/setup

Step 0: Parse --model parameter

Check if $ARGUMENTS contains --model <value>:

• If yes: extract the value as MODEL, remove --model <value> from $ARGUMENTS
• If no: set MODEL = flash

Run the following checks in order and report the results:

1. Check if Gemini CLI is installed

Run: which gemini || where gemini 2>/dev/null

• If found: report the path
• If not found: tell the user to install it with npm install -g @google/gemini-cli or visit https://github.com/google-gemini/gemini-cli

2. Check Gemini CLI version

Run: gemini --version

• Report the version number

3. Check authentication

Run: test -f ~/.gemini/oauth_creds.json && echo "OAuth credentials found" || echo "OAuth credentials not found"

• If found: confirm Google OAuth is configured
• If not found: tell the user to run gemini interactively to authenticate via Google OAuth

4. Test model availability

Run: echo "ping" | gemini -m $MODEL

• If the command succeeds: report that the model is available
• If the command fails with a model error: report the error and suggest trying a different model

Summary

After all checks, provide a one-line summary:

• All checks passed: "Gemini CLI is ready to use with model $MODEL. Try /gemini:review"
• Something missing: list what needs to be fixed