Struct State 

pub struct State<T>(pub Arc<T>);

Available on non-WebAssembly only.

State extractor for #[mcp_tool] functions.

Wraps shared state in Arc<T> and auto-derefs to &T, eliminating the manual Arc::clone() + move closure ceremony.

Example

use pmcp::State;

#[mcp_tool(description = "Query database")]
async fn query(args: QueryArgs, db: State<Database>) -> Result<Value> {
    db.execute(&args.sql).await  // auto-deref to &Database
}

// At registration:
server_builder.tool("query", query().with_state(my_db))

Tuple Fields

0: Arc<T>

Trait Implementations

impl<T> AsRef<T> for State<T>

fn as_ref(&self) -> &T

Converts this type into a shared reference of the (usually inferred) input type.

impl<T> Clone for State<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for State<T>

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

Formats the value using the given formatter.

impl<T> Deref for State<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T> From<Arc<T>> for State<T>

fn from(arc: Arc<T>) -> Self

Converts to this type from the input type.

impl<T> From<T> for State<T>

fn from(val: T) -> Self

Converts to this type from the input type.