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3.3k followers · 60 following

Achievements

Achievement: Pair Extraordinairex2Achievement: Galaxy BrainAchievement: QuickdrawAchievement: YOLOAchievement: Arctic Code Vault ContributorAchievement: Starstruckx4Achievement: Pull Sharkx4

Achievements

Achievement: Pair Extraordinairex2Achievement: Galaxy BrainAchievement: QuickdrawAchievement: YOLOAchievement: Arctic Code Vault ContributorAchievement: Starstruckx4Achievement: Pull Sharkx4

Organizations

@bitswift @ReactiveCocoa @Squirrel @antitypical @Mantle @Carthage @ArbiterLib @bankroll-py @antequant @modelcontextprotocol

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jspahrsummers/README.md

About me

Hi, I'm Justin! 👋

I'm very excited and very worried about the potential of AI, which is why I work at Anthropic PBC. I'm currently part of the team developing and maintaining the Model Context Protocol. Note that my opinions don't reflect those of my employer.

Previously, I worked at various other companies—notably Meta and GitHub—and have done some independent consulting as well.

In a past life, I contributed significantly to some open source projects in the iOS and macOS ecosystem:

  • ReactiveCocoa: reactive programming in Swift and Objective-C
  • Mantle: a model framework for Cocoa
  • Squirrel: robust software update framework for Mac apps
  • Carthage: a decentralized dependency manager

You can contact me via any of the social links to the left.

Pinned Loading

  1. modelcontextprotocol/servers Public

    Model Context Protocol Servers

    JavaScript 27.8k 2.9k

  2. modelcontextprotocol/specification Public

    The specification of the Model Context Protocol

    TypeScript 1.2k 141

  3. modelcontextprotocol/python-sdk Public

    The official Python SDK for Model Context Protocol servers and clients

    Python 6.5k 618

  4. modelcontextprotocol/typescript-sdk Public

    The official Typescript SDK for Model Context Protocol servers and clients

    TypeScript 3.7k 385

  5. ReactiveCocoa/ReactiveCocoa Public

    Cocoa framework and Obj-C dynamism bindings for ReactiveSwift.

    Swift 19.9k 3.5k

  6. Carthage/Carthage Public

    A simple, decentralized dependency manager for Cocoa

    Swift 15k 1.6k

2,842 contributions in the last year

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Contribution activity

March 2025

Created 60 commits in 4 repositories

Created a pull request in modelcontextprotocol/specification that received 194 comments

[RFC] Replace HTTP+SSE with new "Streamable HTTP" transport

This PR introduces the Streamable HTTP transport for MCP, addressing key limitations of the current HTTP+SSE transport while maintaining its advant…

+203 −29 lines changed • 194 comments
Opened 7 other pull requests in 2 repositories
Reviewed 17 pull requests in 6 repositories
Opened 4 issues in 2 repositories
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