[BUG] Slash command autocomplete misses /terminal-setup on partial prefix /terminal-setu

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?

The only way to learn whether Shift+Enter is wired up — or whether it even needs to be wired up in the current terminal — is to run /terminal-setup
and read its output. On iTerm2 the response is "Shift+Enter is natively supported, no configuration needed", which is useful information that's
currently hidden behind a command invocation.

For new users (and anyone debugging a multi-line prompt issue) the question is "is my terminal set up correctly?" — and there's no way to answer it at a
glance.

What Should Happen?

Surface terminal-setup status passively, in one of these places:

• A /doctor (or similar) command that lists environment checks, including: terminal detected, Shift+Enter status (native / configured / not

configured / unsupported), Claude Code version, etc.

• A one-time toast on first launch confirming the terminal status (e.g. "iTerm2 detected — Shift+Enter works natively").
• Inline annotation on /terminal-setup in the autocomplete menu showing current status (e.g. `/terminal-setup — iTerm2 (native, no setup

needed)`).

Any of these would let users confirm setup without invoking the command.

Error Messages/Logs

Steps to Reproduce

1. Open a fresh Claude Code session in iTerm2 (Claude Code 2.1.118, macOS Darwin 25.0.0).
2. In the prompt, type /terminal-setu (one character short of the full command name).
3. Observe the autocomplete suggestion list — /terminal-setup does not appear.
4. Type the final character so the input reads /terminal-setup.
5. Observe the autocomplete suggestion list — /terminal-setup now appears.

The same behavior can be checked with shorter prefixes like /terminal or /term to confirm the command is missed at every prefix shorter than the
full name.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.118

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

<img width="1713" height="259" alt="Image" src="https://github.com/user-attachments/assets/4958728f-d7c8-4c02-b77b-de4365ca5c7b" />