# Model Selection & Display

## Summary

Add model visibility and control to the AMC dashboard. Users can see which model each agent is running, pick a model when spawning, and switch models mid-session.

## Models

| Label | Value sent to Claude Code |
|-------|--------------------------|
| Opus 4.6 | `opus` |
| Opus 4.5 | `claude-opus-4-5-20251101` |
| Sonnet 4.6 | `sonnet` |
| Haiku | `haiku` |

## Step 1: Display Current Model

Surface `context_usage.model` in `SessionCard.js`.

- Data already extracted by `parsing.py` (line 202) from conversation JSONL
- Already available via `/api/state` in `context_usage.model`
- Add model name formatter: `claude-opus-4-5-20251101` -> `Opus 4.5`
- Show in SessionCard (near agent badge or context usage area)
- Shows `null` until first assistant message

**Files**: `dashboard/components/SessionCard.js`

## Step 2: Model Picker at Spawn

Add model dropdown to `SpawnModal.js`. Pass to spawn API, which appends `--model <value>` to the claude command.

- Extend `/api/spawn` to accept optional `model` param
- Validate against allowed model list
- Prepend `--model {model}` to command in `AGENT_COMMANDS`
- Default: no flag (uses Claude Code's default)

**Files**: `dashboard/components/SpawnModal.js`, `amc_server/mixins/spawn.py`

## Step 3: Mid-Session Model Switch

Dropdown on SessionCard to change model for running sessions via Zellij.

- Send `/model <value>` to the agent's Zellij pane:
  ```bash
  zellij -s {session} action write-chars "/model {value}" --pane-id {pane}
  zellij -s {session} action write 10 --pane-id {pane}
  ```
- New endpoint: `POST /api/session/{id}/model` with `{"model": "opus"}`
- Only works when agent is idle (waiting for input). If mid-turn, command queues and applies after.

**Files**: `dashboard/components/SessionCard.js`, `amc_server/mixins/state.py` (or new mixin)