diff --git a/vibn-frontend/app/api/chat/route.ts b/vibn-frontend/app/api/chat/route.ts
index d4b4f67..b06a9a3 100644
--- a/vibn-frontend/app/api/chat/route.ts
+++ b/vibn-frontend/app/api/chat/route.ts
@@ -628,6 +628,30 @@ function extractPreviewUrl(messages: ChatMessage[]): string | undefined {
   return undefined;
 }
 
+
+function summarizeForUI(raw: string): string {
+  try {
+    const p = JSON.parse(raw);
+    if (p && typeof p === "object") {
+      const clone = { ...p };
+      // Strip massive payload fields so the UI gets intact JSON
+      if (clone.result && typeof clone.result === 'object') {
+         if (clone.result.log) clone.result.log = "...";
+         if (clone.result.content) clone.result.content = "...";
+         if (clone.result.listing) clone.result.listing = "...";
+      }
+      if (typeof clone.stdout === 'string' && clone.stdout.length > 200) {
+        clone.stdout = clone.stdout.slice(0, 200) + "...";
+      }
+      if (typeof clone.stderr === 'string' && clone.stderr.length > 200) {
+        clone.stderr = clone.stderr.slice(0, 200) + "...";
+      }
+      return JSON.stringify(clone);
+    }
+  } catch {}
+  return raw.slice(0, 500);
+}
+
 export async function POST(request: Request) {
   await ensureChatTables();
 
@@ -1109,7 +1133,7 @@ export async function POST(request: Request) {
             emit({
               type: "tool_result",
               name: tc.name,
-              result: result.slice(0, 500),
+              result: summarizeForUI(result),
             });
             messages.push({
               role: "tool",
@@ -1322,7 +1346,7 @@ export async function POST(request: Request) {
             emit({
               type: "tool_result",
               name: tc.name,
-              result: result.slice(0, 500),
+              result: summarizeForUI(result),
             });
 
             messages.push({
diff --git a/vibn-frontend/components/vibn-chat/chat-panel.tsx b/vibn-frontend/components/vibn-chat/chat-panel.tsx
index c0eb0ae..81ee9d2 100644
--- a/vibn-frontend/components/vibn-chat/chat-panel.tsx
+++ b/vibn-frontend/components/vibn-chat/chat-panel.tsx
@@ -284,11 +284,14 @@ function summarizeToolResult(result?: string): {
   }
 
   // Plain-text heuristics
+  // We explicitly ignore 'error' and 'exception' here because tools like dev_server_logs
+  // or browser_console legitimately return stack traces when working correctly.
+  // A raw string with 'error' inside it shouldn't auto-fail the tool execution pill.
   const lower = raw.toLowerCase();
   if (
-    /(econnrefused|enoent|error|failed|traceback|exception|not found|permission denied|cannot)/.test(
+    /(econnrefused|enoent|permission denied|command not found)/.test(
       lower,
-    )
+    ) && !raw.includes("dev_server_logs") && !raw.includes("browser_console")
   ) {
     return { ok: false, label: `Failed — ${firstLine(raw)}` };
   }
@@ -1548,12 +1551,15 @@ export function ChatPanel({
                       }
                     } catch {
                       // 2. If it's a raw string (like a bash crash), scan for fatal keywords
+                      // We skip this check for log-reading tools since they legitimately contain errors.
                       const lower = ev.result.toLowerCase();
                       if (
-                        lower.includes("error") ||
-                        lower.includes("failed") ||
-                        lower.includes("unexpected") ||
-                        lower.includes("not found")
+                        !ev.name?.includes("logs") &&
+                        !ev.name?.includes("console") &&
+                        (lower.includes("econnrefused") ||
+                         lower.includes("enoent") ||
+                         lower.includes("permission denied") ||
+                         lower.includes("command not found"))
                       ) {
                         isToolErr = true;
                       }