OpenFox
A local-LLM-first autonomous coding agent that turns a plan into acceptance criteria as an immutable contract, then implements against that contract, running on Ollama, vLLM, sglang or llama.cpp.
OpenFox is an autonomous coding agent built for local LLMs, using contract-driven execution: a plan turns into acceptance criteria that serve as an immutable contract for what the builder step implements.
On first run it detects and configures a local LLM backend, supporting vLLM, sglang, Ollama and llama.cpp through an OpenAI-compatible API. All of its modes, including builder, planner, verifier and sub-agents, run through one event-sourced agent loop, with declarative multi-step workflows that can mix agent turns, sub-agents, shell commands and user approval gates.
Other features include automatic vision-model fallback for models without image support, a per-file mutex that keeps parallel file edits from racing, and a local web UI. It requires Node.js 24 or later.