Endo - The Higher Order Harness (HOH)

Endo is a macOS application that functions as a Higher Order Harness (HOH), allowing users to compose, run, and switch between AI agents like Codex, Claude Code, and Antigravity within a single chat interface. It supports seamless agent composition, persistent session history, workflows written in TypeScript, scheduling of prompt executions, and agent tools integration. Endo enables flexible AI workflows leveraging multiple providers under one unified protocol, aimed at indie developers and AI enthusiasts.