First Version

crates/mcp-client/src/config.rs

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+use std::collections::HashMap;
+
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct McpServerConfig {
+    pub name:      String,
+    pub transport: McpTransport,
+    /// stdio only: the executable to spawn.
+    pub command:   Option<String>,
+    /// stdio only: arguments passed to the command.
+    pub args:      Option<Vec<String>>,
+    /// stdio only: extra environment variables (values support `${VAR}` interpolation).
+    pub env:       Option<HashMap<String, String>>,
+    /// http only: base URL of the MCP server.
+    pub url:     Option<String>,
+    /// http only: API key sent as `Authorization: Bearer <key>` (supports `${VAR}` interpolation).
+    pub api_key: Option<String>,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+#[serde(rename_all = "snake_case")]
+pub enum McpTransport {
+    Stdio,
+    /// Streamable HTTP (remote MCP servers — previously called SSE).
+    Http,
+    /// Alias kept for backwards compatibility.
+    Sse,
+}