What can mcp-auth do?

oauth 2.0 / openid connect server integration for mcp, plug-and-play authentication middleware for mcp servers, multi-provider identity federation for mcp clients, jwt token validation and claims extraction for mcp, api key authentication and validation for mcp, credential refresh and token lifecycle management for mcp, authentication error handling and challenge responses for mcp, configuration management for authentication providers

mcp-auth

MCP ServerFree

Plug and play auth for Model Context Protocol (MCP) servers

Open Source

/ 100

8 capabilities

Capabilities8 decomposed

oauth 2.0 / openid connect server integration for mcp

Medium confidence

Enables MCP servers to authenticate clients using industry-standard OAuth 2.0 and OpenID Connect (OIDC) protocols. Implements authorization code flow, token validation, and identity provider integration patterns, allowing MCP servers to delegate authentication to external identity providers (Auth0, Okta, Google, etc.) rather than managing credentials directly. Abstracts provider-specific OAuth/OIDC implementations behind a unified MCP-compatible interface.

Solves for

I want my MCP server to require OAuth authentication without building auth from scratchI need to integrate my MCP server with an existing identity provider like Auth0 or OktaI want to support multiple OAuth providers (Google, GitHub, Microsoft) in a single MCP serverI need to validate and refresh OAuth tokens for MCP client requests

Best for

Teams deploying MCP servers in enterprise environments with existing identity infrastructure

Developers building multi-tenant MCP applications requiring user isolation

Organizations migrating from REST APIs to MCP and needing to preserve OAuth authentication

Requires

Node.js 16+ or compatible JavaScript runtime

OAuth 2.0 / OIDC provider with application credentials (client ID, client secret)

MCP server framework (e.g., @modelcontextprotocol/sdk)

Limitations

Requires pre-configured OAuth application credentials from identity provider

Token refresh logic depends on provider's token expiration policies — no universal refresh strategy

PKCE support and implicit flow handling varies by provider integration

What makes it unique

Purpose-built for MCP protocol's request/response model rather than HTTP-centric OAuth flows; abstracts OAuth complexity into MCP-native capability handlers, allowing servers to authenticate clients within the MCP message transport layer

vs alternatives

Simpler than implementing OAuth manually in MCP servers and more MCP-native than adapting generic OAuth libraries designed for HTTP REST APIs

plug-and-play authentication middleware for mcp servers

Medium confidence

Provides pre-built, composable authentication middleware that can be attached to MCP server request handlers with minimal configuration. Implements middleware pattern for intercepting MCP requests, validating credentials, and enforcing authentication policies before tools/resources are exposed. Supports declarative configuration of which MCP capabilities require authentication and what credential types are accepted.

Solves for

I want to add authentication to my MCP server without rewriting request handling logicI need to enforce different auth policies on different MCP tools or resourcesI want to quickly prototype an authenticated MCP server with minimal boilerplateI need to support multiple authentication methods (OAuth, API keys, JWT) on the same server

Best for

Developers building MCP servers who want authentication without architectural changes

Teams prototyping authenticated MCP applications quickly

Solo developers managing multiple MCP servers with consistent auth policies

Requires

MCP server framework with middleware/handler support

Node.js 16+

Authentication provider or credential store (OAuth provider, API key database, etc.)

Limitations

Middleware composition order matters — incorrect ordering can bypass auth checks

No built-in rate limiting or brute-force protection — requires additional middleware

Credential caching strategy is application-dependent; no universal caching layer

What makes it unique

Designed as drop-in middleware for MCP's request/response cycle rather than HTTP-layer middleware; integrates directly with MCP server's capability handler chain, allowing per-tool authentication policies

vs alternatives

Faster to implement than custom auth logic in each MCP tool and more flexible than monolithic authentication layers that apply uniformly to all server capabilities

multi-provider identity federation for mcp clients

Medium confidence

Abstracts authentication across multiple identity providers (Auth0, Okta, Google, GitHub, custom OIDC) behind a unified client interface. Handles provider-specific OAuth flows, token formats, and claim mappings, normalizing user identity into a standard schema regardless of which provider authenticated the user. Enables MCP clients to connect to servers that support multiple authentication sources without provider-specific logic.

Solves for

I want my MCP client to work with servers authenticated by different identity providersI need to support users logging in via Google, GitHub, or corporate SSO in the same applicationI want to normalize user identity claims from different providers into a consistent formatI need to switch identity providers without changing client code

Best for

Multi-tenant MCP applications serving users from different organizations

Teams building MCP clients that need to work across enterprise and consumer identity providers

Developers migrating from one identity provider to another

Requires

Configuration for each supported identity provider (client ID, discovery URL, etc.)

Network access to all configured identity providers

MCP client framework with authentication hook support

Limitations

Provider-specific claims (roles, groups, permissions) may not map cleanly across providers

Token formats vary (JWT vs opaque) — requires provider-specific validation logic

No automatic provider discovery — requires explicit configuration for each provider

What makes it unique

Implements identity federation at the MCP protocol level, normalizing user identity across providers before MCP requests are processed, rather than handling federation at the HTTP/transport layer

vs alternatives

Simpler than building provider-specific auth logic in each MCP client and more flexible than single-provider OAuth libraries

jwt token validation and claims extraction for mcp

Medium confidence

Validates JWT tokens passed in MCP requests, verifies signatures against provider public keys, and extracts claims for authorization decisions. Implements JWT validation patterns including signature verification, expiration checking, issuer validation, and audience validation. Supports both symmetric (HS256) and asymmetric (RS256, ES256) signing algorithms and handles key rotation from OIDC discovery endpoints.

Solves for

I need to validate JWT tokens in MCP requests before processing themI want to extract user claims from JWTs to make authorization decisionsI need to verify JWT signatures against an identity provider's public keysI want to handle JWT key rotation automatically from OIDC discovery

Best for

MCP servers using JWT-based authentication with external identity providers

Teams implementing fine-grained authorization based on JWT claims

Applications requiring cryptographic token validation

Requires

JWT token in MCP request (typically in Authorization header or metadata)

Access to identity provider's public keys or OIDC discovery endpoint

JWT validation library (e.g., jsonwebtoken, jose)

Limitations

Requires access to provider's public keys (via OIDC discovery or manual configuration)

No built-in token caching — each validation requires signature verification

Clock skew between client and server can cause valid tokens to be rejected

What makes it unique

Integrates JWT validation directly into MCP request processing pipeline, allowing per-request token validation without external HTTP calls, and supports OIDC key rotation for automatic key management

vs alternatives

More efficient than calling external token validation endpoints for every MCP request and more secure than trusting unvalidated tokens

api key authentication and validation for mcp

Medium confidence

Implements API key-based authentication for MCP clients, supporting key generation, validation, and revocation. Handles API key storage (hashed in database), lookup, and validation against incoming MCP requests. Supports key scoping (limiting keys to specific tools/resources) and expiration policies. Provides simpler alternative to OAuth for service-to-service MCP communication.

Solves for

I want to issue API keys to MCP clients for programmatic accessI need to validate API keys in MCP requests without external identity provider callsI want to revoke compromised API keys immediatelyI need to scope API keys to specific MCP tools or resources

Best for

MCP servers supporting service-to-service authentication

Teams building internal MCP tools that don't need full OAuth complexity

Applications requiring simple, fast API key validation

Requires

Persistent key storage (database, file system, or key management service)

Key generation mechanism (cryptographically secure random string generation)

MCP server with request metadata access

Limitations

API keys are static credentials — no automatic refresh like OAuth tokens

Key rotation requires manual client updates

No built-in key expiration enforcement — requires application logic

What makes it unique

Provides lightweight API key validation without external provider dependencies, enabling offline MCP authentication and supporting key scoping at the MCP capability level

vs alternatives

Faster and simpler than OAuth for internal service-to-service MCP communication and doesn't require external identity provider availability

credential refresh and token lifecycle management for mcp

Medium confidence

Manages OAuth token refresh, expiration tracking, and credential lifecycle for MCP clients and servers. Automatically refreshes expired tokens using refresh tokens, handles token rotation, and maintains credential state across MCP sessions. Implements exponential backoff for failed refresh attempts and provides hooks for credential update events.

Solves for

I want my MCP client to automatically refresh expired OAuth tokensI need to handle token expiration gracefully without interrupting MCP communicationI want to track when credentials expire and refresh them proactivelyI need to rotate credentials securely without dropping active MCP connections

Best for

Long-running MCP client applications that need persistent authentication

MCP servers managing credentials for downstream service calls

Teams requiring automatic credential rotation for security compliance

Requires

OAuth provider supporting refresh tokens

Persistent state storage for refresh tokens (secure, encrypted)

Timer/scheduler for proactive token refresh

Limitations

Refresh token availability depends on OAuth provider — not all providers support refresh tokens

Refresh token rotation (provider-issued new refresh tokens) requires state management

Failed refresh attempts can cascade if provider is unavailable — requires fallback strategy

What makes it unique

Implements token lifecycle management as a background process integrated with MCP client/server lifecycle, automatically refreshing credentials without application intervention

vs alternatives

More reliable than manual token refresh logic and prevents authentication failures due to expired tokens in long-running MCP applications

authentication error handling and challenge responses for mcp

Medium confidence

Provides standardized error handling for authentication failures in MCP, including invalid credentials, expired tokens, and missing authentication. Generates appropriate MCP error responses with actionable error messages and challenge directives (e.g., 'please re-authenticate'). Implements retry logic for transient auth failures and distinguishes between client errors (invalid credentials) and server errors (provider unavailable).

Solves for

I want to return clear error messages when MCP clients fail authenticationI need to tell clients to re-authenticate when their tokens expireI want to distinguish between invalid credentials and temporary provider failuresI need to implement retry logic for transient authentication errors

Best for

MCP servers providing good developer experience with clear auth error messages

Applications requiring robust error handling for authentication failures

Teams building MCP clients that need to handle auth errors gracefully

Requires

MCP server framework with error response support

Authentication provider error documentation

Client-side error handling logic

Limitations

Error message clarity depends on provider's error responses — some providers return vague errors

Retry logic can mask underlying auth configuration issues

No standardized MCP error format — error handling varies by MCP implementation

What makes it unique

Standardizes authentication error responses within MCP protocol, providing clients with actionable error information and challenge directives rather than generic HTTP-style error codes

vs alternatives

Better developer experience than generic error responses and enables clients to implement intelligent retry/re-auth logic

configuration management for authentication providers

Medium confidence

Centralizes configuration for multiple authentication providers (OAuth, OIDC, API keys, etc.) with support for environment variables, config files, and runtime updates. Validates provider configuration (client IDs, secrets, discovery URLs) and provides sensible defaults. Supports configuration inheritance and override patterns for different deployment environments (dev, staging, production).

Solves for

I want to configure multiple OAuth providers in my MCP server without hardcoding credentialsI need different auth configurations for dev, staging, and production environmentsI want to validate my auth configuration before starting the MCP serverI need to update auth configuration at runtime without restarting

Best for

Teams deploying MCP servers across multiple environments

Applications supporting multiple authentication providers

Developers managing secrets and credentials securely

Requires

Configuration source (environment variables, config file, or config service)

Provider-specific configuration parameters (client ID, client secret, discovery URL, etc.)

Secrets management solution for storing sensitive credentials

Limitations

Configuration validation is provider-specific — no universal validation schema

Runtime configuration updates require careful synchronization to avoid auth failures

Environment variable naming conventions vary; no standardized config key format

What makes it unique

Provides provider-agnostic configuration management that works across OAuth, OIDC, API keys, and custom auth methods, with environment-specific overrides and validation

vs alternatives

Simpler than managing provider configuration manually in each MCP server and more flexible than hardcoded provider lists

Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.

Related Artifactssharing capabilities

Artifacts that share capabilities with mcp-auth, ranked by overlap. Discovered automatically through the match graph.

MCP Server25

mcp-auth

Plug and play auth for Model Context Protocol (MCP) servers

oauth 2.0 / openid connect server integration for mcpmulti-provider identity federation for mcp clients

2 shared capabilities

MCP Server44

mcp-remote

Remote proxy for Model Context Protocol, allowing local-only clients to connect to remote servers using oAuth

oauth-authenticated remote mcp server proxyingtransparent client authentication abstraction

2 shared capabilities

MCP Server37

typescript-sdk

The official TypeScript SDK for Model Context Protocol servers and clients

oauth 2.0 authentication flow with provider-specific implementations

1 shared capability

MCP Server46

Neon MCP Server

Manage Neon serverless Postgres databases and branches via MCP.

oauth 2.0 authentication server for remote mcp clients

1 shared capability

MCP Server37

modelcontextprotocol

Specification and documentation for the Model Context Protocol

oauth 2.1 authorization framework with token management and validation

1 shared capability

MCP Server23

FastMCP

** (TypeScript)

authentication and authorization with oauth discovery

1 shared capability

Best For

✓Teams deploying MCP servers in enterprise environments with existing identity infrastructure
✓Developers building multi-tenant MCP applications requiring user isolation
✓Organizations migrating from REST APIs to MCP and needing to preserve OAuth authentication
✓Developers building MCP servers who want authentication without architectural changes
✓Teams prototyping authenticated MCP applications quickly
✓Solo developers managing multiple MCP servers with consistent auth policies
✓Multi-tenant MCP applications serving users from different organizations
✓Teams building MCP clients that need to work across enterprise and consumer identity providers

Known Limitations

⚠Requires pre-configured OAuth application credentials from identity provider
⚠Token refresh logic depends on provider's token expiration policies — no universal refresh strategy
⚠PKCE support and implicit flow handling varies by provider integration
⚠No built-in token revocation — relies on provider's revocation endpoints
⚠Middleware composition order matters — incorrect ordering can bypass auth checks
⚠No built-in rate limiting or brute-force protection — requires additional middleware

Requirements

Node.js 16+ or compatible JavaScript runtimeOAuth 2.0 / OIDC provider with application credentials (client ID, client secret)MCP server framework (e.g., @modelcontextprotocol/sdk)Network access to identity provider's authorization and token endpointsMCP server framework with middleware/handler supportNode.js 16+Authentication provider or credential store (OAuth provider, API key database, etc.)Configuration for each supported identity provider (client ID, discovery URL, etc.)

Input / Output

Accepts: OAuth authorization code (from redirect), Access token (JWT or opaque), Refresh token (if supported by provider), OIDC discovery endpoint URL, MCP request object with headers/metadata, Credential data (token, API key, etc.), Authentication policy configuration (JSON/YAML), Provider identifier (e.g., 'auth0', 'google', 'okta'), Provider-specific token or authorization code, Provider configuration (discovery URL, client credentials), JWT token string, Expected issuer URL, Expected audience claim, Public key or OIDC discovery URL, API key string (from MCP request header or metadata), Key scope/permissions configuration, Key expiration policy, Refresh token from OAuth provider, Token expiration timestamp, Refresh policy configuration (proactive vs reactive), Authentication failure reason (invalid token, expired, missing, etc.), Provider error response, Request context (which tool/resource failed auth), Configuration object or file (JSON, YAML, environment variables), Provider type identifier, Environment name (dev, staging, production)

Produces: Validated user identity object, Access token with expiration metadata, User claims (email, name, roles from OIDC), Authorization decision (allow/deny), Authenticated request context with user identity, Authorization decision (allow/deny/challenge), Error response if authentication fails, Normalized user identity object with standard claims (sub, email, name), Provider-agnostic access token, User metadata for authorization decisions, Decoded JWT payload with claims, Validation result (valid/invalid with reason), Extracted user identity and metadata, Validation result (valid/invalid), Associated client identity and scopes, Key metadata (creation date, last used, expiration), New access token, Updated refresh token (if provider rotates), New expiration timestamp, Refresh event notifications, MCP error response with error code and message, Challenge directive (if applicable), Retry guidance (if transient error), Logging/monitoring data for auth failures, Validated provider configuration object, Configuration validation errors (if invalid), Merged configuration with environment-specific overrides

UnfragileRank

Adoption55%(30% weight)

Quality17%(25% weight)

Ecosystem58%(25% weight)

Match Graph10%(15% weight)

Freshness75%(5% weight)

UnfragileRank is computed from adoption signals, documentation quality, ecosystem connectivity, match graph feedback, and freshness. No artifact can pay for a higher rank.

Type: MCP Server

8 capabilities

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Repository Details

Package Details

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0.2.0

Version

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Plug and play auth for Model Context Protocol (MCP) servers

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Capabilities8 decomposed

oauth 2.0 / openid connect server integration for mcp

Medium confidence

Solves for

Best for

Teams deploying MCP servers in enterprise environments with existing identity infrastructure

Developers building multi-tenant MCP applications requiring user isolation

Organizations migrating from REST APIs to MCP and needing to preserve OAuth authentication

Requires

Node.js 16+ or compatible JavaScript runtime

OAuth 2.0 / OIDC provider with application credentials (client ID, client secret)

MCP server framework (e.g., @modelcontextprotocol/sdk)

Limitations

Requires pre-configured OAuth application credentials from identity provider

Token refresh logic depends on provider's token expiration policies — no universal refresh strategy

PKCE support and implicit flow handling varies by provider integration

What makes it unique

vs alternatives

Simpler than implementing OAuth manually in MCP servers and more MCP-native than adapting generic OAuth libraries designed for HTTP REST APIs

plug-and-play authentication middleware for mcp servers

Medium confidence

Solves for

Best for

Developers building MCP servers who want authentication without architectural changes

Teams prototyping authenticated MCP applications quickly

Solo developers managing multiple MCP servers with consistent auth policies

Requires

MCP server framework with middleware/handler support

Node.js 16+

Authentication provider or credential store (OAuth provider, API key database, etc.)

Limitations

Middleware composition order matters — incorrect ordering can bypass auth checks

No built-in rate limiting or brute-force protection — requires additional middleware

Credential caching strategy is application-dependent; no universal caching layer

What makes it unique

vs alternatives

Faster to implement than custom auth logic in each MCP tool and more flexible than monolithic authentication layers that apply uniformly to all server capabilities

multi-provider identity federation for mcp clients

Medium confidence

Solves for

Best for

Multi-tenant MCP applications serving users from different organizations

Teams building MCP clients that need to work across enterprise and consumer identity providers

Developers migrating from one identity provider to another

Requires

Configuration for each supported identity provider (client ID, discovery URL, etc.)

Network access to all configured identity providers

MCP client framework with authentication hook support

Limitations

Provider-specific claims (roles, groups, permissions) may not map cleanly across providers

Token formats vary (JWT vs opaque) — requires provider-specific validation logic

No automatic provider discovery — requires explicit configuration for each provider

What makes it unique

Implements identity federation at the MCP protocol level, normalizing user identity across providers before MCP requests are processed, rather than handling federation at the HTTP/transport layer

vs alternatives

Simpler than building provider-specific auth logic in each MCP client and more flexible than single-provider OAuth libraries

jwt token validation and claims extraction for mcp

Medium confidence

Solves for

Best for

MCP servers using JWT-based authentication with external identity providers

Teams implementing fine-grained authorization based on JWT claims

Applications requiring cryptographic token validation

Requires

JWT token in MCP request (typically in Authorization header or metadata)

Access to identity provider's public keys or OIDC discovery endpoint

JWT validation library (e.g., jsonwebtoken, jose)

Limitations

Requires access to provider's public keys (via OIDC discovery or manual configuration)

No built-in token caching — each validation requires signature verification

Clock skew between client and server can cause valid tokens to be rejected

What makes it unique

Integrates JWT validation directly into MCP request processing pipeline, allowing per-request token validation without external HTTP calls, and supports OIDC key rotation for automatic key management

vs alternatives

More efficient than calling external token validation endpoints for every MCP request and more secure than trusting unvalidated tokens

api key authentication and validation for mcp

Medium confidence

Solves for

Best for

MCP servers supporting service-to-service authentication

Teams building internal MCP tools that don't need full OAuth complexity

Applications requiring simple, fast API key validation

Requires

Persistent key storage (database, file system, or key management service)

Key generation mechanism (cryptographically secure random string generation)

MCP server with request metadata access

Limitations

API keys are static credentials — no automatic refresh like OAuth tokens

Key rotation requires manual client updates

No built-in key expiration enforcement — requires application logic

What makes it unique

Provides lightweight API key validation without external provider dependencies, enabling offline MCP authentication and supporting key scoping at the MCP capability level

vs alternatives

Faster and simpler than OAuth for internal service-to-service MCP communication and doesn't require external identity provider availability

credential refresh and token lifecycle management for mcp

Medium confidence

Solves for

Best for

Long-running MCP client applications that need persistent authentication

MCP servers managing credentials for downstream service calls

Teams requiring automatic credential rotation for security compliance

Requires

OAuth provider supporting refresh tokens

Persistent state storage for refresh tokens (secure, encrypted)

Timer/scheduler for proactive token refresh

Limitations

Refresh token availability depends on OAuth provider — not all providers support refresh tokens

Refresh token rotation (provider-issued new refresh tokens) requires state management

Failed refresh attempts can cascade if provider is unavailable — requires fallback strategy

What makes it unique

Implements token lifecycle management as a background process integrated with MCP client/server lifecycle, automatically refreshing credentials without application intervention

vs alternatives

More reliable than manual token refresh logic and prevents authentication failures due to expired tokens in long-running MCP applications

authentication error handling and challenge responses for mcp

Medium confidence

Solves for

Best for

MCP servers providing good developer experience with clear auth error messages

Applications requiring robust error handling for authentication failures

Teams building MCP clients that need to handle auth errors gracefully

Requires

MCP server framework with error response support

Authentication provider error documentation

Client-side error handling logic

Limitations

Error message clarity depends on provider's error responses — some providers return vague errors

Retry logic can mask underlying auth configuration issues

No standardized MCP error format — error handling varies by MCP implementation

What makes it unique

Standardizes authentication error responses within MCP protocol, providing clients with actionable error information and challenge directives rather than generic HTTP-style error codes

vs alternatives

Better developer experience than generic error responses and enables clients to implement intelligent retry/re-auth logic

configuration management for authentication providers

Medium confidence

Solves for

Best for

Teams deploying MCP servers across multiple environments

Applications supporting multiple authentication providers

Developers managing secrets and credentials securely

Requires

Configuration source (environment variables, config file, or config service)

Provider-specific configuration parameters (client ID, client secret, discovery URL, etc.)

Secrets management solution for storing sensitive credentials

Limitations

Configuration validation is provider-specific — no universal validation schema

Runtime configuration updates require careful synchronization to avoid auth failures

Environment variable naming conventions vary; no standardized config key format

What makes it unique

Provides provider-agnostic configuration management that works across OAuth, OIDC, API keys, and custom auth methods, with environment-specific overrides and validation

vs alternatives

Simpler than managing provider configuration manually in each MCP server and more flexible than hardcoded provider lists

Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.

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mcp-auth

Capabilities8 decomposed

oauth 2.0 / openid connect server integration for mcp

plug-and-play authentication middleware for mcp servers

multi-provider identity federation for mcp clients

jwt token validation and claims extraction for mcp

api key authentication and validation for mcp

credential refresh and token lifecycle management for mcp

authentication error handling and challenge responses for mcp

configuration management for authentication providers

Related Artifactssharing capabilities

mcp-auth

mcp-remote

typescript-sdk

Neon MCP Server

modelcontextprotocol

FastMCP

Best For

Known Limitations

Requirements

Input / Output

UnfragileRank

Repository Details

Package Details

About

Categories

Alternatives to mcp-auth

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mcp-auth

Capabilities8 decomposed

oauth 2.0 / openid connect server integration for mcp

plug-and-play authentication middleware for mcp servers

multi-provider identity federation for mcp clients

jwt token validation and claims extraction for mcp

api key authentication and validation for mcp

credential refresh and token lifecycle management for mcp

authentication error handling and challenge responses for mcp

configuration management for authentication providers

Related Artifactssharing capabilities

mcp-auth

mcp-remote

typescript-sdk

Neon MCP Server

modelcontextprotocol

FastMCP

Best For

Known Limitations

Requirements

Input / Output

UnfragileRank

Repository Details

Package Details

About

Categories

Alternatives to mcp-auth

Are you the builder of mcp-auth?

Get the weekly brief

Data Sources