DeepSeek Harness can hand work to Codex or Claude CLI subagents, Vercel's HarnessAgent runs over every major harness adapter, and HumanLayer coordinates Claude Code, Codex, OpenCode and Pi across machines. Builders should plan for agent sessions that get handed off between people and harnesses, not ones owned by a single user in a single tool.
From the Field Notes:
- Delta (from Zed) makes Claude Code sessions multiplayer with /delta share (2026-10-27)
- Delta CLI — Sync and share agent sessions from your terminal (2026-10-28)
- Ponte: open-source, end-to-end encrypted channel that lets two developers' coding agents message each other over MCP (2026-10-27)
- DeepSeek Harness ships dsh-v0.2.2-alpha.2 with plugin updates, six new UI languages and an experimental Codex/Claude CLI subagent tool (2026-10-28)
- Vercel AI SDK HarnessAgent now accepts image inputs across all harness adapters (2026-10-28)
- humanlayer: The best way to get AI coding agents to solve hard problems in complex codebases (2026-10-26)
- OpenBot is a source-available desktop app from Nightly Labs, operating as Synthetify Labs, that runs multiple persistent AI agents from one interface. (2026-10-27)