Custom slash commands blocked

“The composer recognizes and highlights the command and shows it in autocomplete, but on send it is blocked with a warning and nothing is sent.”

Is this your bug? What gets counted gets fixed. Pile on.

Paste this into your agent. It files your report, with your error and version.

I hit this bug: rapsheet.dev/sheets/claude-code/issues/538/file
Follow it to file my report. Show me the text before you send.

No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends

Fading. No reports and thumbs-up in the last 7 days and 1 the week before, down from 5 a week at the late-September peak.

Custom slash commands with non-ASCII or punctuation names blocked on send. Composer recognizes and highlights the command and offers it in autocomplete, but on send shows a warning that only file @mentions are allowed and nothing is sent.

Is this your bug?

File my report

Where: Desktop Code tab composer
Versions: 2.1.183 to 2.1.296
Platforms: macOS, Windows
How bad: Breaks a normal workflow. Most reports say it used to work.

Original reports3, newest first

Oct 31, 2026[Desktop Code tab] A slash command whose name is ASCII punctuation (e.g. #) is rejected on send#106418
Oct 2, 2026Custom slash commands with non-ASCII (Japanese) names cannot be sent from the composer#98925
Sep 30, 2026[Desktop Code tab] Slash commands with non-ASCII (Korean) names are rejected on send#98577

Custom slash commands blocked

Is this your bug? What gets counted gets fixed. Pile on.

Is this your bug?

Original reports3, newest first

Do you work on Claude Code?