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claude-code - 💡(How to fix) Fix [BUG] Web (desktop): / slash-command menu does not appear on first prompt of a cloud session

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Error Message

Error Messages/Logs

Root Cause

On the desktop web client (claude.ai/code), pressing / in the prompt input on the first turn of a fresh cloud session does not open the slash-command autocomplete menu. We know skills/commands are loaded because invoking them by typing the full name and hitting Enter works fine. Only the typeahead UI fails to mount.

Fix Action

Fix / Workaround

  • Skills are confirmed loaded server-side: the agent reports them listed in its system context from turn 0, and invoking by full name routes correctly via the Skill tool.
  • Workaround: type the full command name (no autocomplete) and submit, or send a dummy first prompt.
RAW_BUFFERClick to expand / collapse

Preflight Checklist

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

What's Wrong?

On the desktop web client (claude.ai/code), pressing / in the prompt input on the first turn of a fresh cloud session does not open the slash-command autocomplete menu. We know skills/commands are loaded because invoking them by typing the full name and hitting Enter works fine. Only the typeahead UI fails to mount.

Environment

  • Client: claude.ai/code (web)
  • Browser / OS: Chrome 147.0.7727.138 (Official Build) (arm64) / MacOS 26.3.1 (a)
  • Session type: cloud (CLAUDE_CODE_REMOTE_ENVIRONMENT_TYPE=cloud_default)
  • Claude Code version (reported by container): 2.1.42
  • Environment runner: release-b5ac58d65-ext
  • Reproducibility: every fresh session

What Should Happen?

Expected: filtered dropdown of available commands appears, as it does in the desktop CLI.

Actual: no dropdown. Subsequent characters are appended as plain text. The prompt submits as prose unless I type the full command name from memory.

Additional observations

  • Skills are confirmed loaded server-side: the agent reports them listed in its system context from turn 0, and invoking by full name routes correctly via the Skill tool.
  • Workaround: type the full command name (no autocomplete) and submit, or send a dummy first prompt.

Error Messages/Logs

Steps to Reproduce

  1. Open a new cloud session at claude.ai/code on a project that has skills available (built-in /openspec-*, /review, etc.).
  2. Before sending any prompt, click into the input box.
  3. Type /.

Expected: filtered dropdown of available commands appears, as it does in the desktop CLI.

Actual: no dropdown. Subsequent characters are appended as plain text. The prompt submits as prose unless I type the full command name from memory.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

No response

Claude Code Version

2.1.42

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

No response

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