The request names Auth0 and Fastify, so Auth0 comes first: its page describes an authentication and authorization platform 1, and its indexed actions include auth0-fastify-api for protecting Fastify endpoints with JWT Bearer validation and scope checks 1. Alternatives that cover JWT-protected APIs and authentication are Better Auth 10, Supabase 8 and Shopify Dev Docs 7, which list JWT and auth actions.
- 1
Auth0auth0.comverified and signed
Auth0 is an authentication and authorization platform, and its indexed action auth0-fastify-api integrates @auth0/auth0-fastify to validate JWT Bearer tokens and check scopes on Fastify API endpoints 1; its official MCP server is Auth0 MCP Server 1.
official:MCP server · Auth0 MCP Server+20 community tools built for it
for agents: auth0-fastify-api · auth0-fastapi-api · auth0-fastify
- 2
Better Authbetter-auth.comfound in code, not yet checked
Better Auth is a TypeScript authentication framework whose create-auth action scaffolds authentication in JavaScript apps and whose sign_jwt action signs agent JWTs 10.
for agents: sign_jwt · create-auth · create-auth-skill
- 3
Supabasesupabase.comverified and signed
Supabase is a Postgres development platform with Authentication and instant APIs, and its @supabase/auth-js SDK handles user auth 8.
official:SDK · @supabase/auth-jslibrary · Supabase CLI ActionCLI · supabasepackage · Supabaserepository · supabase+106 community tools built for it
for agents: auth · authentication · supabase
- 4
Shopify Dev Docsshopify.devverified and signed
Shopify Dev Docs lists JWT and Node actions for building apps, though its page does not describe Fastify or API token validation directly 7.
official:MCP server · @shopify/dev-mcpSDK · @shopify/admin-api-clientCLI · toxiproxypackage · @shopify/ucp-clirepository · ucp-proxy+137 community tools built for it
for agents: jwt · node · node
Sources
- 1Secure AI Agent & User Authentication | Auth0auth0.com · read 2026-10-29
- 7Shopify Dev Docsshopify.dev · read 2026-10-29
- 8Supabase | The Postgres Development Platformsupabase.com · read 2026-10-29
- 10Better Authbetter-auth.com · read 2026-10-29
For agents: the 10 actions behind this answer
auth0-fastify-api · auth0-fastify-api verified and signed
Use when protecting Fastify API endpoints with JWT Bearer token validation or scope checks. Integrates @auth0/auth0-fastify-api for stateless APIs receiving access tokens from frontends or mobile apps.
createAuthToken · Vercel API verified and signed
Create an Auth Token
get_user_info · sherpa found in code, not yet checked
Get user information (secure version with JWT auth).
2.0 · oauth2client verified and signed
typespec-create-api-plugin · typespec-create-api-plugin verified and signed
Generate a TypeSpec API plugin with REST operations, authentication, and Adaptive Cards for Microsoft 365 Copilot
aws-amplify · aws-amplify verified and signed
Build full-stack apps with AWS Amplify Gen 2 using guided workflows for authentication, data models, storage, GraphQL APIs, and Lambda functions.
jwt · @shopify/shopify-api verified and signed
auth · @supabase/auth-js verified and signed
get_application_auth_methods_v2 · Cloudflare API verified and signed
Get auth methods
sign_jwt · agent-auth found in code, not yet checked
Sign an agent JWT manually. Rarely needed — execute_capability signs JWTs automatically. Only use for custom integrations that need a raw token.
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