Struct Tool 

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

Core MCP protocol types, errors, and specification compliance Tool definition

Fields

name: String

The tool’s name - used as identifier when calling

title: Option<String>

Intended for UI and end-user contexts — optimized to be human-readable and easily understood, even by those unfamiliar with domain-specific terminology.

description: Option<String>

Optional human-readable description

input_schema: ToolSchema

JSON Schema for input parameters

output_schema: Option<ToolSchema>

Optional JSON Schema for output results

annotations: Option<ToolAnnotations>

Optional annotations for client hints

meta: Option<HashMap<String, Value>>

Implementations

impl Tool

pub fn new(name: impl Into<String>, input_schema: ToolSchema) -> Tool

pub fn with_title(self, title: impl Into<String>) -> Tool

pub fn with_description(self, description: impl Into<String>) -> Tool

pub fn with_output_schema(self, output_schema: ToolSchema) -> Tool

pub fn with_annotations(self, annotations: ToolAnnotations) -> Tool

pub fn with_meta(self, meta: HashMap<String, Value>) -> Tool

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 HasAnnotations for Tool

fn annotations(&self) -> Option<&ToolAnnotations>

impl HasBaseMetadata for Tool

fn name(&self) -> &str

Programmatic identifier (fallback display name)

fn title(&self) -> Option<&str>

Human-readable display name (UI contexts)

impl HasDescription for Tool

fn description(&self) -> Option<&str>

impl HasInputSchema for Tool

fn input_schema(&self) -> &ToolSchema

impl HasOutputSchema for Tool

fn output_schema(&self) -> Option<&ToolSchema>

impl HasToolMeta for Tool

fn tool_meta(&self) -> Option<&HashMap<String, Value>>

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.