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Show HN: Cosh – An open-source AI agent orchestrator

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Cosh is an open-source coding agent and multi-agent orchestrator designed to run in a terminal. Built in Rust with a Ratatui interface, it brings software-development tools together with the ability to interact with graphical applications. Its central feature is multi-agent mode: users can run external agents such as Gemini, Claude, Codex, or Cline in split panes from a shared prompt. Each agent retains its own session, model, and optional Git worktree, while Cosh’s main agent assigns work and gathers reports. This setup aims to make several coding agents usable as a coordinated team.

For graphical interaction, Cosh reads and operates interfaces through accessibility-tree data, using screenshots only when necessary to reduce image processing and token use. Providers, models, and operating modes can be configured in the terminal interface, with the project emphasizing minimal manual setup. Its code is divided into reusable crates for development and computer tools, terminal widgets, agent-building, memory and context recall, and an optional ONNX decision engine. Installation scripts are provided for Linux and Windows; macOS is untested. The Apache-2.0-licensed project’s roadmap includes an optional ONNX engine and graph-based orchestration for coordinating multiple agent harnesses.

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