diff --git a/apps/app/src/components/ui/markdown-message-directives.test.tsx b/apps/app/src/components/ui/markdown-message-directives.test.tsx
index 545edd6a5..96d80542d 100644
--- a/apps/app/src/components/ui/markdown-message-directives.test.tsx
+++ b/apps/app/src/components/ui/markdown-message-directives.test.tsx
@@ -239,6 +239,27 @@ describe("MarkdownPreview message directives", () => {
     expect(screen.queryByTestId("inline-vis")).toBeNull();
   });
 
+  it("mounts a recognized text directive inside prose", () => {
+    const registry = buildMessageDirectiveRegistry([
+      slot({ id: "source-file", pluginId: "demo", component: InlineVis }),
+    ]);
+    render(
+      <MarkdownPreview
+        content={'Result :source-file{file="/tmp/data.xlsx"}'}
+        messageDirectives={{
+          registry,
+          message: MESSAGE,
+          openWorkspaceFile: null,
+        }}
+      />,
+    );
+
+    expect(screen.getByTestId("inline-vis").getAttribute("data-file")).toBe(
+      "/tmp/data.xlsx",
+    );
+    expect(screen.queryByText(/:source-file/)).toBeNull();
+  });
+
   it("keeps clock times intact and leaves the prose as a single text node", () => {
     const registry = buildMessageDirectiveRegistry([
       slot({ id: "inline-vis", pluginId: "demo", component: InlineVis }),