Enum ClientRequest 

pub enum ClientRequest {
    InitializeRequest(InitializeRequest),
    AuthenticateRequest(AuthenticateRequest),
    NewSessionRequest(NewSessionRequest),
    LoadSessionRequest(LoadSessionRequest),
    SetSessionModeRequest(SetSessionModeRequest),
    PromptRequest(PromptRequest),
    ExtMethodRequest(ExtRequest),
}

All possible requests that a client can send to an agent.

This enum is used internally for routing RPC requests. You typically won’t need to use this directly - instead, use the methods on the [Agent] trait.

This enum encompasses all method calls from client to agent.

Variants

InitializeRequest(InitializeRequest)

Establishes the connection with a client and negotiates protocol capabilities.

This method is called once at the beginning of the connection to:

• Negotiate the protocol version to use
• Exchange capability information between client and agent
• Determine available authentication methods

The agent should respond with its supported protocol version and capabilities.

See protocol docs: Initialization

AuthenticateRequest(AuthenticateRequest)

Authenticates the client using the specified authentication method.

Called when the agent requires authentication before allowing session creation. The client provides the authentication method ID that was advertised during initialization.

After successful authentication, the client can proceed to create sessions with new_session without receiving an auth_required error.

See protocol docs: Initialization

NewSessionRequest(NewSessionRequest)

Creates a new conversation session with the agent.

Sessions represent independent conversation contexts with their own history and state.

The agent should:

• Create a new session context
• Connect to any specified MCP servers
• Return a unique session ID for future requests

May return an auth_required error if the agent requires authentication.

See protocol docs: Session Setup

LoadSessionRequest(LoadSessionRequest)

Loads an existing session to resume a previous conversation.

This method is only available if the agent advertises the loadSession capability.

The agent should:

• Restore the session context and conversation history
• Connect to the specified MCP servers
• Stream the entire conversation history back to the client via notifications

See protocol docs: Loading Sessions

SetSessionModeRequest(SetSessionModeRequest)

Sets the current mode for a session.

Allows switching between different agent modes (e.g., “ask”, “architect”, “code”) that affect system prompts, tool availability, and permission behaviors.

The mode must be one of the modes advertised in availableModes during session creation or loading. Agents may also change modes autonomously and notify the client via current_mode_update notifications.

This method can be called at any time during a session, whether the Agent is idle or actively generating a response.

See protocol docs: Session Modes

PromptRequest(PromptRequest)

Processes a user prompt within a session.

This method handles the whole lifecycle of a prompt:

• Receives user messages with optional context (files, images, etc.)
• Processes the prompt using language models
• Reports language model content and tool calls to the Clients
• Requests permission to run tools
• Executes any requested tool calls
• Returns when the turn is complete with a stop reason

See protocol docs: Prompt Turn

ExtMethodRequest(ExtRequest)

Handles extension method requests from the client.

Extension methods provide a way to add custom functionality while maintaining protocol compatibility.

See protocol docs: Extensibility

Trait Implementations

impl Clone for ClientRequest

fn clone(&self) -> ClientRequest

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ClientRequest

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ClientRequest

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl JsonSchema for ClientRequest

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl Serialize for ClientRequest

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

where __S: Serializer,

Serialize this value into the given Serde serializer.