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https://github.com/ruby-oauth/oauth2-mcp

🔮 Rack/Roda-compatible resource-server toolkit for Oauth2.1 MCP Auth
https://github.com/ruby-oauth/oauth2-mcp

mcp mcp-client mcp-server oauth2 rubygem

Last synced: 17 days ago
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🔮 Rack/Roda-compatible resource-server toolkit for Oauth2.1 MCP Auth

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[🖼️oauth]: https://github.com/ruby-oauth



# 🔮 OAuth2::MCP



[![Version][👽versioni]][👽version] [![GitHub tag (latest SemVer)][⛳️tag-img]][⛳️tag] [![License: MIT][📄license-img]][📄license] [![Downloads Rank][👽dl-ranki]][👽dl-rank] [![CodeCov Test Coverage][🏀codecovi]][🏀codecov] [![Coveralls Test Coverage][🏀coveralls-img]][🏀coveralls] [![QLTY Test Coverage][🏀qlty-covi]][🏀qlty-cov] [![QLTY Maintainability][🏀qlty-mnti]][🏀qlty-mnt] [![CI Heads][🚎3-hd-wfi]][🚎3-hd-wf] [![CI Runtime Dependencies @ HEAD][🚎12-crh-wfi]][🚎12-crh-wf] [![CI Current][🚎11-c-wfi]][🚎11-c-wf] [![CI Truffle Ruby][🚎9-t-wfi]][🚎9-t-wf] [![CI JRuby][🚎10-j-wfi]][🚎10-j-wf] [![Deps Locked][🚎13-🔒️-wfi]][🚎13-🔒️-wf] [![Deps Unlocked][🚎14-🔓️-wfi]][🚎14-🔓️-wf] [![CI Test Coverage][🚎2-cov-wfi]][🚎2-cov-wf] [![CI Style][🚎5-st-wfi]][🚎5-st-wf] [![Apache SkyWalking Eyes License Compatibility Check][🚎15-🪪-wfi]][🚎15-🪪-wf]



`if ci_badges.map(&:color).detect { it != "green"}` ☝️ [let me know][🖼️galtzo-floss], as I may have missed the [discord notification][🖼️galtzo-floss].



---



`if ci_badges.map(&:color).all? { it == "green"}` 👇️ send money so I can do more of this. FLOSS maintenance is now my full-time job.



[![Sponsor Me on Github][🖇sponsor-img]][🖇sponsor] [![Liberapay Goal Progress][⛳liberapay-img]][⛳liberapay] [![Donate on PayPal][🖇paypal-img]][🖇paypal] [![Buy me a coffee][🖇buyme-small-img]][🖇buyme] [![Donate on Polar][🖇polar-img]][🖇polar] [![Donate at ko-fi.com][🖇kofi-img]][🖇kofi]



 👣 How will this project approach the September 2025 hostile takeover of RubyGems? 🚑️



I've summarized my thoughts in [this blog post](https://dev.to/galtzo/hostile-takeover-of-rubygems-my-thoughts-5hlo).



## 🌻 Synopsis



`oauth2-mcp` is a Ruby resource-server toolkit for securing HTTP Model Context

Protocol servers with OAuth 2.1-style bearer authorization.



It builds on the `oauth2` gem for the Ruby OAuth/OIDC substrate and adds the MCP

resource-server pieces that generic OAuth clients do not provide.



The gem is intentionally focused on the MCP server side:



- protected-resource metadata for MCP endpoint discovery;

- `WWW-Authenticate` bearer challenges;

- scope and capability mapping for application policy layers;

- provider adapters for WorkOS/AuthKit and generic OIDC/JWKS validation;

- explicit audience/resource validation so tokens cannot be replayed against

  another MCP server.



Token passthrough is not a supported pattern. MCP servers should validate the

incoming token for their own resource and issue separate downstream credentials

when calling other services. Successful authorization results expose normalized

claims and mapped capabilities, not the raw bearer token.



## 💡 Info you can shake a stick at



| Tokens to Remember | [![Gem name][⛳️name-img]][⛳️gem-name] [![Gem namespace][⛳️namespace-img]][⛳️gem-namespace] |

|-------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| Works with JRuby | [![JRuby current Compat][💎jruby-c-i]][🚎10-j-wf] [![JRuby HEAD Compat][💎jruby-headi]][🚎3-hd-wf]|

| Works with Truffle Ruby | [![Truffle Ruby 24.2 Compat][💎truby-24.2i]][🚎truby-24.2-wf] [![Truffle Ruby 25.0 Compat][💎truby-25.0i]][🚎truby-25.0-wf] [![Truffle Ruby current Compat][💎truby-c-i]][🚎9-t-wf]|

| Works with MRI Ruby 4 | [![Ruby 4.0 Compat][💎ruby-4.0i]][🚎11-c-wf] [![Ruby current Compat][💎ruby-c-i]][🚎11-c-wf] [![Ruby HEAD Compat][💎ruby-headi]][🚎3-hd-wf]|

| Works with MRI Ruby 3 | [![Ruby 3.2 Compat][💎ruby-3.2i]][🚎ruby-3.2-wf] [![Ruby 3.3 Compat][💎ruby-3.3i]][🚎ruby-3.3-wf] [![Ruby 3.4 Compat][💎ruby-3.4i]][🚎ruby-3.4-wf]|

| Support & Community | [![Join Me on Daily.dev's RubyFriends][✉️ruby-friends-img]][✉️ruby-friends] [![Live Chat on Discord][✉️discord-invite-img-ftb]][✉️discord-invite] [![Get help from me on Upwork][👨🏼‍🏫expsup-upwork-img]][👨🏼‍🏫expsup-upwork] [![Get help from me on Codementor][👨🏼‍🏫expsup-codementor-img]][👨🏼‍🏫expsup-codementor] |

| Source | [![Source on GitLab.com][📜src-gl-img]][📜src-gl] [![Source on CodeBerg.org][📜src-cb-img]][📜src-cb] [![Source on Github.com][📜src-gh-img]][📜src-gh] [![The best SHA: dQw4w9WgXcQ!][🧮kloc-img]][🧮kloc] |

| Documentation | [![Current release on RubyDoc.info][📜docs-cr-rd-img]][🚎yard-current] [![YARD on Galtzo.com][📜docs-head-rd-img]][🚎yard-head] [![Maintainer Blog][🚂maint-blog-img]][🚂maint-blog] [![GitLab Wiki][📜gl-wiki-img]][📜gl-wiki] [![GitHub Wiki][📜gh-wiki-img]][📜gh-wiki] |

| Compliance | [![License: MIT][📄license-img]][📄license] [![Apache license compatibility: Category A][📄license-compat-img]][📄license-compat] [![📄ilo-declaration-img]][📄ilo-declaration] [![Security Policy][🔐security-img]][🔐security] [![Contributor Covenant 2.1][🪇conduct-img]][🪇conduct] [![SemVer 2.0.0][📌semver-img]][📌semver] |

| Style | [![Enforced Code Style Linter][💎rlts-img]][💎rlts] [![Keep-A-Changelog 1.0.0][📗keep-changelog-img]][📗keep-changelog] [![Gitmoji Commits][📌gitmoji-img]][📌gitmoji] [![Compatibility appraised by: appraisal2][💎appraisal2-img]][💎appraisal2] |

| Maintainer 🎖️ | [![Follow Me on LinkedIn][💖🖇linkedin-img]][💖🖇linkedin] [![Follow Me on Ruby.Social][💖🐘ruby-mast-img]][💖🐘ruby-mast] [![Follow Me on Bluesky][💖🦋bluesky-img]][💖🦋bluesky] [![Contact Maintainer][🚂maint-contact-img]][🚂maint-contact] [![My technical writing][💖💁🏼‍♂️devto-img]][💖💁🏼‍♂️devto] |

| `...` 💖 | [![Find Me on WellFound:][💖✌️wellfound-img]][💖✌️wellfound] [![Find Me on CrunchBase][💖💲crunchbase-img]][💖💲crunchbase] [![My LinkTree][💖🌳linktree-img]][💖🌳linktree] [![More About Me][💖💁🏼‍♂️aboutme-img]][💖💁🏼‍♂️aboutme] [🧊][💖🧊berg] [🐙][💖🐙hub] [🛖][💖🛖hut] [🧪][💖🧪lab] |



### Compatibility



Compatible with MRI Ruby 3.2.0+, and concordant releases of JRuby, and TruffleRuby.

CI workflows and Appraisals are generated for MRI Ruby 3.2.0+.

This test floor is configured by `ruby.test_minimum` in `.kettle-jem.yml` and

may be higher than the gem's runtime compatibility floor when legacy Rubies are

not practical for the current toolchain.



| 🚚 _Amazing_ test matrix was brought to you by | 🔎 appraisal2 🔎 and the color 💚 green 💚 |

|------------------------------------------------|--------------------------------------------------------|

| 👟 Check it out! | ✨ [github.com/appraisal-rb/appraisal2][💎appraisal2] ✨ |



### Federated DVCS



 Find this repo on federated forges (Coming soon!)



| Federated [DVCS][💎d-in-dvcs] Repository | Status | Issues | PRs | Wiki | CI | Discussions |

|-------------------------------------------------|-----------------------------------------------------------------------|---------------------------|--------------------------|---------------------------|--------------------------|------------------------------|

| 🧪 [ruby-oauth/oauth2-mcp on GitLab][📜src-gl] | The Truth | [💚][🤝gl-issues] | [💚][🤝gl-pulls] | [💚][📜gl-wiki] | 🐭 Tiny Matrix | ➖ |

| 🧊 [ruby-oauth/oauth2-mcp on CodeBerg][📜src-cb] | An Ethical Mirror ([Donate][🤝cb-donate]) | [💚][🤝cb-issues] | [💚][🤝cb-pulls] | ➖ | ⭕️ No Matrix | ➖ |

| 🐙 [ruby-oauth/oauth2-mcp on GitHub][📜src-gh] | Another Mirror | [💚][🤝gh-issues] | [💚][🤝gh-pulls] | [💚][📜gh-wiki] | 💯 Full Matrix | [💚][gh-discussions] |

| 🎮️ [Discord Server][✉️discord-invite] | [![Live Chat on Discord][✉️discord-invite-img-ftb]][✉️discord-invite] | [Let's][✉️discord-invite] | [talk][✉️discord-invite] | [about][✉️discord-invite] | [this][✉️discord-invite] | [library!][✉️discord-invite] |



[gh-discussions]: https://github.com/ruby-oauth/oauth2-mcp/discussions



### Enterprise Support [![Tidelift](https://tidelift.com/badges/package/rubygems/oauth2-mcp)](https://tidelift.com/subscription/pkg/rubygems-oauth2-mcp?utm_source=rubygems-oauth2-mcp&utm_medium=referral&utm_campaign=readme)



Available as part of the Tidelift Subscription.



 Need enterprise-level guarantees?



The maintainers of this and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source packages you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact packages you use.



[![Get help from me on Tidelift][🏙️entsup-tidelift-img]][🏙️entsup-tidelift]



- 💡Subscribe for support guarantees covering _all_ your FLOSS dependencies

- 💡Tidelift is part of [Sonar][🏙️entsup-tidelift-sonar]

- 💡Tidelift pays maintainers to maintain the software you depend on!
📊`@`Pointy Haired Boss: An [enterprise support][🏙️entsup-tidelift] subscription is "[never gonna let you down][🧮kloc]", and *supports* open source maintainers



Alternatively:



- [![Live Chat on Discord][✉️discord-invite-img-ftb]][✉️discord-invite]

- [![Get help from me on Upwork][👨🏼‍🏫expsup-upwork-img]][👨🏼‍🏫expsup-upwork]

- [![Get help from me on Codementor][👨🏼‍🏫expsup-codementor-img]][👨🏼‍🏫expsup-codementor]



## ✨ Installation



Install the gem and add to the application's Gemfile by executing:



```console

bundle add oauth2-mcp

```



If bundler is not being used to manage dependencies, install the gem by executing:



```console

gem install oauth2-mcp

```



## ⚙️ Configuration



`oauth2-mcp` does not use global configuration. Build the objects that match the

OAuth provider and MCP endpoint you are protecting, then pass those objects to a

resource server or Rack middleware.



The core resource metadata is the MCP resource URI, the authorization server

issuer(s), and the scopes your endpoint understands:



```ruby

metadata = OAuth2::MCP::ProtectedResourceMetadata.new(

  resource: "https://brain.example.com/mcp",

  authorization_servers: ["https://example.authkit.app"],

  scopes_supported: %w[memory.read memory.write],

)

```



Token validation is supplied by one of the validator adapters:



- `OAuth2::MCP::JWTValidator` for JWT bearer tokens when you already have JWKS.

- `OAuth2::MCP::OIDCDiscovery` when the authorization server exposes OIDC

  discovery and JWKS metadata.

- `OAuth2::MCP::WorkOSAuthKit` for WorkOS AuthKit resource-server JWTs.

- `OAuth2::MCP::IntrospectionValidator` for opaque tokens validated through an

  OAuth token introspection endpoint.



Map provider scopes to application capabilities with `ScopeMapper` when the MCP

server needs internal permission names:



```ruby

scope_mapper = OAuth2::MCP::ScopeMapper.new(

  mapping: {

    "memory.read" => "documents_read",

    "memory.write" => "documents_write",

  },

)

```



Finally, configure the resource server with the metadata URL you publish to

clients. That URL is emitted in `WWW-Authenticate` challenges so clients can

discover how to obtain an acceptable token.



```ruby

resource_server = OAuth2::MCP::ResourceServer.new(

  resource_metadata: metadata,

  resource_metadata_url: "https://brain.example.com/.well-known/oauth-protected-resource/mcp",

  validator: validator,

  scope_mapper: scope_mapper,

)

```



## 🔧 Basic Usage



Build protected-resource metadata for an MCP endpoint:



```ruby

metadata = OAuth2::MCP::ProtectedResourceMetadata.new(

  resource: "https://brain.example.com/mcp",

  authorization_servers: ["https://example.authkit.app"],

  scopes_supported: %w[memory.read memory.write],

)



metadata.to_json

```



Return a bearer challenge when authorization is missing or insufficient:



```ruby

challenge = OAuth2::MCP::BearerChallenge.new(

  resource_metadata: "https://brain.example.com/.well-known/oauth-protected-resource/mcp",

  scope: %w[memory.read],

  error: "insufficient_scope",

  error_description: "memory.read is required",

)



headers["WWW-Authenticate"] = challenge.to_header

```



Authorize an MCP HTTP request with a provider-specific token validator:



```ruby

metadata = OAuth2::MCP::ProtectedResourceMetadata.new(

  resource: "https://brain.example.com/mcp",

  authorization_servers: ["https://example.authkit.app"],

  scopes_supported: %w[memory.read memory.write],

)



validator = OAuth2::MCP::JWTValidator.new(

  jwks: {"keys" => provider_jwks},

  issuer: "https://example.authkit.app",

  audience: "https://brain.example.com/mcp",

)



scope_mapper = OAuth2::MCP::ScopeMapper.new(

  mapping: {

    "memory.read" => "documents_read",

    "memory.write" => "documents_write",

  },

)



resource_server = OAuth2::MCP::ResourceServer.new(

  resource_metadata: metadata,

  resource_metadata_url: "https://brain.example.com/.well-known/oauth-protected-resource/mcp",

  validator: validator,

  scope_mapper: scope_mapper,

)



result = resource_server.authorize(

  request: rack_env,

  scopes: ["memory.read"],

)



halt result.status, result.headers, "" unless result.allowed?

```



Protect a Rack-compatible MCP HTTP endpoint:



```ruby

use OAuth2::MCP::RackMiddleware,

  resource_server: resource_server,

  scopes: ["memory.read"]

```



Or build the validator from OIDC discovery:



```ruby

validator = OAuth2::MCP::OIDCDiscovery.new(

  issuer: "https://example.authkit.app",

).jwt_validator(

  audience: "https://brain.example.com/mcp",

)

```



For WorkOS AuthKit, use the provider adapter. It validates against the AuthKit

issuer and `/oauth2/jwks` endpoint:



```ruby

validator = OAuth2::MCP::WorkOSAuthKit.new(

  subdomain: "acme",

  audience: "https://brain.example.com/mcp",

)

```



For opaque access tokens, use OAuth token introspection with an `OAuth2::Client`

configured for the authorization server:



```ruby

validator = OAuth2::MCP::IntrospectionValidator.new(

  client: oauth_client,

  introspection_url: "https://auth.example.com/oauth2/introspection",

  audience: "https://brain.example.com/mcp",

  issuer: "https://auth.example.com",

)

```



## 🦷 FLOSS Funding



While ruby-oauth tools are free software and will always be, the project would benefit immensely from some funding.

Raising a monthly budget of... "dollars" would make the project more sustainable.



We welcome both individual and corporate sponsors! We also offer a

wide array of funding channels to account for your preferences.

Currently, [GitHub Sponsors][🖇sponsor], and [Liberapay][⛳liberapay] are our preferred funding platforms.



**If you're working in a company that's making significant use of ruby-oauth tools we'd

appreciate it if you suggest to your company to become a ruby-oauth sponsor.**



You can support the development of ruby-oauth tools via

[GitHub Sponsors][🖇sponsor],

[Liberapay][⛳liberapay],

[PayPal][🖇paypal],

and [Tidelift][🏙️entsup-tidelift].



| 📍 NOTE |

|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| If doing a sponsorship in the form of donation is problematic for your company 
 from an accounting standpoint, we'd recommend the use of Tidelift, 
 where you can get a support-like subscription instead. |



### Another way to support open-source



I’m driven by a passion to foster a thriving open-source community – a space where people can tackle complex problems, no matter how small. Revitalizing libraries that have fallen into disrepair, and building new libraries focused on solving real-world challenges, are my passions. I was recently affected by layoffs, and the tech jobs market is unwelcoming. I’m reaching out here because your support would significantly aid my efforts to provide for my family, and my farm (11 🐔 chickens, 2 🐶 dogs, 3 🐰 rabbits, 8 🐈‍ cats).



If you work at a company that uses my work, please encourage them to support me as a corporate sponsor. My work on gems you use might show up in `bundle fund`.



I’m developing a new library, [floss_funding][🖇floss-funding-gem], designed to empower open-source developers like myself to get paid for the work we do, in a sustainable way. Please give it a look.



**[Floss-Funding.dev][🖇floss-funding.dev]: 👉️ No network calls. 👉️ No tracking. 👉️ No oversight. 👉️ Minimal crypto hashing. 💡 Easily disabled nags**



 [![Sponsor Me on Github][🖇sponsor-img]][🖇sponsor] [![Liberapay Goal Progress][⛳liberapay-img]][⛳liberapay] [![Donate on PayPal][🖇paypal-img]][🖇paypal] [![Buy me a coffee][🖇buyme-small-img]][🖇buyme] [![Donate on Polar][🖇polar-img]][🖇polar] [![Donate to my FLOSS efforts at ko-fi.com][🖇kofi-img]][🖇kofi] [![Donate to my FLOSS efforts using Patreon][🖇patreon-img]][🖇patreon]



## 🔐 Security



See [SECURITY.md][🔐security].



## 🤝 Contributing



If you need some ideas of where to help, you could work on adding more code coverage,

or if it is already 💯 (see [below](#code-coverage)) check [issues][🤝gh-issues] or [PRs][🤝gh-pulls],

or use the gem and think about how it could be better.



We [![Keep A Changelog][📗keep-changelog-img]][📗keep-changelog] so if you make changes, remember to update it.



See [CONTRIBUTING.md][🤝contributing] for more detailed instructions.



### 🚀 Release Instructions



See [CONTRIBUTING.md][🤝contributing].



### Code Coverage



Coverage service badges



[![Coverage Graph][🏀codecov-g]][🏀codecov]



[![Coveralls Test Coverage][🏀coveralls-img]][🏀coveralls]



[![QLTY Test Coverage][🏀qlty-covi]][🏀qlty-cov]



### 🪇 Code of Conduct



Everyone interacting with this project's codebases, issue trackers,

chat rooms and mailing lists agrees to follow the [![Contributor Covenant 2.1][🪇conduct-img]][🪇conduct].



## 🌈 Contributors



[![Contributors][🖐contributors-img]][🖐contributors]



Made with [contributors-img][🖐contrib-rocks].



Also see GitLab Contributors: [https://gitlab.com/ruby-oauth/oauth2-mcp/-/graphs/main][🚎contributors-gl]



 ⭐️ Star History





 

 

 

 Star History Chart

 




## 📌 Versioning



This library follows [![Semantic Versioning 2.0.0][📌semver-img]][📌semver] for its public API where practical.

For most applications, prefer the [Pessimistic Version Constraint][📌pvc] with two digits of precision.



For example:



```ruby

spec.add_dependency("oauth2-mcp", "~> 0.0")

```



📌 Is "Platform Support" part of the public API? More details inside.



Dropping support for a platform can be a breaking change for affected users.

If a release changes supported platforms, it should be called out clearly in the changelog and versioned with that impact in mind.



To get a better understanding of how SemVer is intended to work over a project's lifetime,

read this article from the creator of SemVer:



- ["Major Version Numbers are Not Sacred"][📌major-versions-not-sacred]



See [CHANGELOG.md][📌changelog] for a list of releases.



## 📄 License



The gem is available as open source under the terms of

the [MIT](MIT.md) [![License: MIT][📄license-img]][📄license-ref].



### © Copyright



See [LICENSE.md][📄license] for the official copyright notice.



Copyright holders



- Copyright (c) 2026 Peter H. Boling



## 🤑 A request for help



Maintainers have teeth and need to pay their dentists.

After getting laid off in an RIF in March, and encountering difficulty finding a new one,

I began spending most of my time building open source tools.

I'm hoping to be able to pay for my kids' health insurance this month,

so if you value the work I am doing, I need your support.

Please consider sponsoring me or the project.



To join the community or get help 👇️ Join the Discord.



[![Live Chat on Discord][✉️discord-invite-img-ftb]][✉️discord-invite]



To say "thanks!" ☝️ Join the Discord or 👇️ send money.



[![Sponsor me on GitHub Sponsors][🖇sponsor-bottom-img]][🖇sponsor] 💌 [![Sponsor me on Liberapay][⛳liberapay-bottom-img]][⛳liberapay] 💌 [![Donate on PayPal][🖇paypal-bottom-img]][🖇paypal]



### Please give the project a star ⭐ ♥.



Thanks for RTFM. ☺️



[⛳liberapay-img]: https://img.shields.io/liberapay/goal/pboling.svg?logo=liberapay&color=a51611&style=flat

[⛳liberapay-bottom-img]: https://img.shields.io/liberapay/goal/pboling.svg?style=for-the-badge&logo=liberapay&color=a51611

[⛳liberapay]: https://liberapay.com/pboling/donate

[🖇sponsor-img]: https://img.shields.io/badge/Sponsor_Me!-pboling.svg?style=social&logo=github

[🖇sponsor-bottom-img]: https://img.shields.io/badge/Sponsor_Me!-pboling-blue?style=for-the-badge&logo=github

[🖇sponsor]: https://github.com/sponsors/pboling

[🖇polar-img]: https://img.shields.io/badge/polar-donate-a51611.svg?style=flat

[🖇polar]: https://polar.sh/pboling

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| Field | Value |

|---|---|

| Package | oauth2-mcp |

| Description | 🔮 oauth2-mcp provides Ruby helpers for securing HTTP Model Context Protocol servers with OAuth protected-resource metadata, bearer challenges, and scoped authorization. |

| Homepage | https://github.com/ruby-oauth/oauth2-mcp |

| Source | https://github.com/ruby-oauth/oauth2-mcp/tree/v0.1.0 |

| License | `MIT` |

| Funding | https://github.com/sponsors/pboling, https://issuehunt.io/u/pboling, https://ko-fi.com/pboling, https://liberapay.com/pboling/donate, https://patreon.com/galtzo, https://polar.sh/pboling, https://thanks.dev/u/gh/pboling, https://tidelift.com/funding/github/rubygems/oauth2-mcp, https://www.buymeacoffee.com/pboling |