plat 463

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PLAT-463 — "New chat" button in the workflow chat

Coordination	Value
State	fixed on main; not deployed
Date	2026-10-04
Owner	frontend-chat
Related	PLAT-425 (provider change relaunches the chat)

Source

The owner could not restart a workflow's Builder CLI (a Muse chat with no MCP bridge) because the workflow chat had no way to start a fresh conversation. Code and Video Studio already show the composer's "New chat" button; the workflow chat did not.

Done

• WorkflowLayout.tsx: the workflow chat passes showNewChatAction to ChatArea for anyone who can write the workflow (a read-only viewer of a shared workflow does not get it). The existing handler stops the running session, then gives the tab a new session; the old conversation stays in Previous chats because each Builder session keeps its own transcript file.

• ChatInput.tsx: the button is no longer disabled while a turn is in flight (it was greyed out on a stuck chat, the case it is needed for). New chat already stops the old session first; the tooltip says "Stop this chat and start a new one". This applies to every product that shows the button (Code, Video Studio, Dominion).

• Found with the owner on a stuck Muse Builder chat (jobsearch): New chat gave 409 workflow_busy and the tab went back to the old chat after every click. Cause: handleStopSession marked the tracked run canceled only when the session still had a query-ID mapping; a Builder chat whose turn was lost has none, so the tracker kept listing it as running (the 409, and the workflow tab re-adopting it as the live chat). session_lifecycle.go now cancels the tracked run on every stop (TestStopSessionWithoutQueryIDsClearsTrackedBuilderChat, fails without the fix).

• ChatArea.tsx: New chat always sends the stop; it used to skip it when the active-session list did not contain the chat.

• An already-stuck run on a server started before this fix stays stuck until that server restarts (the stop of an old build never clears it).

• multiuser_identity_test.go: removed two unused fields (pathRule, sameAsPath) of the identity-row type that failed the commit hook's unused lint on main.

Left

• Not enabled in SparkQuill chats (parent/child) on purpose. MCP gateway keeps its own onNewChat handler and was not changed.
• Not tried live in the browser; the owner tests locally.