Cloud web session (claude.ai/code) hangs indefinitely after initialization completes, zero response to any message

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?

After a Claude Code web session (claude.ai/code) fully initializes (cloud container set up, repo cloned, Claude Code started - all steps show green checkmarks), sending any message gets no response at all: no typing indicator, no streamed text, no error. It just spins indefinitely (observed 1.5+ minutes, then gave up).

This reproduces on brand-new sessions created fresh (not just old/stale ones), and refreshing the page does not recover it. The underlying session-status GET request returns 200 with no error, so it looks like the backend accepts the session but never processes/streams the actual turn.

Possibly related to these existing reports of similar "no_response" / stuck-session patterns, though those are mostly about the desktop/CLI client rather than the claude.ai/code web UI specifically:

• #45531 (Cowork stuck on "Starting session" for days)
• - #35922 (Cloud sessions infinite spinner / "Could not load cloud sessions")
• - - #68739 (all sessions return no_response immediately)

What Should Happen?

Claude should respond to the message within a reasonable time (typing indicator, then a streamed reply), like any other working session.

Error Messages/Logs

Steps to Reproduce

1. Go to claude.ai/code
2. Select a repo (e.g. jarixhew-bit/skills-github-pages) and start a brand-new session
3. 3. Wait for initialization to finish (Set up a cloud container / Cloned repository / Started Claude Code all show green checkmarks)
4. 4. Send any short message
5. 5. Observe: no typing indicator, no response, timer keeps counting (observed past 1.5 minutes); refreshing the page does not help

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

N/A - claude.ai/code web version (Research preview)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

N/A - this is a fully browser-based cloud session (claude.ai/code), not a local terminal client. Network tab showed only a GET to /v1/sessions/... returning 200; no error requests observed.