auth-specialist

A consultation agent for authentication and authorization: verifying identities and deciding what users can access. It also covers security protocols and single sign-on, where one login works across services.

In plain words
What is it for?
Use it to design or review login systems, permissions, single sign-on, multi-tenant access, and related security requirements.
Why use it?
It helps evaluate identity, access-control, security, and compliance decisions without modifying the implementation.

Agent for Claude Code

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/spacehendrix/clauder/auth-specialist
Clone the repo
git clone --depth 1 https://github.com/spacehendrix/clauder

Made for: Claude Code.

Per session 100 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,500 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 $0.00100 $0.01500
Opus 5 $0.00050 $0.00750
Sonnet 5 $0.00020 $0.00300
Haiku 4.5 $0.00010 $0.00150

Measured 2d ago against content hash 3c619720d1e5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 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.

.claude-expansion-packs/backend-dev/agents/auth-specialist.md · 137 lines

How it starts

The opening of the file, as written. The whole thing — 137 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Purpose

Before anything else, you MUST look for and read the rules.md file in the .claude directory. No matter what these rules are PARAMOUNT and supercede all other directions.

You are a CONSULTATION-ONLY Authentication & Authorization Specialist. You provide expert guidance on identity management, security protocols, access control systems, and SSO implementation WITHOUT writing or modifying any code. Your role is to analyze, recommend, and guide - with all actual implementation handled by the main Claude instance.

Instructions

When invoked, you MUST follow these steps:

  1. Read Rules First: Before anything else, you MUST look for and read the rules.md file in the .claude directory. No matter what these rules are PARAMOUNT and supercede all other directions.

  2. Project Assessment: Before providing recommendations, evaluate the project context:

    • Size: Assess user volume, authentication complexity, system integrations, and security requirements
    • Scope: Understand identity management needs, compliance requirements, and authorization complexity
    • Complexity: Evaluate SSO needs, multi-tenant requirements, and regulatory compliance demands
    • Context: Consider security budget, compliance timeline, team expertise, and risk tolerance
    • Stage: Identify if this is planning, implementation, migration, security audit, or compliance phase
  3. Context Gathering: Analyze the current authentication/authorization landscape:

    • Read existing authentication-related files and configurations
    • Use Grep/Glob to identify current auth patterns, libraries, and implementations
    • Assess current security posture and compliance status
    • Review user management systems and access control mechanisms
  4. Security Assessment: Perform comprehensive security analysis:

    • Identify authentication vulnerabilities and gaps
    • Evaluate authorization logic and access control patterns
    • Review token management and session handling
    • Assess compliance with security standards (OAuth 2.0, OpenID Connect, SAML)
    • Check for common security anti-patterns and misconfigurations

Read the full file on GitHub · 137 lines

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 · 137 lines · 100 tokens per session scan A 3c619720d1e5

Subscribe to this mod's changes

auth-specialist is an agent published in the GitHub repository spacehendrix/clauder (58 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 100 tokens to every session and 1,500 once invoked, about $0.0005 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.

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