diff --git a/internal/ai/runtime/internal/impl/factory/agent_handler_service_test.go b/internal/ai/runtime/internal/impl/factory/agent_handler_service_test.go
new file mode 100644
index 0000000..e24b1d6
--- /dev/null
+++ b/internal/ai/runtime/internal/impl/factory/agent_handler_service_test.go
@@ -0,0 +1,46 @@
+package factory
+
+import (
+	"context"
+	"testing"
+
+	einocallbacks "cs-agent/internal/ai/runtime/internal/impl/callbacks"
+)
+
+func TestAgentHandlerServiceBuildWithCollectorOnly(t *testing.T) {
+	collector := einocallbacks.NewRuntimeTraceCollector()
+	service := NewAgentHandlerService(nil)
+
+	handlers, err := service.Build(context.Background(), BuildAgentHandlersInput{
+		Collector: collector,
+		InstructionSummary: einocallbacks.InstructionTraceSummary{
+			SectionTitles:     []string{"项目级规则", "系统治理规则"},
+			HasProjectRule:    true,
+			HasGovernanceRule: true,
+		},
+	})
+	if err != nil {
+		t.Fatalf("Build returned error: %v", err)
+	}
+	if len(handlers) != 1 {
+		t.Fatalf("expected 1 handler, got %d", len(handlers))
+	}
+	if !collector.Data.Instruction.HasProjectRule || !collector.Data.Instruction.HasGovernanceRule {
+		t.Fatalf("instruction summary was not written to collector: %#v", collector.Data.Instruction)
+	}
+	if len(collector.Data.Instruction.SectionTitles) != 2 {
+		t.Fatalf("unexpected section titles: %#v", collector.Data.Instruction.SectionTitles)
+	}
+}
+
+func TestAgentHandlerServiceBuildWithEmptyInput(t *testing.T) {
+	service := NewAgentHandlerService(nil)
+
+	handlers, err := service.Build(context.Background(), BuildAgentHandlersInput{})
+	if err != nil {
+		t.Fatalf("Build returned error: %v", err)
+	}
+	if len(handlers) != 0 {
+		t.Fatalf("expected no handlers, got %d", len(handlers))
+	}
+}
diff --git a/internal/ai/runtime/internal/impl/factory/tool_helpers_test.go b/internal/ai/runtime/internal/impl/factory/tool_helpers_test.go
new file mode 100644
index 0000000..0afa32f
--- /dev/null
+++ b/internal/ai/runtime/internal/impl/factory/tool_helpers_test.go
@@ -0,0 +1,26 @@
+package factory
+
+import (
+	"testing"
+)
+
+func TestBuildInstructionTraceSummary(t *testing.T) {
+	got := buildInstructionTraceSummary(InstructionAssemblySummary{
+		SectionTitles:     []string{"项目级规则", "当前技能上下文"},
+		HasProjectRule:    true,
+		HasGovernanceRule: true,
+		HasAgentRule:      true,
+		HasSkillRule:      true,
+		HasToolRule:       false,
+	})
+
+	if len(got.SectionTitles) != 2 {
+		t.Fatalf("unexpected section titles: %#v", got.SectionTitles)
+	}
+	if !got.HasProjectRule || !got.HasGovernanceRule || !got.HasAgentRule || !got.HasSkillRule {
+		t.Fatalf("unexpected summary flags: %#v", got)
+	}
+	if got.HasToolRule {
+		t.Fatalf("expected HasToolRule false, got %#v", got)
+	}
+}