Block Open Source ORG

Text-ray goggles for your Android UI.

Quiver is a collection of extension methods and handy functions to make the wonderful functional programming Kotlin library, Arrow, even better.

Schema-driven, scalable, cloud-native, batteries-included GraphQL, backed by Elasticsearch/OpenSearch

A CLI and IntelliJ IDEA plugin for formatting Kotlin code, leveraging ktfmt for consistent style enforcement.

A hive mind communication platform

AI-driven UI testing framework.

Online schema change and data operations for MySQL 8.0+

gRPC-based Remote Command Execution Agent

Run code within any debuggable Android process, without modifying its APK

Automate and expose complex infrastructure tasks to teams and services.

Manage AI rules, commands, and skills across multiple coding agents from one place.

FTL is a platform for building distributed systems that are safe to operate, easy to reason about, and fast to iterate and develop on.

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Sublime MySQL monitoring

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Give AI agents access to Xcode's index

Incubating experimental AI projects to operate millions of lines of code

Local task queuing for AI agents. Prevents multiple agents from running expensive operations concurrently and thrashing your machine.

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Proto Fleet. Mining management software. Evolved.

A Kotlin SDK for Nostr

MySQL Benchmarking: Declarative, Distributed, and Amazing

*Sunsetting*: this repo contained plugins for the alpha version of goose. These plugins have been replaced by the MCP protocol

Cachew (pronounced cashew) is a super-fast application-level pass-through cache

Finite state machinery in Kotlin

Entity API for managing primitive entities with labels

IntelliJ and Gradle plugins to gather and report IDE metrics

Parse lightning network payment requests (invoices) in Kotlin.

A commandline tool that packs and restores your Gradle cache in CI builds

A marketplace for agent skills

Planning With Agents

⛶ macOS utility for screen-capturing a QR code and launching it in an Android emulator or iOS simulator.

A Minimal UUID v7 Implementation

Mempool-based bitcoin fee estimation library

A CLI for comparing directories, files, archives, images, binary... anything!

A system for speeding up Gradle builds and IDE syncs by swapping artifacts to be used instead of gradle projects

high-confidence document q+a system for complex docs

A design language perception and infrastructure

A general-purpose project scaffolding tool inspired by cookiecutter

LLM-powered code migrations at scale

sf-deity is a data-recovery testing solution presented by the Cash App Salesforce Team at Block. This tool allows a Salesforce team to simulate data loss at a massive scale to determine necessary remediation steps in the event of catastrophe.

Code monorepo, issue tracking and other GitHub features for the Block Open Source Program Office

A background service responsible for executing and canceling long-running developer tasks.

GitOps for database schemas

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InteliJ Plugin for working with Gradle monorepos

This is a short lived repo to quickly scaffold some new UI/UX for goose

Open-source model inventory & governance. Discovers every model, rule, and pipeline across all your platforms as one immutable, agent-queryable graph — git for models.

AIttributor is a prepare-commit-msg hook that adds AI agent attribution to git commits

Agent Honk: A Goose discord bot that honks.

A local web UI for managing Amp AI coding agent threads.

a versatile code snippet extraction tool

Snap a line before your agents build.

ssh with seamless connection recovery

Documentation site for security event triage

A harness for measuring whether static analysis security tools actually find the bugs.

A set of command line tools to help working with Bazel + IntelliJ-based AI worktrees in large codebases

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Modern MySQL Archiver in GO

A Gradle plugin that automatically manages image asset compression for Android.

Bergr is a lightweight utility for inspecting Apache Iceberg tables

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Reference usage of augur, a mempool-based bitcoin fee estimation library

Square Model Context Protocol Server

Video template for devrel team plug and plays

Merges global and repo git hooks into a single lefthook config

An SDK for interacting with the Vantage API, works with various Vantage API endpoints, provides type safety via codegen Pydantic classes and manages pagination

A utility for dumping agent logs in a standard format

A type-safe Kotlin Multiplatform rules engine with composable rules, coroutine support, and observability.

Business process for Bitcoin withdrawals from Custodial platforms (such as Square and Cash App)

Generate meaningful Git commit messages using large language models (LLMs)

Show your Amp status in cmux

A kotlin library for parsing, editing, and serializing Gradle version catalogs

A Kotlin-based CLI for A/B performance testing on Android

A blank template for bootstrapping new projects, platform/language/framework independent

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An IDE plugin for Android Studio that integrates with the MDX Daemon, a background task runner designed to improve local Android developer performance.

A command line tool aim to simplify the process of making command line execution feedback up to GitHub commit via its Checks API.

Distributed LLM/AI

A Git Tree Visualizer

Universal build tool that detects project build systems and runs build, test, lint, and format operations against changed files.

An agentic code review tool that gives PR reviewers conceptual clarity and competent backpressure against the AI-generated PR firehose.

An enterprise knowledge aggregator that unifies links and internal posts so teams and individuals find what matters, stay current, and learn from each other faster.

Example to bootstrap new Java Kotlin Maven Projects

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Protocol Buffers for JavaScript & TypeScript.

PersonalShopper service POC - built on Goose, Goose Mobile, Afterpay MCP and more

a voice powered image editor

Hermit FTL packages

Houses Block's homebrew formulas and casks.

Source for opensource.block.xyz

An example of using https://github.com/block/apple-codesign-action for your open source project!

Version Guard is a Go service that collects software version and end-of-life (EOL) data from multiple sources (EOL APIs, Wiz), detects version drift across infrastructure, and pushes consolidated results to an S3 bucket.

design x ai orchestration

The control plane for distributed AI agent execution

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Shared configuration for Renovate across the Block Org

A CLI for running agents in a loop.

GitHub Pages for the Block org

A structured approach to implementing backend APIs for maximal client flexibility. It provides a framework for implementing domain-driven APIs that separate business logic from presentation concerns, making the code easier to test and reuse across different presentation layers.

A Go (Golang) client library for integrating your applications with the Iterable API.

A GitHub action for code-signing Block open source software for Apple platforms

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Helm charts for FTL

Homebrew tap for FTL

A purpose-built Go CLI tool that analyses Git repositories for security vulnerabilities using LLM-based analysis

A Go library for fetching remote archives using a clean consistent URI scheme

Start or find an agent session from anywhere

An iOS remote control for goose

AI-generated UI in an inline Arrow sandbox.

Vitess is a database clustering system for horizontal scaling of MySQL.

TiDB is built for agentic workloads that grow unpredictably, with ACID guarantees and native support for transactions, analytics, and vector search. No data silos. No noisy neighbors. No infrastructure ceiling.

test

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macOS native+container process supervisor

A pure java implementation of the LaunchDarkly client/mobile APIs

Ready Player One - framework for structured agent steering and orchestration

Python package for parsing lock files

Go types for opencli.org

A high-performance, hash-based sampling library for Go.

FTL Online Boutique Example

Proxy that can handle the authentication parts of the MySQL protocol

[mirror] Go Tools

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