Struct SystemMessage 

pub struct SystemMessage {
    pub subtype: String,
    pub session_id: String,
    pub cwd: String,
    pub tools: Vec<String>,
    pub mcp_servers: Vec<McpServerStatus>,
    pub model: String,
    pub extra: Value,
}

Initialization message synthesized from initialize + session/new responses. Emitted exactly once at the start of each session.

This is not a wire type — it is constructed by the SDK transport layer during the connection handshake and never arrives as a raw JSON-RPC notification.

Fields

subtype: String

Subtype discriminator (e.g., "init").

session_id: String

Unique session identifier assigned by the server.

cwd: String

Server’s current working directory.

tools: Vec<String>

Names of built-in tools available in this session.

mcp_servers: Vec<McpServerStatus>

Status of configured MCP servers.

model: String

Model identifier active for this session.

extra: Value

Unknown fields preserved for forward-compatibility.

Trait Implementations

impl Clone for SystemMessage

fn clone(&self) -> SystemMessage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SystemMessage

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SystemMessage

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for SystemMessage

fn eq(&self, other: &SystemMessage) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for SystemMessage

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for SystemMessage