Goose

Goose is an open-source autonomous coding agent from Block (the company behind Square and Cash App), released in early 2026 and gaining major traction in March. Unlike traditional code completion tools or chat-based assistants, Goose operates as a true agent — it can read files, write code, run tests, call APIs, debug failures, and self-correct until a task is successfully completed, all without constant hand-holding.

Built on the Model Context Protocol (MCP), Goose integrates seamlessly with existing development environments and tool ecosystems. It runs locally on your machine, meaning your code stays on your hardware and never hits a third-party inference endpoint unless you configure it to.

Key features: - Fully autonomous: plans, executes, and iterates on complete engineering tasks - Open-source with permissive licensing - MCP-native: connects to any MCP-compatible tool, server, or data source - Local execution: code never leaves your machine by default - Model-agnostic: works with Claude, GPT-5.4, Gemini, or any compatible backend - No subscription required — free to use with your own API keys - Active community with frequent updates and extension ecosystem

Goose is particularly compelling compared to paid alternatives like Claude Code (00/month) or Devin for teams that want powerful agentic coding without recurring costs. It's best suited for developers comfortable configuring their own AI backends and who want deep customization over their workflow automation.

Available as open-source on GitHub. Requires API keys for the underlying model of your choice.