src-tauri/src/lib.rs

@@ -280,3 +280,45 @@ pub(crate) fn update_tray_tooltip(app: &tauri::AppHandle, text: &str) {
         let _ = tray.0.set_tooltip(Some(text));
     }
 }
+
+/// Entry point for `whispassist.exe --mcp-stdio` (FR-MCP-6): serves one MCP
+/// session over this process's own stdin/stdout instead of showing a window,
+/// against the same `wa.db` the GUI instance uses. There is no Tauri
+/// `AppHandle` in this mode, so `mcp://access` events have nowhere to go —
+/// the `mcp_access_log` DB row is still written regardless (FR-MCP-5).
+pub fn run_mcp_stdio() {
+    #[cfg(feature = "mcp")]
+    {
+        // stderr, not stdout: stdout is the MCP JSON-RPC channel.
+        let _ = tracing_subscriber::fmt()
+            .with_env_filter("info")
+            .with_writer(std::io::stderr)
+            .try_init();
+        let rt = match tokio::runtime::Builder::new_multi_thread().enable_all().build() {
+            Ok(rt) => rt,
+            Err(e) => {
+                eprintln!("whispassist --mcp-stdio: failed to start a runtime: {e}");
+                std::process::exit(1);
+            }
+        };
+        rt.block_on(async {
+            let store: std::sync::Arc<dyn storage::Store> = match storage::SqliteStore::connect().await {
+                Ok(s) => std::sync::Arc::new(s),
+                Err(e) => {
+                    eprintln!("whispassist --mcp-stdio: failed to open wa.db: {e}");
+                    std::process::exit(1);
+                }
+            };
+            let handler = mcp::handler::WaMcpHandler::new(store, None);
+            if let Err(e) = mcp::stdio_transport::serve_once(handler).await {
+                eprintln!("whispassist --mcp-stdio: session ended with an error: {e}");
+                std::process::exit(1);
+            }
+        });
+    }
+    #[cfg(not(feature = "mcp"))]
+    {
+        eprintln!("this build was compiled without MCP support (the `mcp` cargo feature is off)");
+        std::process::exit(1);
+    }
+}