Enum InputRequest 

pub enum InputRequest {
    CreateMessage(CreateMessageRequest),
    ListRoots(ListRootsRequest),
    Elicit(ElicitRequest),
}

Core MCP protocol types and error handling Server → client request emitted as part of an InputRequiredResult.

type InputRequest = CreateMessageRequest | ListRootsRequest | ElicitRequest.

Serialized untagged at the Rust level; the custom Deserialize impl dispatches on the wire method string (sampling/createMessage, roots/list, elicitation/create) and rejects any other value, so the schema’s union discriminator is enforced explicitly rather than relying on first-variant-wins fallback.

Note: CreateMessageRequest (Sampling) and ListRootsRequest (Roots) are themselves deprecated per SEP-2577 in 2026-07-28. They remain valid variants of InputRequest during the 12-month migration window so servers can continue to ask clients for sampling/roots input via the MRTR pattern (SEP-2322). After the deprecated features are removed, the corresponding variants will be removed from this enum.

Variants

CreateMessage(CreateMessageRequest)

sampling/createMessage request. Deprecated per SEP-2577.

ListRoots(ListRootsRequest)

roots/list request. Deprecated per SEP-2577.

Elicit(ElicitRequest)

elicitation/create request.

Trait Implementations

impl Clone for InputRequest

fn clone(&self) -> InputRequest

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for InputRequest

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for InputRequest

fn deserialize<D>( deserializer: D, ) -> Result<InputRequest, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for InputRequest

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.