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Show HN: Endo – A Higher-Order Harness

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Endo is a Higher-Order Harness (HOH) that treats LLM agents as composable building blocks, providing a unified chat interface where you can combine, switch between, and continue conversations with different providers inside one thread. It connects to Codex, Claude, Gemini/Antigravity natively through their CLIs using your existing subscriptions (no API keys to paste) and funnels every provider through a single protocol so tool calls, permission prompts, streaming, and history behave consistently. Endo supports workflows like /best-of-n, /multi-turn-debate, /thesis-killer and scheduled runs, persistent sessions and “Dig In” side-conversations that branch from any part of an answer while preserving the main thread and history across restarts.

Workflows are authored as TypeScript files in a workspace using primitives such as agent(), parallel(), phase(), and session IDs; a Workflow card visualizes each call and final result. Developers can add Resources (typed Drizzle tables + Effect Schemas) for shared state, register agent tools, tweak prompt segments, add UI pages/features, and build signed macOS releases. The project provides a downloadable macOS app and source build instructions (Node 24, Bun 1.4.2, Just), is MIT-licensed, credits several UI and agent tool projects, and is at 0.1.x so breaking changes are expected.

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