diff --git a/packages/provider-core/src/server/notification.test.ts b/packages/provider-core/src/server/notification.test.ts
index 272cd007632a2..f8d0b1d113d46 100644
--- a/packages/provider-core/src/server/notification.test.ts
+++ b/packages/provider-core/src/server/notification.test.ts
@@ -60,6 +60,16 @@ describe("backgroundWorkNotification", () => {
       outcome: "cancelled",
       summary: 'Subagent "Agent B" and command "Sleep 60 seconds" were stopped',
     });
+    assert.deepInclude(
+      backgroundWorkNotification([
+        { kind: "command", label: "npm test", outcome: "completed", exitCode: 0 },
+        { kind: "command", label: "npm run lint", outcome: "failed", exitCode: 1 },
+      ]),
+      {
+        outcome: "failed",
+        summary: 'Command "npm test" finished (exit 0) and command "npm run lint" failed (exit 1)',
+      },
+    );
   });
 
   it("counts work it cannot list", () => {
@@ -73,6 +83,18 @@ describe("backgroundWorkNotification", () => {
       outcome: "completed",
       summary: "4 subagents finished",
     });
+    assert.deepEqual(
+      backgroundWorkNotification(
+        reports.map((report, index) =>
+          index === 0 ? { ...report, outcome: "failed" as const } : report,
+        ),
+      ),
+      {
+        source: { kind: "subagent" },
+        outcome: "failed",
+        summary: "1 subagent failed and 3 finished",
+      },
+    );
   });
 });
 
diff --git a/packages/provider-core/src/server/notification.ts b/packages/provider-core/src/server/notification.ts
index 55b1125fd9448..9ccb425faf2d1 100644
--- a/packages/provider-core/src/server/notification.ts
+++ b/packages/provider-core/src/server/notification.ts
@@ -71,11 +71,26 @@ function exitSuffix(report: BackgroundWorkReport): string {
     : "";
 }
 
-function namedReport(report: BackgroundWorkReport, capitalize: boolean): string {
+function namedReport(report: BackgroundWorkReport, capitalize: boolean, verb?: string): string {
   const noun = KIND_NOUN[report.kind][0];
   const label = reportLabel(report.label);
   const named = `${capitalize ? noun : noun.toLowerCase()}${label === undefined ? "" : ` "${label}"`}`;
-  return `${named}${exitSuffix(report)}`;
+  return `${named}${verb === undefined ? "" : ` ${verb}`}${exitSuffix(report)}`;
+}
+
+const OUTCOME_GROUPS = ["failed", "cancelled", "updated", "completed"] as const;
+
+function groupVerb(group: (typeof OUTCOME_GROUPS)[number], count: number): string {
+  switch (group) {
+    case "failed":
+      return "failed";
+    case "cancelled":
+      return count === 1 ? "was stopped" : "were stopped";
+    case "updated":
+      return "updated";
+    case "completed":
+      return "finished";
+  }
 }
 
 function joinNames(names: ReadonlyArray<string>): string {
@@ -85,7 +100,6 @@ function joinNames(names: ReadonlyArray<string>): string {
 
 function reportsSummary(
   reports: readonly [BackgroundWorkReport, ...ReadonlyArray<BackgroundWorkReport>],
-  outcome: NotificationOutcome,
 ): string {
   const [first] = reports;
   if (reports.length === 1) {
@@ -93,20 +107,30 @@ function reportsSummary(
     const noun = KIND_NOUN[first.kind][0];
     return `${noun}${label === undefined ? "" : ` "${label}"`} ${outcomeVerb(first.kind, first.outcome)}${exitSuffix(first)}`;
   }
-  const verb =
-    outcome === "failed"
-      ? "failed"
-      : outcome === "cancelled"
-        ? "were stopped"
-        : outcome === "updated"
-          ? "updated"
-          : "finished";
+  const groups = OUTCOME_GROUPS.flatMap((group) => {
+    const count = reports.filter(
+      (report) => (report.outcome === "unknown" ? "completed" : report.outcome) === group,
+    ).length;
+    return count === 0 ? [] : [{ group, count }];
+  });
   if (reports.length > 3 || reports.every((report) => reportLabel(report.label) === undefined)) {
     const kinds = new Set(reports.map((report) => report.kind));
-    const noun = kinds.size === 1 ? KIND_NOUN[first.kind][1] : "background tasks";
-    return `${reports.length} ${noun} ${verb}`;
+    const [noun, nouns] = kinds.size === 1 ? KIND_NOUN[first.kind] : KIND_NOUN.background_task;
+    return joinNames(
+      groups.map(
+        ({ group, count }, index) =>
+          `${count}${index === 0 ? ` ${count === 1 ? noun.toLowerCase() : nouns}` : ""} ${groupVerb(group, count)}`,
+      ),
+    );
+  }
+  if (groups.length > 1) {
+    return joinNames(
+      reports.map((report, index) =>
+        namedReport(report, index === 0, outcomeVerb(report.kind, report.outcome)),
+      ),
+    );
   }
-  return `${joinNames(reports.map((report, index) => namedReport(report, index === 0)))} ${verb}`;
+  return `${joinNames(reports.map((report, index) => namedReport(report, index === 0)))} ${groupVerb(groups[0]!.group, reports.length)}`;
 }
 
 function reportsSource(
@@ -141,7 +165,7 @@ export function backgroundWorkNotification(
   return {
     source: reportsSource([first, ...rest]),
     outcome,
-    summary: reportsSummary([first, ...rest], outcome),
+    summary: reportsSummary([first, ...rest]),
   };
 }