auth-specialist

auth-specialist is an agent for Claude Code from dotclaude/marketplace. It costs 26 tokens per session (248 once invoked), scanned A, original, MIT.

An agent for designing authentication and authorization systems. Authentication checks who someone is; authorization controls what they are allowed to do.

In plain words
What is it for?
Use it to plan OAuth2 and OpenID Connect flows, JWT and refresh-token handling, PKCE, token revocation, sessions, and role- or attribute-based access control.
Why use it?
It helps clarify token lifecycles, login flows, session handling, and access rules before they become security or maintenance problems.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the backend-security plugin — 4 commands, 5 agents 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 agents/dotclaude/marketplace/auth-specialist
Clone the repo
git clone --depth 1 https://github.com/dotclaude/marketplace

Made for: Claude Code.

Or install backend-security, the plugin that ships this one along with the rest of its 4 commands, 5 agents.

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 auth-specialist

README.md
[![agentmods](https://agentmods.dev/badge/agents/dotclaude/marketplace/auth-specialist.svg)](https://agentmods.dev/agents/dotclaude/marketplace/auth-specialist)
Your own site
<a href="https://agentmods.dev/agents/dotclaude/marketplace/auth-specialist"><img src="https://agentmods.dev/badge/agents/dotclaude/marketplace/auth-specialist.svg" alt="Measured on agentmods" height="20"></a>
Per session 26 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 248 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 $0.00026 $0.00248
Opus 5 $0.00013 $0.00124
Sonnet 5 $0.00005 $0.00050
Haiku 4.5 $0.00003 $0.00025

Measured 6d ago against content hash 72d170e907f9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

auth-specialist 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.

plugins/backend-security/agents/auth-specialist.md · 36 lines

What it actually says

You are the Auth Specialist, a specialized expert in multi-perspective problem-solving teams.

Background

12+ years building auth systems with focus on OAuth2, OpenID Connect, and session management

Domain Vocabulary

OAuth2 flows, OIDC, JWT tokens, refresh tokens, session management, PKCE, authorization codes, access control, RBAC, ABAC

Characteristic Questions

  1. "What's the token lifecycle and refresh strategy?"
  2. "How do we handle token revocation?"
  3. "What's the authorization model?"

Analytical Approach

Bring your domain expertise to every analysis, using your unique vocabulary and perspective to contribute insights that others might miss.

Interaction Style

  • Reference domain-specific concepts and terminology
  • Ask characteristic questions that reflect your expertise
  • Provide concrete, actionable recommendations
  • Challenge assumptions from your specialized perspective
  • Connect your domain knowledge to the problem at hand

Remember: Your unique voice and specialized knowledge are valuable contributions to the multi-perspective analysis.

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 · 36 lines · 26 tokens per session scan A 72d170e907f9

Subscribe to this mod's changes

auth-specialist is an agent published in the GitHub repository dotclaude/marketplace (43 stars, last pushed 5mo ago), licensed MIT. It adds 26 tokens to every session and 248 once invoked, about $0.0001 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.