The latest edition of Block Open Sourcery is here! In this month's newsletter, we cover: 🔧 Square MCP server launch 🌏 First international Goose meetup ✨ Monthly Contributor Spotlight and more!

Goose Goes Global

From the first Goose meetup in NYC to the upcoming hack night in Sydney, the open source community experiences are landing across the globe! Thrill...

The only source of truth should be the actual docs. Goose + Context7 pulls live, versioned docs to help you: ✅ Compare frameworks ✅ Follow best practices ✅ Scaffold apps with real implementation patterns Removing all the guess work and your LLMs hallucinations.

Join us on stage at SXSW London! Learn how SaaS companies can harness AI to drive growth, stay competitive and deliver smarter solutions with Manik Surtani (Block), Eleanor Lightbody (Luminance), Matt Weaver (OpenAI), and moderator Marine Boulot (The Metaverse Society) Live at 11:35am on June 5th, #SXSWLondon

🔐 "Got your keys, got your coins" - but what happens when those keys aren't as secure as you think? Our latest engineering deep-dive explores Bitcoin wallet security vulnerabilities and the importance of robust cold storage approaches. Essential reading for anyone serious about crypto security.

Block Engineering Blog

Got your keys, got your coins: how to backdoor a bitcoin wallet

Inside a Bitcoin wallet backdoor: covertly leaking seeds through bitcoin signatures.

Code changes move fast. Docs fall behind. What if your AI agent wrote and updated them for you? Join us Friday to see how Crystal Ji built a workflow with Goose that auto-generates docs all triggered by a PR. 📆 June 6 @ 9am PT / 12pm ET 📺 https://linktr.ee/blockopensource

Your AI agent just got a voice. And yeah, it might be yours Goose + ElevenLabs = - Voice cloning - Audio editing - Speech transcription All from one single prompt.

We’re excited to announce that Block has officially joined the Kotlin Foundation! 🎉 This milestone highlights a special, shared history between our engineering teams and the Kotlin community. Read more on the blog:

Block Joins the Kotlin Foundation

Block Joins the Kotlin Foundation

Block joins the Kotlin Foundation to support Kotlin’s growth and innovation, deepening its long-standing commitment to the language and open source.

The third edition of Block Open Sourcery is here! ✨ Let's celebrate the latest milestones, recap goose hack nights IRL, and spotlighting community members together. Subscribe to get each edition directly in your inbox. ❤️

Building Bridges

The energy was infectious at #AIAgentHackNight with MCP in Atlanta, and the goose tour doesn’t stop there. Explore new open source bridges being ...

Goose's MCP hack night in SF is sold out!🪿 Check out our schedule of upcoming events and latest updates this week: - SF #AIAgentHacknight with MCP is full, but you can join the waitlist!

SF AI Agent HackNight with MCP ft. Codename Goose & Anthropic, Cloudflare, Stytch, and Supabase · Luma

MCP is rapidly changing the landscape of what's possible for developer tools while broadly, AI is changing the way we work. Let's explore this toge...

- The first Monthly Contributor spotlight is coming out this week. Join the Block Open Source Discord to see who:

Discord

Join the Block Open Source Discord Server!

Check out the Block Open Source community on Discord - hang out with 124 other members and enjoy free voice and text chat.

- Wild Goose Case livestream is back this week, and this time...goose takes us scuba diving? Subscribe to the events calendar to keep up ➡️

goose - CalGet

Wanna to make an MCP server for your API but you have a gazillion endpoints?! Check out this layering approach used to create the Square MCP. With only 3 MCP tools, we expose 30+ APIs and 200+ endpoints! 🤯

Block Engineering Blog

Build MCP Tools Like Ogres... With Layers

Avoid monolithic AI tools. Learn a layered MCP pattern that helps LLMs navigate complex APIs with better accuracy, debuggability, and structure.

🚀 Make your Square business work smarter Let Goose handle your Square seller tasks - from one-time tasks like data imports, to daily inventory updates or weekly reports. Safe & secure. Learn more and get started today! https://block.github.io/goose/docs/tutorials/square-mcp

Goose is coming to San Francisco with an MCP hack night!🪿 Our schedule of events for May so far (more in the replies) 👇

Next stop: San Francisco 🛣️✨ We’re bringing the AI Agent + MCP meetup roadshow to the Bay! Catch talks and live demos from our very own Angie Jones, as well as speakers from Anthropic, Cloudflare, Supabase, and Stytch! Space is limited so RSVP now to grab your spot!

SF AI Agent HackNight with MCP ft. Codename Goose & Anthropic, Cloudflare, Stytch, and Supabase · Luma

MCP is rapidly changing the landscape of what's possible for developer tools while broadly, AI is changing the way we work. Let's explore this toge...

#AIAgentHackNight with MCP in Atlanta is this week. Check out the final events of the month in our full schedule below! RSVP to Atlanta:

AI Agent HackNight with MCP: Atlanta · Luma

MCP is rapidly changing the landscape of what's possible for developer tools while broadly, AI is changing the way we work. Let's explore this toge...

RSVP to Pieces AI Productivity Summit:

Pieces AI Productivity Summit · Luma

Designed for AI leaders, developers, designers, and enthusiasts, this event features expert talks, interactive demos, and insightful panels explori...

Add our open source events calendar:

goose - CalGet

Join us on Discord:

Discord

Join the Block Open Source Discord Server!

Check out the Block Open Source community on Discord - hang out with 124 other members and enjoy free voice and text chat.

We have a new top contributor ... Huge congrats to BestCodes 🎊 !! He's had a domino effect in the community, inspiring others to share their contribution no matter how "small" they may seem. He also constantly makes an effort to improve the goose experience. 🪿 Thank you so much for your continued support! Your work make goose better and better. ❤️ As a token of our gratitude, you'll receive exclusive codename goose swag! ✨ Links to their contribution in the replies . 👇

Goose just got social 😎 What if your AI agent could scroll your feed, summarize hot topics, and draft the perfect response post? We're going to chat with Brian Ellin who made a great MCP server to communicate over ATproto to retrieve timeline feeds and even post a message that sounds like it came from you! Join us Friday April 25 at 10am PT, 1pm ET -- we're gonna have Goose post something unhinged, too! https://linktr.ee/blockopensource

MCP isn’t a pilot at Block. It’s the standard. From engineers to finance, we’re using it company-wide.

MCP in the Enterprise: Real World Adoption at Block

How Block is using MCP to power real world automation company-wide.

✨ Coming Up: Apr 21 - May 1 ✨ The Great Goose Off, Databricks x Anthropic virtual event, Pieces AI Productivity Summit and more. Here's a preview of events closing out the month~

'Hey, what's in this 80-page PDF?' 'Let me read that for you in 2 seconds' 🤓 Skip the endless scrolling. Goose turns PDFs into conversations - ask questions, get instant answers. No more CTRL+F treasure hunts. Just chat with your documents. Full Tutorial: https://block.github.io/goose/docs/tutorials/pdf-mcp

Whitepapers are great, but sometimes you just need a visual. This guide breaks down the entire MCP ecosystem: what it is, who’s involved, and how it all works.

A Visual Guide To MCPs

Visual breakdown of MCP: How your agent, tools, and models work together.