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Python

"""examples/snippets/clients/parsing_tool_results.py"""
import asyncio
import mcp_types as types
from mcp import ClientSession, StdioServerParameters
from mcp.client.stdio import stdio_client
async def parse_tool_results():
"""Demonstrates how to parse different types of content in CallToolResult."""
server_params = StdioServerParameters(command="python", args=["path/to/mcp_server.py"])
async with stdio_client(server_params) as (read, write):
async with ClientSession(read, write) as session:
await session.initialize()
# Example 1: Parsing text content
result = await session.call_tool("get_data", {"format": "text"})
for content in result.content:
if isinstance(content, types.TextContent):
print(f"Text: {content.text}")
# Example 2: Parsing structured content from JSON tools
result = await session.call_tool("get_user", {"id": "123"})
if hasattr(result, "structured_content") and result.structured_content:
# Access structured data directly
user_data = result.structured_content
print(f"User: {user_data.get('name')}, Age: {user_data.get('age')}")
# Example 3: Parsing embedded resources
result = await session.call_tool("read_config", {})
for content in result.content:
if isinstance(content, types.EmbeddedResource):
resource = content.resource
if isinstance(resource, types.TextResourceContents):
print(f"Config from {resource.uri}: {resource.text}")
else:
print(f"Binary data from {resource.uri}")
# Example 4: Parsing image content
result = await session.call_tool("generate_chart", {"data": [1, 2, 3]})
for content in result.content:
if isinstance(content, types.ImageContent):
print(f"Image ({content.mime_type}): {len(content.data)} bytes")
# Example 5: Handling errors
result = await session.call_tool("failing_tool", {})
if result.is_error:
print("Tool execution failed!")
for content in result.content:
if isinstance(content, types.TextContent):
print(f"Error: {content.text}")
async def main():
await parse_tool_results()
if __name__ == "__main__":
asyncio.run(main())