# Trello Plugin — Manage Trello Lists

**Feature:** US: Manage Trello Lists
**Issue:** #3
**Branch:** `feature/manage-lists`
**Doc:** 003

## Overview

Extends the Trello plugin with list management capabilities: create, rename, archive, and reposition lists on a Trello board.

## Design Decisions

- **Lists require a board context** — Creating a list needs a board ID. Other operations (rename, archive, move) use the list's Trello ID which is globally unique.
- **Position parameter** — Uses Trello's `pos` field which accepts `"top"`, `"bottom"`, or a positive number.

## Tools

### `trello_create_list`

Create a new list on a board.

**Parameters:**
| Param | Type | Required | Description |
|-------|------|----------|-------------|
| `name` | string | Yes | List name |
| `board_id` | string | Yes | Board ID or name |
| `pos` | string | No | Position: `"top"`, `"bottom"`, or number (default: `"bottom"`) |

**Returns:**
```json
{"success": true, "list": {"id": "l1", "name": "My List", "id_board": "b1"}}
```

### `trello_rename_list`

Rename an existing list.

**Parameters:**
| Param | Type | Required | Description |
|-------|------|----------|-------------|
| `list_id` | string | Yes | List ID |
| `name` | string | Yes | New name |

**Returns:**
```json
{"success": true, "list": {"id": "l1", "name": "Renamed List"}}
```

### `trello_archive_list`

Archive a list.

**Parameters:**
| Param | Type | Required | Description |
|-------|------|----------|-------------|
| `list_id` | string | Yes | List ID |

**Returns:**
```json
{"success": true, "message": "List 'My List' archived."}
```

### `trello_move_list`

Move a list to a different position.

**Parameters:**
| Param | Type | Required | Description |
|-------|------|----------|-------------|
| `list_id` | string | Yes | List ID |
| `pos` | string | Yes | Position: `"top"`, `"bottom"`, or a number |

**Returns:**
```json
{"success": true, "message": "List 'My List' moved."}
```

## Trello API Endpoints

| Purpose | Method | Endpoint |
|---------|--------|----------|
| Create list | POST | `/1/lists` |
| Update list (rename, archive, move) | PUT | `/1/lists/{id}` |

## Error Handling

- List not found → clear error message
- Board not found when creating → propagate board lookup error