Documentation
Build with Phoson
The open-source agent engine and terminal CLI — framework-free, multi-provider, and built to be extended.
phoson-engine-minimal
Framework-free Python runtime for autonomous agents. Custom ReAct loop built directly on provider SDKs — multi-provider, typed events, branchable sessions, cost tracking, and an interactive CLI.
Framework-freeMulti-providerTyped eventsBranchable sessionsMIT
What you can build
Streaming AI
Real-time token-by-token responses with a typed event stream
Branchable Sessions
Rewind and branch conversations with ConversationTree
Tools & MCP
@tool decorator and MCP servers with pooled sessions
Multi-Provider
OpenAI, Anthropic, Gemini, OpenRouter, Ollama and more