# Tray Headless — select your workspace at sign-in

**Tray Headless no longer needs a Workspace ID.** You now choose which workspace to work in during the one-time OAuth2 sign-in, and that selection is remembered for every call — there's nothing to enter, configure, or pass.

This applies across Tray Headless:

* **Claude Code plugin** — the install-time Workspace ID prompt is gone; select your workspace in the browser when you sign in.
* **Codex plugin** — the `Active Tray Workspace:` line in `AGENTS.md` is no longer needed; select your workspace during `codex mcp login tray`.
* **Tray Headless MCP** — no `workspaceId` argument on tool calls; the workspace comes from your sign-in.

To work in a different workspace, sign in again and select it. See [Tray Headless for Claude Code](https://tray.ai/documentation/platform/tray-headless/headless-for-claude-code), [Tray Headless for Codex](https://tray.ai/documentation/platform/tray-headless/headless-for-codex), or [Tray Headless MCP](https://tray.ai/documentation/platform/tray-headless/tray-headless-mcp).