diff --git a/docs/roadmap/remediation.md b/docs/roadmap/remediation.md
index abca3a5..9608696 100644
--- a/docs/roadmap/remediation.md
+++ b/docs/roadmap/remediation.md
@@ -2,7 +2,7 @@
 
 **Updated:** 2026-11-11
 
-**Status:** 2 of nine findings resolved. Findings refer to implementation revision
+**Status:** 3 of nine findings resolved. Findings refer to implementation revision
 `aa8073c`. See the [implementation plan](implementation.md).
 
 ## Review Result
@@ -110,6 +110,8 @@ operational error.
 
 ### R3 — Preserve Cache Settings When Replaying Repair Turns (P3)
 
+**Completed.** Replay retains each rendered instruction cache setting. The two-turn adapter test verifies the outbound role, text, and cache metadata.
+
 **Affected plan:** Stage 3, items 3–5.
 
 **Evidence:** [The adapter](../../internal/framework/llm/adapter.go#L117) appends
diff --git a/internal/framework/llm/adapter.go b/internal/framework/llm/adapter.go
index d5d9a5b..21f5861 100644
--- a/internal/framework/llm/adapter.go
+++ b/internal/framework/llm/adapter.go
@@ -123,7 +123,11 @@ func (c *RoleClient) CompleteStructured(parent context.Context, req structuredou
 		baseID, baseVars = exchange.PromptID, exchange.Variables
 		suffix = append(suffix, pk.RenderedMessage{Role: pk.RoleAssistant, Content: exchange.FinalContent})
 		for _, message := range req.Replay.Turns {
-			suffix = append(suffix, pk.RenderedMessage{Role: message.Role, Content: message.Content})
+			native := pk.RenderedMessage{Role: message.Role, Content: message.Content}
+			if cache := message.CacheControl; cache != nil {
+				native.CacheControl = &pk.CacheControl{Type: pk.CacheControlType(cache.Type), TTL: cache.TTL}
+			}
+			suffix = append(suffix, native)
 		}
 		suffix = append(suffix, instruction.Messages...)
 	}
@@ -316,6 +320,9 @@ func convertMessages(messages []pk.RenderedMessage) []structuredoutput.Message {
 	result := make([]structuredoutput.Message, len(messages))
 	for i, message := range messages {
 		result[i] = structuredoutput.Message{Role: string(message.Role), Content: message.Content}
+		if cache := message.CacheControl; cache != nil {
+			result[i].CacheControl = &structuredoutput.CacheControl{Type: string(cache.Type), TTL: cache.TTL}
+		}
 	}
 	return result
 }
diff --git a/internal/framework/llm/conversation_test.go b/internal/framework/llm/conversation_test.go
index d1eaf70..50b186f 100644
--- a/internal/framework/llm/conversation_test.go
+++ b/internal/framework/llm/conversation_test.go
@@ -157,7 +157,7 @@ func TestRoleClientCapturesAndReplaysRepairConversation(t *testing.T) {
 	dir := t.TempDir()
 	for name, content := range map[string]string{
 		"config.yml":  "version: 3\n",
-		"prompts.yml": "profiles:\n  - id: proposal\n    endpoint: https://example.invalid/v1\n    model: proposal\n  - id: repair\n    endpoint: https://example.invalid/v1\n    model: repair\n",
+		"prompts.yml": "profiles:\n  - id: proposal\n    endpoint: https://example.invalid/v1\n    model: proposal\n  - id: repair\n    endpoint: https://example.invalid/v1\n    model: repair\ncollections:\n  audita:\n    prompts:\n      - id: modules.grammar.repair\n        messages:\n          - role: user\n            content: '{{ .RepairRequestJSON }}'\n            cache_control: {type: ephemeral, ttl: 1h}\n        output:\n          format: json\n          validation_mode: json_schema\n          schema_path: correction_repair.v1.json\n",
 	} {
 		if err := os.WriteFile(filepath.Join(dir, name), []byte(content), 0644); err != nil {
 			t.Fatal(err)
@@ -167,13 +167,17 @@ func TestRoleClientCapturesAndReplaysRepairConversation(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	var messages [][]structuredoutput.Message
+	type wireMessage struct {
+		Role    string
+		Content json.RawMessage
+	}
+	var messages [][]wireMessage
 	var models []string
 	outputs := []string{`{"corrections":[]}`, `{"proposal_ref":1,"action":"revise","correction":{"id":1,"original_text":"a","corrected_text":"b","confidence":0.8}}`, `{"proposal_ref":1,"action":"withdraw","correction":null}`, `{"proposal_ref":1,"action":"withdraw","correction":null}`}
 	transport := transportFunc(func(r *http.Request) (*http.Response, error) {
 		var req struct {
-			Model    string                     `json:"model"`
-			Messages []structuredoutput.Message `json:"messages"`
+			Model    string        `json:"model"`
+			Messages []wireMessage `json:"messages"`
 		}
 		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
 			t.Fatal(err)
@@ -218,15 +222,21 @@ func TestRoleClientCapturesAndReplaysRepairConversation(t *testing.T) {
 	if !reflect.DeepEqual(models, []string{"proposal", "repair", "repair"}) {
 		t.Fatalf("models = %v", models)
 	}
-	prefix := initial.Exchange.Messages
-	if len(messages) != 3 || !reflect.DeepEqual(messages[0], prefix) || !reflect.DeepEqual(messages[1][:len(prefix)], prefix) || !reflect.DeepEqual(messages[2][:len(prefix)], prefix) {
+	prefix := messages[0]
+	if len(messages) != 3 || !reflect.DeepEqual(messages[1][:len(prefix)], prefix) || !reflect.DeepEqual(messages[2][:len(prefix)], prefix) {
 		t.Fatalf("prefixes: %+v", messages)
 	}
-	if len(messages[1]) != len(prefix)+2 || len(messages[2]) != len(prefix)+4 || messages[2][len(prefix)+2].Content != outputs[1] {
+	encodedRevision, _ := json.Marshal(outputs[1])
+	if len(messages[1]) != len(prefix)+2 || len(messages[2]) != len(prefix)+4 || string(messages[2][len(prefix)+2].Content) != string(encodedRevision) {
 		t.Fatalf("turns: %+v", messages)
 	}
+	first := messages[1][len(prefix)+1]
+	if first.Role != "user" || !strings.Contains(string(first.Content), `"ttl":"1h"`) ||
+		!strings.Contains(string(first.Content), `"text":"first"`) || !reflect.DeepEqual(first, messages[2][len(prefix)+1]) {
+		t.Fatalf("cached instruction changed during replay: first=%s replay=%s", first.Content, messages[2][len(prefix)+1].Content)
+	}
 	_, err = repair.CompleteStructured(context.Background(), structuredoutput.Request{PromptID: prompts.PromptIDModuleGrammarRepair, Schema: responseschema.CorrectionRepairKey, Variables: map[string]string{"RepairRequestJSON": "independent"}, Replay: &structuredoutput.Replay{Exchange: initial.Exchange}}, &map[string]any{})
-	if err != nil || len(messages) != 4 || len(messages[3]) != len(prefix)+2 || !strings.Contains(messages[3][len(prefix)+1].Content, "independent") {
+	if err != nil || len(messages) != 4 || len(messages[3]) != len(prefix)+2 || !strings.Contains(string(messages[3][len(prefix)+1].Content), "independent") {
 		t.Fatalf("independent branch: %v %+v", err, messages)
 	}
 	bad := *initial.Exchange
diff --git a/internal/framework/structuredoutput/call.go b/internal/framework/structuredoutput/call.go
index 27fa40c..371401a 100644
--- a/internal/framework/structuredoutput/call.go
+++ b/internal/framework/structuredoutput/call.go
@@ -81,8 +81,14 @@ type PreparedSnapshot struct {
 }
 
 type Message struct {
-	Role    string `json:"role"`
-	Content string `json:"content"`
+	Role         string        `json:"role"`
+	Content      string        `json:"content"`
+	CacheControl *CacheControl `json:"cache_control,omitempty"`
+}
+
+type CacheControl struct {
+	Type string `json:"type"`
+	TTL  string `json:"ttl,omitempty"`
 }
 
 // CallRecord brackets one logical operation, including preparation. Content