diff --git a/internal/modules/dnd/extract/combatturns/scriptorium_assets_test.go b/internal/modules/dnd/extract/combatturns/scriptorium_assets_test.go
index e1b3a0f..97e383c 100644
--- a/internal/modules/dnd/extract/combatturns/scriptorium_assets_test.go
+++ b/internal/modules/dnd/extract/combatturns/scriptorium_assets_test.go
@@ -62,16 +62,44 @@ func TestScriptoriumPromptPreparesRequiredInputs(t *testing.T) {
 	if prepared.PromptID != PromptID || prepared.OutputContract.SchemaPath != "dnd_combat_turns_llm.v1.json" {
 		t.Fatalf("prepared prompt = %#v, want combat prompt identity and schema", prepared)
 	}
-	for _, want := range []string{transcript, "Dana: Mira", "Mira: ranger", "Greencloak: title", `{"npcs":[]}`} {
-		found := false
-		for _, message := range prepared.Messages {
-			if strings.Contains(message.Content, want) {
-				found = true
-				break
-			}
+	for index, want := range []struct {
+		role   string
+		cached bool
+	}{
+		{role: "system"},
+		{role: "user"},
+		{role: "user", cached: true},
+		{role: "user", cached: true},
+		{role: "user", cached: true},
+		{role: "user"},
+		{role: "user", cached: true},
+		{role: "user"},
+	} {
+		if index >= len(prepared.Messages) {
+			t.Fatalf("prepared prompt has %d messages, want at least %d", len(prepared.Messages), index+1)
 		}
-		if !found {
-			t.Fatalf("prepared prompt did not render required input %q", want)
+		message := prepared.Messages[index]
+		if message.Role != want.role {
+			t.Errorf("message %d role = %q, want %q", index, message.Role, want.role)
+		}
+		if want.cached {
+			if message.CacheControl == nil || message.CacheControl.Type != scriptorium.CacheControlEphemeral {
+				t.Errorf("message %d cache control = %#v, want ephemeral", index, message.CacheControl)
+			}
+		} else if message.CacheControl != nil {
+			t.Errorf("message %d cache control = %#v, want nil", index, message.CacheControl)
 		}
 	}
+	if len(prepared.Messages) != 8 {
+		t.Fatalf("prepared prompt has %d messages, want 8", len(prepared.Messages))
+	}
+	if references := prepared.Messages[3].Content; !strings.Contains(references, "Dana: Mira") || !strings.Contains(references, "Mira: ranger") || !strings.Contains(references, "Greencloak: title") {
+		t.Fatalf("campaign references message = %q, want rendered reference inputs", references)
+	}
+	if registry := prepared.Messages[4].Content; !strings.Contains(registry, `{"npcs":[]}`) {
+		t.Fatalf("NPC registry message = %q, want registry input", registry)
+	}
+	if final := prepared.Messages[7].Content; !strings.Contains(final, transcript) {
+		t.Fatalf("final message = %q, want transcript", final)
+	}
 }
diff --git a/internal/modules/dnd/extract/npcinteractions/scriptorium_assets_test.go b/internal/modules/dnd/extract/npcinteractions/scriptorium_assets_test.go
index 135a78e..7a6f5a7 100644
--- a/internal/modules/dnd/extract/npcinteractions/scriptorium_assets_test.go
+++ b/internal/modules/dnd/extract/npcinteractions/scriptorium_assets_test.go
@@ -51,22 +51,45 @@ func TestRegisterPromptAssetsAndPrepareInteractionPrompt(t *testing.T) {
 	if prepared.PromptID != PromptID || prepared.OutputContract.SchemaPath != "dnd_npc_interactions_llm.v1.json" {
 		t.Fatalf("prepared prompt = %#v", prepared)
 	}
-	for _, want := range []string{
-		"Mira Thorn", "mentioned", "combat_opponent", "Registry content is context, not event evidence", transcript,
+	for index, want := range []struct {
+		role   string
+		cached bool
+	}{
+		{role: "system"},
+		{role: "user"},
+		{role: "user", cached: true},
+		{role: "user", cached: true},
+		{role: "user", cached: true},
+		{role: "user"},
+		{role: "user", cached: true},
+		{role: "user"},
 	} {
-		found := false
-		for _, message := range prepared.Messages {
-			if strings.Contains(message.Content, want) {
-				found = true
-				break
-			}
+		if index >= len(prepared.Messages) {
+			t.Fatalf("prepared prompt has %d messages, want at least %d", len(prepared.Messages), index+1)
 		}
-		if !found {
-			t.Fatalf("prepared prompt did not include %q", want)
+		message := prepared.Messages[index]
+		if message.Role != want.role {
+			t.Errorf("message %d role = %q, want %q", index, message.Role, want.role)
+		}
+		if want.cached {
+			if message.CacheControl == nil || message.CacheControl.Type != scriptorium.CacheControlEphemeral {
+				t.Errorf("message %d cache control = %#v, want ephemeral", index, message.CacheControl)
+			}
+		} else if message.CacheControl != nil {
+			t.Errorf("message %d cache control = %#v, want nil", index, message.CacheControl)
 		}
 	}
-	if last := prepared.Messages[len(prepared.Messages)-1]; !strings.Contains(last.Content, transcript) {
-		t.Fatalf("last prompt message = %q, want transcript", last.Content)
+	if len(prepared.Messages) != 8 {
+		t.Fatalf("prepared prompt has %d messages, want 8", len(prepared.Messages))
+	}
+	if references := prepared.Messages[3].Content; !strings.Contains(references, "Dana: Mira") || !strings.Contains(references, "Mira: ranger") || !strings.Contains(references, "Greencloak: title") {
+		t.Fatalf("campaign references message = %q, want rendered reference inputs", references)
+	}
+	if registry := prepared.Messages[4].Content; !strings.Contains(registry, `{"npcs":[{"name":"Mira Thorn"}]}`) {
+		t.Fatalf("NPC registry message = %q, want names-only registry input", registry)
+	}
+	if final := prepared.Messages[7].Content; !strings.Contains(final, transcript) {
+		t.Fatalf("final message = %q, want transcript", final)
 	}
 }
 
diff --git a/internal/modules/dnd/extract/npcs/scriptorium_assets_test.go b/internal/modules/dnd/extract/npcs/scriptorium_assets_test.go
index 97a3203..e22047c 100644
--- a/internal/modules/dnd/extract/npcs/scriptorium_assets_test.go
+++ b/internal/modules/dnd/extract/npcs/scriptorium_assets_test.go
@@ -42,17 +42,41 @@ func TestRegisterPromptAssetsAndPrepareNPCPrompt(t *testing.T) {
 	if prepared.PromptID != PromptID || prepared.OutputContract.SchemaPath != "dnd_npcs_llm.v1.json" {
 		t.Fatalf("prepared prompt = %#v, want NPC prompt identity and wiring", prepared)
 	}
-	for _, want := range []string{`{"units":[1]}`, "Dana: Mira", "Mira: ranger", "Greencloak: title"} {
-		found := false
-		for _, message := range prepared.Messages {
-			if strings.Contains(message.Content, want) {
-				found = true
-				break
+	for index, want := range []struct {
+		role   string
+		cached bool
+	}{
+		{role: "system"},
+		{role: "user"},
+		{role: "user", cached: true},
+		{role: "user", cached: true},
+		{role: "user"},
+		{role: "user", cached: true},
+		{role: "user"},
+	} {
+		if index >= len(prepared.Messages) {
+			t.Fatalf("prepared prompt has %d messages, want at least %d", len(prepared.Messages), index+1)
+		}
+		message := prepared.Messages[index]
+		if message.Role != want.role {
+			t.Errorf("message %d role = %q, want %q", index, message.Role, want.role)
+		}
+		if want.cached {
+			if message.CacheControl == nil || message.CacheControl.Type != scriptorium.CacheControlEphemeral {
+				t.Errorf("message %d cache control = %#v, want ephemeral", index, message.CacheControl)
 			}
+		} else if message.CacheControl != nil {
+			t.Errorf("message %d cache control = %#v, want nil", index, message.CacheControl)
 		}
-		if !found {
-			t.Fatalf("prepared prompt did not render required input %q", want)
-		}
+	}
+	if len(prepared.Messages) != 7 {
+		t.Fatalf("prepared prompt has %d messages, want 7", len(prepared.Messages))
+	}
+	if references := prepared.Messages[3].Content; !strings.Contains(references, "Dana: Mira") || !strings.Contains(references, "Mira: ranger") || !strings.Contains(references, "Greencloak: title") {
+		t.Fatalf("campaign references message = %q, want rendered reference inputs", references)
+	}
+	if transcript := prepared.Messages[6].Content; !strings.Contains(transcript, `{"units":[1]}`) {
+		t.Fatalf("final message = %q, want transcript", transcript)
 	}
 	transcriptMessages := 0
 	for _, message := range prepared.Messages {
diff --git a/internal/modules/dnd/extract/spells/scriptorium_assets_test.go b/internal/modules/dnd/extract/spells/scriptorium_assets_test.go
index 9bbfd86..2b77956 100644
--- a/internal/modules/dnd/extract/spells/scriptorium_assets_test.go
+++ b/internal/modules/dnd/extract/spells/scriptorium_assets_test.go
@@ -21,24 +21,49 @@ func TestScriptoriumPromptPreparesTranscriptReferencesAndTaskMessages(t *testing
 	if prepared.OutputContract.SchemaPath != "dnd_spells_llm.v1.json" {
 		t.Fatalf("schema path = %q, want LLM-only schema", prepared.OutputContract.SchemaPath)
 	}
-	for _, want := range []string{
-		string(transcript),
-		"Dana: Mira",
-		"Mira: wizard",
-		"Shield: abjuration",
-		`{"spell_names":["Cure Wounds"]}`,
-		`{"npcs":[]}`,
+	for index, want := range []struct {
+		role   string
+		cached bool
+	}{
+		{role: "system"},
+		{role: "user"},
+		{role: "user", cached: true},
+		{role: "user", cached: true},
+		{role: "user", cached: true},
+		{role: "user"},
+		{role: "user"},
+		{role: "user", cached: true},
+		{role: "user"},
 	} {
-		found := false
-		for _, message := range prepared.Messages {
-			if strings.Contains(message.Content, want) {
-				found = true
-				break
+		if index >= len(prepared.Messages) {
+			t.Fatalf("prepared prompt has %d messages, want at least %d", len(prepared.Messages), index+1)
+		}
+		message := prepared.Messages[index]
+		if message.Role != want.role {
+			t.Errorf("message %d role = %q, want %q", index, message.Role, want.role)
+		}
+		if want.cached {
+			if message.CacheControl == nil || message.CacheControl.Type != scriptorium.CacheControlEphemeral {
+				t.Errorf("message %d cache control = %#v, want ephemeral", index, message.CacheControl)
 			}
+		} else if message.CacheControl != nil {
+			t.Errorf("message %d cache control = %#v, want nil", index, message.CacheControl)
 		}
-		if !found {
-			t.Fatalf("prepared prompt did not render required input %q", want)
-		}
+	}
+	if len(prepared.Messages) != 9 {
+		t.Fatalf("prepared prompt has %d messages, want 9", len(prepared.Messages))
+	}
+	if references := prepared.Messages[3].Content; !strings.Contains(references, "Dana: Mira") || !strings.Contains(references, "Mira: wizard") || !strings.Contains(references, "Shield: abjuration") {
+		t.Fatalf("campaign references message = %q, want rendered reference inputs", references)
+	}
+	if registry := prepared.Messages[4].Content; !strings.Contains(registry, `{"npcs":[]}`) {
+		t.Fatalf("NPC registry message = %q, want registry input", registry)
+	}
+	if catalog := prepared.Messages[5].Content; !strings.Contains(catalog, `{"spell_names":["Cure Wounds"]}`) {
+		t.Fatalf("spell catalog message = %q, want catalog input", catalog)
+	}
+	if final := prepared.Messages[8].Content; !strings.Contains(final, string(transcript)) {
+		t.Fatalf("final message = %q, want transcript", final)
 	}
 }