Struct ToolOutputSchema 

pub struct ToolOutputSchema {
    pub additional: HashMap<String, Value>,
}

Core MCP protocol types and error handling JSON Schema for Tool.outputSchema per 2026-07-28:

outputSchema?: { $schema?: string; [key: string]: unknown }

Unlike ToolSchema (inputSchema), outputSchema has no root type constraint — it may describe any JSON value (object, array, string, number, boolean, null). Use Self::any for an empty/unrestricted schema, or attach arbitrary 2020-12 keywords via additional.

Fields

additional: HashMap<String, Value>

All schema fields (no required type field — output may be any JSON per schema). Use this for $schema, type (if you want object root), oneOf, anyOf, $ref, $defs, etc.

Implementations

impl ToolOutputSchema

pub fn any() -> ToolOutputSchema

Empty schema — accepts any JSON value as output.

pub fn with( self, key: impl Into<String>, value: impl Into<Value>, ) -> ToolOutputSchema

Attach an arbitrary 2020-12 keyword.

Trait Implementations

impl Clone for ToolOutputSchema

fn clone(&self) -> ToolOutputSchema

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ToolOutputSchema

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

Formats the value using the given formatter.

impl Default for ToolOutputSchema

fn default() -> ToolOutputSchema

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ToolOutputSchema

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ToolOutputSchema

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.