OpenCode

Type: full-code · Vendor: anomalyco / open-source community · Language: TypeScript · License: MIT · Status: active · Status in practice: mature

Links: homepage docs repo

The open source AI coding agent for the terminal, model- and provider-agnostic.

Description. Terminal-native open-source coding agent with a dual-agent model: a build agent with full development access and a plan agent for read-only exploration, switchable via Tab, plus a general subagent for complex search and multistep tasks. Broad model-provider support, LSP integration and a beta desktop app. One of the most-starred open-source coding agents.

Agent loop shape. ReAct-style tool loop with a mode switch: the plan agent explores read-only; on switch the build agent edits files and runs commands. A general subagent handles isolated multistep search tasks.

Primary use cases

terminal-native agentic coding across many model providers
read-only planning then full-access execution
delegating complex search/multistep work to a subagent

flowchart TD USER[Prompt] --> MODE{Plan or build?} MODE -->|plan| EXPLORE[Read-only exploration] EXPLORE --> MODE MODE -->|build| LOOP[Tool loop: read/edit/run] LOOP --> SUB[General subagent<br/>isolated search] SUB --> LOOP LOOP --> OUT[Changes] PROVIDERS[(Many model providers)] -.power.-> LOOP

Key concepts

Build / plan agents → plan-and-execute (docs) — Full-access build agent and read-only plan agent, switchable via Tab.
General subagent → subagent-isolation — Isolated agent for complex search and multistep tasks.