[BUG] [Desktop App macOS / Cowork] Responses do not appear until user sends another message or navigates away and back

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

In the Cowork section of Claude Desktop for macOS, Claude's responses are not rendered/displayed after being generated. The response only becomes visible when the user either:

1. Sends a follow-up message in the thread, or
2. Navigates away from the conversation and then back into it

This happens on every single message — not intermittently. Cowork mode is essentially unusable without constant manual workarounds.

Steps to Reproduce:

1. Open Claude Desktop on macOS
2. Go to the Cowork section
3. Start a new task or open an existing one
4. Send any message to Claude
5. Observe that Claude's response does not appear, even though the loading indicator may stop

The response appears to be generated successfully (it shows up after refresh), suggesting the issue is purely in the frontend rendering, not in the API/backend.

What Should Happen?

Claude's response should render and become visible in the conversation immediately after generation completes, without requiring any user interaction to trigger display.

Error Messages/Logs

Steps to Reproduce

1. Open Claude Desktop on macOS
2. Navigate to the Cowork section
3. Start a new task or open an existing one
4. Send any message to Claude
5. Observe that Claude's response does not appear — the chat area remains blank or shows a loading state indefinitely
6. Send another message OR navigate away from the task and back
7. The previous response now appears

This is reproducible on every single message in Cowork mode.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

N/A — this is a Claude Desktop App UI issue, not Claude Code CLI

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Note: This bug is in the Cowork section of the Claude Desktop App UI, not the Claude Code CLI. Filing here as this appears to be the primary issue tracker for Claude products.

• Platform: Claude Desktop for macOS — Cowork mode
• Frequency: 100% reproducible on every message
• The response is successfully generated (confirmed because it appears after navigating away and back), so this appears to be a frontend rendering/state update issue rather than an API or backend problem.
• This may be related to a rendering race condition in the Electron app's Cowork UI where the state update from a completed response does not trigger a re-render of the conversation view.