jcode v0.12.4 ships as a provider-agnostic Rust coding harness

jcode hit v0.12.4 on 23 May 2026, sitting at roughly 6,500 GitHub stars across 66 releases. Open source (MIT), Rust core, supports Claude / OpenAI / Gemini / Copilot as interchangeable backends, with built-in browser automation, persistent agent memory, and multi-agent swarms. Positioned as an alternative to the Claude Code / Cursor lock-in pattern; if you've been wanting an agent harness where the model behind the curtain is genuinely swappable, jcode is the cleanest current attempt. Worth a Friday evening if you're in that bucket.