Struct Tool 

pub struct Tool {
    pub name: String,
    pub title: Option<String>,
    pub description: Option<String>,
    pub input_schema: ToolInputSchema,
    pub output_schema: Option<ToolOutputSchema>,
    pub annotations: Option<ToolAnnotations>,
    pub meta: Option<HashMap<String, Value>>,
}

Tool definition per MCP 2025-06-18 specification

Fields

name: String

Tool name (programmatic identifier)

title: Option<String>

Display title for UI contexts (optional, falls back to name if not provided)

description: Option<String>

Human-readable description of the tool This can be used by clients to improve the LLM’s understanding of available tools

input_schema: ToolInputSchema

JSON Schema object defining the expected parameters for the tool

output_schema: Option<ToolOutputSchema>

Optional JSON Schema object defining the structure of the tool’s output returned in the structuredContent field of a CallToolResult

annotations: Option<ToolAnnotations>

Optional additional tool information Display name precedence order is: title, annotations.title, then name

meta: Option<HashMap<String, Value>>

General metadata field for extensions and custom data

Trait Implementations

impl Clone for Tool

fn clone(&self) -> Tool

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Tool

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Tool

fn deserialize<__D>( __deserializer: __D, ) -> Result<Tool, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Tool

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.