Keep the harness, change the model. A self-hosted single-binary gateway that lets Claude Code and Codex CLI run any model — open-weight, self-hosted, or from whatever relay you pay for — by translating between Anthropic Messages, OpenAI Responses and Chat Completions.
2 files for Codex, OpenCode and Claude Code: portage AGENTS.md, portage CLAUDE.md — 939 tokens loaded in every session.
AGENTS.md A 936 tok CLAUDE.md A 3 tok These files are SimonGino/portage's own configuration — they tell Codex, OpenCode and Claude Code how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.