_setup-auth-users

_setup-auth-users is a skill for Claude Code from flavien-ia/hypervibe-harness. It costs 87 tokens per session (2,769 once invoked), scanned A, original, Apache-2.0.

A helper for setting up email-and-password user accounts with NextAuth, an authentication library for web applications. It adds registration, sign-in, account deletion, and, when email is configured, password recovery; it can also offer Google or GitHub sign-in.

In plain words
What is it for?
Use it when an application needs database-backed signup, sign-in, account management, and optional password reset or social login.
Why use it?
It removes the need to build the main account and password flows from scratch for an application with multiple users.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: mentions CLAUDE.md; mentions Claude Code; mentions Codex.

Part of the hypervibe plugin — 86 skills, 1 hook, 1 MCP server shipped together

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.

agentmods
npx agentmods add skills/flavien-ia/hypervibe-harness/_setup-auth-users
Any agent
npx skills add flavien-ia/hypervibe-harness --skill _setup-auth-users
Clone the repo
git clone --depth 1 https://github.com/flavien-ia/hypervibe-harness

Made for: Claude Code.

Or install hypervibe, the plugin that ships this one along with the rest of its 86 skills, 1 hook, 1 MCP server.

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 _setup-auth-users

README.md
[![agentmods](https://agentmods.dev/badge/skills/flavien-ia/hypervibe-harness/_setup-auth-users.svg)](https://agentmods.dev/skills/flavien-ia/hypervibe-harness/_setup-auth-users)
Your own site
<a href="https://agentmods.dev/skills/flavien-ia/hypervibe-harness/_setup-auth-users"><img src="https://agentmods.dev/badge/skills/flavien-ia/hypervibe-harness/_setup-auth-users.svg" alt="Measured on agentmods" height="20"></a>
Per session 87 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,769 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00087 $0.02769
Opus 5 $0.00044 $0.01385
Sonnet 5 $0.00017 $0.00554
Haiku 4.5 $0.00009 $0.00277

Measured 6d ago against content hash 89ac299b357f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

_setup-auth-users 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 6d 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.

skills/_setup-auth-users/SKILL.md · 155 lines

How it starts

The opening of the file, as written. The whole thing — 155 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Setup Auth - User-credentials mode

Communication

  • Detect the user's language from the conversation (the user's own messages, anywhere in the session - not just this invocation: a bare slash command like /bootstrap carries no language signal by itself). If nothing in the conversation gives a signal, fall back to the OS locale (node -e "console.log(Intl.DateTimeFormat().resolvedOptions().locale)") before defaulting to English. ALWAYS reply in that language for every user-facing message: questions, progress, confirmations, summaries, errors - including any example text quoted in this skill, which is illustrative and must be translated, never sent verbatim.
  • Use plain, non-technical business language. Never expose internal script names (*.mjs) or jargon; describe actions in human terms.
  • When generating user-facing content for the scaffolded project (UI labels, emails, copy), write it in the user's language too.
  • Show progress as a short natural-language checklist (in-progress and done states).

Installs NextAuth in users mode: real accounts in the DB, signup/signin/account with delete, shadcn UI pages. If email is configured, it also adds forgot-password and reset-password.

The deterministic code (install deps, patch schema + Drizzle push, generation of auth.ts / password.ts / tRPC router / API route / UI pages, patches to trpc.ts to add rateLimitedProcedure + protectedProcedure if missing) lives in scripts/setup-auth-users.mjs. This SKILL only handles launching the script, the optional integration of the UserMenu into the layout (contextual, non-scriptable patch), CLAUDE.md, and the final summary.

Input variables (passed by add-auth): WEB_DIR, IS_MONOREPO, PROJECT_NAME.

⚠️ Fresh install only - the script refuses if src/server/auth.ts already exists. The "add users on top of an existing admin" case is driven by Claude from add-auth Step 0, NOT by this skill.


Step 1 - Launch the script

node "${CLAUDE_SKILL_DIR}/../../scripts/setup-auth-users.mjs" \
  --name "<PROJECT_NAME>" \
  --web-dir "<WEB_DIR>"

Read the full file on GitHub · 155 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. 6d ago First seen · 155 lines · 87 tokens per session scan A 89ac299b357f

Subscribe to this mod's changes

_setup-auth-users is a skill published in the GitHub repository flavien-ia/hypervibe-harness (37 stars, last pushed today), licensed Apache-2.0. It adds 87 tokens to every session and 2,769 once invoked, about $0.0004 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 2026-08-30.

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