An open-source coding agent with a read-only conscience

What it does

OpenCode is an open-source AI coding agent that lives in your terminal and, more recently, in a cross-platform desktop app. It edits code and runs commands through a chat interface, toggling between a default build agent with full file access and a plan agent that refuses edits and asks permission before executing shell commands. The README is notably quiet on architecture—what model powers it, how context is managed, or whether it works offline is never stated—so expect to do some spelunking to understand the engine beneath the UI.

The interesting bit

Most coding agents assume write access is the default; OpenCode treats read-only exploration as a first-class mode, switchable with the Tab key. There is also a hidden @general subagent for complex multi-step tasks, suggesting the authors view a single monolithic agent as insufficient for real-world codebases.

Key highlights

• Terminal-first workflow with a desktop app currently in beta for macOS, Windows, and Linux
• Two built-in agents: build (full access) and plan (read-only, denies file edits by default)
• A general subagent invoked with @general for complex searches and multi-step operations
• Distribution coverage is unusually broad, spanning registries, system package managers, and a one-line installer
• README translated into roughly twenty languages, from Bosnian to Vietnamese

Caveats

• The desktop app is explicitly labeled beta
• Technical details—model provider, context strategy, offline capability—are omitted from the README; you will need to consult the external docs or source code
• The maintainers already warn third-party projects to disclaim affiliation, suggesting ecosystem sprawl that could confuse users

Verdict

Worth a look if you want an open-source alternative to closed-source coding assistants and appreciate the safety of a read-only mode, but pass if you need deep technical transparency before installing; the README reads more like a distribution manifest than a design document.