diff --git a/dist/index.js b/dist/index.js
index 4bc2c64..2319ae8 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -27782,16 +27782,36 @@ function buildMarkdown(title, reports) {
       lines.push("</details>", "");
     }
   }
-  lines.push("### All tests", "");
-  lines.push("| Status | Test | Time |");
-  lines.push("|--------|------|------|");
-  for (const c of all) {
-    const icon = statusIcon(c.status);
-    const name = c.classname ? `${c.classname} \u203A ${c.name}` : c.name;
-    lines.push(`| ${icon} | ${escapeMd(name)} | ${c.time.toFixed(3)}s |`);
+  if (failed === 0) {
+    lines.push("### All tests", "");
+    lines.push("| Class | Tests | Time |");
+    lines.push("|-------|-------|------|");
+    for (const { classname, count, time } of groupByClass(all)) {
+      lines.push(`| ${escapeMd(classname)} | ${count} | ${time.toFixed(3)}s |`);
+    }
+  } else {
+    lines.push("### All tests", "");
+    lines.push("| Status | Test | Time |");
+    lines.push("|--------|------|------|");
+    for (const c of all) {
+      const icon = statusIcon(c.status);
+      const name = c.classname ? `${c.classname} \u203A ${c.name}` : c.name;
+      lines.push(`| ${icon} | ${escapeMd(name)} | ${c.time.toFixed(3)}s |`);
+    }
   }
   return lines.join("\n") + "\n";
 }
+function groupByClass(cases) {
+  const groups = /* @__PURE__ */ new Map();
+  for (const c of cases) {
+    const key = c.classname || c.name;
+    const g = groups.get(key) ?? { count: 0, time: 0 };
+    g.count += 1;
+    g.time += c.time;
+    groups.set(key, g);
+  }
+  return [...groups.entries()].map(([classname, g]) => ({ classname, ...g })).sort((a, b) => a.classname.localeCompare(b.classname));
+}
 function statusIcon(s) {
   switch (s) {
     case "passed":
diff --git a/src/main.test.ts b/src/main.test.ts
index 0242000..645ed8a 100644
--- a/src/main.test.ts
+++ b/src/main.test.ts
@@ -90,6 +90,15 @@ test("buildMarkdown: summarizes mixed results with failure detail blocks", () =>
 	assert.match(md, /\|\s*:fast_forward:\s*\|/);
 });
 
+test("buildMarkdown: collapses to a per-class summary when everything passes", () => {
+	const xml = fs.readFileSync(path.join(fixtures, "passing.xml"), "utf8");
+	const cases = parseJunitXml(xml);
+	const md = buildMarkdown("Unit tests", [{ file: "passing.xml", cases }]);
+	assert.match(md, /### All tests/);
+	assert.match(md, /\| Class \| Tests \| Time \|/);
+	assert.doesNotMatch(md, /:white_check_mark:/);
+});
+
 test("run: end-to-end over fixtures produces summary, outputs, and annotations", async () => {
 	const outputs: Record<string, string> = {};
 	const logLines: string[] = [];
diff --git a/src/main.ts b/src/main.ts
index 567f50b..ea8bfe8 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -199,17 +199,42 @@ export function buildMarkdown(title: string, reports: ParsedReport[]): string {
 		}
 	}
 
-	lines.push("### All tests", "");
-	lines.push("| Status | Test | Time |");
-	lines.push("|--------|------|------|");
-	for (const c of all) {
-		const icon = statusIcon(c.status);
-		const name = c.classname ? `${c.classname} › ${c.name}` : c.name;
-		lines.push(`| ${icon} | ${escapeMd(name)} | ${c.time.toFixed(3)}s |`);
+	if (failed === 0) {
+		lines.push("### All tests", "");
+		lines.push("| Class | Tests | Time |");
+		lines.push("|-------|-------|------|");
+		for (const { classname, count, time } of groupByClass(all)) {
+			lines.push(`| ${escapeMd(classname)} | ${count} | ${time.toFixed(3)}s |`);
+		}
+	} else {
+		lines.push("### All tests", "");
+		lines.push("| Status | Test | Time |");
+		lines.push("|--------|------|------|");
+		for (const c of all) {
+			const icon = statusIcon(c.status);
+			const name = c.classname ? `${c.classname} › ${c.name}` : c.name;
+			lines.push(`| ${icon} | ${escapeMd(name)} | ${c.time.toFixed(3)}s |`);
+		}
 	}
 	return lines.join("\n") + "\n";
 }
 
+function groupByClass(
+	cases: TestCase[],
+): { classname: string; count: number; time: number }[] {
+	const groups = new Map<string, { count: number; time: number }>();
+	for (const c of cases) {
+		const key = c.classname || c.name;
+		const g = groups.get(key) ?? { count: 0, time: 0 };
+		g.count += 1;
+		g.time += c.time;
+		groups.set(key, g);
+	}
+	return [...groups.entries()]
+		.map(([classname, g]) => ({ classname, ...g }))
+		.sort((a, b) => a.classname.localeCompare(b.classname));
+}
+
 function statusIcon(s: TestCase["status"]): string {
 	switch (s) {
 		case "passed":