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Clients authenticate to protected servers with one of three strategies, passed via the auth option: 
import { Client, BearerAuth } from '@prefecthq/fastmcp-ts/client'

const client = await Client.connect('https://mcp.example.com', {
  auth: new BearerAuth(process.env.MCP_TOKEN!),
})
This page is under construction. The outline below sketches what it will cover.
  • BearerAuth — injects a static Authorization: Bearer <token> header into every request.
  • OAuth — wraps the transport’s fetch to attach the current token, refreshing automatically when near expiry; concurrent refreshes are coalesced into a single request.
  • ClientCredentials — machine-to-machine token acquisition via the client credentials grant.
  • Token storage — InMemoryStore and FileTokenStorage for persisting tokens across runs; per-server auth in multi-server configs.