Struct ToolInputSchema 

pub struct ToolInputSchema {
    pub schema: Option<String>,
    pub extra: Option<Map<String, Value>>,
    /* private fields */
}

Latest MCP Protocol 2026_07_28 A JSON Schema object defining the expected parameters for the tool. Tool arguments are always JSON objects, so type: “object” is required at the root. Beyond that, any JSON Schema 2020-12 keyword may appear alongside type — including composition keywords (oneOf, anyOf, allOf, not), conditional keywords (if/then/else), reference keywords ($ref, $defs, $anchor), and any other standard validation or annotation keywords. Property schemas may carry an x-mcp-header annotation to mirror the argument value into an HTTP header on the Streamable HTTP transport. See the Streamable HTTP transport specification for the validity and extraction rules. Defaults to JSON Schema 2020-12 when no explicit $schema is provided.

JSON schema

{
 "description": "A JSON Schema object defining the expected parameters for the tool.\n\nTool arguments are always JSON objects, so type: \"object\" is required at the root.\nBeyond that, any JSON Schema 2020-12 keyword may appear alongside type — including\ncomposition keywords (oneOf, anyOf, allOf, not), conditional keywords\n(if/then/else), reference keywords ($ref, $defs, $anchor), and any other\nstandard validation or annotation keywords.\n\nProperty schemas may carry an x-mcp-header annotation to mirror the\nargument value into an HTTP header on the Streamable HTTP transport. See\nthe Streamable HTTP transport specification for the validity and\nextraction rules.\n\nDefaults to JSON Schema 2020-12 when no explicit $schema is provided.",
 "type": "object",
 "required": [
   "type"
 ],
 "properties": {
   "$schema": {
     "type": "string"
   },
   "type": {
     "type": "string",
     "const": "object"
   }
 },
 "additionalProperties": {}
}

Fields

schema: Option<String>

extra: Option<Map<String, Value>>

Implementations

impl ToolInputSchema

pub fn new(schema: Option<String>, extra: Option<Map<String, Value>>) -> Self

pub fn type_(&self) -> &String

pub fn type_value() -> &'static str

returns “object”

pub fn type_name() -> &'static str

👎Deprecated since 0.8.0:

Use type_value() instead.

Trait Implementations

impl Clone for ToolInputSchema

fn clone(&self) -> ToolInputSchema

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ToolInputSchema

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ToolInputSchema

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ToolInputSchema

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

where __S: Serializer,

Serialize this value into the given Serde serializer.