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feat(frontend): Show thinking indicator between CoPilot tool calls #12203

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feat(frontend): Show thinking indicator between CoPilot tool calls #12203

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675218c
feat(frontend): show thinking indicator between CoPilot tool calls
Otto-AGPT Feb 25, 2026
592e967
fix(frontend/copilot): use correct ToolUIPart state for thinking indi…
0ubbe Feb 25, 2026
ab06840
Merge branch 'dev' into otto/secrt-2035-thinking-indicator-between-st…
0ubbe Feb 25, 2026
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42 changes: 32 additions & 10 deletions ...end/src/app/(platform)/copilot/components/ChatMessagesContainer/ChatMessagesContainer.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@ import {
} from "@/components/ai-elements/message";
import { LoadingSpinner } from "@/components/atoms/LoadingSpinner/LoadingSpinner";
import { ToolUIPart, UIDataTypes, UIMessage, UITools } from "ai";
import { useEffect, useState } from "react";
import { useEffect, useRef, useState } from "react";
import { CreateAgentTool } from "../../tools/CreateAgent/CreateAgent";
import { EditAgentTool } from "../../tools/EditAgent/EditAgent";
import {
Expand Down Expand Up @@ -146,12 +146,7 @@ export const ChatMessagesContainer = ({
headerSlot,
}: ChatMessagesContainerProps) => {
const [thinkingPhrase, setThinkingPhrase] = useState(getRandomPhrase);

useEffect(() => {
if (status === "submitted") {
setThinkingPhrase(getRandomPhrase());
}
}, [status]);
const wasThinkingAfterTool = useRef(false);

const lastMessage = messages[messages.length - 1];
const lastAssistantHasVisibleContent =
Expand All @@ -162,9 +157,36 @@ export const ChatMessagesContainer = ({
p.type.startsWith("tool-"),
);

// Detect when the LLM is thinking after a completed tool call
const lastPart =
lastMessage?.role === "assistant" && lastMessage.parts.length > 0
? lastMessage.parts[lastMessage.parts.length - 1]
: undefined;

const isThinkingAfterToolCall =
status === "streaming" &&
lastPart !== undefined &&
lastPart.type.startsWith("tool-") &&
(lastPart as ToolUIPart).state === "output-available";

const showThinking =
status === "submitted" ||
(status === "streaming" && !lastAssistantHasVisibleContent);
(status === "streaming" && !lastAssistantHasVisibleContent) ||
isThinkingAfterToolCall;

useEffect(() => {
if (status === "submitted") {
setThinkingPhrase(getRandomPhrase());
}
}, [status]);

// Pick a new phrase when entering "thinking after tool call" state
useEffect(() => {
if (isThinkingAfterToolCall && !wasThinkingAfterTool.current) {
setThinkingPhrase(getRandomPhrase());
}
wasThinkingAfterTool.current = isThinkingAfterToolCall;
}, [isThinkingAfterToolCall]);

return (
<Conversation className="min-h-0 flex-1">
Expand Down Expand Up @@ -296,8 +318,8 @@ export const ChatMessagesContainer = ({
}
})}
{isLastAssistant &&
!messageHasVisibleContent &&
showThinking && (
showThinking &&
(!messageHasVisibleContent || isThinkingAfterToolCall) && (
<span className="inline-block animate-shimmer bg-gradient-to-r from-neutral-400 via-neutral-600 to-neutral-400 bg-[length:200%_100%] bg-clip-text text-transparent">
{thinkingPhrase}
</span>
Expand Down