diff --git a/pkg/campaign/orchestrator.go b/pkg/campaign/orchestrator.go
index 212223511b8..9504569ef4a 100644
--- a/pkg/campaign/orchestrator.go
+++ b/pkg/campaign/orchestrator.go
@@ -405,6 +405,12 @@ func BuildOrchestrator(spec *CampaignSpec, campaignFilePath string) (*workflow.W
 		orchestratorLog.Printf("Campaign orchestrator '%s' configured with dispatch_workflow for %d workflows", spec.ID, len(spec.Workflows))
 	}
 
+	// Enable append-only comments for campaigns - create new comments instead of updating existing ones
+	// This ensures full history of campaign run updates is preserved
+	safeOutputs.Messages = &workflow.SafeOutputMessagesConfig{
+		AppendOnlyComments: true,
+	}
+
 	orchestratorLog.Printf("Campaign orchestrator '%s' built successfully with safe outputs enabled", spec.ID)
 
 	// Extract file-glob patterns from memory-paths or metrics-glob to support
diff --git a/pkg/campaign/orchestrator_test.go b/pkg/campaign/orchestrator_test.go
index 87ba41979d2..6e19cb1d080 100644
--- a/pkg/campaign/orchestrator_test.go
+++ b/pkg/campaign/orchestrator_test.go
@@ -336,6 +336,34 @@ func TestBuildOrchestrator_GovernanceOverridesSafeOutputMaxima(t *testing.T) {
 	})
 }
 
+func TestBuildOrchestrator_AppendOnlyCommentsEnabled(t *testing.T) {
+	withTempGitRepoWithInstalledCampaignPrompts(t, func(_ string) {
+		spec := &CampaignSpec{
+			ID:         "test-campaign",
+			Name:       "Test Campaign",
+			ProjectURL: "https://github.com/orgs/test/projects/1",
+			Workflows:  []string{"test-workflow"},
+		}
+
+		mdPath := ".github/workflows/test-campaign.campaign.md"
+		data, _ := BuildOrchestrator(spec, mdPath)
+		if data == nil {
+			t.Fatalf("expected non-nil WorkflowData")
+		}
+
+		// Verify that Messages configuration is present
+		if data.SafeOutputs == nil || data.SafeOutputs.Messages == nil {
+			t.Fatalf("expected SafeOutputs.Messages to be configured")
+		}
+
+		// Verify that AppendOnlyComments is enabled for campaigns
+		// This ensures campaign run updates create new comments instead of updating existing ones
+		if !data.SafeOutputs.Messages.AppendOnlyComments {
+			t.Errorf("expected AppendOnlyComments to be true for campaign orchestrator, got false")
+		}
+	})
+}
+
 func TestExtractFileGlobPatterns(t *testing.T) {
 	tests := []struct {
 		name           string