diff --git a/test/sageclient/README.md b/test/sageclient/README.md
index 60851e1..bce148c 100644
--- a/test/sageclient/README.md
+++ b/test/sageclient/README.md
@@ -35,6 +35,8 @@ Extra Gradle arguments can be appended, for example:
 
 ## Run
 
+Run without arguments to open the sample shell:
+
 ```bash
 cd /path/to/bricks-mp/test/sageclient
 ../../gradlew run \
@@ -42,6 +44,21 @@ cd /path/to/bricks-mp/test/sageclient
   -Dsage.centerUi=/center.ui
 ```
 
+Run with a startup URL to enter that UI directly:
+
+```bash
+cd /path/to/bricks-mp/test/sageclient
+../../gradlew run --args="https://ai.atvoe.com/center.ui"
+```
+
+The packaged macOS app also accepts the URL as its first argument:
+
+```bash
+open build/compose/binaries/main/app/sageclient.app --args https://ai.atvoe.com/center.ui
+```
+
+If the argument is an absolute `http://` or `https://` URL, `sageclient` uses the URL origin as `baseUrl` and loads the path/query part as the initial Bricks UI. If the argument is a relative path such as `/center.ui`, it uses `sage.baseUrl` and loads that path.
+
 Optional properties:
 
 - `sage.baseUrl` defaults to `http://localhost:8080`
diff --git a/test/sageclient/src/jvmMain/kotlin/com/bricks/test/sageclient/Main.kt b/test/sageclient/src/jvmMain/kotlin/com/bricks/test/sageclient/Main.kt
index d67a1e7..3832d89 100644
--- a/test/sageclient/src/jvmMain/kotlin/com/bricks/test/sageclient/Main.kt
+++ b/test/sageclient/src/jvmMain/kotlin/com/bricks/test/sageclient/Main.kt
@@ -51,14 +51,21 @@ private const val DEFAULT_CENTER_UI = "/center.ui"
 private const val DEFAULT_LOGIN_ACTION = "/rbac/user/login"
 private const val DEFAULT_LOGIN_UI = "/rbac/user/login.ui"
 
-fun main() = application {
+fun main(args: Array<String>) = application {
     val context = remember { BricksContext() }
     val http = remember { BricksHttp(context) }
     val scope = rememberCoroutineScope()
     val windowState = remember { WindowState(width = 1280.dp, height = 800.dp) }
 
+    val startupUrl = remember(args) { args.firstOrNull()?.takeIf { it.isNotBlank() } }
+
     LaunchedEffect(Unit) {
-        context.baseUrl = System.getProperty("sage.baseUrl", DEFAULT_BASE_URL)
+        val initialUrl = startupUrl
+        if (initialUrl != null) {
+            configureContextFromStartupUrl(context, initialUrl)
+        } else {
+            context.baseUrl = System.getProperty("sage.baseUrl", DEFAULT_BASE_URL)
+        }
     }
 
     Window(
@@ -115,6 +122,19 @@ fun main() = application {
             }
 
             val currentWidget by context.currentWidget.collectAsState()
+
+            LaunchedEffect(actionDispatcher, startupUrl) {
+                startupUrl?.let { url ->
+                    actionDispatcher.dispatch(
+                        BricksBind(
+                            event = "startup",
+                            actiontype = "urlwidget",
+                            url = toWidgetPath(url)
+                        )
+                    )
+                }
+            }
+
             SageClientScreen(
                 baseUrl = context.baseUrl,
                 widget = currentWidget,
@@ -246,6 +266,38 @@ private fun SageClientScreen(
     }
 }
 
+private fun configureContextFromStartupUrl(context: BricksContext, startupUrl: String) {
+    if (startupUrl.startsWith("http://") || startupUrl.startsWith("https://")) {
+        context.baseUrl = startupUrl.originPart()
+    } else {
+        context.baseUrl = System.getProperty("sage.baseUrl", DEFAULT_BASE_URL)
+    }
+}
+
+private fun toWidgetPath(startupUrl: String): String {
+    if (!startupUrl.startsWith("http://") && !startupUrl.startsWith("https://")) return startupUrl
+    val pathWithQuery = startupUrl.pathAndQueryPart()
+    return pathWithQuery.ifBlank { "/" }
+}
+
+private fun String.originPart(): String {
+    val schemeEnd = indexOf("://")
+    if (schemeEnd < 0) return ""
+    val authorityStart = schemeEnd + 3
+    val authorityEnd = indexOf('/', startIndex = authorityStart).let { if (it < 0) length else it }
+    return substring(0, authorityEnd)
+}
+
+private fun String.pathAndQueryPart(): String {
+    val schemeEnd = indexOf("://")
+    val pathStart = if (schemeEnd >= 0) {
+        indexOf('/', startIndex = schemeEnd + 3).let { if (it < 0) return "" else it }
+    } else {
+        0
+    }
+    return substring(pathStart).substringBefore('#')
+}
+
 private suspend fun loginAndLoadCenter(
     context: BricksContext,
     http: BricksHttp,