Transport Overview

rust-mcp-sdk supports three transport protocols:

Transport	Use Case
Stdio	Local subprocess - server runs as a child process
Streamable HTTP	Remote HTTP - modern, streaming, SSE-free
SSE	Backward-compatible legacy SSE transport

TransportOptions

pub struct TransportOptions {
    /// Request timeout; how long to wait for a response before considering
    /// the request timed out.
    pub timeout: Duration,
    /// Maximum size (in bytes) of a single newline-delimited incoming message.
    /// Default: 16 MiB.
    pub max_line_length: usize,
    /// Capacity of the incoming-message channel buffer. Default: 36.
    pub channel_capacity: usize,
}