Fix reusable workspace recency ordering

ui/src/lib/reusable-execution-workspaces.test.ts

@@ -6,17 +6,17 @@ function workspace(overrides: Partial<ReusableExecutionWorkspaceLike>): Reusable
     id: overrides.id ?? "workspace-id",
     name: overrides.name ?? "Workspace",
     cwd: overrides.cwd ?? null,
-    updatedAt: overrides.updatedAt ?? "2026-01-01T00:00:00.000Z",
+    lastUsedAt: overrides.lastUsedAt ?? "2026-01-01T00:00:00.000Z",
   };
 }
 
 describe("orderReusableExecutionWorkspaces", () => {
-  it("puts the most recently updated workspace first and sorts the rest alphabetically", () => {
+  it("puts the most recently used workspace first and sorts the rest alphabetically", () => {
     const workspaces = [
-      workspace({ id: "charlie", name: "Charlie", updatedAt: "2026-01-03T00:00:00.000Z" }),
-      workspace({ id: "zulu", name: "Zulu", updatedAt: "2026-01-05T00:00:00.000Z" }),
-      workspace({ id: "alpha", name: "Alpha", updatedAt: "2026-01-01T00:00:00.000Z" }),
-      workspace({ id: "bravo", name: "Bravo", updatedAt: "2026-01-04T00:00:00.000Z" }),
+      workspace({ id: "charlie", name: "Charlie", lastUsedAt: "2026-01-03T00:00:00.000Z" }),
+      workspace({ id: "zulu", name: "Zulu", lastUsedAt: "2026-01-05T00:00:00.000Z" }),
+      workspace({ id: "alpha", name: "Alpha", lastUsedAt: "2026-01-01T00:00:00.000Z" }),
+      workspace({ id: "bravo", name: "Bravo", lastUsedAt: "2026-01-04T00:00:00.000Z" }),
     ];
 
     expect(orderReusableExecutionWorkspaces(workspaces).map((item) => item.id)).toEqual([
@@ -27,12 +27,22 @@ describe("orderReusableExecutionWorkspaces", () => {
     ]);
   });
 
-  it("keeps only the latest updated workspace for duplicate paths before sorting", () => {
+  it("keeps only the latest used workspace for duplicate paths before sorting", () => {
     const workspaces = [
-      workspace({ id: "older-duplicate", name: "Older duplicate", cwd: "/tmp/shared", updatedAt: "2026-01-01T00:00:00.000Z" }),
-      workspace({ id: "beta", name: "Beta", cwd: "/tmp/beta", updatedAt: "2026-01-02T00:00:00.000Z" }),
-      workspace({ id: "newer-duplicate", name: "Newer duplicate", cwd: "/tmp/shared", updatedAt: "2026-01-04T00:00:00.000Z" }),
-      workspace({ id: "alpha", name: "Alpha", cwd: "/tmp/alpha", updatedAt: "2026-01-03T00:00:00.000Z" }),
+      workspace({
+        id: "older-duplicate",
+        name: "Older duplicate",
+        cwd: "/tmp/shared",
+        lastUsedAt: "2026-01-01T00:00:00.000Z",
+      }),
+      workspace({ id: "beta", name: "Beta", cwd: "/tmp/beta", lastUsedAt: "2026-01-02T00:00:00.000Z" }),
+      workspace({
+        id: "newer-duplicate",
+        name: "Newer duplicate",
+        cwd: "/tmp/shared",
+        lastUsedAt: "2026-01-04T00:00:00.000Z",
+      }),
+      workspace({ id: "alpha", name: "Alpha", cwd: "/tmp/alpha", lastUsedAt: "2026-01-03T00:00:00.000Z" }),
     ];
 
     expect(orderReusableExecutionWorkspaces(workspaces).map((item) => item.id)).toEqual([
@@ -41,4 +51,32 @@ describe("orderReusableExecutionWorkspaces", () => {
       "beta",
     ]);
   });
+
+  it("does not let updatedAt churn outrank the last used workspace", () => {
+    type WorkspaceWithUpdatedAt = ReusableExecutionWorkspaceLike & { updatedAt: Date | string };
+    const workspaces: WorkspaceWithUpdatedAt[] = [
+      {
+        ...workspace({
+          id: "recently-used",
+          name: "Recently used",
+          cwd: "/tmp/shared",
+          lastUsedAt: "2026-01-04T00:00:00.000Z",
+        }),
+        updatedAt: "2026-01-01T00:00:00.000Z",
+      },
+      {
+        ...workspace({
+          id: "recently-updated",
+          name: "Recently updated",
+          cwd: "/tmp/shared",
+          lastUsedAt: "2026-01-01T00:00:00.000Z",
+        }),
+        updatedAt: "2026-01-05T00:00:00.000Z",
+      },
+    ];
+
+    expect(orderReusableExecutionWorkspaces(workspaces).map((item) => item.id)).toEqual([
+      "recently-used",
+    ]);
+  });
 });

ui/src/lib/reusable-execution-workspaces.ts

@@ -2,11 +2,11 @@ export interface ReusableExecutionWorkspaceLike {
   id: string;
   name: string;
   cwd: string | null;
-  updatedAt: Date | string;
+  lastUsedAt: Date | string;
 }
 
-function workspaceUpdatedTime(workspace: Pick<ReusableExecutionWorkspaceLike, "updatedAt">) {
-  const time = new Date(workspace.updatedAt).getTime();
+function workspaceLastUsedTime(workspace: Pick<ReusableExecutionWorkspaceLike, "lastUsedAt">) {
+  const time = new Date(workspace.lastUsedAt).getTime();
   return Number.isFinite(time) ? time : 0;
 }
 
@@ -27,7 +27,7 @@ export function orderReusableExecutionWorkspaces<T extends ReusableExecutionWork
   for (const workspace of workspaces) {
     const key = workspace.cwd ?? workspace.id;
     const existing = deduplicatedByPath.get(key);
-    if (!existing || workspaceUpdatedTime(workspace) > workspaceUpdatedTime(existing)) {
+    if (!existing || workspaceLastUsedTime(workspace) > workspaceLastUsedTime(existing)) {
       deduplicatedByPath.set(key, workspace);
     }
   }
@@ -35,15 +35,15 @@ export function orderReusableExecutionWorkspaces<T extends ReusableExecutionWork
   const alphabetized = Array.from(deduplicatedByPath.values()).sort(compareWorkspaceNames);
   if (alphabetized.length <= 1) return alphabetized;
 
-  let mostRecentlyUpdated = alphabetized[0]!;
+  let mostRecentlyUsed = alphabetized[0]!;
   for (const workspace of alphabetized.slice(1)) {
-    if (workspaceUpdatedTime(workspace) > workspaceUpdatedTime(mostRecentlyUpdated)) {
-      mostRecentlyUpdated = workspace;
+    if (workspaceLastUsedTime(workspace) > workspaceLastUsedTime(mostRecentlyUsed)) {
+      mostRecentlyUsed = workspace;
     }
   }
 
   return [
-    mostRecentlyUpdated,
-    ...alphabetized.filter((workspace) => workspace.id !== mostRecentlyUpdated.id),
+    mostRecentlyUsed,
+    ...alphabetized.filter((workspace) => workspace.id !== mostRecentlyUsed.id),
   ];
 }