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feat: Add tool annotations for improved LLM tool understanding (#110)

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Add readOnlyHint and destructiveHint annotations to all 25 tools
to help LLMs better understand tool behavior and make safer decisions.

Changes:
- Added readOnlyHint: true to 6 read-only tools (validate_formula_syntax,
  read_data_from_excel, get_workbook_metadata, get_merged_cells,
  validate_excel_range, get_data_validation_info)
- Added destructiveHint: true to 19 tools that modify data
- Added title annotations for human-readable display

This improves tool safety metadata for MCP clients.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: triepod-ai <noreply@github.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Bryan Thompson
2025-12-22 04:03:22 -06:00
committed by GitHub
parent f0c0ecdcd7
commit e50532296b
1 changed files with 151 additions and 25 deletions
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176
src/excel_mcp/server.py
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@ -3,6 +3,7 @@ import os
from typing import Any, List, Dict, Optional
from mcp.server.fastmcp import FastMCP
from mcp.types import ToolAnnotations
# Import exceptions
from excel_mcp.exceptions import (
@ -92,7 +93,12 @@ def get_excel_path(filename: str) -> str:
# In SSE mode, if it's a relative path, resolve it based on EXCEL_FILES_PATH
return os.path.join(EXCEL_FILES_PATH, filename)
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Apply Formula",
destructiveHint=True,
),
)
def apply_formula(
filepath: str,
sheet_name: str,
@ -120,7 +126,12 @@ def apply_formula(
logger.error(f"Error applying formula: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Validate Formula Syntax",
readOnlyHint=True,
),
)
def validate_formula_syntax(
filepath: str,
sheet_name: str,
@ -138,7 +149,12 @@ def validate_formula_syntax(
logger.error(f"Error validating formula: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Format Range",
destructiveHint=True,
),
)
def format_range(
filepath: str,
sheet_name: str,
@ -192,7 +208,12 @@ def format_range(
logger.error(f"Error formatting range: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Read Data from Excel",
readOnlyHint=True,
),
)
def read_data_from_excel(
filepath: str,
sheet_name: str,
@ -234,7 +255,12 @@ def read_data_from_excel(
logger.error(f"Error reading data: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Write Data to Excel",
destructiveHint=True,
),
)
def write_data_to_excel(
filepath: str,
sheet_name: str,
@ -262,7 +288,12 @@ def write_data_to_excel(
logger.error(f"Error writing data: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Create Workbook",
destructiveHint=True,
),
)
def create_workbook(filepath: str) -> str:
"""Create new Excel workbook."""
try:
@ -276,7 +307,12 @@ def create_workbook(filepath: str) -> str:
logger.error(f"Error creating workbook: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Create Worksheet",
destructiveHint=True,
),
)
def create_worksheet(filepath: str, sheet_name: str) -> str:
"""Create new worksheet in workbook."""
try:
@ -290,7 +326,12 @@ def create_worksheet(filepath: str, sheet_name: str) -> str:
logger.error(f"Error creating worksheet: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Create Chart",
destructiveHint=True,
),
)
def create_chart(
filepath: str,
sheet_name: str,
@ -321,7 +362,12 @@ def create_chart(
logger.error(f"Error creating chart: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Create Pivot Table",
destructiveHint=True,
),
)
def create_pivot_table(
filepath: str,
sheet_name: str,
@ -350,7 +396,12 @@ def create_pivot_table(
logger.error(f"Error creating pivot table: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Create Table",
destructiveHint=True,
),
)
def create_table(
filepath: str,
sheet_name: str,
@ -375,7 +426,12 @@ def create_table(
logger.error(f"Error creating table: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Copy Worksheet",
destructiveHint=True,
),
)
def copy_worksheet(
filepath: str,
source_sheet: str,
@ -392,7 +448,12 @@ def copy_worksheet(
logger.error(f"Error copying worksheet: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Delete Worksheet",
destructiveHint=True,
),
)
def delete_worksheet(
filepath: str,
sheet_name: str
@ -408,7 +469,12 @@ def delete_worksheet(
logger.error(f"Error deleting worksheet: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Rename Worksheet",
destructiveHint=True,
),
)
def rename_worksheet(
filepath: str,
old_name: str,
@ -425,7 +491,12 @@ def rename_worksheet(
logger.error(f"Error renaming worksheet: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Get Workbook Metadata",
readOnlyHint=True,
),
)
def get_workbook_metadata(
filepath: str,
include_ranges: bool = False
@ -441,7 +512,12 @@ def get_workbook_metadata(
logger.error(f"Error getting workbook metadata: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Merge Cells",
destructiveHint=True,
),
)
def merge_cells(filepath: str, sheet_name: str, start_cell: str, end_cell: str) -> str:
"""Merge a range of cells."""
try:
@ -454,7 +530,12 @@ def merge_cells(filepath: str, sheet_name: str, start_cell: str, end_cell: str)
logger.error(f"Error merging cells: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Unmerge Cells",
destructiveHint=True,
),
)
def unmerge_cells(filepath: str, sheet_name: str, start_cell: str, end_cell: str) -> str:
"""Unmerge a range of cells."""
try:
@ -467,7 +548,12 @@ def unmerge_cells(filepath: str, sheet_name: str, start_cell: str, end_cell: str
logger.error(f"Error unmerging cells: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Get Merged Cells",
readOnlyHint=True,
),
)
def get_merged_cells(filepath: str, sheet_name: str) -> str:
"""Get merged cells in a worksheet."""
try:
@ -479,7 +565,12 @@ def get_merged_cells(filepath: str, sheet_name: str) -> str:
logger.error(f"Error getting merged cells: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Copy Range",
destructiveHint=True,
),
)
def copy_range(
filepath: str,
sheet_name: str,
@ -507,7 +598,12 @@ def copy_range(
logger.error(f"Error copying range: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Delete Range",
destructiveHint=True,
),
)
def delete_range(
filepath: str,
sheet_name: str,
@ -533,7 +629,12 @@ def delete_range(
logger.error(f"Error deleting range: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Validate Excel Range",
readOnlyHint=True,
),
)
def validate_excel_range(
filepath: str,
sheet_name: str,
@ -552,7 +653,12 @@ def validate_excel_range(
logger.error(f"Error validating range: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Get Data Validation Info",
readOnlyHint=True,
),
)
def get_data_validation_info(
filepath: str,
sheet_name: str
@ -596,7 +702,12 @@ def get_data_validation_info(
logger.error(f"Error getting validation info: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Insert Rows",
destructiveHint=True,
),
)
def insert_rows(
filepath: str,
sheet_name: str,
@ -614,7 +725,12 @@ def insert_rows(
logger.error(f"Error inserting rows: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Insert Columns",
destructiveHint=True,
),
)
def insert_columns(
filepath: str,
sheet_name: str,
@ -632,7 +748,12 @@ def insert_columns(
logger.error(f"Error inserting columns: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Delete Rows",
destructiveHint=True,
),
)
def delete_sheet_rows(
filepath: str,
sheet_name: str,
@ -650,7 +771,12 @@ def delete_sheet_rows(
logger.error(f"Error deleting rows: {e}")
raise
@mcp.tool()
@mcp.tool(
annotations=ToolAnnotations(
title="Delete Columns",
destructiveHint=True,
),
)
def delete_sheet_columns(
filepath: str,
sheet_name: str,