diff --git a/components/openthread/src/esp_openthread_cli.c b/components/openthread/src/esp_openthread_cli.c
index 27c6b3cefc3..50f90d53c38 100644
--- a/components/openthread/src/esp_openthread_cli.c
+++ b/components/openthread/src/esp_openthread_cli.c
@@ -35,15 +35,17 @@ static bool append_escaped_ot_arg(char *buffer, size_t buffer_size, const char *
     ESP_RETURN_ON_FALSE(rem_size > 0, false, OT_PLAT_LOG_TAG, "CLI command buffer is full");
 
     while (*arg) {
-        if ((*arg == ' ') || (*arg == '\t') || (*arg == '\r') || (*arg == '\n') || (*arg == '\\')) {
-            ESP_RETURN_ON_FALSE(rem_size > 1, false, OT_PLAT_LOG_TAG, "CLI command is too long");
+        bool need_escape = (*arg == ' ') || (*arg == '\t') || (*arg == '\r') || (*arg == '\n') || (*arg == '\\');
+        size_t need = need_escape ? 2 : 1;
+
+        ESP_RETURN_ON_FALSE(rem_size >= need, false, OT_PLAT_LOG_TAG, "CLI command is too long");
+
+        if (need_escape) {
             buffer[len++] = '\\';
-            rem_size--;
         }
 
-        ESP_RETURN_ON_FALSE(rem_size > 1, false, OT_PLAT_LOG_TAG, "CLI command is too long");
         buffer[len++] = *arg++;
-        rem_size--;
+        rem_size -= need;
     }
 
     buffer[len] = '\0';
diff --git a/components/openthread/src/port/esp_openthread_radio_spinel.cpp b/components/openthread/src/port/esp_openthread_radio_spinel.cpp
index b7892da9afa..5978d154210 100644
--- a/components/openthread/src/port/esp_openthread_radio_spinel.cpp
+++ b/components/openthread/src/port/esp_openthread_radio_spinel.cpp
@@ -53,7 +53,9 @@ static otRadioCaps s_radio_caps = (OT_RADIO_CAPS_ENERGY_SCAN       |
                                    OT_RADIO_CAPS_RECEIVE_TIMING    |
                                    OT_RADIO_CAPS_TRANSMIT_TIMING   |
                                    OT_RADIO_CAPS_ACK_TIMEOUT       |
-                                   OT_RADIO_CAPS_SLEEP_TO_TX);
+                                   OT_RADIO_CAPS_SLEEP_TO_TX       |
+                                   OT_RADIO_CAPS_CSMA_BACKOFF      |
+                                   OT_RADIO_CAPS_TRANSMIT_RETRIES);
 
 static const char *radiospinel_workflow = "radio_spinel";
 static const esp_openthread_radio_config_t *s_esp_openthread_radio_config = NULL;
diff --git a/components/openthread/src/spinel/esp_radio_spinel.cpp b/components/openthread/src/spinel/esp_radio_spinel.cpp
index 3c35b0cbd8b..06ed3bc6e21 100644
--- a/components/openthread/src/spinel/esp_radio_spinel.cpp
+++ b/components/openthread/src/spinel/esp_radio_spinel.cpp
@@ -40,7 +40,9 @@ static otRadioCaps s_radio_caps = (OT_RADIO_CAPS_ENERGY_SCAN       |
                                    OT_RADIO_CAPS_RECEIVE_TIMING    |
                                    OT_RADIO_CAPS_TRANSMIT_TIMING   |
                                    OT_RADIO_CAPS_ACK_TIMEOUT       |
-                                   OT_RADIO_CAPS_SLEEP_TO_TX);
+                                   OT_RADIO_CAPS_SLEEP_TO_TX       |
+                                   OT_RADIO_CAPS_CSMA_BACKOFF      |
+                                   OT_RADIO_CAPS_TRANSMIT_RETRIES);
 
 static esp_radio_spinel_compatibility_error_callback s_radio_spinel_compatibility_error_callback = NULL;
 static esp_radio_spinel_coprocessor_reset_failure_callback s_radio_spinel_coprocessor_reset_failure_callback = NULL;