation, pick the rules that match your scope: session- for cookie/expiry tuning, auth- for provider configuration, security- for production hardening.

For a migration from another auth library, read migrate-parallel-cutover first (strategy), then security-password-hash-interop (preserve user passwords), then migrate-oauth-account-mapping and migrate-nextauth-schema-mapping (data layout).

Read individual reference files for detailed explanations, incorrect vs. correct code examples, and links to the canonical Better Auth documentation.

Reference Files

File	Description
references/_sections.md	Category definitions ordered by impact
assets/templates/_template.md	Template for adding new rules
metadata.json	Version, references, and discipline metadata

Files

SKILL.md and 46 other files (references, assets) in skills/.experimental/better-auth of pproenca/dot-skills.

SKILL.md
AGENTS.md
assets/templates/_template.md
metadata.json
references/_sections.md
references/auth-client-sign-in-helpers.md
references/auth-infer-additional-fields.md
references/auth-magic-link-setup.md
references/auth-oauth-env-vars.md
references/auth-oauth-redirect-uri.md
references/auth-require-email-verification.md
references/db-adapter-selection.md
references/db-additional-fields.md
references/db-connection-pooling.md
references/db-database-hooks.md
references/db-plugin-schema-customization.md
references/db-schema-generate.md
references/migrate-force-allow-id.md
… and 29 more

Open the folder on GitHubat commit cf93c57

Compare with similar skills

Better Auth next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Better Auth compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Better Auth this skillpproenca/dot-skills	214	—	~2.2k	Automated safety check: Pass	MIT	1 mo ago
Better Autheinverne/dotfiles	121	—	~4k	Automated safety check: Notes	MIT	28 days ago
Supabasecurvenote/curvenote	169	5 repos	~2.2k	Automated safety check: Pass	Custom licence	9 days ago
Supabase Development and Debuggingsupabase/agent-skills	2.7k	3 repos	~3.6k	Automated safety check: Pass	MIT	5 days ago
Better Auth Best Practiceslatitude-dev/latitude-llm	4.7k	7 repos	~1.6k	Automated safety check: Pass	MIT	yesterday
Clerkgeekskai/blog	103	3 repos	~1.5k	Automated safety check: Pass	MIT	yesterday

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Questions about Better Auth

What does Better Auth do?

Better Auth in TypeScript — setting up the auth instance, picking adapters, wiring framework route handlers, configuring sessions and cookies, adding plugins (2FA, organization, admin, magicLink…. Better Auth is an agent skill from pproenca/dot-skills.js, Clerk, Auth0, or Supabase Auth.

When should I use Better Auth?

Better Auth fits situations like: migrating Better Auth code — and even when the user doesnt explicitly mention Better Auth but is working on TypeScript authentication; session cookies; OAuth providers; auth-library migration.

How do I install Better Auth in Claude Code?

Run `npx skills add pproenca/dot-skills --skill better-auth -a claude-code`. Or copy the skill folder (skills/.experimental/better-auth in pproenca/dot-skills) into .claude/skills/better-auth in your project. Claude Code loads it when a task matches its description.

How do I install Better Auth in Codex?

Run `npx skills add pproenca/dot-skills --skill better-auth -a codex`. Or copy the skill folder (skills/.experimental/better-auth in pproenca/dot-skills) into .agents/skills/better-auth in your project. Codex loads it when a task matches its description.

Can I use Better Auth in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add pproenca/dot-skills --skill better-auth -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/better-auth, .gemini/skills/better-auth, .github/skills/better-auth and .opencode/skills/better-auth in your project.

What does Better Auth need to run?

Going by SKILL.md and its folder, Better Auth needs credentials named BETTER_AUTH_SECRET. Our summary lists: Node.js; A credential in BETTER_AUTH_SECRET.

Does Better Auth access the network?

SKILL.md names 1 domain. As links in the text: better-auth.com. This is read from the text; nothing was executed.

Is Better Auth safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Better Auth use?

Better Auth is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Better Auth use?

About 2.2k tokens (SKILL.md is roughly 8.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 28k tokens, read only when the agent opens those files.

What are the alternatives to Better Auth?

Skills that share tags, products or a category with Better Auth: Better Auth (einverne/dotfiles, 121 stars), Supabase (curvenote/curvenote, 169 stars), Supabase Development and Debugging (supabase/agent-skills, 2.7k stars) and Better Auth Best Practices (latitude-dev/latitude-llm, 4.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Better Auth?

pproenca (a GitHub user) maintains it in pproenca/dot-skills, which has 214 GitHub stars. The repository holds 182 skills in this directory. The repository was last updated on August 15, 2026.

Source: pproenca/dot-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Better Auth

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Better Auth Best Practices

When to Apply

Rule Categories by Priority

Quick Reference

1. Setup & Configuration (CRITICAL)

2. Database Adapters & Schema (CRITICAL)

3. API Route Handlers (CRITICAL)

4. Session & Cookies (HIGH)

5. Auth Methods & Providers (HIGH)

6. Security & Hardening (HIGH)

7. Plugins & Extensions (MEDIUM)

8. Migration from Other Auth (MEDIUM)

How to Use

Reference Files

Files

Compare with similar skills

Similar skills

More from pproenca/dot-skills

Related

Questions about Better Auth