Deep Agents and OpenCode are now available in the AI SDK Harness

What's new

• @ai-sdk/harness-deepagents adapts LangChain's deepagents runtime with built-in file/shell tools, skills, host tools, multi-turn sessions, attach/resume and tool approvals
• @ai-sdk/harness-opencode boots a real OpenCode server in the sandbox via @opencode-ai/sdk and streams session events
• The OpenCode adapter lets you pick model, provider and reasoning variant
• Both run through one unified HarnessAgent API — swap runtimes without changing app code
• The harness now supports Claude Code, Codex, Deep Agents, OpenCode and Pi

Why it matters

A unified harness API reduces lock-in when building coding agents — you can A/B test different runtimes on the same task and evaluate quality vs cost without rewriting code.

How to try it

Install @ai-sdk/harness-deepagents or @ai-sdk/harness-opencode and use HarnessAgent from AI SDK 7 inside a Vercel Sandbox.