diff --git a/packages/provider-grok/src/server/xaiAcpExtension.test.ts b/packages/provider-grok/src/server/xaiAcpExtension.test.ts
index 6b9cbf1ed30c6..a74078733d5df 100644
--- a/packages/provider-grok/src/server/xaiAcpExtension.test.ts
+++ b/packages/provider-grok/src/server/xaiAcpExtension.test.ts
@@ -458,6 +458,18 @@ describe("XAiAcpExtension", () => {
     const normalized = normalizeXAiAcpToolCallState(toolCall);
     expect(normalized.status).toBe("completed");
     expect(normalized.title).toBe("for i in 1 2; do echo STREAM_$i; done; echo STREAM_DONE");
+    expect(
+      normalizeXAiAcpToolCallState({
+        ...toolCall,
+        data: {
+          ...toolCall.data,
+          rawOutput: {
+            ...toolCall.data.rawOutput,
+            command: `git commit -m "${"x".repeat(61)}🎉 ship it"`,
+          },
+        },
+      }).title,
+    ).toBe(`git commit -m "${"x".repeat(61)}...`);
     expect(
       normalizeXAiAcpToolCallState({
         ...toolCall,
diff --git a/packages/provider-grok/src/server/xaiAcpExtension.ts b/packages/provider-grok/src/server/xaiAcpExtension.ts
index fe356d0ec0483..022dd327b55bb 100644
--- a/packages/provider-grok/src/server/xaiAcpExtension.ts
+++ b/packages/provider-grok/src/server/xaiAcpExtension.ts
@@ -549,7 +549,10 @@ function resolveXAiAcpToolTitle(toolCall: AcpToolCallState): string | undefined
     nonEmptyString(rawInput?.command) ??
     nonEmptyString(unknownRecord(toolCall.data.rawOutput)?.command);
   if (command !== undefined) {
-    return command.length > 80 ? `${command.slice(0, 77)}...` : command;
+    if (command.length <= 80) return command;
+    const splitsPair =
+      /[\uD800-\uDBFF]/.test(command.charAt(76)) && /[\uDC00-\uDFFF]/.test(command.charAt(77));
+    return `${command.slice(0, splitsPair ? 76 : 77)}...`;
   }
   return nonEmptyString(toolCall.title);
 }