Add worksheet selection to excel-to-markdown skill

Add --sheet parameter to specify worksheets by name or index (1-based). Change default behavior to use first worksheet instead of active sheet, with proper error messages for invalid worksheet references.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

skills/excel-to-markdown/SKILL.md

@@ -19,6 +19,18 @@ Convert an entire Excel file to Markdown:
 python3 scripts/excel_to_markdown.py input.xlsx -o output.md
 ```
 
+### Specify Worksheet
+
+Convert a specific worksheet by name or index:
+
+```bash
+# By worksheet name
+python3 scripts/excel_to_markdown.py input.xlsx -o output.md --sheet "Sheet2"
+
+# By worksheet index (1-based)
+python3 scripts/excel_to_markdown.py input.xlsx -o output.md --sheet 2
+```
+
 ### Convert with Row/Column Numbers
 
 Display Excel row and column identifiers for reference:
@@ -51,6 +63,7 @@ python3 scripts/excel_to_markdown.py input.xlsx -o output.md --start-row 2 --sta
 | `--show-cols` | Display column letters (A, B, C...) in the first row |
 | `--start-row` | Starting row number (default: 1) |
 | `--start-col` | Starting column number (default: 1) |
+| `--sheet` | Worksheet name or index (default: first worksheet) |
 
 ## Features
 
@@ -67,7 +80,12 @@ The converter automatically scans the spreadsheet to identify the actual data ra
 
 ### Multi-Sheet Support
 
-By default, the converter processes the active (last selected) sheet in the workbook.
+By default, the converter processes the first worksheet in the workbook. You can specify a different worksheet using the `--sheet` parameter:
+
+- **By name**: `--sheet "Sheet2"` or `--sheet "Data"`
+- **By index**: `--sheet 2` (1-based indexing)
+
+If the specified worksheet is not found, an error will display the list of available worksheets.
 
 ## Common Use Cases
 

skills/excel-to-markdown/scripts/excel_to_markdown.py

@@ -14,15 +14,34 @@ import argparse
 class ExcelToMarkdown:
     """Excel转Markdown转换器"""
     
-    def __init__(self, excel_file: str):
+    def __init__(self, excel_file: str, sheet_name: Optional[str] = None):
         """
         初始化转换器
 
         Args:
             excel_file: Excel文件路径
+            sheet_name: 工作表名称或索引（None表示使用第一个工作表）
         """
         self.workbook = openpyxl.load_workbook(excel_file, data_only=True)
-        self.sheet = self.workbook.active
+
+        # 获取指定的工作表
+        if sheet_name is None:
+            # 使用第一个工作表
+            self.sheet = self.workbook.worksheets[0]
+        elif isinstance(sheet_name, int) or sheet_name.isdigit():
+            # 按索引获取（从1开始）
+            sheet_index = int(sheet_name) - 1
+            if 0 <= sheet_index < len(self.workbook.worksheets):
+                self.sheet = self.workbook.worksheets[sheet_index]
+            else:
+                raise ValueError(f"工作表索引 {sheet_name} 超出范围（1-{len(self.workbook.worksheets)}）")
+        else:
+            # 按名称获取
+            if sheet_name in self.workbook.sheetnames:
+                self.sheet = self.workbook[sheet_name]
+            else:
+                available_sheets = ", ".join(self.workbook.sheetnames)
+                raise ValueError(f"找不到工作表 '{sheet_name}'，可用的工作表: {available_sheets}")
     
     def detect_data_range(self, max_scan_rows: int = 100, max_scan_cols: int = 100) -> Tuple[int, int]:
         """
@@ -172,6 +191,12 @@ def main():
 
   # 从第2行第2列开始，转换5行3列
   python excel_to_markdown.py input.xlsx -o output.md -r 5 -c 3 --start-row 2 --start-col 2
+
+  # 指定工作表（按名称）
+  python excel_to_markdown.py input.xlsx -o output.md --sheet "Sheet2"
+
+  # 指定工作表（按索引）
+  python excel_to_markdown.py input.xlsx -o output.md --sheet 2
         """
     )
 
@@ -183,12 +208,13 @@ def main():
     parser.add_argument('--show-cols', action='store_true', help='显示列号（字母形式）')
     parser.add_argument('--start-row', type=int, default=1, help='起始行号（默认1）')
     parser.add_argument('--start-col', type=int, default=1, help='起始列号（默认1）')
+    parser.add_argument('--sheet', help='工作表名称或索引（不指定则使用第一个工作表）')
     
     args = parser.parse_args()
     
     try:
         # 创建转换器
-        converter = ExcelToMarkdown(args.input_file)
+        converter = ExcelToMarkdown(args.input_file, args.sheet)
         
         # 执行转换
         markdown_text = converter.convert(