Hecate
A self-hosted, multi-tenant agent platform that combines a Python API for engineers with a drag-and-drop visual canvas for business users, backed by an event-sourced, durable execution engine.
Hecate logs every execution step as an append-only event with durable checkpoints, so any session can be replayed for debugging through its API; long-running work supports durable retry, resume, controlled interruption and human-in-the-loop approval, with built-in tools including a sandboxed headless Chromium with per-environment domain allowlists.
Its workflow definition syncs bidirectionally between the Python code and the visual canvas as one JSON graph, so what is built visually is the same workflow the code defines. Multi-tenancy runs through an org-to-workspace RBAC model with SSO and SCIM, an audit trail, and PII redaction built in rather than bolted on.
It speaks MCP, server and client, A2A, server and client, and an OpenAI-compatible API, so it can act as a drop-in replacement wherever an OpenAI client is expected; it is MIT licensed and currently alpha software.