Macro tool 

macro_rules! tool {
    (
        name: $name:literal,
        description: $desc:literal,
        schema: $schema:expr,
        call: |$input:ident : $input_ty:ty| async move $body:block,
        tool_type: $ty:ident $(,)?
    ) => { ... };
}

Declarative tool-trait impl.

Example

use forge_sdk::tool;
use forge_sdk::mcp::{ToolInput, ToolOutput};
use serde_json::json;

tool! {
    name: "greet",
    description: "Greet by name",
    schema: json!({"type": "object", "properties": {"name": {"type": "string"}}, "required": ["name"]}),
    call: |input: ToolInput| async move {
        let name = input.value["name"].as_str().unwrap_or("stranger");
        ToolOutput::text(format!("hello {name}"))
    },
    tool_type: GreetTool,
}