Typespec Api Operations

# Add TypeSpec API Operations

Add RESTful operations to an existing TypeSpec API plugin for Microsoft 365 Copilot.

## Adding GET Operations

### Simple GET - List All Items
```typescript
/**
 * List all items.
 */
@route("/items")
@get op listItems(): Item[];
```

### GET with Query Parameter - Filter Results
```typescript
/**
 * List items filtered by criteria.
 * @param userId Optional user ID to filter items
 */
@route("/items")
@get op listItems(@query userId?: integer): Item[];
```

### GET with Path Parameter - Get Single Item
```typescript
/**
 * Get a specific item by ID.
 * @param id The ID of the item to retrieve
 */
@route("/items/{id}")
@get op getItem(@path id: integer): Item;
```

### GET with Adaptive Card
```typescript
/**
 * List items with adaptive card visualization.
 */
@route("/items")
@card(#{
  dataPath: "$",
  title: "$.title",
  file: "item-card.json"
})
@get op listItems(): Item[];
```

**Create the Adaptive Card** (`appPackage/item-card.json`):
```json
{
  "type": "AdaptiveCard",
  "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
  "version": "1.5",
  "body": [
    {
      "type": "Container",
      "$data": "${$root}",
      "items": [
        {
          "type": "TextBlock",
          "text": "**${if(title, title, 'N/A')}**",
          "wrap": true
        },
        {
          "type": "TextBlock",
          "text": "${if(description, description, 'N/A')}",
          "wrap": true
        }
      ]
    }
  ],
  "actions": [
    {
      "type": "Action.OpenUrl",
      "title": "View Details",
      "url": "https://example.com/items/${id}"
    }
  ]
}
```

## Adding POST Operations

### Simple POST - Create Item
```typescript
/**
 * Create a new item.
 * @param item The item to create
 */
@route("/items")
@post op createItem(@body item: CreateItemRequest): Item;

model CreateItemRequest {
  title: string;
  description?: string;
  userId: integer;
}
```

### POST with Confirmation
```typescript
/**
 * Create a new item with confirmation.
 */
@route("/items")
@post
@capabilities(#{
  confirmation: #{
    type: "AdaptiveCard",
    title: "Create Item",
    body: """
    Are you sure you want to create this item?
      * **Title**: {{ function.parameters.item.title }}
      * **User ID**: {{ function.parameters.item.userId }}
    """
  }
})
op createItem(@body item: CreateItemRequest): Item;
```

## Adding PATCH Operations

### Simple PATCH - Update Item
```typescript
/**
 * Update an existing item.
 * @param id The ID of the item to update
 * @param item The updated item data
 */
@route("/items/{id}")
@patch op updateItem(
  @path id: integer,
  @body item: UpdateItemRequest
): Item;

model UpdateItemRequest {
  title?: string;
  description?: string;
  status?: "active" | "completed" | "archived";
}
```

### PATCH with Confirmation
```typescript
/**
 * Update an item with confirmation.
 */
@route("/items/{id}")
@patch
@capabilities(#{
  confirmation: #{
    type: "AdaptiveCard",
    title: "Update Item",
    body: """
    Updating item #{{ function.parameters.id }}:
      * **Title**: {{ function.parameters.item.title }}
      * **Status**: {{ function.parameters.item.status }}
    """
  }
})
op updateItem(
  @path id: integer,
  @body item: UpdateItemRequest
): Item;
```

## Adding DELETE Operations

### Simple DELETE
```typescript
/**
 * Delete an item.
 * @param id The ID of the item to delete
 */
@route("/items/{id}")
@delete op deleteItem(@path id: integer): void;
```

### DELETE with Confirmation
```typescript
/**
 * Delete an item with confirmation.
 */
@route("/items/{id}")
@delete
@capabilities(#{
  confirmation: #{
    type: "AdaptiveCard",
    title: "Delete Item",
    body: """
    ⚠️ Are you sure you want to delete item #{{ function.parameters.id }}?
    This action cannot be undone.
    """
  }
})