Trait Tool 

pub trait Tool: Send + Sync {
    // Required methods
    fn name(&self) -> &'static str;
    fn description(&self) -> &'static str;
    fn input_schema(&self) -> Value;
    fn call<'life0, 'async_trait>(
        &'life0 self,
        input: ToolInput,
    ) -> Pin<Box<dyn Future<Output = ToolOutput> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait;
}

A registered MCP tool. Implementations describe themselves (name, description, schema) and implement the async call method that produces an output for the given input.

Required Methods

fn name(&self) -> &'static str

Tool name. Exposed to the model as mcp__<server>__<tool>.

'static rather than borrowed from &self: a tool’s identity is fixed at compile time, and eliding the lifetime here made every impl in the tree trip clippy::unnecessary_literal_bound.

fn description(&self) -> &'static str

One-line description.

fn input_schema(&self) -> Value

JSON Schema describing the tool’s arguments.

fn call<'life0, 'async_trait>( &'life0 self, input: ToolInput, ) -> Pin<Box<dyn Future<Output = ToolOutput> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Execute the tool.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors