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Agent Harness

OpenCode

Verified Sep 2026

Open-source terminal coding agent

The most-starred open coding agent of 2025: LLM-agnostic, MCP-native, built for terminal lovers.

The open-source terminal coding agent (SST team): TUI with LSP integration, provider-agnostic, and a shared-client architecture. The community's Claude Code alternative.

Who it's for

Developers who want a terminal coding agent that is 100% open source and client/server based.

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Concepts in the glossary

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OpenCode features

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OpenCode works with

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