Docs: Update CallToolResult parsing in README

The example in README.md for parsing the result of `session.call_tool`
has been updated to reflect the structure of `CallToolResult`.

This change aligns the README example with the type definitions in
`mcp/types.py`.

Author: functicons

README.md

@@ -779,6 +779,22 @@ async def run():
 
             # Call a tool
             result = await session.call_tool("tool-name", arguments={"arg1": "value"})
+            # Parse the result (type: CallToolResult)
+            for item in result.content:
+                if isinstance(item, types.TextContent):
+                    # Extract text directly from TextContent
+                    print(f"Tool output (TextContent): {item.text}")
+                elif isinstance(item, types.EmbeddedResource):
+                    # Check if the embedded resource contains text
+                    if isinstance(item.resource, types.TextResourceContents):
+                        print(f"Tool output (EmbeddedResource - Text): {item.resource.text}")
+                    elif isinstance(item.resource, types.BlobResourceContents):
+                        print(f"Tool output (EmbeddedResource - Blob): URI {item.resource.uri}, MIME Type {item.resource.mimeType}")
+                elif isinstance(item, types.ImageContent):
+                    # Showing only a snippet of image data
+                    print(f"Tool output (ImageContent): MIME Type {item.mimeType}, Data (base64): {item.data[:30]}...")
+                else:
+                    print(f"Tool output (Unknown Content Type): {type(item)}")
 
 
 if __name__ == "__main__":
@@ -807,6 +823,22 @@ async def main():
             await session.initialize()
             # Call a tool
             tool_result = await session.call_tool("echo", {"message": "hello"})
+            # Parse the result (type: CallToolResult)
+            for item in tool_result.content:
+                if isinstance(item, types.TextContent):
+                    # Extract text directly from TextContent
+                    print(f"Tool output (TextContent): {item.text}")
+                elif isinstance(item, types.EmbeddedResource):
+                    # Check if the embedded resource contains text
+                    if isinstance(item.resource, types.TextResourceContents):
+                        print(f"Tool output (EmbeddedResource - Text): {item.resource.text}")
+                    elif isinstance(item.resource, types.BlobResourceContents):
+                        print(f"Tool output (EmbeddedResource - Blob): URI {item.resource.uri}, MIME Type {item.resource.mimeType}")
+                elif isinstance(item, types.ImageContent):
+                    # Showing only a snippet of image data
+                    print(f"Tool output (ImageContent): MIME Type {item.mimeType}, Data (base64): {item.data[:30]}...")
+                else:
+                    print(f"Tool output (Unknown Content Type): {type(item)}")
 ```
 
 ### OAuth Authentication for Clients