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better-auth-overview-and-setup

better-auth-overview-and-setup is a skill for Claude Code, Codex from andrewsrigom/agent-skills. It costs 52 tokens per session (805 once invoked), scanned A, original, MIT.

A setup guide for Better Auth, a library for adding user sign-in and account access to an application. It covers installing the library, configuring secrets and URLs, connecting its server handler, creating the client, and choosing sign-in methods or plugins.

In plain words
What is it for?
For adding Better Auth to an application, including email/password or social sign-in, server and browser setup, and plugin-aware configuration.
Why use it?
It gives a first-time setup path and helps decide whether later work belongs to sessions, OAuth, Next.js, or a plugin-specific guide.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 2repo 7mo ago A scan 52 tokens original MIT

Good fit For adding Better Auth to an application, including email/password or social sign-in, server and browser setup, and plugin-aware configuration.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/andrewsrigom/agent-skills/better-auth-overview-and-setup
View source ↗ andrewsrigom/agent-skills andrewsrigom.github.io
Install

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.

Any agent
npx skills add andrewsrigom/agent-skills --skill better-auth-overview-and-setup
Clone the repo
git clone --depth 1 https://github.com/andrewsrigom/agent-skills

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for better-auth-overview-and-setup

README.md
[![agentmods](https://agentmods.dev/badge/skills/andrewsrigom/agent-skills/better-auth-overview-and-setup/github.svg)](https://agentmods.dev/skills/andrewsrigom/agent-skills/better-auth-overview-and-setup)
Your own site
<a href="https://agentmods.dev/skills/andrewsrigom/agent-skills/better-auth-overview-and-setup"><img src="https://agentmods.dev/badge/skills/andrewsrigom/agent-skills/better-auth-overview-and-setup/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.

agentmods 80×15 button for better-auth-overview-and-setup

Your own site · 80×15
<a href="https://agentmods.dev/skills/andrewsrigom/agent-skills/better-auth-overview-and-setup"><img src="https://agentmods.dev/badge/skills/andrewsrigom/agent-skills/better-auth-overview-and-setup.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 805 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00052 $0.00805
Opus 5.5 $0.00021 $0.00322
Sonnet 5.5 $0.00010 $0.00161
Haiku 4.5 $0.00005 $0.00081

Measured 2mo ago against content hash e6e253d93086, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

better-auth-overview-and-setup 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 2mo 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.

better-auth/better-auth-overview-and-setup/SKILL.md · 85 lines

How it starts

The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Better Auth Overview And Setup

Use this skill for first-time Better Auth setup and top-level architecture choices.

Scope

  • installing better-auth
  • configuring BETTER_AUTH_SECRET and BETTER_AUTH_URL
  • mounting the auth handler in the target framework
  • creating the auth client
  • choosing between email/password, social auth, or plugins
  • deciding when a task belongs to sessions, OAuth, Next.js, or plugin-specific work

Default path

  1. Install better-auth in the server boundary and client boundary if they are separate.
  2. Configure a high-entropy BETTER_AUTH_SECRET and the correct app base URL.
  3. Create the server auth instance with betterAuth(...).
  4. Mount the handler at the framework's auth route.
  5. Create the client with createAuthClient(...) and the right baseURL or basePath.
  6. Turn on only the auth methods the app actually needs.
  7. If the task introduces plugins, plan for both server plugin wiring and client plugin wiring.

When to deviate

  • Customize the auth route only if the host framework or an existing app convention truly requires it.
  • Move to the Next.js skill when the work is mostly route protection or App Router integration.
  • Move to the social or plugin skills when the task introduces providers, organizations, SSO, or plugin-specific contracts.
  • Treat dynamic base URL handling as required when previews, multi-domain setups, or changing origins are in play.

Guardrails

  • Keep secrets server-only.
  • Do not guess the deployed base URL when previews or custom domains are involved.
  • Keep the auth route stable unless there is a strong reason to customize it.
  • Treat Better Auth as the auth boundary for sessions and provider callbacks instead of hand-rolling adjacent routes.
  • Use the official client package for the target environment (client, react, etc.) when hooks or reactive helpers are needed.

Common Routing Cues

  • Better Auth installation, betterAuth, createAuthClient, BETTER_AUTH_SECRET, BETTER_AUTH_URL, auth route setup, base URL, base path, auth handler

Read the full file on GitHub · 85 lines

Changes

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.

  1. 2mo ago First seen · 85 lines · 52 tokens per session scan A e6e253d93086

Subscribe to this mod's changes

better-auth-overview-and-setup is a skill published in the GitHub repository andrewsrigom/agent-skills (2 stars, last pushed 7mo ago), licensed MIT. It adds 52 tokens to every session and 805 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-31.

Backend and APIsSecurity
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