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studio/frontend: scope Working fallback to tool-using responses only

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Codex P2 flagged that the 'Working...' fallback fired for every
streaming text-only response. For a plain 'What is 2+2?' answer the
indicator briefly showed alongside the visible streaming text, which
was misleading.

Fix: track whether any tool-call part exists in the message (running OR
completed) and only emit the 'Working...' fallback when tools have been
in play. Pure text-only responses skip the fallback entirely; tool
gaps and back-to-back tool calls still get the indicator.
This commit is contained in:
danielhanchen 2026-05-19 14:35:36 +00:00
commit d64b4b84f6
1 changed files with 17 additions and 7 deletions
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24
studio/frontend/src/components/assistant-ui/thread.tsx
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@ -1020,6 +1020,11 @@ const CancelledIndicator: FC = () => {
// doesn't look frozen during the gap between "model wrote intent" and
// "tool actually invoked", or between back-to-back tool calls.
//
// Scope: only fires for tool-using responses. Plain text-only answers
// keep using GeneratingIndicator (while content is empty) and then
// nothing -- otherwise every text streaming response would get a
// misleading "Working..." row.
//
// Return value is a string ("tool:<name>" | "working" | "") rather than
// an object so useAuiState's referential-equality memoization holds
// across renders -- returning a fresh object each render would invalidate
@ -1028,19 +1033,24 @@ const RunningToolIndicator: FC = () => {
const signal = useAuiState(({ message }) => {
if (message.status?.type !== "running") return "";
const parts = message.parts;
let sawToolCall = false;
let runningTool: string | null = null;
// Single pass: find any tool-call part (signals tools-are-in-play)
// and the most-recent running one (drives the specific indicator).
for (let i = parts.length - 1; i >= 0; i -= 1) {
const p = parts[i] as
| { type?: string; toolName?: string; status?: { type?: string } }
| undefined;
if (p?.type === "tool-call" && p.status?.type === "running") {
return `tool:${p.toolName ?? "tool"}`;
if (p?.type !== "tool-call") continue;
sawToolCall = true;
if (!runningTool && p.status?.type === "running") {
runningTool = p.toolName ?? "tool";
}
}
// No tool currently running, but message is still streaming.
// GeneratingIndicator hides once content.length > 0, so once any
// text has rendered we lose its dots. Surface a generic "Working..."
// so the chat doesn't go silent between phases.
if (parts.length > 0) return "working";
if (runningTool) return `tool:${runningTool}`;
// Only fall back to "Working..." if tools have been in play. A pure
// text-only response (no tool-call part ever) skips the fallback.
if (sawToolCall) return "working";
return "";
});
if (!signal) return null;