Struct Json 

pub struct Json<T>(pub T);

Extract and deserialize JSON arguments into a typed struct.

This extractor deserializes the tool’s JSON arguments into type T. The type must implement serde::de::DeserializeOwned and schemars::JsonSchema.

Example

use tower_mcp::extract::Json;
use schemars::JsonSchema;
use serde::Deserialize;

#[derive(Debug, Deserialize, JsonSchema)]
struct MyInput {
    name: String,
    count: i32,
}

// In an extractor handler:
// |Json(input): Json<MyInput>| async move { ... }

Rejection

Returns a JsonRejection if deserialization fails. The rejection contains the error message and potentially the path to the failing field.

Tuple Fields

0: T

Trait Implementations

impl<T: Clone> Clone for Json<T>

fn clone(&self) -> Json<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Json<T>

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

Formats the value using the given formatter.

impl<T> Deref for Json<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<S, T> FromToolRequest<S> for Json<T>

where T: DeserializeOwned,

type Rejection = JsonRejection

The rejection type returned when extraction fails.

fn from_tool_request( _ctx: &RequestContext, _state: &S, args: &Value, ) -> Result<Self, Self::Rejection>

Extract this type from the tool request.

impl<T: JsonSchema> HasSchema for Json<T>

fn schema() -> Option<Value>

impl<T: Copy> Copy for Json<T>