fix: add Write tool to sidebar agent + surface empty responses

browse/src/server.ts

@@ -430,7 +430,7 @@ function spawnClaude(userMessage: string, extensionUrl?: string | null): void {
 
   const prompt = `${systemPrompt}\n\n<user-message>\n${escapedMessage}\n</user-message>`;
   const args = ['-p', prompt, '--model', 'opus', '--output-format', 'stream-json', '--verbose',
-    '--allowedTools', 'Bash,Read,Glob,Grep'];
+    '--allowedTools', 'Bash,Read,Write,Glob,Grep'];
   if (sidebarSession?.claudeSessionId) {
     args.push('--resume', sidebarSession.claudeSessionId);
   }

browse/src/sidebar-agent.ts

@@ -162,7 +162,7 @@ async function askClaude(queueEntry: any): Promise<void> {
     // Use args from queue entry (server sets --model, --allowedTools, prompt framing).
     // Fall back to defaults only if queue entry has no args (backward compat).
     let claudeArgs = args || ['-p', prompt, '--output-format', 'stream-json', '--verbose',
-      '--allowedTools', 'Bash,Read,Glob,Grep'];
+      '--allowedTools', 'Bash,Read,Write,Glob,Grep'];
 
     // Validate cwd exists — queue may reference a stale worktree
     let effectiveCwd = cwd || process.cwd();

extension/sidepanel.css

@@ -306,6 +306,12 @@ body::after {
   font-family: var(--font-mono);
 }
 
+.agent-empty {
+  color: var(--muted);
+  font-size: 12px;
+  font-style: italic;
+}
+
 /* Thinking dots animation */
 .agent-thinking {
   display: flex;

extension/sidepanel.js

@@ -157,8 +157,15 @@ function handleAgentEvent(entry) {
     // Remove thinking indicator
     const thinking = document.getElementById('agent-thinking');
     if (thinking) thinking.remove();
-    // Add timestamp
     if (agentContainer) {
+      // Show notice when Claude finished but produced no text output
+      if (!agentTextEl) {
+        const notice = document.createElement('div');
+        notice.className = 'agent-empty';
+        notice.textContent = 'Done (no text output)';
+        agentContainer.appendChild(notice);
+      }
+      // Add timestamp
       const ts = document.createElement('span');
       ts.className = 'chat-time';
       ts.textContent = formatChatTime(entry.ts);