agentmods.dev

flutter-auth

A set of instructions for implementing authentication in Flutter, including login, logout, tokens, sessions, and optional biometric checks such as fingerprint or face authentication.

In plain words
What is it for?
Use it when building sign-in flows, logout, access and refresh tokens, session status, authentication guards, secure token storage, or biometric sign-in.
Why use it?
It defines how authentication parts should interact and prevents problems such as multiple simultaneous token refreshes after expired sessions.

Skill for Claude CodeCodex

5 2mo ago A scan 68 tokens original MIT
View the source file yendangn/flutter-app-builder
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/yendangn/flutter-app-builder/flutter-auth
Any agent
npx skills add yendangn/flutter-app-builder --skill flutter-auth
Clone the repo
git clone --depth 1 https://github.com/yendangn/flutter-app-builder

Made for: Claude Code, Codex.

Per session 68 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 516 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 $0.00068 $0.00516
Opus 5 $0.00034 $0.00258
Sonnet 5 $0.00014 $0.00103
Haiku 4.5 $0.00007 $0.00052

Measured 2d ago against content hash a4210f4234fe, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

flutter-auth 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 2d 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/flutter-auth/SKILL.md · 46 lines

What it actually says

Flutter Auth

Full reference: template.md

Files

lib/src/core/auth/
  auth_service.dart           ← interface (login, logout, refreshToken, status stream)
  auth_service_impl.dart      ← implementation (only file importing auth packages)
  auth_status.dart            ← enum: unknown | authenticated | unauthenticated
  token_manager.dart          ← interface (get/set/clear access + refresh token)
  token_manager_impl.dart     ← wraps SecureStorage
  biometric_service.dart      ← interface (isAvailable, authenticate)
  biometric_service_impl.dart ← only file importing local_auth
lib/src/features/auth/
  domain/repositories/auth_repository.dart   ← feature-level contract
  data/repositories/auth_repository_impl.dart← delegates to AuthService
  domain/usecases/sign_in_usecase.dart
  domain/usecases/logout_usecase.dart
  domain/usecases/observe_auth_status_usecase.dart
  presentation/cubit/auth_cubit.dart         ← drives the auth guard
  presentation/cubit/sign_in_cubit.dart

Key rules

  • AuthService.status is a broadcast stream — multiple listeners are valid.
  • Token refresh uses a Completer to coalesce concurrent 401s — only one refresh in flight at a time.
  • Auth interceptor: on 401 → call authService.refreshToken() → retry original request. On refresh failure → authService.logout().
  • AuthCubit listens to ObserveAuthStatusUseCase stream and emits AuthAuthenticated/AuthUnauthenticated — the router redirect reads this state.
  • BiometricService result is checked before calling AuthService.login() — biometric is a pre-auth gate, not a replacement.
  • Never store tokens in SharedPreferences — always SecureStorage.

Co-load with

  • flutter-storage — SecureStorage for tokens
  • flutter-network — auth interceptor wired into DioClient
  • flutter-routing — auth guard in GoRouter
  • flutter-di — AuthService, TokenManager, BiometricService registration
Files

What ships with it

11 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. 2d ago First seen · 46 lines · 68 tokens per session scan A a4210f4234fe

Subscribe to this mod's changes

flutter-auth is a skill published in the GitHub repository yendangn/flutter-app-builder (5 stars, last pushed 2mo ago), licensed MIT. It adds 68 tokens to every session and 516 once invoked, about $0.0003 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 2026-08-31.

MobileSecurity
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