Show HN: Endo – A Higher-Order Harness

Endo is a Higher-Order Harness (HOH).From the easiest concept to understand to the more complex ones, Endo gives you:
* A single, simple UI to use any agent provider with your existing subscriptions, and hot-swap agents right in the middle of a session.
* An orchestration layer, which I call HOH, allowing arbitrary composition of agents to achieve any workflow. A fun case I tried was asking Fable and Astra to mock a presidential debate.
* An agent protocol that abstracts any agent. The key insight here is that every LLM is an agent—instead of treating the LLM as just one node inside an external ReAct loop.Endo was a concept formed while I was building OpenChart (https://github.com/longsurf-ai/openchart). To power trading workflows, I needed to support scenarios where strict determinism is required, while still keeping the flexibility of an agent's inference-time decision-making capability. A new form factor was needed between rigid n8n-style workflows and open-ended ReAct loop agents.Thus the creation of Endo. Endo is short for Endomorphism, a term rooted in category theory and functional programming. An endomorphism is a function that transforms an object into another object of…