Block Open Source

Local open-source AI agent from Block that builds projects, writes and executes code, and debugs issues autonomously.

Android library that prints the view hierarchy or Jetpack Compose tree as a string for debugging and bug reports.

Rust tool for managing AI rules, commands, and skills across multiple coding agents from one place.

AI-driven Android UI testing framework where plain-language test descriptions let an agent drive the app.

Scans Git repositories for security vulnerabilities with LLM analysis, delivered as a Go CLI.

Incubator for AI coding projects aimed at operating codebases spanning millions of lines of code.

Schema-driven GraphQL framework that runs on Elasticsearch or OpenSearch, written in Ruby.

Extensible MySQL metrics collector and monitor written in Go by Block.

Local queue that stops multiple AI agents from running expensive operations at once and thrashing your machine.

Go library implementing a fast pass-through cache at the application level.

CLI and IntelliJ plugin that formats Kotlin code, enforcing a consistent style via ktfmt.

Collaborative tool for planning AI coding workflows together with agents, built in Ruby.

Agentic review tool that helps PR reviewers keep conceptual clarity against a firehose of AI-generated pull requests.

Kotlin library that estimates Bitcoin transaction fees from mempool data for wallets and services.

Screen-captures a QR code on your macOS display and opens it in an Android emulator or iOS simulator.

MCP server that gives AI coding agents access to Xcode's project index.

CLI that runs coding agents in a loop, driving long-running workflows with structured iteration.

SSH client that reconnects transparently after network drops, keeping shell sessions alive across switches and sleeps.

Answers questions over dense technical documents while holding down LLM hallucination rates.

MCP server that lets AI agents control and execute code inside Jupyter notebooks.

Git prepare-commit-msg hook written in Rust that adds AI agent attribution to commits.

Runs a local web UI for browsing and managing threads from the Amp AI coding agent.

Renders git history and branch topology so commits, branches, and merges are visible at a glance.

Displays Amp coding agent status inside the cmux terminal multiplexer for a unified view.