@op1/opencode-subagent-model

An OpenCode TUI plugin. When you open a subagent (child) session, it shows which agent and model that session runs, directly above the composer:

vera-engineer-readonly openai/gpt-5.6-sol#max

Root sessions are left untouched. OpenCode's built-in task cards show the subagent's type and description but not its model; this plugin fills that gap.

Install

Install the npm package:

opencode plugin add @op1/opencode-subagent-model@0.1.3

This adds the package to ~/.config/opencode/opencode.jsonc:

{
	"$schema": "https://opencode.ai/config.json",
	"plugins": ["@op1/opencode-subagent-model@0.1.3"]
}

Restart the TUI. Open any subagent session to see its agent and model.

How it works

The plugin claims the session.composer.top slot. For the session being viewed, it reads parentID, agent, and model from the synced session data. If the session has a parent, it renders agent providerID/modelID#variant in the muted theme color. Sessions without a parent render nothing.

Compatibility

This release targets OpenCode 2.0.3 and pins @opencode/plugin to that version. Run the typecheck when updating OpenCode dependencies.

Develop

npm ci
npm run verify:static

The static check typechecks the source, compiles the plugin, creates a tarball, and checks that every export contains valid JavaScript. Artifacts go under .artifacts/. It requires Node.js and Bun and does not connect to OpenCode.

The package ships compiled dist/index.js and dist/tui.js. The build uses OpenTUI's Solid transform so installation does not depend on the host compiling TSX inside node_modules.

Verify in OpenCode

With the npm package installed, run:

npm run verify:live

The live check requires Python 3, a running OpenCode service, and an existing child session. It checks the active package version, opens a TUI, and verifies the displayed agent/model label. It does not send a prompt. To choose a session:

npm run verify:live -- --session ses_example

Before publishing, use the packed plugin directory printed by verify:static as the plugin entry in your global config, then run:

npm run verify:live -- --packed

After publishing, replace that local entry with the npm package and rerun npm run verify:live. The terminal capture is saved to .artifacts/verify-live.txt.

Release

1. Run npm run verify:static and the packed live check.
2. Publish the resulting .artifacts/*.tgz with npm publish <tarball> --access public.
3. Install the published version and run npm run verify:live.