[Bug] Haiku 4.5 confused by custom slash commands with disable-model-invocation in frontmatter

Bug Description
Haiku 4.5 gets confused by custom slash commands that use disable-model-invocation: true in their frontmatter.

1. The preamble sent to Claude when I ran /show-tools is:

<command-message>show-tools is running…</command-message>
<command-name>/show-tools</command-name># Show All Tools

...(rest of slash command prompt contents)

1. This conflicts with the SlashCommand tool description as the tool is not listed. This resulted in Haiku 4.5 responding with:

I appreciate you running the /show-tools command, but I'm not able to execute that command. It appears to be a custom slash command that isn't available in this Claude Code session.

Environment Info

• Platform: linux
• Terminal: vscode
• Version: 2.0.19
• Feedback ID: 6f2ea13b-0229-4992-be88-57515d525014

Errors

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