1. Validate argument

if $ARGUMENTS.profile not in ["quality", "balanced", "budget"]:
  Error: Invalid profile "$ARGUMENTS.profile"
  Valid profiles: quality, balanced, budget
  STOP

2. Check for project

ls .planning/config.json 2>/dev/null

If no .planning/ directory:

Error: No Kata project found.
Run /kata-new-project first to initialize a project.

3. Update config.json

Read current config:

cat .planning/config.json

Update model_profile field (or add if missing):

{
  "model_profile": "$ARGUMENTS.profile"
}

Write updated config back to .planning/config.json.

4. Confirm

✓ Model profile set to: $ARGUMENTS.profile

Agents will now use:
[Show table from model-profiles.md for selected profile]

Next spawned agents will use the new profile.

Switch to budget mode:

/kata-set-profile budget

✓ Model profile set to: budget

Agents will now use:
| Agent         | Model  |
| ------------- | ------ |
| kata-planner  | sonnet |
| kata-executor | sonnet |
| kata-verifier | haiku  |
| ...           | ...    |

Switch to quality mode:

/kata-set-profile quality

✓ Model profile set to: quality

Agents will now use:
| Agent         | Model  |
| ------------- | ------ |
| kata-planner  | opus   |
| kata-executor | opus   |
| kata-verifier | sonnet |
| ...           | ...    |