diff --git a/src/ZB.MOM.WW.ScadaBridge.Commons/Messages/Management/FlowDebugCommands.cs b/src/ZB.MOM.WW.ScadaBridge.Commons/Messages/Management/FlowDebugCommands.cs
index 7231b1e9..42e89448 100644
--- a/src/ZB.MOM.WW.ScadaBridge.Commons/Messages/Management/FlowDebugCommands.cs
+++ b/src/ZB.MOM.WW.ScadaBridge.Commons/Messages/Management/FlowDebugCommands.cs
@@ -24,6 +24,27 @@ public record FlowDebugRunMethodCommand(int ApiMethodId, JsonElement? Parameters
 /// <param name="WaitSeconds">How long to wait for a spawned run before reporting <c>NO_TRIGGER_WITHIN_WINDOW</c>.</param>
 public record FlowDebugRunValueChangeCommand(int InstanceId, string AttributeName, string Value, int WaitSeconds = 45);
 
+/// <summary>
+/// Flow Debugger Live run of a site script by name (design 2026-09-08). The runner resolves the
+/// script's effective definition from the flattened instance configuration and branches on its
+/// trigger kind: a <c>ValueChange</c>/<c>Conditional</c> script is fired by WRITING its monitored
+/// attribute (<paramref name="Value"/>) and polling for the spawned run, exactly like
+/// <see cref="FlowDebugRunValueChangeCommand"/>; every other kind is invoked DIRECTLY through the
+/// traced routed-call path with <paramref name="Parameters"/>. Deployer role; refuses on a standby
+/// with <c>STANDBY_NODE</c>.
+/// </summary>
+/// <param name="InstanceId">The instance the script belongs to.</param>
+/// <param name="ScriptName">Canonical script name from the flattened configuration (case-insensitive).</param>
+/// <param name="Parameters">Call kinds: flat JSON object validated against the script's ParameterDefinitions; null = none.</param>
+/// <param name="Value">Write kinds: canonical string value to write to the trigger's attribute.</param>
+/// <param name="WaitSeconds">Write kinds: how long to wait for a spawned run before <c>NO_TRIGGER_WITHIN_WINDOW</c>.</param>
+public record FlowDebugRunScriptCommand(
+    int InstanceId,
+    string ScriptName,
+    JsonElement? Parameters,
+    string? Value,
+    int WaitSeconds = 45);
+
 /// <summary>
 /// Flow Debugger Replay (design 2026-09-05 §7.1): returns the audit events of the execution
 /// tree that <paramref name="ExecutionId"/> belongs to, from the central store.