Struct InitializeRequest 

pub struct InitializeRequest {
    pub protocol_version: ProtocolVersion,
    pub capabilities: ClientCapabilities,
    pub client_info: ServerInfo,
    pub meta: Option<HashMap<String, Value>>,
}

The initialize request sent by the client as the first message after connection.

Used to exchange capabilities and agree on a protocol version for the session.

Fields

protocol_version: ProtocolVersion

The protocol version the client wishes to use.

capabilities: ClientCapabilities

The capabilities supported by the client.

client_info: ServerInfo

Information about the client’s implementation (e.g., name, version).

meta: Option<HashMap<String, Value>>

Optional metadata for the request.

Per MCP 2025-11-25, _meta is always { [key: string]: unknown } — modelled here as HashMap<String, Value> so non-object values are rejected at deserialize time.

Trait Implementations

impl Clone for InitializeRequest

fn clone(&self) -> InitializeRequest

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for InitializeRequest

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for InitializeRequest

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for InitializeRequest

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.