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    SaaS Authentication & Authorization Implementation Skill

    1

    Architect and implement secure SaaS authentication, multi-tenant RBAC, and OIDC integration.

    $39.99

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    SaaS Authentication & Authorization Implementation Skill

    SaaS Authentication & Authorization Implementation Skill

    Example session with this skill installed

    I need a multi-tenant RBAC system for a Next.js app using Prisma and NextAuth. Roles are Admin, Editor, and Viewer. Admins manage users, Editors manage content within their tenant.

    • Read your context and instructions
    • Compiled the saas authentication

    The multi-tenant RBAC architecture has been designed for your Next.js and Prisma stack. This implementation focuses on tenant isolation at the database level and centralized middleware for permission checks.

    Multi-Tenant RBAC Implementation

    1. Data Model (Prisma Schema)

    model Tenant {
  id        String   @id @default(cuid())
  name      String
  users     User[]
  content   Content[]
}

model User {
  id        String   @id @default(cuid())
  email     String   @unique
  role      Role     @default(VIEWER)
  tenantId  String
  tenant    Tenant   @relation(fields: [tenantId], references: [id])
}

enum Role {
  ADMIN
  EDITOR
  VIEWER
}

model Content {
  id        String   @id @default(cuid())
  title     String
  tenantId  String
  tenant    Tenant   @relation(fields: [tenantId], references: [id])
}

    2. Authorization Logic

    // lib/auth-utils.ts
export const permissions = {
  'user:manage': ['ADMIN'],
  'content:create': ['ADMIN', 'EDITOR'],
  'content:read': ['ADMIN', 'EDITOR', 'VIEWER'],
};

export function hasPermission(userRole: Role, action: keyof typeof permissions) {
  return permissions[action].includes(userRole);
}

// Example Server Action / API Check
export async function updateContent(userId: string, tenantId: string, contentId: string) {
  const user = await db.user.findUnique({ where: { id: userId } });
  
  if (!user || user.tenantId !== tenantId) throw new Error("Unauthorized: Tenant mismatch");
  if (!hasPermission(user.role, 'content:create')) throw new Error("Forbidden: Insufficient role");
  
  // Proceed with tenant-scoped update
}

    Next steps

    • Update the next-auth session callback to include tenantId and role in the JWT.
    • Implement a global Prisma middleware or extension to automatically inject tenantId into all findMany queries.
    • Add integration tests to verify that an Editor from Tenant A cannot access Content from Tenant B.

    Connects securely to your tools. The creator never sees your data.

    About this skill

    Building SaaS authentication from scratch is a liability, but misconfiguring a library is just as dangerous. This skill provides the architectural oversight and implementation rigor of a senior security engineer to ensure your identity and access management is leak-proof.

    What it does

    • Identity Architecture designs multi-tenant or single-tenant data models for users, roles, and permissions.
    • Credential Security implements hardened password hashing, rate limiting, and secure recovery flows.
    • Protocol Integration scaffolds OAuth 2.0 and OpenID Connect flows using Authorization Code with PKCE.
    • Session Lifecycle defines secure cookie handling, token rotation, and revocation strategies.
    • Access Control builds centralized RBAC or ABAC middleware to prevent IDOR and privilege escalation.
    • Security Testing generates comprehensive test suites for auth boundary cases and tenant isolation.

    How it works

    1. Context Mapping defines your stack, tenant model, and identity provider requirements.
    2. Threat Modeling identifies specific trust boundaries and potential abuse vectors for your app.
    3. Core Scaffolding generates the implementation plan for registration, login, and session logic.
    4. Policy Enforcement creates the permission matrix and centralized authorization middleware.
    5. Validation runs a security audit against the implementation to verify controls before deployment.

    Frameworks & tools

    Works with any full-stack environment including Node.js, Python, Go, or Ruby. Supports managed providers like Auth0, Clerk, or Firebase, and self-hosted solutions using Passport.js, NextAuth, or Devise.

    Why this beats prompting it yourself

    Generic prompts often overlook critical session rotation, CSRF defenses, or tenant-level isolation checks. This skill enforces a security-first workflow that treats "deny-by-default" and "object-level authorization" as non-negotiable requirements rather than afterthoughts.

    Use cases

    • Designing a secure multi-tenant RBAC system for a B2B SaaS platform.
    • Integrating Social Login and OIDC while maintaining strict account linking rules.
    • Hardening existing password recovery and session management against account takeover.
    • Building custom authorization middleware to prevent horizontal privilege escalation.

    Known limitations

    Does not directly provision infrastructure or connect to live identity providers. Implementation security depends on the developer correctly applying the provided logic to their specific environment.

    Requires user-provided framework and SDK details. Guide only; does not host identity services or perform live deployments. Documentation-based, not a managed auth provider.

    How to use

    1. 1

      Connect your agent to the Agensi MCP

      Copy the prompt and paste it into Claude, ChatGPT, Cursor or any agent that supports MCP. It sets up the connection for you. Manual setup

    2. 2

      Sign in to Agensi

      Your agent shows a sign-in link. Sign in and click Allow.

    3. 3

      Ask for what you need

      Your agent loads this skill and uses it on your task. It always asks before any payment.

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    What's inside

    Frequently Asked Questions

    This skill provides the architectural blueprints and implementation logic for robust identity systems, including multi-tenant RBAC, OIDC integration, and secure session management, effectively acting as a virtual senior security engineer for your auth layer.

    The skill is framework-agnostic and provides logic compatible with major languages like Node.js, Python, and Go, as well as managed services like Clerk, Auth0, or custom implementations using NextAuth and Passport.js.

    You receive a comprehensive security implementation package including threat models, data schema designs for multi-tenancy, centralized authorization middleware, and automated test suites for verifying tenant isolation.

    Yes, this skill is specifically designed to handle complex multi-tenant scenarios, ensuring that users in one organization cannot access data from another through rigorous object-level authorization and IDOR prevention logic.

    While it generates the architectural logic and implementation code, it does not directly access your production environment or cloud infrastructure; a developer must review and apply the generated logic to their specific codebase.

    Unlike generic AI prompts, this skill enforces a 'deny-by-default' security posture and automatically includes critical safeguards like PKCE for OAuth flows, token rotation, and rate-limiting logic that are often missed.

    New in APIs & Backend