Type Alias InitFn 

pub type InitFn = unsafe extern "C" fn(error_msg_ptr: *mut *mut u8, error_msg_len: *mut usize) -> i32;

Function signature for plugin initialization

Called by the framework at the end of handle_initialize, after:

• Plugin library is loaded
• Configuration is set (via configure function if present)
• But before any tools are registered or called

The plugin should use this to:

• Validate configuration
• Initialize resources (database connections, caches, etc.)
• Perform any expensive setup operations
• Report initialization errors

Parameters

• error_msg_ptr: Output pointer for error message (on failure)
• error_msg_len: Output length of error message (on failure)

Returns

• 0 on success
• Non-zero error code on failure

If initialization fails, the plugin should allocate an error message, write the pointer and length to the output parameters, and return non-zero. The framework will call free_string to deallocate the error message.