Function prepare_tools 

pub fn prepare_tools(tools: Vec<Arc<dyn BaseTool>>) -> PreparedTools

Prepare tools for use in a graph.

Takes a list of tools and returns everything needed:

• tool_defs: for model.bind_tools()
• by_name: for looking up tools by name when executing calls
• tools: original list for ToolNode or other uses

Example

use langgraph_prebuilt::prepare_tools;

let prepared = prepare_tools(vec![
    Arc::new(Multiply::new()),
    Arc::new(Add::new()),
]);

let model = model.bind_tools(prepared.tool_defs);
// Use prepared.by_name in tool_node closure