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umbel

Spawns Claude, Codex, Gemini or OpenCode workers in tmux.

  • AI tool
  • Free

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Pricing

Free and open source (MIT).

Overview

umbel lets a host agent spawn and drive Claude, Codex, Gemini or OpenCode workers in tmux from a CLI, MCP server or YAML workflow. The host gets tools such as umbel_spawn, send, wait, read and kill. One binary covers the providers so agents can run reviewers and testers in parallel.

Key features

  • tmux workers across providers
  • CLI, MCP and YAML
  • spawn / send / wait / read / kill

Use cases

Show all 6Show fewer

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Last updated 2026-11-06

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