Struct Tool 

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

Tool definition with annotations and title (2025-11-25)

Fields

name: String

Intended for programmatic or logical use

description: Option<String>

Description of what the tool does

input_schema: ToolInputSchema

JSON Schema describing the tool’s input parameters

output_schema: Option<ToolOutputSchema>

Optional JSON Schema object defining the structure of the tool’s output returned in the structuredContent field of a CallToolResult (2025-11-25 NEW)

annotations: Option<ToolAnnotations>

Tool behavior annotations (2025-11-25)

title: Option<String>

Intended for UI and end-user contexts

icons: Option<Vec<Icon>>

Optional icons for UI rendering.

meta: Option<HashMap<String, Value>>

Metadata field for future extensions

Implementations

impl Tool

pub fn new<S: Into<String>>(name: S, description: S) -> Self

Create a new tool

pub fn with_title<S: Into<String>>(self, title: S) -> Self

Add title to the tool

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

Add annotations to the tool

pub fn with_output_schema(self, output_schema: ToolOutputSchema) -> Self

Add output schema to the tool (2025-11-25 NEW)

pub fn with_icons(self, icons: Vec<Icon>) -> Self

Add icons to the tool metadata.

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

Formats the value using the given formatter.

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

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Tool

fn eq(&self, other: &Tool) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Tool

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Tool