diff --git a/command/cmd.go b/command/cmd.go
index bf7ff5b..6140f21 100644
--- a/command/cmd.go
+++ b/command/cmd.go
@@ -50,7 +50,6 @@ func (r *Command) RunWith(ctx context.Context) (err error) {
 		} else {
 			r.Reporter.Succeeded(r.Path)
 		}
-		r.Reporter.End()
 	}()
 	cmd := exec.CommandContext(ctx, r.Path, r.Options...)
 	cmd.Dir = r.Dir
diff --git a/command/reporter.go b/command/reporter.go
index 7da5166..113d4d6 100644
--- a/command/reporter.go
+++ b/command/reporter.go
@@ -1,9 +1,7 @@
 package command
 
 import (
-	"fmt"
 	"strings"
-	"time"
 )
 
 //
@@ -19,15 +17,6 @@ const (
 	LiveOutput = 1
 )
 
-//
-// Rate
-const (
-	// Rate limit.
-	Rate = time.Second
-	// Depth of rate limit queue.
-	Depth = 100
-)
-
 //
 // Reporter activity reporter.
 type Reporter struct {
@@ -44,7 +33,7 @@ func (r *Reporter) Run(path string, options Options) {
 	case Error:
 	case Default,
 		LiveOutput:
-		r.report(
+		addon.Activity(
 			"[CMD] Running: %s %s",
 			path,
 			strings.Join(options, " "))
@@ -59,7 +48,7 @@ func (r *Reporter) Succeeded(path string) {
 	case Error:
 	case Default,
 		LiveOutput:
-		r.report("[CMD] %s succeeded.", path)
+		addon.Activity("[CMD] %s succeeded.", path)
 	}
 }
 
@@ -70,13 +59,13 @@ func (r *Reporter) Error(path string, err error, output []byte) {
 	case Disabled:
 	case Error,
 		Default:
-		r.report(
+		addon.Activity(
 			"[CMD] %s failed: %s.\n%s",
 			path,
 			err.Error(),
 			output)
 	case LiveOutput:
-		r.report(
+		addon.Activity(
 			"[CMD] %s failed: %s.",
 			path,
 			err.Error())
@@ -91,36 +80,6 @@ func (r *Reporter) Output(output string) {
 	case Error:
 	case Default:
 	case LiveOutput:
-		r.report("> %s", output)
-	}
-}
-
-//
-// report activity in task Report.Activity.
-// Rate limited.
-func (r *Reporter) report(entry string, v ...interface{}) {
-	if r.queue == nil {
-		r.queue = make(chan string, Depth)
-		r.done = make(chan int)
-		go func() {
-			for entry := range r.queue {
-				time.Sleep(Rate)
-				addon.Activity(entry)
-			}
-			r.done <- 1
-		}()
-	}
-	r.queue <- fmt.Sprintf(entry, v...)
-}
-
-//
-// End of reporting.
-func (r *Reporter) End() {
-	if r.queue != nil {
-		close(r.queue)
-		<-r.done
-		close(r.done)
-		r.queue = nil
-		r.done = nil
+		addon.Activity("> %s", output)
 	}
 }
diff --git a/command/writer.go b/command/writer.go
index 2aee0bd..03f0e3d 100644
--- a/command/writer.go
+++ b/command/writer.go
@@ -2,14 +2,20 @@ package command
 
 import (
 	"strings"
+	"time"
 )
 
+//
+// Rate limit.
+const Rate = time.Second
+
 //
 // Writer records command output.
 type Writer struct {
 	reporter Reporter
 	buffer   []byte
 	index    int
+	done     chan any
 }
 
 //
@@ -18,25 +24,50 @@ type Writer struct {
 func (w *Writer) Write(p []byte) (n int, err error) {
 	w.buffer = append(w.buffer, p...)
 	n = len(p)
-	batch := string(w.buffer[w.index:])
-	end := strings.LastIndex(batch, "\n")
-	if end != -1 {
-		output := batch[:end]
-		w.reporter.Output(output)
-		w.index += len(output)
-		w.index++
+	if w.done == nil {
+		w.done = make(chan any)
+		go w.report()
 	}
 	return
 }
 
 //
-// End of writing.
-// When verbosity > 0, output is reported in task Report.Activity.
-func (w *Writer) End() {
+// report in task Report.Activity.
+func (w *Writer) report() {
+	for {
+		select {
+		case <-w.done:
+			goto done
+		case <-time.After(Rate):
+		}
+		batch := string(w.buffer[w.index:])
+		end := strings.LastIndex(batch, "\n")
+		if end != -1 {
+			output := batch[:end]
+			w.reporter.Output(output)
+			w.index += len(output)
+			w.index++
+		}
+	}
+done:
 	batch := string(w.buffer[w.index:])
 	if len(batch) > 0 {
 		w.reporter.Output(batch)
 		w.index += len(batch)
 		w.index++
 	}
+	w.done <- true
+}
+
+//
+// End of writing.
+// When verbosity > 0, output is reported in task Report.Activity.
+func (w *Writer) End() {
+	if w.done == nil {
+		return
+	}
+	w.done <- true
+	<-w.done
+	close(w.done)
+	w.done = nil
 }