diff --git a/src/OpenClaw.Shared/Mxc/MxcConfigBuilder.cs b/src/OpenClaw.Shared/Mxc/MxcConfigBuilder.cs
index a80b3f345..5e79f1c22 100644
--- a/src/OpenClaw.Shared/Mxc/MxcConfigBuilder.cs
+++ b/src/OpenClaw.Shared/Mxc/MxcConfigBuilder.cs
@@ -550,10 +550,9 @@ private static bool SelectsCmdCommandMode(IReadOnlyList<string> argv)
             if (!argument.StartsWith("/", StringComparison.Ordinal))
                 continue;
 
-            if (argument.StartsWith("/c", StringComparison.OrdinalIgnoreCase)
-                || argument.StartsWith("/k", StringComparison.OrdinalIgnoreCase)
-                || argument.Contains("/c", StringComparison.OrdinalIgnoreCase)
-                || argument.Contains("/k", StringComparison.OrdinalIgnoreCase))
+            if (argument.Contains("/c", StringComparison.OrdinalIgnoreCase)
+                || argument.Contains("/k", StringComparison.OrdinalIgnoreCase)
+                || argument.Contains("/r", StringComparison.OrdinalIgnoreCase))
             {
                 return true;
             }
diff --git a/tests/OpenClaw.Shared.Tests/Mxc/MxcConfigBuilderTests.cs b/tests/OpenClaw.Shared.Tests/Mxc/MxcConfigBuilderTests.cs
index f6bf73302..747e379e6 100644
--- a/tests/OpenClaw.Shared.Tests/Mxc/MxcConfigBuilderTests.cs
+++ b/tests/OpenClaw.Shared.Tests/Mxc/MxcConfigBuilderTests.cs
@@ -790,6 +790,24 @@ public void Build_DirectArgv_LateCmdCommandMode_FailsClosed()
         Assert.Contains("canonical argv", error.Message, StringComparison.Ordinal);
     }
 
+    [Theory]
+    [InlineData("/R", "echo hi")]
+    [InlineData("/r", "prog", "hello&calc")]
+    [InlineData("/Recho hi")]
+    [InlineData("/rcommand")]
+    [InlineData("/d/s/recho hi")]
+    public void Build_DirectArgv_CmdSlashRCommandMode_FailsClosed(params string[] tail)
+    {
+        string[] argv = [ExpectedSystemCmdExe(), .. tail];
+        using var argsDoc = JsonDocument.Parse(JsonSerializer.Serialize(new { argv }));
+        var request = RequestFor(BalancedPolicy()) with { Args = argsDoc.RootElement.Clone() };
+
+        var error = Assert.Throws<NotSupportedException>(
+            () => BuildConfig(request, pathEnvVar: ""));
+
+        Assert.Contains("canonical argv", error.Message, StringComparison.Ordinal);
+    }
+
     [Fact]
     public void Build_CmdBootstrapRefsWithDelayedExpansionSyntax_FailsClosed()
     {