GitHub Copilot OpenCode OAuth Plugin for OMP

This plugin overrides OMP's built-in github-copilot provider so GitHub Copilot uses the OpenCode OAuth app instead of VSCode-extension impersonation.

It keeps the normal github-copilot/<model> model names, reuses OMP's Copilot request shaping and billing headers, and stores a direct GitHub OAuth token for all Copilot API calls.

What It Changes

• Replaces the built-in GitHub Copilot transport with an override that still uses OMP's exported Copilot provider helpers.
• Uses the OpenCode OAuth app client ID Ov23li8tweQw6odWQebz.
• Uses direct GitHub OAuth bearer tokens against https://api.githubcopilot.com.
• Preserves the standard github-copilot/* model IDs instead of introducing a parallel provider namespace.
• Preserves the Copilot request-shaping path that controls headers like X-Initiator and premium-request accounting.

Install

Supported upstream install path once the package is published:

omp plugin install omp-github-copilot-opencode

Local development fallback:

git clone https://github.com/inprealpha/omp-github-copilot-opencode.git
cd omp-github-copilot-opencode
bun install
omp plugin link "$PWD"

If OMP is already running, reload extensions once:

/reload-plugins

Login

After the plugin is installed, use this inside OMP interactive mode:

/copilot-opencode-login

Optional enterprise host/domain:

/copilot-opencode-login ghe.example.com

The plugin intentionally uses its own explicit command instead of intercepting OMP's built-in /login github-copilot flow. Successful login still writes credentials into the standard github-copilot auth slot.

If you previously authenticated GitHub Copilot with the legacy flow, re-run /copilot-opencode-login once after installing this plugin.

Use

Keep using the normal built-in models:

/model github-copilot/gpt-5
/model github-copilot/claude-sonnet-4

Nothing changes in the provider name. The plugin only replaces how authentication and transport are resolved.

Logout

/copilot-opencode-logout

Or use OMP's regular logout flow for github-copilot.

Verification

Run the package check locally:

bun run check

Publish

This repo is intended to be published to npm so upstream OMP can install it through omp plugin install.

Manual publish:

bun publish

GitHub Actions publish:

• Set the NPM_TOKEN repository secret.
• Run the publish workflow manually or publish a GitHub release.

Notes

• The supported login path is /copilot-opencode-login. OMP's built-in /login github-copilot still runs the core flow and is intentionally not intercepted by this plugin.
• Upstream OMP does not currently load omp.extensions from marketplace-installed repo caches, so marketplace installation is intentionally not used for this plugin.
• If you installed an older marketplace build of this repo, remove it with omp plugin uninstall omp-github-copilot-opencode@omp-github-copilot-opencode and reinstall via package install or local link.
• This plugin depends on the exported @oh-my-pi/pi-ai helpers instead of copying Copilot request-shaping code, so future upstream transport changes are easier to inherit by updating the dependency.