Contrib Anthropic use tool not working

What happened:

1. Serialization error
   It uses a function rather than a method.

2. Custom tool didn't execute
   The condition role = tool will never be met

Environment:

• Blades version: v0.3.1
• Go version (use go version): 1.25.4
• OS (e.g: cat /etc/os-release): macos
• Others: