Add thread rename support

internal/codexapp/client.go

@@ -224,6 +224,17 @@ func (c *Client) ArchiveThread(ctx context.Context, threadID string) error {
 	return c.call(ctx, "thread/archive", map[string]any{"threadId": threadID}, &ignored)
 }
 
+func (c *Client) SetThreadName(ctx context.Context, threadID, name string) error {
+	if err := c.EnsureConnected(ctx); err != nil {
+		return err
+	}
+	var ignored json.RawMessage
+	return c.call(ctx, "thread/setName", map[string]any{
+		"threadId": threadID,
+		"name":     name,
+	}, &ignored)
+}
+
 func (c *Client) StartTurn(ctx context.Context, threadID, cwd, model, reasoningEffort, sandbox string, input []InputItem) (Turn, error) {
 	if err := c.EnsureConnected(ctx); err != nil {
 		return Turn{}, err

internal/codexapp/client_test.go

@@ -86,6 +86,26 @@ func TestClientWebSocketUnixJSONRPC(t *testing.T) {
 			return
 		}
 
+		var setName map[string]any
+		if err := conn.ReadJSON(&setName); err != nil {
+			serverDone <- err
+			return
+		}
+		if setName["method"] != "thread/setName" {
+			serverDone <- unexpectedMessage("thread/setName", setName["method"])
+			return
+		}
+		params := setName["params"].(map[string]any)
+		if params["threadId"] != "thr_1" || params["name"] != "Short title" {
+			payload, _ := json.Marshal(params)
+			serverDone <- unexpectedMessage("thread/setName params", string(payload))
+			return
+		}
+		if err := conn.WriteJSON(map[string]any{"id": setName["id"], "result": map[string]any{}}); err != nil {
+			serverDone <- err
+			return
+		}
+
 		var response map[string]any
 		if err := conn.ReadJSON(&response); err != nil {
 			serverDone <- err
@@ -125,6 +145,9 @@ func TestClientWebSocketUnixJSONRPC(t *testing.T) {
 	if thread.ID != "thr_1" {
 		t.Fatalf("unexpected thread: %+v", thread)
 	}
+	if err := client.SetThreadName(ctx, "thr_1", "Short title"); err != nil {
+		t.Fatal(err)
+	}
 	if err := client.RespondServerRequest(ctx, 99, "accept"); err != nil {
 		t.Fatal(err)
 	}