diff --git a/claudetool/bash.go b/claudetool/bash.go
index f50d4cbdadda0e165c2700adf0fb664ea8b3a66d..78d3653ddf0c8a0c86cd61e8a88de1c62f059fd0 100644
--- a/claudetool/bash.go
+++ b/claudetool/bash.go
@@ -231,6 +231,7 @@ const (
 	largeOutputThreshold = 50 * 1024 // 50KB - threshold for saving to file
 	firstLinesCount      = 2
 	lastLinesCount       = 5
+	maxLineLength        = 200 // truncate displayed lines to this length
 )
 
 func (b *BashTool) makeBashCommand(ctx context.Context, command string, out io.Writer) *exec.Cmd {
@@ -342,19 +343,27 @@ func formatForegroundBashOutput(out string) (string, error) {
 	result.WriteString("First lines:\n")
 	firstN := min(firstLinesCount, len(lines))
 	for i := 0; i < firstN; i++ {
-		result.WriteString(fmt.Sprintf("%5d: %s\n", i+1, lines[i]))
+		result.WriteString(fmt.Sprintf("%5d: %s\n", i+1, truncateLine(lines[i])))
 	}
 
 	// Last N lines
 	result.WriteString("\n...\n\nLast lines:\n")
 	startIdx := max(0, len(lines)-lastLinesCount)
 	for i := startIdx; i < len(lines); i++ {
-		result.WriteString(fmt.Sprintf("%5d: %s\n", i+1, lines[i]))
+		result.WriteString(fmt.Sprintf("%5d: %s\n", i+1, truncateLine(lines[i])))
 	}
 
 	return result.String(), nil
 }
 
+// truncateLine truncates a line to maxLineLength characters, appending "..." if truncated.
+func truncateLine(line string) string {
+	if len(line) <= maxLineLength {
+		return line
+	}
+	return line[:maxLineLength] + "..."
+}
+
 func humanizeBytes(bytes int) string {
 	switch {
 	case bytes < 4*1024:
diff --git a/claudetool/bash_test.go b/claudetool/bash_test.go
index deb5d36c5850879ec9a89d333d6c7c519dbfe490..4346a1b5b990a0201ca95702b165ecd5c3c0b36a 100644
--- a/claudetool/bash_test.go
+++ b/claudetool/bash_test.go
@@ -645,6 +645,39 @@ func TestFormatForegroundBashOutput(t *testing.T) {
 
 		t.Logf("Large binary-like output result:\n%s", result)
 	})
+
+	// Test large output with very long lines (e.g., minified JS)
+	t.Run("Large Output With Long Lines", func(t *testing.T) {
+		// Generate output > 50KB with few very long lines
+		longLine := strings.Repeat("abcdefghij", 1000) // 10KB per line
+		lines := []string{longLine, longLine, longLine, longLine, longLine, longLine}
+		largeOutput := strings.Join(lines, "\n")
+		if len(largeOutput) < largeOutputThreshold {
+			t.Fatalf("Test setup error: output is only %d bytes, need > %d", len(largeOutput), largeOutputThreshold)
+		}
+
+		result, err := formatForegroundBashOutput(largeOutput)
+		if err != nil {
+			t.Fatalf("Unexpected error: %v", err)
+		}
+
+		// Result should be reasonable size (not blow up context)
+		if len(result) > 4096 {
+			t.Errorf("Expected truncated result < 4KB, got %d bytes:\n%s", len(result), result)
+		}
+
+		// Should mention the file
+		if !strings.Contains(result, "saved to:") {
+			t.Errorf("Expected result to mention saved file, got:\n%s", result)
+		}
+
+		// Lines should be truncated
+		if !strings.Contains(result, "...") {
+			t.Errorf("Expected truncated lines with '...', got:\n%s", result)
+		}
+
+		t.Logf("Large output with long lines result:\n%s", result)
+	})
 }
 
 // waitForFile waits for a file to exist and be non-empty or times out