[BUG] Claude code fails when I set a model to use for custom commands

Environment

• Platform (select one):
• [ ] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: Claude Code
• Claude CLI version: 1.0.72 (Claude Code)-->
• Operating System: Arch Linux
• Terminal: Kitty

Bug Description

I defined a new command and set the model in front matter to sonnet following the instruction from https://docs.anthropic.com/en/docs/claude-code/slash-commands

The command returns an invalid model name error:
API Error: 404 {"type":"error","error":{"type":"not_found_error","message":"model:
Sonnet"}}

Expected Behavior

To use sonnet for this command

Actual Behavior

Return API Error: 404 {"type":"error","error":{"type":"not_found_error","message":"model:
Sonnet"}}
And the task fails