diff --git a/apps/web/src/command-palette/command-groups.test.ts b/apps/web/src/command-palette/command-groups.test.ts
new file mode 100644
index 000000000..4a661cf6a
--- /dev/null
+++ b/apps/web/src/command-palette/command-groups.test.ts
@@ -0,0 +1,71 @@
+import { describe, expect, test } from "bun:test";
+
+import { buildCommandPaletteGroups, type PaletteSource } from "./command-groups";
+
+const workflows = { id: "route:/workflows", title: "Workflows" };
+const settings = { id: "route:/settings", title: "Settings" };
+const pages: PaletteSource = {
+  id: "pages",
+  heading: "Pages",
+  kind: "pages",
+  items: [workflows, settings],
+};
+
+describe("buildCommandPaletteGroups", () => {
+  test("keeps Recent first and omits later duplicates without reordering other results", () => {
+    const groups = buildCommandPaletteGroups({
+      query: "",
+      recents: [workflows],
+      sources: [pages, { id: "duplicates", heading: "Duplicates", items: [workflows, settings] }],
+    });
+
+    expect(groups).toEqual([
+      { id: "recents", heading: "Recent", items: [workflows] },
+      { id: "pages", heading: "Pages", items: [settings] },
+    ]);
+  });
+
+  test("deduplicates scoped results after excluding Recent and out-of-scope sources", () => {
+    const workbench = { id: "entity:workbenches:one", title: "One" };
+    const groups = buildCommandPaletteGroups({
+      query: "#",
+      recents: [workbench],
+      sources: [
+        { id: "unscoped", heading: "Unscoped", items: [workbench] },
+        { id: "pages", heading: "Pages", kind: "pages", items: [workbench] },
+        {
+          id: "workbenches",
+          heading: "Workbenches",
+          kind: "workbenches",
+          items: [workbench],
+        },
+        {
+          id: "duplicates",
+          heading: "Duplicates",
+          kind: "workbenches",
+          items: [workbench],
+        },
+      ],
+    });
+
+    expect(groups).toEqual([{ id: "workbenches", heading: "Workbenches", items: [workbench] }]);
+  });
+
+  test("keeps the first matching result even when an earlier copy does not match", () => {
+    const groups = buildCommandPaletteGroups({
+      query: "work",
+      recents: [workflows],
+      sources: [
+        {
+          id: "nonmatching",
+          heading: "Nonmatching",
+          items: [{ id: workflows.id, title: "Other" }],
+        },
+        pages,
+        { id: "duplicates", heading: "Duplicates", items: [workflows] },
+      ],
+    });
+
+    expect(groups).toEqual([{ id: "pages", heading: "Pages", items: [workflows] }]);
+  });
+});
diff --git a/apps/web/src/command-palette/command-groups.ts b/apps/web/src/command-palette/command-groups.ts
index 111dd1060..878be47d7 100644
--- a/apps/web/src/command-palette/command-groups.ts
+++ b/apps/web/src/command-palette/command-groups.ts
@@ -67,7 +67,10 @@ export function buildCommandPaletteGroups(
     } else if (scope !== null && scope.kind !== source.kind) {
       continue;
     }
-    const items = filterItems(source.items, query);
+    // Scan the small palette; use a Set if result counts grow.
+    const items = filterItems(source.items, query).filter(
+      (item) => !groups.some((group) => group.items.some((existing) => existing.id === item.id)),
+    );
     if (items.length > 0) {
       groups.push({ id: source.id, heading: source.heading, items });
     }