AUTHORIZATION FOR MODEL CONTEXT PROTOCOL

Secure your MCP servers with cidaas MCP Authorization

OAuth 2.1. PKCE. Dynamic Client Registration. Protected Resource Metadata. DPoP. Resource Indicators. Everything the MCP spec requires for the safe use of AI.

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OAuth 2.1 OAuth 2.1
PKCE
Dynamic Client Registration
RFC 9728 PRM
DPoP
Resource Indicators
EU sovereign EU sovereign

The Model Context Protocol (MCP) standardizes secure communication between AI models, agents, and external tools or APIs. cidaas MCP Authorization secures these interactions using modern OAuth and Zero Trust mechanisms – enabling controlled, traceable, and production-ready AI integration.

THE MCP AUTHORIZATION PROBLEM

Anyone can stand up an MCP server,
securing one is harder

The MCP specification relies on OAuth standards for secure server-to-agent communication. However, implementing authorization, trust, and token handling remains complex.

What MCP Authorization requires

  • A working OAuth 2.1 authorization server.
  • Dynamic Client Registration so MCP clients can self-register.
  • Protected Resource Metadata for discovery.
  • PKCE on every authorization code flow.
  • Audience-bound, short-lived access tokens.
  • Optional DPoP for sender-constrained tokens.

Why build it on cidaas

cidaas enhances MCP with enterprise-level authorization features: OAuth 2.1, dynamic client registration, token policies, auditability, and centralized access control for AI agents and tools. Existing MCP servers can be secured without the need for a complete rearchitecture and integrated into existing IAM, compliance, and security processes.

Full coverage of MCP Authorization requirements

Every capability mapped to a public RFC or OpenID Foundation spec. No proprietary handshakes.

Required by the MCP spec

CAPABILITY
STANDARD
STATUS
OAuth 2.1 authorization server
draft-ietf-oauth-v2-1
Production
Authorization Code + PKCE
RFC 7636
Production
Dynamic Client Registration
RFC 7591 / 7592
Production
Protected Resource Metadata
RFC 9728
Production
Authorization Server Metadata
RFC 8414
Production
Audience-bound tokens
RFC 8707
Production
Bearer token usage
RFC 6750
Production

Recommended for hardened deployments

CAPABILITY
STANDARD
STATUS
DPoP
RFC 9449
Production
Pushed Authorization Requests (PAR)
RFC 9126
Production
JWT-secured Authorization Requests (JAR)
RFC 9101
Production
mTLS client authentication
RFC 8705
Production
private_key_jwt client auth
RFC 7523
Production
FAPI 2.0 profile
OpenID Foundation
Certified

Emerging agentic standards

CAPABILITY
STANDARD
STATUS
Identity Assertion Authorization Grant
draft-ietf-oauth-identity-assertion-authz-grant
⟳ Roadmap
Cross-domain Identity Mediation (CIMD)
Emerging
⦿ Tracking
Agent-to-Agent (A2A) trust
Emerging
Patterns supported
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HOW IT WORKS

Drop cidaas in front of any MCP server

Standards-based discovery, registration, and authorization – no SDK lock-in.

MCP Client Claude · ChatGPT · Cursor /.well-known discovery cidaas OAuth 2.1 Auth Server your-tenant.cidaas.eu MCP Server Resource Server your-mcp.example.com 1. Initial request → 401 + RFC 9728 metadata pointer 2. Discover AS 3. POST /register (DCR) 4. Auth code + PKCE → token 5. Tool invocation → audience-bound bearer token
Step 1 of 5

Every step is standards-based. No proprietary handshake. No vendor SDK required.

From zero to authenticated MCP in three steps

Configure your MCP server, let clients self-register, validate tokens.

01

Configure your MCP server

Point your MCP server's WWW-Authenticate challenge at cidaas. Your .well-known/oauth-protected-resource document points to your cidaas tenant.

02

Let MCP clients self-register

cidaas exposes RFC 7591 dynamic client registration at /register. MCP clients (Claude Desktop, ChatGPT, Cursor) discover and register automatically.

03

Validate tokens

Validate access tokens via JWT signature verification or RFC 7662 introspection — whichever fits your runtime.

What MCP doesn't cover yet - and cidaas does

The MCP Authorization spec defines authentication and basic scoping. Production MCP deployments need more.

Per-tool consent

The user grants the agent access to read_calendar but denies delete_email. cidaas records granular per-tool consent and enforces it on every invocation — not just at the OAuth grant step.

Multi-tenant isolation

Your MCP server serves customers across tenants. cidaas tokens carry tenant context, and authorization policies enforce tenant boundaries — no cross-tenant data leak from a misconfigured tool.

Human-in-the-loop approval

Some tool invocations are too sensitive for autonomous execution. cidaas integrates CIBA for out-of-band human approval.

Audit and forensics

Every token issuance, consent grant, tool invocation, and policy decision captured in an immutable audit log. Tied to both the user (sponsor) and the agent (workload). DORA, NIS2, and GDPR-ready.

Revocation at machine speed

Agents act fast. So does revocation. cidaas supports instant token revocation (RFC 7009), consent withdrawal, and certificate invalidation — propagated within seconds.

Cross-server consistency

Run multiple MCP servers behind one cidaas tenant. Consistent identity, consistent policy, consistent audit — across every MCP endpoint your organization exposes.

INTEROPERABILITY

MCP Authorization works with every MCP client

cidaas is a standards-compliant OAuth 2.1 authorization server. Every MCP client that implements the spec works out of the box.

Claude Desktop

Anthropic's native desktop AI assistant

ChatGPT

OpenAI's conversational AI platform

Cursor

AI-powered code editor by Anysphere

Custom Agents

LangChain, CrewAI & AutoGen

No SDK lock-in. No proprietary auth flow. If it speaks OAuth 2.1, it speaks cidaas.

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Data that never leaves the EU

Digital sovereignty starts with control over identity and authorization data.

cidaas enables secure MCP authentication and authorization with exclusive European hosting, transparent processing, and enterprise-grade compliance.

Secure lock
AuthZEN AuthZEN
OAuth OAuth
EU EU Only
OIDC OIDC
Hosted in EU
Sovereign

MCP Authorization as it should be.
Hosted in Europe.

Talk to our team about deploying cidaas as your MCP authorization server - production-ready in days, not months.

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FAQs: MCP Authorization

cidaas implements the full MCP Authorization Spec: OAuth 2.1 with PKCE, Dynamic Client Registration (RFC 7591), Protected Resource Metadata (RFC 9728), Authorization Server Metadata (RFC 8414), Resource Indicators (RFC 8707), and Bearer token usage (RFC 6750). We additionally support DPoP, PAR, JAR, and mTLS client authentication for hardened deployments.
Yes. cidaas is a standards-compliant OAuth 2.1 server. Configure your MCP server's .well-known/oauth-protected-resource document to point at your cidaas tenant, and any MCP client will route authorization through cidaas automatically.
Yes - RFC 7591 and RFC 7592. MCP clients can register at runtime without manual configuration. You can also enforce client registration policies such as allow-listed redirect URIs, required metadata, and scope restrictions.
cidaas supports agent-to-agent delegation patterns today and is tracking the IETF ID-JAG draft for standardized identity assertion grants.
Yes. cidaas is FAPI 2.0 certified, meaning it meets the highest OAuth security profile for financial and regulated environments.
The MCP spec profiles OAuth 2.1 by requiring PKCE, Dynamic Client Registration, Protected Resource Metadata, and audience-bound tokens, along with MCP-specific discovery flows.
Yes. Every MCP client that implements the authorization spec works with cidaas - including Claude Desktop, ChatGPT, Cursor, and custom agent frameworks.
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