diff --git a/surfaces/gui/src/components/Markdown.test.tsx b/surfaces/gui/src/components/Markdown.test.tsx
index 6707e3196..b61d506ee 100644
--- a/surfaces/gui/src/components/Markdown.test.tsx
+++ b/surfaces/gui/src/components/Markdown.test.tsx
@@ -36,6 +36,18 @@ describe("Markdown artifact links", () => {
     expect(screen.getByTestId("artifact-chip").textContent).toContain("report.pdf");
   });
 
+  it("dispatches a decoded Unicode filename", () => {
+    const seen: string[] = [];
+    const listener = (e: Event) => seen.push((e as CustomEvent).detail.path);
+    window.addEventListener(OPEN_ARTIFACT_EVENT, listener);
+
+    render(<Markdown text="[News](artifact:%E6%96%B0%E9%97%BB%E6%91%98%E8%A6%81.md)" />);
+    fireEvent.click(screen.getByTestId("artifact-chip"));
+    expect(seen).toEqual(["新闻摘要.md"]);
+
+    window.removeEventListener(OPEN_ARTIFACT_EVENT, listener);
+  });
+
   // Seventeenth pass: the lead's one-time board mention — [Board · 5 items](board:)
   // renders as an inline pill that opens the drawer on its Board section.
   it("renders a board: link as a pill and dispatches the open-board event", () => {
diff --git a/surfaces/gui/src/components/Markdown.tsx b/surfaces/gui/src/components/Markdown.tsx
index e27a6627a..18710212a 100644
--- a/surfaces/gui/src/components/Markdown.tsx
+++ b/surfaces/gui/src/components/Markdown.tsx
@@ -31,14 +31,22 @@ function BoardChip({ label }: { label: string }) {
 
 function ArtifactChip({ path, title }: { path: string; title: string }) {
   const { t } = useTranslation();
-  const file = path.split("/").pop() || path;
+  let decodedPath = path;
+  try {
+    decodedPath = decodeURIComponent(path);
+  } catch {
+    // Literal percent signs are valid in filenames even when they are not URL encoding.
+  }
+  const file = decodedPath.split(/[\\/]/).pop() || decodedPath;
   return (
     <button
       className="art-chip"
       data-testid="artifact-chip"
-      title={path}
+      title={decodedPath}
       onClick={() =>
-        window.dispatchEvent(new CustomEvent(OPEN_ARTIFACT_EVENT, { detail: { path } }))
+        window.dispatchEvent(
+          new CustomEvent(OPEN_ARTIFACT_EVENT, { detail: { path: decodedPath } }),
+        )
       }
     >
       <span className="art-chip-ico">