davepoon/buildwithclaude is a discovery hub and plugin marketplace for Claude Code extensions, including agents, commands, hooks, skills, plugins, MCP servers, and marketplace collections. Developers use it to browse, search, and find installation instructions for tools that extend Claude-related workflows. Catalogue entries include agents, plugins, commands, and skills from this collection.
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.
npx agentmods add commands/davepoon/buildwithclaude/add-authentication-systemgit clone --depth 1 https://github.com/davepoon/buildwithclaudeWrote 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.
[](https://agentmods.dev/commands/davepoon/buildwithclaude/add-authentication-system)<a href="https://agentmods.dev/commands/davepoon/buildwithclaude/add-authentication-system"><img src="https://agentmods.dev/badge/commands/davepoon/buildwithclaude/add-authentication-system.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00005 | $0.00687 |
| Opus 5 | $0.00003 | $0.00344 |
| Sonnet 5 | $0.00001 | $0.00137 |
| Haiku 4.5 | $0.00001 | $0.00069 |
Grade A, and why
add-authentication-system 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 today.
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.
How it starts
The opening of the file, as written. The whole thing — 83 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Add Authentication System
Implement secure user authentication system
Instructions
-
Authentication Strategy Analysis
- Analyze application requirements and user types
- Define authentication methods (password, OAuth, SSO, MFA)
- Assess security requirements and compliance needs
- Plan user management and role-based access control
- Evaluate existing authentication infrastructure and integration points
-
Authentication Method Selection
- Choose appropriate authentication strategies:
- Username/Password: Traditional credential-based authentication
- OAuth 2.0/OpenID Connect: Third-party authentication (Google, GitHub, etc.)
- SAML: Enterprise single sign-on integration
- JWT: Stateless token-based authentication
- Multi-Factor Authentication: SMS, TOTP, hardware tokens
- Passwordless: Magic links, WebAuthn, biometric authentication
- Choose appropriate authentication strategies:
-
User Management System
- Set up user registration and account creation workflows
- Configure user profile management and data storage
- Implement password policies and security requirements
- Set up account verification and email confirmation
- Configure user deactivation and account deletion procedures
-
Authentication Implementation
- Implement secure password hashing (bcrypt, Argon2, scrypt)
- Set up session management and token generation
- Configure secure cookie handling and CSRF protection
- Implement authentication middleware and route protection
- Set up authentication state management (client-side)
-
Authorization and Access Control
- Implement role-based access control (RBAC) system
- Set up permission-based authorization
- Configure resource-level access controls
- Implement dynamic authorization and policy engines
- Set up API endpoint protection and authorization
-
Multi-Factor Authentication (MFA)
- Configure TOTP-based authenticator app support
- Set up SMS-based authentication codes
- Implement backup codes and recovery mechanisms
- Configure hardware token support (FIDO2/WebAuthn)
- Set up MFA enforcement policies and user experience
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.
- today First seen · 83 lines · 5 tokens per session scan A 97a75b10b9ae
add-authentication-system is a command published in the GitHub repository davepoon/buildwithclaude (3,415 stars, last pushed yesterday), licensed MIT. It adds 5 tokens to every session and 687 once invoked, about $0.0000 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 2026-09-05.
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