Struct ToolHostConfig 

pub struct ToolHostConfig {
    pub server_name: String,
    pub bind_addr: IpAddr,
    pub port: u16,
    pub instructions: Option<String>,
}

How the endpoint binds.

Fields

server_name: String

Emitted as mcpServers[].name, so it namespaces the tools the model sees. A tool get_activities under server dravr is reported by the agent as dravr-get_activities.

bind_addr: IpAddr

Interface to bind. Loopback by default — widening it publishes the caller’s entire tool surface to the network.

port: u16

0 lets the kernel assign, which is what you want: no port to configure, and no collision between concurrent stacks on one host.

instructions: Option<String>

Natural-language instructions served at initialize.

An agent that opts in — Copilot’s CLI does so with --allow-all-mcp-server-instructions — folds these into its SYSTEM prompt. That matters when the caller has a persona to impose: a CLI runner with no system-prompt flag can only put one in the prompt body, where the model reads it as the user talking and answers as itself. This is the one channel that reaches the system layer.

Trait Implementations

impl Clone for ToolHostConfig

fn clone(&self) -> ToolHostConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ToolHostConfig

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

Formats the value using the given formatter.

impl Default for ToolHostConfig

fn default() -> Self

Returns the “default value” for a type.