Enum McpTransport 

#[non_exhaustive]
pub enum McpTransport {
    Stdio {
        command: String,
        args: Vec<String>,
        env: BTreeMap<String, String>,
    },
    Http {
        url: String,
        headers: BTreeMap<String, String>,
    },
    Sse {
        url: String,
        headers: BTreeMap<String, String>,
    },
}

How an MCP server is reached.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Stdio

Local subprocess launched via stdio (most common). The harness spawns command with args, inheriting env overrides on top of the harness environment.

Fields

command: String

Executable name or absolute path.

args: Vec<String>

Arguments passed to the command.

env: BTreeMap<String, String>

Environment variables set when launching the command. BTreeMap for stable serialization order.

Http

HTTP endpoint (Cursor and Claude support; many harnesses do not).

Fields

url: String

Server URL.

headers: BTreeMap<String, String>

Additional headers (e.g. Authorization).

Sse

Server-sent-events endpoint.

Fields

url: String

Server URL.

headers: BTreeMap<String, String>

Additional headers (e.g. Authorization).

Trait Implementations

impl Clone for McpTransport

fn clone(&self) -> McpTransport

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for McpTransport

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

Formats the value using the given formatter.