shoo-auth

shoo-auth is a skill for Claude Code, Codex from Firstp1ck/pi-coding-agent-forge. It costs 75 tokens per session (2,803 once invoked), scanned A, original, MIT.

A guide for working with Shoo, a Google sign-in service for browser applications, including login callbacks, sessions, and server-side token checks.

In plain words
What is it for?
Evaluating Shoo, implementing Google sign-in, configuring React or browser integrations, handling PKCE callbacks, checking sessions, and verifying identity tokens on a server.
Why use it?
It helps prevent mistakes in authentication flows, such as incorrect callback handling, session checks, token audiences, or Convex integration.

Skill for Claude CodeCodex

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/firstp1ck/pi-coding-agent-forge/shoo-auth
Any agent
npx skills add Firstp1ck/pi-coding-agent-forge --skill shoo-auth
Clone the repo
git clone --depth 1 https://github.com/Firstp1ck/pi-coding-agent-forge

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 shoo-auth

README.md
[![agentmods](https://agentmods.dev/badge/skills/firstp1ck/pi-coding-agent-forge/shoo-auth.svg)](https://agentmods.dev/skills/firstp1ck/pi-coding-agent-forge/shoo-auth)
Your own site
<a href="https://agentmods.dev/skills/firstp1ck/pi-coding-agent-forge/shoo-auth"><img src="https://agentmods.dev/badge/skills/firstp1ck/pi-coding-agent-forge/shoo-auth.svg" alt="Measured on agentmods" height="20"></a>
Per session 75 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,803 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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 $0.00075 $0.02803
Opus 5 $0.00037 $0.01401
Sonnet 5 $0.00015 $0.00561
Haiku 4.5 $0.00007 $0.00280

Measured 4d ago against content hash 06609d7f7fd4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

shoo-auth scanned grade A with 1 finding 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 4d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (tests/test_skill_contract.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -fsS https://shoo.dev/.well-known/openid-configuration
pi-skill-shoo-auth/skills/shoo-auth/SKILL.md · 214 lines

How it starts

The opening of the file, as written. The whole thing — 214 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Shoo Auth

Deterministic workflow for deciding when Shoo fits and for applying it safely. This draft is not enabled automatically.

Primary reference snapshot: references/shoo-docs-summary.md. Refresh the live Shoo docs before high-stakes or production decisions.

When to Use

Use this skill when the task mentions any of:

  • Shoo, shoo.dev, @shoojs/auth, @shoojs/react, window.Shoo, shoo.js, or pairwise_sub.
  • Adding minimal Google sign-in to a browser app without Google client registration.
  • Choosing between Shoo React, vanilla JS, framework-agnostic, hosted-script, or Convex integration.
  • Implementing or reviewing Shoo callback handling, PKCE flow, session/revocation checks, or server-side id_token verification.
  • Debugging Shoo audience, callback, storage, Convex JWT, or missing-PII issues.

Do not use this skill as the primary workflow for unrelated auth providers or generic OAuth/OIDC work, except to explicitly decide that Shoo is not a fit.

Do Not Use / Escalate

Do not recommend Shoo as the sole answer when requirements include:

  • Non-Google identity providers, passwords, enterprise SSO/SAML/SCIM, or rich hosted user management.
  • Server-only auth without a browser redirect flow.
  • Production authorization based only on browser-local identity, localStorage, or decoded-but-unverified JWT claims.
  • Security/compliance-critical auth where maturity, SLAs, audit evidence, or operational ownership must be established first.

When any of these apply, state the mismatch and either ask whether Shoo is still mandatory or recommend comparing established auth providers.

Inputs and Assumptions

Before changing code, determine these from the user or the project:

  • Frontend shape: React, Next.js, vanilla/static, Convex, or another browser client.
  • App origin for each environment, e.g. http://localhost:3000 and https://app.example.com.
  • Callback path and whether that path is served by the app/router.
  • Server/runtime that will verify Shoo id_tokens.
  • Whether PII (email, name, picture) is actually needed.
  • Package manager and existing auth/session conventions.

Read the full file on GitHub · 214 lines

Files

What ships with it

2 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.

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. 4d ago First seen · 214 lines · 75 tokens per session scan A 06609d7f7fd4

Subscribe to this mod's changes

shoo-auth is a skill published in the GitHub repository Firstp1ck/pi-coding-agent-forge (77 stars, last pushed today), licensed MIT. It adds 75 tokens to every session and 2,803 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.