Method touch

core/src/mcp/manager.rs:189–194

Mark a server as active right now. The framework calls this automatically on connect and on every successful [`call_tool`](Self::call_tool); hosts can call it explicitly to keep a server "warm" out of band (e.g. when a tool result comes back via a different channel).

(&self, name: &str)

    /// to keep a server "warm" out of band (e.g. when a tool result
    /// comes back via a different channel).
    pub async fn touch(&self, name: &str) {
        self.last_used_at_ms
            .write()
            .await
            .insert(name.to_string(), now_epoch_ms());
    }

    /// Disconnect every connected server whose last-used timestamp is
    /// older than `now - idle_threshold_ms`. Returns the names of