Headroom Kit

Run an existing coding agent through a local Headroom proxy. Kit owns routing, Copilot authentication, editor isolation, and the shared proxy. Headroom owns compression and metrics. This package does not install agents, replace the headroom command, or download Python packages when an agent launches.

agent -> headroom-kit -> Headroom on 127.0.0.1 -> model provider

Install

You need Python 3.13 and the agent you want to launch. Kit and its pinned Headroom dependency install into the same environment:

uv tool install --python 3.13 headroom-kit

A normal virtual environment works too:

uv venv --python 3.13
uv pip install headroom-kit
. .venv/bin/activate

Do not point Kit at a separate headroom executable. It imports Headroom's Python modules. Copilot login is headroom-kit copilot-auth login in that same install. Headroom may still download its own model files on first proxy startup. That is separate from installing this package.

Check both versions without starting a proxy:

headroom-kit --version

Set up with an agent

This repository includes install-headroom-kit, an Agent Skill that installs the CLI and checks the Headroom version without starting a proxy.

The skills CLI can install it for the current project:

npx skills add ruarfff/headroom-kit --skill install-headroom-kit

Make it available to your agents:

npx skills add ruarfff/headroom-kit --skill install-headroom-kit --agent '*' --global --yes

See the skills CLI documentation.

Commands

headroom-kit [--config PATH] run <agent> -- <agent arguments...>
headroom-kit copilot-auth login
headroom-kit status
headroom-kit stop <port>

Agents: codex, codex-app, copilot, copilot-vscode, pi, opencode.

headroom-kit copilot-auth login
headroom-kit run codex --
headroom-kit run copilot -- --model auto
headroom-kit run pi -- --provider openai --model <model-id>
headroom-kit run opencode --
headroom-kit status
headroom-kit stop 8787

Arguments after -- are forwarded unchanged. headroom-kit run codex -- --help shows Codex help and does not start a proxy. status and stop do not need provider credentials or model downloads.

Shared proxies stay up after the client exits. Stopping one interrupts every client on that port. Kit will not adopt or stop an unrelated listener. An incompatible managed proxy must be stopped explicitly before a new one can use the port.

Configure

Built-in defaults are enough for a normal install. --config accepts a JSON object of non-secret integration defaults. Precedence is HEADROOM_* environment variables, then the file, then the built-in defaults. See configuration.

HEADROOM_VERSION, and config keys version, uv, and python, are rejected. Install the tested Headroom release instead of selecting one at launch.

Agents

Install and sign in to the agent yourself. Kit does not install it.

Windows is not part of this package. Linux and macOS CLI lifecycle checks run in CI. GUI behaviour is platform-specific; live Linux agent support is not verified. Details are in usage and validation.

MIT. See NOTICE for attribution.