diff --git a/go.mod b/go.mod
index b423b8b..5cbad9b 100644
--- a/go.mod
+++ b/go.mod
@@ -9,6 +9,7 @@ require (
 	github.com/google/uuid v1.6.0
 	github.com/jackc/pgx/v5 v5.8.0
 	github.com/mattn/go-sqlite3 v1.14.34
+	github.com/openai/openai-go v1.12.0
 	github.com/openai/openai-go/v3 v3.2.0
 	github.com/redis/go-redis/v9 v9.18.0
 	google.golang.org/genai v1.48.0
diff --git a/go.sum b/go.sum
index f71fd69..0d5eb0f 100644
--- a/go.sum
+++ b/go.sum
@@ -91,6 +91,8 @@ github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/mattn/go-sqlite3 v1.14.34 h1:3NtcvcUnFBPsuRcno8pUtupspG/GM+9nZ88zgJcp6Zk=
 github.com/mattn/go-sqlite3 v1.14.34/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
+github.com/openai/openai-go v1.12.0 h1:NBQCnXzqOTv5wsgNC36PrFEiskGfO5wccfCWDo9S1U0=
+github.com/openai/openai-go v1.12.0/go.mod h1:g461MYGXEXBVdV5SaR/5tNzNbSfwTBBefwc+LlDCK0Y=
 github.com/openai/openai-go/v3 v3.2.0 h1:2AbqFUCsoW2pm/2pUtPRuwK89dnoGHaQokzWsfoQO/U=
 github.com/openai/openai-go/v3 v3.2.0/go.mod h1:UOpNxkqC9OdNXNUfpNByKOtB4jAL0EssQXq5p8gO0Xs=
 github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c h1:+mdjkGKdHQG3305AYmdv1U2eRNDiU2ErMBj1gwrq8eQ=
diff --git a/internal/conversation/conversation.go b/internal/conversation/conversation.go
index eec1e2b..ff757c8 100644
--- a/internal/conversation/conversation.go
+++ b/internal/conversation/conversation.go
@@ -9,10 +9,10 @@ import (
 
 // Store defines the interface for conversation storage backends.
 type Store interface {
-	Get(id string) (*Conversation, bool)
-	Create(id string, model string, messages []api.Message) *Conversation
-	Append(id string, messages ...api.Message) (*Conversation, bool)
-	Delete(id string)
+	Get(id string) (*Conversation, error)
+	Create(id string, model string, messages []api.Message) (*Conversation, error)
+	Append(id string, messages ...api.Message) (*Conversation, error)
+	Delete(id string) error
 	Size() int
 }
 
@@ -47,55 +47,93 @@ func NewMemoryStore(ttl time.Duration) *MemoryStore {
 	return s
 }
 
-// Get retrieves a conversation by ID.
-func (s *MemoryStore) Get(id string) (*Conversation, bool) {
+// Get retrieves a conversation by ID. Returns a deep copy to prevent data races.
+func (s *MemoryStore) Get(id string) (*Conversation, error) {
 	s.mu.RLock()
 	defer s.mu.RUnlock()
-	
+
 	conv, ok := s.conversations[id]
-	return conv, ok
+	if !ok {
+		return nil, nil
+	}
+
+	// Return a deep copy to prevent data races
+	msgsCopy := make([]api.Message, len(conv.Messages))
+	copy(msgsCopy, conv.Messages)
+
+	return &Conversation{
+		ID:        conv.ID,
+		Messages:  msgsCopy,
+		Model:     conv.Model,
+		CreatedAt: conv.CreatedAt,
+		UpdatedAt: conv.UpdatedAt,
+	}, nil
 }
 
 // Create creates a new conversation with the given messages.
-func (s *MemoryStore) Create(id string, model string, messages []api.Message) *Conversation {
+func (s *MemoryStore) Create(id string, model string, messages []api.Message) (*Conversation, error) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
-	
+
 	now := time.Now()
+
+	// Store a copy to prevent external modifications
+	msgsCopy := make([]api.Message, len(messages))
+	copy(msgsCopy, messages)
+
 	conv := &Conversation{
+		ID:        id,
+		Messages:  msgsCopy,
+		Model:     model,
+		CreatedAt: now,
+		UpdatedAt: now,
+	}
+
+	s.conversations[id] = conv
+
+	// Return a copy
+	return &Conversation{
 		ID:        id,
 		Messages:  messages,
 		Model:     model,
 		CreatedAt: now,
 		UpdatedAt: now,
-	}
-	
-	s.conversations[id] = conv
-	return conv
+	}, nil
 }
 
 // Append adds new messages to an existing conversation.
-func (s *MemoryStore) Append(id string, messages ...api.Message) (*Conversation, bool) {
+func (s *MemoryStore) Append(id string, messages ...api.Message) (*Conversation, error) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
-	
+
 	conv, ok := s.conversations[id]
 	if !ok {
-		return nil, false
+		return nil, nil
 	}
-	
+
 	conv.Messages = append(conv.Messages, messages...)
 	conv.UpdatedAt = time.Now()
-	
-	return conv, true
+
+	// Return a deep copy
+	msgsCopy := make([]api.Message, len(conv.Messages))
+	copy(msgsCopy, conv.Messages)
+
+	return &Conversation{
+		ID:        conv.ID,
+		Messages:  msgsCopy,
+		Model:     conv.Model,
+		CreatedAt: conv.CreatedAt,
+		UpdatedAt: conv.UpdatedAt,
+	}, nil
 }
 
 // Delete removes a conversation from the store.
-func (s *MemoryStore) Delete(id string) {
+func (s *MemoryStore) Delete(id string) error {
 	s.mu.Lock()
 	defer s.mu.Unlock()
-	
+
 	delete(s.conversations, id)
+	return nil
 }
 
 // cleanup periodically removes expired conversations.
diff --git a/internal/conversation/redis_store.go b/internal/conversation/redis_store.go
index 73b0cc1..5c96ba2 100644
--- a/internal/conversation/redis_store.go
+++ b/internal/conversation/redis_store.go
@@ -31,22 +31,25 @@ func (s *RedisStore) key(id string) string {
 }
 
 // Get retrieves a conversation by ID from Redis.
-func (s *RedisStore) Get(id string) (*Conversation, bool) {
+func (s *RedisStore) Get(id string) (*Conversation, error) {
 	data, err := s.client.Get(s.ctx, s.key(id)).Bytes()
+	if err == redis.Nil {
+		return nil, nil
+	}
 	if err != nil {
-		return nil, false
+		return nil, err
 	}
 
 	var conv Conversation
 	if err := json.Unmarshal(data, &conv); err != nil {
-		return nil, false
+		return nil, err
 	}
 
-	return &conv, true
+	return &conv, nil
 }
 
 // Create creates a new conversation with the given messages.
-func (s *RedisStore) Create(id string, model string, messages []api.Message) *Conversation {
+func (s *RedisStore) Create(id string, model string, messages []api.Message) (*Conversation, error) {
 	now := time.Now()
 	conv := &Conversation{
 		ID:        id,
@@ -56,31 +59,46 @@ func (s *RedisStore) Create(id string, model string, messages []api.Message) *Co
 		UpdatedAt: now,
 	}
 
-	data, _ := json.Marshal(conv)
-	_ = s.client.Set(s.ctx, s.key(id), data, s.ttl).Err()
+	data, err := json.Marshal(conv)
+	if err != nil {
+		return nil, err
+	}
 
-	return conv
+	if err := s.client.Set(s.ctx, s.key(id), data, s.ttl).Err(); err != nil {
+		return nil, err
+	}
+
+	return conv, nil
 }
 
 // Append adds new messages to an existing conversation.
-func (s *RedisStore) Append(id string, messages ...api.Message) (*Conversation, bool) {
-	conv, ok := s.Get(id)
-	if !ok {
-		return nil, false
+func (s *RedisStore) Append(id string, messages ...api.Message) (*Conversation, error) {
+	conv, err := s.Get(id)
+	if err != nil {
+		return nil, err
+	}
+	if conv == nil {
+		return nil, nil
 	}
 
 	conv.Messages = append(conv.Messages, messages...)
 	conv.UpdatedAt = time.Now()
 
-	data, _ := json.Marshal(conv)
-	_ = s.client.Set(s.ctx, s.key(id), data, s.ttl).Err()
+	data, err := json.Marshal(conv)
+	if err != nil {
+		return nil, err
+	}
 
-	return conv, true
+	if err := s.client.Set(s.ctx, s.key(id), data, s.ttl).Err(); err != nil {
+		return nil, err
+	}
+
+	return conv, nil
 }
 
 // Delete removes a conversation from Redis.
-func (s *RedisStore) Delete(id string) {
-	_ = s.client.Del(s.ctx, s.key(id)).Err()
+func (s *RedisStore) Delete(id string) error {
+	return s.client.Del(s.ctx, s.key(id)).Err()
 }
 
 // Size returns the number of active conversations in Redis.
diff --git a/internal/conversation/sql_store.go b/internal/conversation/sql_store.go
index 4862b79..d1a7e84 100644
--- a/internal/conversation/sql_store.go
+++ b/internal/conversation/sql_store.go
@@ -65,28 +65,36 @@ func NewSQLStore(db *sql.DB, driver string, ttl time.Duration) (*SQLStore, error
 	return s, nil
 }
 
-func (s *SQLStore) Get(id string) (*Conversation, bool) {
+func (s *SQLStore) Get(id string) (*Conversation, error) {
 	row := s.db.QueryRow(s.dialect.getByID, id)
 
 	var conv Conversation
 	var msgJSON string
 	err := row.Scan(&conv.ID, &conv.Model, &msgJSON, &conv.CreatedAt, &conv.UpdatedAt)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
 	if err != nil {
-		return nil, false
+		return nil, err
 	}
 
 	if err := json.Unmarshal([]byte(msgJSON), &conv.Messages); err != nil {
-		return nil, false
+		return nil, err
 	}
 
-	return &conv, true
+	return &conv, nil
 }
 
-func (s *SQLStore) Create(id string, model string, messages []api.Message) *Conversation {
+func (s *SQLStore) Create(id string, model string, messages []api.Message) (*Conversation, error) {
 	now := time.Now()
-	msgJSON, _ := json.Marshal(messages)
+	msgJSON, err := json.Marshal(messages)
+	if err != nil {
+		return nil, err
+	}
 
-	_, _ = s.db.Exec(s.dialect.upsert, id, model, string(msgJSON), now, now)
+	if _, err := s.db.Exec(s.dialect.upsert, id, model, string(msgJSON), now, now); err != nil {
+		return nil, err
+	}
 
 	return &Conversation{
 		ID:        id,
@@ -94,26 +102,36 @@ func (s *SQLStore) Create(id string, model string, messages []api.Message) *Conv
 		Model:     model,
 		CreatedAt: now,
 		UpdatedAt: now,
-	}
+	}, nil
 }
 
-func (s *SQLStore) Append(id string, messages ...api.Message) (*Conversation, bool) {
-	conv, ok := s.Get(id)
-	if !ok {
-		return nil, false
+func (s *SQLStore) Append(id string, messages ...api.Message) (*Conversation, error) {
+	conv, err := s.Get(id)
+	if err != nil {
+		return nil, err
+	}
+	if conv == nil {
+		return nil, nil
 	}
 
 	conv.Messages = append(conv.Messages, messages...)
 	conv.UpdatedAt = time.Now()
 
-	msgJSON, _ := json.Marshal(conv.Messages)
-	_, _ = s.db.Exec(s.dialect.update, string(msgJSON), conv.UpdatedAt, id)
+	msgJSON, err := json.Marshal(conv.Messages)
+	if err != nil {
+		return nil, err
+	}
 
-	return conv, true
+	if _, err := s.db.Exec(s.dialect.update, string(msgJSON), conv.UpdatedAt, id); err != nil {
+		return nil, err
+	}
+
+	return conv, nil
 }
 
-func (s *SQLStore) Delete(id string) {
-	_, _ = s.db.Exec(s.dialect.deleteByID, id)
+func (s *SQLStore) Delete(id string) error {
+	_, err := s.db.Exec(s.dialect.deleteByID, id)
+	return err
 }
 
 func (s *SQLStore) Size() int {
diff --git a/internal/server/server.go b/internal/server/server.go
index b581201..1eff7c8 100644
--- a/internal/server/server.go
+++ b/internal/server/server.go
@@ -84,8 +84,13 @@ func (s *GatewayServer) handleResponses(w http.ResponseWriter, r *http.Request)
 	// Build full message history from previous conversation
 	var historyMsgs []api.Message
 	if req.PreviousResponseID != nil && *req.PreviousResponseID != "" {
-		conv, ok := s.convs.Get(*req.PreviousResponseID)
-		if !ok {
+		conv, err := s.convs.Get(*req.PreviousResponseID)
+		if err != nil {
+			s.logger.Printf("error retrieving conversation: %v", err)
+			http.Error(w, "error retrieving conversation", http.StatusInternalServerError)
+			return
+		}
+		if conv == nil {
 			http.Error(w, "conversation not found", http.StatusNotFound)
 			return
 		}
@@ -140,7 +145,10 @@ func (s *GatewayServer) handleSyncResponse(w http.ResponseWriter, r *http.Reques
 		Content: []api.ContentBlock{{Type: "output_text", Text: result.Text}},
 	}
 	allMsgs := append(storeMsgs, assistantMsg)
-	s.convs.Create(responseID, result.Model, allMsgs)
+	if _, err := s.convs.Create(responseID, result.Model, allMsgs); err != nil {
+		s.logger.Printf("error storing conversation: %v", err)
+		// Don't fail the response if storage fails
+	}
 
 	// Build spec-compliant response
 	resp := s.buildResponse(origReq, result, provider.Name(), responseID)
@@ -458,7 +466,10 @@ loop:
 			Content: []api.ContentBlock{{Type: "output_text", Text: fullText}},
 		}
 		allMsgs := append(storeMsgs, assistantMsg)
-		s.convs.Create(responseID, model, allMsgs)
+		if _, err := s.convs.Create(responseID, model, allMsgs); err != nil {
+			s.logger.Printf("error storing conversation: %v", err)
+			// Don't fail the response if storage fails
+		}
 	}
 }