diff --git a/backend/open_webui/utils/middleware.py b/backend/open_webui/utils/middleware.py
index 878d5b3f2..e96faf3c1 100644
--- a/backend/open_webui/utils/middleware.py
+++ b/backend/open_webui/utils/middleware.py
@@ -444,7 +444,7 @@ def serialize_output(output: list) -> str:
                 files = result_item.get('files')
                 embeds = result_item.get('embeds', '')
 
-                content += f'<details type="tool_calls" done="true" id="{call_id}" name="{name}" arguments="{html.escape(json.dumps(arguments))}" result="{html.escape(json.dumps(result_text, ensure_ascii=False))}" files="{html.escape(json.dumps(files)) if files else ""}" embeds="{html.escape(json.dumps(embeds))}">\n<summary>Tool Executed</summary>\n</details>\n'
+                content += f'<details type="tool_calls" done="true" id="{call_id}" name="{name}" arguments="{html.escape(json.dumps(arguments))}" files="{html.escape(json.dumps(files)) if files else ""}" embeds="{html.escape(json.dumps(embeds))}">\n<summary>Tool Executed</summary>\n{html.escape(json.dumps(result_text, ensure_ascii=False))}\n</details>\n'
             else:
                 content += f'<details type="tool_calls" done="false" id="{call_id}" name="{name}" arguments="{html.escape(json.dumps(arguments))}">\n<summary>Executing...</summary>\n</details>\n'
 
diff --git a/src/lib/components/chat/Messages/Markdown/MarkdownTokens.svelte b/src/lib/components/chat/Messages/Markdown/MarkdownTokens.svelte
index 961b73192..da4deaaa1 100644
--- a/src/lib/components/chat/Messages/Markdown/MarkdownTokens.svelte
+++ b/src/lib/components/chat/Messages/Markdown/MarkdownTokens.svelte
@@ -380,6 +380,7 @@
 						<ToolCallDisplay
 							id={`${id}-${tokenIdx}-${detailIdx}-tc`}
 							attributes={detailToken.attributes}
+							resultContent={getDetailTextContent(detailToken)}
 							grouped={true}
 							open={$settings?.expandDetails ?? false}
 							className="w-full space-y-1"
@@ -428,6 +429,7 @@
 			<ToolCallDisplay
 				id={`${id}-${tokenIdx}-tc`}
 				attributes={token.attributes}
+				resultContent={getDetailTextContent(token)}
 				open={$settings?.expandDetails ?? false}
 				className="w-full space-y-1"
 			/>
diff --git a/src/lib/components/common/ToolCallDisplay.svelte b/src/lib/components/common/ToolCallDisplay.svelte
index 1bead4b4d..a21626ede 100644
--- a/src/lib/components/common/ToolCallDisplay.svelte
+++ b/src/lib/components/common/ToolCallDisplay.svelte
@@ -77,7 +77,9 @@
 	}
 
 	$: args = decode(attributes?.arguments ?? '');
-	$: result = decode(attributes?.result ?? '');
+	export let resultContent: string = '';
+
+	$: result = resultContent || decode(attributes?.result ?? '');
 	$: files = parseJSONString(decode(attributes?.files ?? ''));
 	$: embeds = parseJSONString(decode(attributes?.embeds ?? ''));
 	$: isDone = attributes?.done === 'true';
diff --git a/src/lib/utils/index.ts b/src/lib/utils/index.ts
index 68ac38e56..ecaeefab0 100644
--- a/src/lib/utils/index.ts
+++ b/src/lib/utils/index.ts
@@ -923,8 +923,19 @@ export const processDetails = (content) => {
 				attributes[attributeMatch[1]] = attributeMatch[2];
 			}
 
+			// New format: result in body content; Old format: result in attribute
+			let resultText = '';
 			if (attributes.result) {
-				content = content.replace(match, unescapeHtml(attributes.result));
+				resultText = unescapeHtml(attributes.result);
+			} else {
+				// Extract body content (strip <summary>...</summary>)
+				const bodyMatch = match.match(/<summary>[\s\S]*?<\/summary>\s*([\s\S]*?)\s*<\/details>/i);
+				if (bodyMatch && bodyMatch[1].trim()) {
+					resultText = unescapeHtml(bodyMatch[1].trim());
+				}
+			}
+			if (resultText) {
+				content = content.replace(match, resultText);
 			}
 		}
 	}
diff --git a/src/lib/utils/marked/extension.ts b/src/lib/utils/marked/extension.ts
index eec17adbd..13f9f7cdc 100644
--- a/src/lib/utils/marked/extension.ts
+++ b/src/lib/utils/marked/extension.ts
@@ -60,7 +60,7 @@ function detailsTokenizer(src: string) {
 }
 
 function detailsStart(src: string) {
-	return src.match(/^<details>/) ? 0 : -1;
+	return src.match(/^<details[\s>]/) ? 0 : -1;
 }
 
 function detailsRenderer(token: any) {