diff --git a/README.md b/README.md
index 6e759f2..7e9f4c7 100644
--- a/README.md
+++ b/README.md
@@ -107,13 +107,13 @@ Tool calls remain compact in the conversation. Expand a tool result with Pi's no
 
 ## Herdr Integration
 
-When Pi runs inside Herdr, the extension reports the most specific `in-progress` task as a `task` pane metadata token. If nothing is in progress, it falls back to a blocked task. Parallel current tasks use a separate `task_count` token so Herdr can truncate long task names responsively while keeping the remaining count visible, for example `#7 Implement auth · +2`.
+When Pi runs inside Herdr, the extension reports the most specific `in-progress` task as a `task` pane metadata token. If nothing is in progress, it falls back to a blocked task. Parallel current tasks use a separate `task_count` token so Herdr can truncate long task names responsively while keeping the remaining count visible, for example `#7 Implement auth · +2`. The `task_progress` token reports aggregate completion as `done/total`, including `N/N` when all tasks are complete.
 
-Add `$task` and `$task_count` to the same Herdr agent sidebar row in `~/.config/herdr/config.toml`:
+Add `$task`, `$task_count`, and `$task_progress` to the Herdr agent sidebar in `~/.config/herdr/config.toml`:
 
 ```toml
 [ui.sidebar.agents]
-rows = [["state_icon", "workspace", "tab"], ["agent", "$ask", "$ask_count"], ["$task", "$task_count"]]
+rows = [["state_icon", "workspace", "tab"], ["$ask", "$ask_count"], ["$task_progress", "$task", "$task_count"]]
 ```
 
 Apply the change to a running Herdr server:
diff --git a/src/herdr.ts b/src/herdr.ts
index f78bfe9..c9a6259 100644
--- a/src/herdr.ts
+++ b/src/herdr.ts
@@ -1,10 +1,11 @@
 import net from "node:net";
 import type { Task } from "./types.ts";
-import { orderedTreeRows } from "./ui.ts";
+import { orderedTreeRows, snapshotStats } from "./ui.ts";
 
 const SOURCE = "pi-todo-herdr";
 const TASK_TOKEN = "task";
 const COUNT_TOKEN = "task_count";
+const PROGRESS_TOKEN = "task_progress";
 let reportSeq = Date.now() * 1000;
 
 function nextSeq(): number {
@@ -27,6 +28,7 @@ function hasDescendantWithStatus(task: Task, status: Task["status"], byId: Map<n
 
 export function currentTaskTokens(tasks: Task[]): Record<string, string | null> {
   const byId = new Map(tasks.map((task) => [task.id, task]));
+  const stats = snapshotStats(tasks);
   const ordered = orderedTreeRows(tasks).map(({ task }) => task);
   const inProgress = ordered.filter(
     (task) => task.status === "in-progress" && !hasDescendantWithStatus(task, "in-progress", byId),
@@ -38,6 +40,7 @@ export function currentTaskTokens(tasks: Task[]): Record<string, string | null>
   return {
     [TASK_TOKEN]: candidates.length > 0 ? `#${candidates[0]!.id} ${candidates[0]!.name}` : null,
     [COUNT_TOKEN]: candidates.length > 1 ? `+${candidates.length - 1}` : null,
+    [PROGRESS_TOKEN]: stats.total > 0 ? `${stats.done}/${stats.total}` : null,
   };
 }
 
@@ -97,5 +100,5 @@ export function reportCurrentTask(tasks: Task[]): Promise<void> {
 }
 
 export function clearCurrentTask(): Promise<void> {
-  return reportTokens({ [TASK_TOKEN]: null, [COUNT_TOKEN]: null });
+  return reportTokens({ [TASK_TOKEN]: null, [COUNT_TOKEN]: null, [PROGRESS_TOKEN]: null });
 }
diff --git a/tests/ui.test.ts b/tests/ui.test.ts
index 11a5dec..894b4d5 100644
--- a/tests/ui.test.ts
+++ b/tests/ui.test.ts
@@ -122,7 +122,11 @@ test("selects the most specific in-progress task and compresses parallel leaves"
     { name: "Parallel", description: "Parallel", status: "in-progress" },
   ]);
   assert.equal(currentTaskLabel(state.list()), "#2 Child +1");
-  assert.deepEqual(currentTaskTokens(state.list()), { task: "#2 Child", task_count: "+1" });
+  assert.deepEqual(currentTaskTokens(state.list()), {
+    task: "#2 Child",
+    task_count: "+1",
+    task_progress: "0/3",
+  });
 });
 
 test("uses blocked tasks only when nothing is in progress", () => {
@@ -132,10 +136,26 @@ test("uses blocked tasks only when nothing is in progress", () => {
     { name: "Blocked two", description: "Two", status: "blocked" },
   ]);
   assert.equal(currentTaskLabel(state.list()), "#1 Blocked one +1");
-  assert.deepEqual(currentTaskTokens(state.list()), { task: "#1 Blocked one", task_count: "+1" });
+  assert.deepEqual(currentTaskTokens(state.list()), {
+    task: "#1 Blocked one",
+    task_count: "+1",
+    task_progress: "0/2",
+  });
   state.update([{ id: 1, status: "done" }, { id: 2, status: "done" }]);
   assert.equal(currentTaskLabel(state.list()), null);
-  assert.deepEqual(currentTaskTokens(state.list()), { task: null, task_count: null });
+  assert.deepEqual(currentTaskTokens(state.list()), {
+    task: null,
+    task_count: null,
+    task_progress: "2/2",
+  });
+});
+
+test("clears sidebar progress for an empty task tree", () => {
+  assert.deepEqual(currentTaskTokens([]), {
+    task: null,
+    task_count: null,
+    task_progress: null,
+  });
 });
 
 test("hides an empty widget and renders a populated one", () => {