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authentication

authentication is a skill for Claude Code from fullstack-phoenix/saas_kit. It costs 43 tokens per session (1,152 once invoked), scanned A, original, MIT.

A feature that adds user accounts to a Phoenix application, including sign-up, sign-in, profiles, and permissions based on roles such as user, admin, and superuser.

In plain words
What is it for?
Use it to add registration, login, role checks, administrator setup, profile fields, and optional email-confirmation requirements.
Why use it?
It provides the account and access-control foundation needed when different people must log in and have different permissions.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter.

not rated 2repo 4mo ago A scan 43 tokens original MIT

Good fit Use it to add registration, login, role checks, administrator setup, profile fields, and optional email-confirmation requirements.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/fullstack-phoenix/saas_kit/authentication
View source ↗ fullstack-phoenix/saas_kit
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 fullstack-phoenix/saas_kit --skill authentication
Clone the repo
git clone --depth 1 https://github.com/fullstack-phoenix/saas_kit

Made for: Claude Code.

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 authentication

README.md
[![agentmods](https://agentmods.dev/badge/skills/fullstack-phoenix/saas_kit/authentication/github.svg)](https://agentmods.dev/skills/fullstack-phoenix/saas_kit/authentication)
Your own site
<a href="https://agentmods.dev/skills/fullstack-phoenix/saas_kit/authentication"><img src="https://agentmods.dev/badge/skills/fullstack-phoenix/saas_kit/authentication/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 authentication

Your own site · 80×15
<a href="https://agentmods.dev/skills/fullstack-phoenix/saas_kit/authentication"><img src="https://agentmods.dev/badge/skills/fullstack-phoenix/saas_kit/authentication.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,152 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 $0.00043 $0.01152
Opus 5.5 $0.00017 $0.00461
Sonnet 5.5 $0.00009 $0.00230
Haiku 4.5 $0.00004 $0.00115

Measured 2mo ago against content hash 1ed7e60f72ce, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

authentication 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.

skills/authentication/SKILL.md · 122 lines

How it starts

The opening of the file, as written. The whole thing — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.

User Authentication

Generates a complete authentication system on top of Phoenix's mix phx.gen.auth, then extends the User schema with role-based access control (:user, :admin, :superuser), profile fields (name, locale, timezone), an embedded data field, and soft-delete/anonymization. This is the core foundation most other features build on.

When to use

  • The app needs users who can register, log in, and be authorized by role.
  • You want admin/superuser bootstrapping out of the box (first signup becomes superuser; listed emails become admins).
  • Don't reach for this if the app is single-tenant with no login — and install it before teams, oauth, payments, or anything that references users.

Dependencies

  • Requires: None (this is a core feature, position 4 — install early).
  • Recommended: None. Pair with require_confirmed_user via the install decision below if you want email confirmation gating.

Install

mix saaskit.feature.install authentication

The installer runs mix phx.gen.auth Users User users --live, then injects the extra fields, changesets, and config. It asks one decision:

  • Require email confirmation? (email_confirmation) — when yes, installs the require_confirmed_user feature, which redirects authenticated-but-unconfirmed users to /users/confirm. OAuth sign-ins are auto-confirmed and skip the gate.
mix saaskit.feature.install authentication --decision email_confirmation=require_confirmed_user

What it generates

  • mix phx.gen.auth Users User users --live scaffolding — users table, auth logic, and LiveView sign-in/registration components.
  • Migration priv/repo/migrations/*_add_additional_fields_to_users.exs — adds deleted_at, role, name fields, locale, timezone, and embedded data.
  • Extends lib/my_app/users/user.ex:
    • role enum (:user, :admin, :superuser), profile fields, embeds_one :data.
    • maybe_set_admin_role/1 — auto-assigns roles from config.
    • update_changeset/2 (profile-only, never email/password), data_changeset/2, anonymize_changeset/1.
  • Extends lib/my_app/users.ex with update_user/2, change_user/2, anonymize_user/1.
  • Adds tests in test/my_app/users_test.exs.

Read the full file on GitHub · 122 lines

Files

What ships with it

1 file 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.

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 · 122 lines · 43 tokens per session scan A 1ed7e60f72ce

Subscribe to this mod's changes

authentication is a skill published in the GitHub repository fullstack-phoenix/saas_kit (2 stars, last pushed 4mo ago), licensed MIT. It adds 43 tokens to every session and 1,152 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.

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