fix(mcp): Fix legacy MCP SSE connections

crates/tui/src/commands/mcp.rs

@@ -56,9 +56,15 @@ fn parse_add(parts: Vec<&str>) -> CommandResult {
             command: parts[2].to_string(),
             args: parts[3..].iter().map(|s| (*s).to_string()).collect(),
         })),
-        "http" | "sse" => CommandResult::action(AppAction::Mcp(McpUiAction::AddHttp {
+        "http" => CommandResult::action(AppAction::Mcp(McpUiAction::AddHttp {
             name: parts[1].to_string(),
             url: parts[2].to_string(),
+            transport: None,
+        })),
+        "sse" => CommandResult::action(AppAction::Mcp(McpUiAction::AddHttp {
+            name: parts[1].to_string(),
+            url: parts[2].to_string(),
+            transport: Some("sse".to_string()),
         })),
         _ => CommandResult::error(
             "Usage: /mcp add stdio <name> <command> [args...] OR /mcp add http <name> <url>",

crates/tui/src/main.rs

@@ -631,6 +631,9 @@ enum McpCommand {
         /// URL for streamable HTTP/SSE server
         #[arg(long, conflicts_with = "command")]
         url: Option<String>,
+        /// Explicit URL transport override. Use "sse" for legacy SSE endpoints.
+        #[arg(long, requires = "url")]
+        transport: Option<String>,
         /// Arguments for command-based servers
         #[arg(long = "arg")]
         args: Vec<String>,
@@ -1417,6 +1420,7 @@ fn mcp_template_json() -> Result<String> {
             args: vec!["./path/to/your-mcp-server.js".to_string()],
             env: std::collections::HashMap::new(),
             url: None,
+            transport: None,
             connect_timeout: None,
             execute_timeout: None,
             read_timeout: None,
@@ -4131,11 +4135,17 @@ async fn run_mcp_command(config: &Config, command: McpCommand) -> Result<()> {
             name,
             command,
             url,
+            transport,
             args,
         } => {
             if command.is_none() && url.is_none() {
                 bail!("Provide either --command or --url for `mcp add`.");
             }
+            if let Some(transport) = transport.as_deref() {
+                if !transport.trim().eq_ignore_ascii_case("sse") {
+                    bail!("Unsupported MCP transport '{transport}'. Supported values: sse");
+                }
+            }
             let mut cfg = load_mcp_config(&config_path)?;
             cfg.servers.insert(
                 name.clone(),
@@ -4144,6 +4154,7 @@ async fn run_mcp_command(config: &Config, command: McpCommand) -> Result<()> {
                     args,
                     env: std::collections::HashMap::new(),
                     url,
+                    transport,
                     connect_timeout: None,
                     execute_timeout: None,
                     read_timeout: None,
@@ -4230,6 +4241,7 @@ async fn run_mcp_command(config: &Config, command: McpCommand) -> Result<()> {
                     args,
                     env: std::collections::HashMap::new(),
                     url: None,
+                    transport: None,
                     connect_timeout: None,
                     execute_timeout: None,
                     read_timeout: None,
@@ -6718,6 +6730,7 @@ mod doctor_mcp_tests {
             args: args.iter().map(|s| s.to_string()).collect(),
             env: std::collections::HashMap::new(),
             url: url.map(String::from),
+            transport: None,
             connect_timeout: None,
             execute_timeout: None,
             read_timeout: None,