diff --git a/src/VolcanicCore.Api/Engine/Executor.cs b/src/VolcanicCore.Api/Engine/Executor.cs
index f268a91..386f914 100644
--- a/src/VolcanicCore.Api/Engine/Executor.cs
+++ b/src/VolcanicCore.Api/Engine/Executor.cs
@@ -183,6 +183,16 @@ public sealed class Executor
                 }
 
                 var byPort = BuildInputsByPort(portMap, allowFailurePlaceholders: false);
+
+                // Manual runs honor the node's pinned_input — replaces byPort[0] with the
+                // pinned items. Node's own logic still runs (we intentionally don't skip
+                // upstream ancestors; their output is discarded for THIS node's byPort).
+                if (triggerKind == "manual" && node.PinnedInputJson is { } nodePinJson)
+                {
+                    using var pinDoc = JsonDocument.Parse(nodePinJson);
+                    byPort = new IReadOnlyList<Item>[] { WrapPin(pinDoc.RootElement) };
+                }
+
                 var typ = _nodes.Get(node.TypeId);
                 if (typ is not IActionNode action)
                     throw new InvalidOperationException($"Node {nid} is not an action type.");
diff --git a/tests/VolcanicCore.Tests/ExecutorTests.cs b/tests/VolcanicCore.Tests/ExecutorTests.cs
index 25673bd..3dcbae7 100644
--- a/tests/VolcanicCore.Tests/ExecutorTests.cs
+++ b/tests/VolcanicCore.Tests/ExecutorTests.cs
@@ -474,4 +474,76 @@ public class ExecutorTests
         var port0Item0Json = inputs.RootElement[0][0].GetProperty("json");
         Assert.False(port0Item0Json.GetProperty("pinned").GetBoolean());
     }
+
+    // --- node pinned_input on manual runs ---------------------------------
+
+    [Fact]
+    public async Task Node_pinned_input_overrides_upstream_output_on_manual_run()
+    {
+        var rec = new Recorder { Id = "sink.node_pin_manual" };
+        var (er, nr, exec, _) = Build(new TestTrigger(), new EchoAction(), rec);
+
+        var graph = new WorkflowGraph
+        {
+            Nodes = new[]
+            {
+                new WorkflowNode("t", "test.trigger", null, "{}"),
+                new WorkflowNode("a", "test.echo",    null, "{}"),
+                new WorkflowNode("s", "sink.node_pin_manual", null, "{}",
+                    PinnedInputJson: """{"pinned":true}"""),
+            },
+            Edges = new[]
+            {
+                new WorkflowEdge("t", 0, "a", 0),
+                new WorkflowEdge("a", 0, "s", 0),
+            },
+        };
+
+        var passedIn = new Core.Item(JsonSerializer.SerializeToElement(new { pinned = false }));
+        var eid = await exec.StartExecutionAsync("wf", graph, "t", "manual",
+            new[] { passedIn }, null, null, CancellationToken.None);
+
+        Assert.Equal("completed", er.Get(eid)!.Status);
+        // Sink's persisted inputs must be the pin, not what `a` emitted.
+        var sinkRow = nr.ListByExecution(eid).Single(r => r.NodeId == "s");
+        using var inputs = JsonDocument.Parse(sinkRow.InputsJson);
+        var port0Item0Json = inputs.RootElement[0][0].GetProperty("json");
+        Assert.True(port0Item0Json.GetProperty("pinned").GetBoolean());
+        // `a` still ran and its own output row exists — confirming we don't skip upstream.
+        Assert.Contains(nr.ListByExecution(eid), r => r.NodeId == "a" && r.Status == "completed");
+    }
+
+    [Fact]
+    public async Task Node_pinned_input_is_ignored_on_non_manual_run()
+    {
+        var rec = new Recorder { Id = "sink.node_pin_webhook" };
+        var (er, nr, exec, _) = Build(new TestTrigger(), new EchoAction(), rec);
+
+        var graph = new WorkflowGraph
+        {
+            Nodes = new[]
+            {
+                new WorkflowNode("t", "test.trigger", null, "{}"),
+                new WorkflowNode("a", "test.echo",    null, "{}"),
+                new WorkflowNode("s", "sink.node_pin_webhook", null, "{}",
+                    PinnedInputJson: """{"pinned":true}"""),
+            },
+            Edges = new[]
+            {
+                new WorkflowEdge("t", 0, "a", 0),
+                new WorkflowEdge("a", 0, "s", 0),
+            },
+        };
+
+        var passedIn = new Core.Item(JsonSerializer.SerializeToElement(new { pinned = false }));
+        var eid = await exec.StartExecutionAsync("wf", graph, "t", "http.webhook",
+            new[] { passedIn }, null, null, CancellationToken.None);
+
+        Assert.Equal("completed", er.Get(eid)!.Status);
+        var sinkRow = nr.ListByExecution(eid).Single(r => r.NodeId == "s");
+        using var inputs = JsonDocument.Parse(sinkRow.InputsJson);
+        var port0Item0Json = inputs.RootElement[0][0].GetProperty("json");
+        // Real upstream (echo of the trigger's `pinned:false`) reaches the sink.
+        Assert.False(port0Item0Json.GetProperty("pinned").GetBoolean());
+    }
 }