HarnessAgent adds image inputs across every adapter: one message format lets ten coding agents see pictures
The HarnessAgent layer of the AI SDK now accepts image inputs across all harness adapters, letting callers pass images alongside text in the standard AI SDK message format, with a content array mixing text parts and file parts. Images are processed by each harness's underlying vision models and are supported on Claude Code, Cline, Codex, Cursor, Deep Agents, fx, GitHub Copilot, Grok Build, OpenCode and Pi. Previously this layer accepted text input only, and image capability was not part of the unified interface.