diff --git a/esphome/components/addressable_light/addressable_light_display.cpp b/esphome/components/addressable_light/addressable_light_display.cpp
index 16fab15b17..329620bcf0 100644
--- a/esphome/components/addressable_light/addressable_light_display.cpp
+++ b/esphome/components/addressable_light/addressable_light_display.cpp
@@ -58,7 +58,10 @@ void HOT AddressableLightDisplay::draw_absolute_pixel_internal(int x, int y, Col
 
   if (this->pixel_mapper_f_.has_value()) {
     // Params are passed by reference, so they may be modified in call.
-    this->addressable_light_buffer_[(*this->pixel_mapper_f_)(x, y)] = color;
+    int index = (*this->pixel_mapper_f_)(x, y);
+    if (index < 0 || static_cast<size_t>(index) >= this->addressable_light_buffer_.size())
+      return;
+    this->addressable_light_buffer_[index] = color;
   } else {
     this->addressable_light_buffer_[y * this->get_width_internal() + x] = color;
   }
diff --git a/esphome/components/api/api_frame_helper_plaintext.cpp b/esphome/components/api/api_frame_helper_plaintext.cpp
index 3c54ed7c70..793cece3b8 100644
--- a/esphome/components/api/api_frame_helper_plaintext.cpp
+++ b/esphome/components/api/api_frame_helper_plaintext.cpp
@@ -128,37 +128,37 @@ APIError APIPlaintextFrameHelper::try_read_frame_() {
 
     // Skip indicator byte at position 0
     uint8_t varint_pos = 1;
-    uint32_t consumed = 0;
 
-    auto msg_size_varint = ProtoVarInt::parse(&rx_header_buf_[varint_pos], rx_header_buf_pos_ - varint_pos, &consumed);
+    // rx_header_buf_pos_ >= 3 and varint_pos == 1, so len >= 2
+    auto msg_size_varint = ProtoVarInt::parse_non_empty(&rx_header_buf_[varint_pos], rx_header_buf_pos_ - varint_pos);
     if (!msg_size_varint.has_value()) {
       // not enough data there yet
       continue;
     }
 
-    if (msg_size_varint->as_uint32() > MAX_MESSAGE_SIZE) {
+    if (msg_size_varint.value > MAX_MESSAGE_SIZE) {
       state_ = State::FAILED;
-      HELPER_LOG("Bad packet: message size %" PRIu32 " exceeds maximum %u", msg_size_varint->as_uint32(),
-                 MAX_MESSAGE_SIZE);
+      HELPER_LOG("Bad packet: message size %" PRIu32 " exceeds maximum %u",
+                 static_cast<uint32_t>(msg_size_varint.value), MAX_MESSAGE_SIZE);
       return APIError::BAD_DATA_PACKET;
     }
-    rx_header_parsed_len_ = msg_size_varint->as_uint16();
+    rx_header_parsed_len_ = static_cast<uint16_t>(msg_size_varint.value);
 
     // Move to next varint position
-    varint_pos += consumed;
+    varint_pos += msg_size_varint.consumed;
 
-    auto msg_type_varint = ProtoVarInt::parse(&rx_header_buf_[varint_pos], rx_header_buf_pos_ - varint_pos, &consumed);
+    auto msg_type_varint = ProtoVarInt::parse(&rx_header_buf_[varint_pos], rx_header_buf_pos_ - varint_pos);
     if (!msg_type_varint.has_value()) {
       // not enough data there yet
       continue;
     }
-    if (msg_type_varint->as_uint32() > std::numeric_limits<uint16_t>::max()) {
+    if (msg_type_varint.value > std::numeric_limits<uint16_t>::max()) {
       state_ = State::FAILED;
-      HELPER_LOG("Bad packet: message type %" PRIu32 " exceeds maximum %u", msg_type_varint->as_uint32(),
-                 std::numeric_limits<uint16_t>::max());
+      HELPER_LOG("Bad packet: message type %" PRIu32 " exceeds maximum %u",
+                 static_cast<uint32_t>(msg_type_varint.value), std::numeric_limits<uint16_t>::max());
       return APIError::BAD_DATA_PACKET;
     }
-    rx_header_parsed_type_ = msg_type_varint->as_uint16();
+    rx_header_parsed_type_ = static_cast<uint16_t>(msg_type_varint.value);
     rx_header_parsed_ = true;
   }
   // header reading done
diff --git a/esphome/components/api/api_pb2.cpp b/esphome/components/api/api_pb2.cpp
index 07b4901bfe..e69654067b 100644
--- a/esphome/components/api/api_pb2.cpp
+++ b/esphome/components/api/api_pb2.cpp
@@ -7,13 +7,13 @@
 
 namespace esphome::api {
 
-bool HelloRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool HelloRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->api_version_major = value.as_uint32();
+      this->api_version_major = value;
       break;
     case 3:
-      this->api_version_minor = value.as_uint32();
+      this->api_version_minor = value;
       break;
     default:
       return false;
@@ -316,20 +316,20 @@ uint32_t CoverStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool CoverCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool CoverCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 4:
-      this->has_position = value.as_bool();
+      this->has_position = value != 0;
       break;
     case 6:
-      this->has_tilt = value.as_bool();
+      this->has_tilt = value != 0;
       break;
     case 8:
-      this->stop = value.as_bool();
+      this->stop = value != 0;
       break;
 #ifdef USE_DEVICES
     case 9:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -423,38 +423,38 @@ uint32_t FanStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool FanCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool FanCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->has_state = value.as_bool();
+      this->has_state = value != 0;
       break;
     case 3:
-      this->state = value.as_bool();
+      this->state = value != 0;
       break;
     case 6:
-      this->has_oscillating = value.as_bool();
+      this->has_oscillating = value != 0;
       break;
     case 7:
-      this->oscillating = value.as_bool();
+      this->oscillating = value != 0;
       break;
     case 8:
-      this->has_direction = value.as_bool();
+      this->has_direction = value != 0;
       break;
     case 9:
-      this->direction = static_cast<enums::FanDirection>(value.as_uint32());
+      this->direction = static_cast<enums::FanDirection>(value);
       break;
     case 10:
-      this->has_speed_level = value.as_bool();
+      this->has_speed_level = value != 0;
       break;
     case 11:
-      this->speed_level = value.as_int32();
+      this->speed_level = static_cast<int32_t>(value);
       break;
     case 12:
-      this->has_preset_mode = value.as_bool();
+      this->has_preset_mode = value != 0;
       break;
 #ifdef USE_DEVICES
     case 14:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -571,59 +571,59 @@ uint32_t LightStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool LightCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool LightCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->has_state = value.as_bool();
+      this->has_state = value != 0;
       break;
     case 3:
-      this->state = value.as_bool();
+      this->state = value != 0;
       break;
     case 4:
-      this->has_brightness = value.as_bool();
+      this->has_brightness = value != 0;
       break;
     case 22:
-      this->has_color_mode = value.as_bool();
+      this->has_color_mode = value != 0;
       break;
     case 23:
-      this->color_mode = static_cast<enums::ColorMode>(value.as_uint32());
+      this->color_mode = static_cast<enums::ColorMode>(value);
       break;
     case 20:
-      this->has_color_brightness = value.as_bool();
+      this->has_color_brightness = value != 0;
       break;
     case 6:
-      this->has_rgb = value.as_bool();
+      this->has_rgb = value != 0;
       break;
     case 10:
-      this->has_white = value.as_bool();
+      this->has_white = value != 0;
       break;
     case 12:
-      this->has_color_temperature = value.as_bool();
+      this->has_color_temperature = value != 0;
       break;
     case 24:
-      this->has_cold_white = value.as_bool();
+      this->has_cold_white = value != 0;
       break;
     case 26:
-      this->has_warm_white = value.as_bool();
+      this->has_warm_white = value != 0;
       break;
     case 14:
-      this->has_transition_length = value.as_bool();
+      this->has_transition_length = value != 0;
       break;
     case 15:
-      this->transition_length = value.as_uint32();
+      this->transition_length = value;
       break;
     case 16:
-      this->has_flash_length = value.as_bool();
+      this->has_flash_length = value != 0;
       break;
     case 17:
-      this->flash_length = value.as_uint32();
+      this->flash_length = value;
       break;
     case 18:
-      this->has_effect = value.as_bool();
+      this->has_effect = value != 0;
       break;
 #ifdef USE_DEVICES
     case 28:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -787,14 +787,14 @@ uint32_t SwitchStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool SwitchCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool SwitchCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->state = value.as_bool();
+      this->state = value != 0;
       break;
 #ifdef USE_DEVICES
     case 3:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -863,13 +863,13 @@ uint32_t TextSensorStateResponse::calculate_size() const {
   return size;
 }
 #endif
-bool SubscribeLogsRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool SubscribeLogsRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->level = static_cast<enums::LogLevel>(value.as_uint32());
+      this->level = static_cast<enums::LogLevel>(value);
       break;
     case 2:
-      this->dump_config = value.as_bool();
+      this->dump_config = value != 0;
       break;
     default:
       return false;
@@ -971,13 +971,13 @@ uint32_t HomeassistantActionRequest::calculate_size() const {
 }
 #endif
 #ifdef USE_API_HOMEASSISTANT_ACTION_RESPONSES
-bool HomeassistantActionResponse::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool HomeassistantActionResponse::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->call_id = value.as_uint32();
+      this->call_id = value;
       break;
     case 2:
-      this->success = value.as_bool();
+      this->success = value != 0;
       break;
     default:
       return false;
@@ -1036,38 +1036,38 @@ bool HomeAssistantStateResponse::decode_length(uint32_t field_id, ProtoLengthDel
   return true;
 }
 #endif
-bool DSTRule::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool DSTRule::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->time_seconds = value.as_sint32();
+      this->time_seconds = decode_zigzag32(value);
       break;
     case 2:
-      this->day = value.as_uint32();
+      this->day = value;
       break;
     case 3:
-      this->type = static_cast<enums::DSTRuleType>(value.as_uint32());
+      this->type = static_cast<enums::DSTRuleType>(value);
       break;
     case 4:
-      this->month = value.as_uint32();
+      this->month = value;
       break;
     case 5:
-      this->week = value.as_uint32();
+      this->week = value;
       break;
     case 6:
-      this->day_of_week = value.as_uint32();
+      this->day_of_week = value;
       break;
     default:
       return false;
   }
   return true;
 }
-bool ParsedTimezone::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool ParsedTimezone::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->std_offset_seconds = value.as_sint32();
+      this->std_offset_seconds = decode_zigzag32(value);
       break;
     case 2:
-      this->dst_offset_seconds = value.as_sint32();
+      this->dst_offset_seconds = decode_zigzag32(value);
       break;
     default:
       return false;
@@ -1138,22 +1138,22 @@ uint32_t ListEntitiesServicesResponse::calculate_size() const {
   size += ProtoSize::calc_uint32(1, static_cast<uint32_t>(this->supports_response));
   return size;
 }
-bool ExecuteServiceArgument::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool ExecuteServiceArgument::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->bool_ = value.as_bool();
+      this->bool_ = value != 0;
       break;
     case 2:
-      this->legacy_int = value.as_int32();
+      this->legacy_int = static_cast<int32_t>(value);
       break;
     case 5:
-      this->int_ = value.as_sint32();
+      this->int_ = decode_zigzag32(value);
       break;
     case 6:
-      this->bool_array.push_back(value.as_bool());
+      this->bool_array.push_back(value != 0);
       break;
     case 7:
-      this->int_array.push_back(value.as_sint32());
+      this->int_array.push_back(decode_zigzag32(value));
       break;
     default:
       return false;
@@ -1198,16 +1198,16 @@ void ExecuteServiceArgument::decode(const uint8_t *buffer, size_t length) {
   this->string_array.init(count_string_array);
   ProtoDecodableMessage::decode(buffer, length);
 }
-bool ExecuteServiceRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool ExecuteServiceRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
 #ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
     case 3:
-      this->call_id = value.as_uint32();
+      this->call_id = value;
       break;
 #endif
 #ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
     case 4:
-      this->return_response = value.as_bool();
+      this->return_response = value != 0;
       break;
 #endif
     default:
@@ -1309,13 +1309,13 @@ uint32_t CameraImageResponse::calculate_size() const {
 #endif
   return size;
 }
-bool CameraImageRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool CameraImageRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->single = value.as_bool();
+      this->single = value != 0;
       break;
     case 2:
-      this->stream = value.as_bool();
+      this->stream = value != 0;
       break;
     default:
       return false;
@@ -1464,53 +1464,53 @@ uint32_t ClimateStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool ClimateCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool ClimateCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->has_mode = value.as_bool();
+      this->has_mode = value != 0;
       break;
     case 3:
-      this->mode = static_cast<enums::ClimateMode>(value.as_uint32());
+      this->mode = static_cast<enums::ClimateMode>(value);
       break;
     case 4:
-      this->has_target_temperature = value.as_bool();
+      this->has_target_temperature = value != 0;
       break;
     case 6:
-      this->has_target_temperature_low = value.as_bool();
+      this->has_target_temperature_low = value != 0;
       break;
     case 8:
-      this->has_target_temperature_high = value.as_bool();
+      this->has_target_temperature_high = value != 0;
       break;
     case 12:
-      this->has_fan_mode = value.as_bool();
+      this->has_fan_mode = value != 0;
       break;
     case 13:
-      this->fan_mode = static_cast<enums::ClimateFanMode>(value.as_uint32());
+      this->fan_mode = static_cast<enums::ClimateFanMode>(value);
       break;
     case 14:
-      this->has_swing_mode = value.as_bool();
+      this->has_swing_mode = value != 0;
       break;
     case 15:
-      this->swing_mode = static_cast<enums::ClimateSwingMode>(value.as_uint32());
+      this->swing_mode = static_cast<enums::ClimateSwingMode>(value);
       break;
     case 16:
-      this->has_custom_fan_mode = value.as_bool();
+      this->has_custom_fan_mode = value != 0;
       break;
     case 18:
-      this->has_preset = value.as_bool();
+      this->has_preset = value != 0;
       break;
     case 19:
-      this->preset = static_cast<enums::ClimatePreset>(value.as_uint32());
+      this->preset = static_cast<enums::ClimatePreset>(value);
       break;
     case 20:
-      this->has_custom_preset = value.as_bool();
+      this->has_custom_preset = value != 0;
       break;
     case 22:
-      this->has_target_humidity = value.as_bool();
+      this->has_target_humidity = value != 0;
       break;
 #ifdef USE_DEVICES
     case 24:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -1627,21 +1627,21 @@ uint32_t WaterHeaterStateResponse::calculate_size() const {
   size += ProtoSize::calc_float(1, this->target_temperature_high);
   return size;
 }
-bool WaterHeaterCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool WaterHeaterCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->has_fields = value.as_uint32();
+      this->has_fields = value;
       break;
     case 3:
-      this->mode = static_cast<enums::WaterHeaterMode>(value.as_uint32());
+      this->mode = static_cast<enums::WaterHeaterMode>(value);
       break;
 #ifdef USE_DEVICES
     case 5:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     case 6:
-      this->state = value.as_uint32();
+      this->state = value;
       break;
     default:
       return false;
@@ -1727,11 +1727,11 @@ uint32_t NumberStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool NumberCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool NumberCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
 #ifdef USE_DEVICES
     case 3:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -1808,11 +1808,11 @@ uint32_t SelectStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool SelectCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool SelectCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
 #ifdef USE_DEVICES
     case 3:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -1899,29 +1899,29 @@ uint32_t SirenStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool SirenCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool SirenCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->has_state = value.as_bool();
+      this->has_state = value != 0;
       break;
     case 3:
-      this->state = value.as_bool();
+      this->state = value != 0;
       break;
     case 4:
-      this->has_tone = value.as_bool();
+      this->has_tone = value != 0;
       break;
     case 6:
-      this->has_duration = value.as_bool();
+      this->has_duration = value != 0;
       break;
     case 7:
-      this->duration = value.as_uint32();
+      this->duration = value;
       break;
     case 8:
-      this->has_volume = value.as_bool();
+      this->has_volume = value != 0;
       break;
 #ifdef USE_DEVICES
     case 10:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -2007,17 +2007,17 @@ uint32_t LockStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool LockCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool LockCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->command = static_cast<enums::LockCommand>(value.as_uint32());
+      this->command = static_cast<enums::LockCommand>(value);
       break;
     case 3:
-      this->has_code = value.as_bool();
+      this->has_code = value != 0;
       break;
 #ifdef USE_DEVICES
     case 5:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -2078,11 +2078,11 @@ uint32_t ListEntitiesButtonResponse::calculate_size() const {
 #endif
   return size;
 }
-bool ButtonCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool ButtonCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
 #ifdef USE_DEVICES
     case 2:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -2178,29 +2178,29 @@ uint32_t MediaPlayerStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool MediaPlayerCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool MediaPlayerCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->has_command = value.as_bool();
+      this->has_command = value != 0;
       break;
     case 3:
-      this->command = static_cast<enums::MediaPlayerCommand>(value.as_uint32());
+      this->command = static_cast<enums::MediaPlayerCommand>(value);
       break;
     case 4:
-      this->has_volume = value.as_bool();
+      this->has_volume = value != 0;
       break;
     case 6:
-      this->has_media_url = value.as_bool();
+      this->has_media_url = value != 0;
       break;
     case 8:
-      this->has_announcement = value.as_bool();
+      this->has_announcement = value != 0;
       break;
     case 9:
-      this->announcement = value.as_bool();
+      this->announcement = value != 0;
       break;
 #ifdef USE_DEVICES
     case 10:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -2234,10 +2234,10 @@ bool MediaPlayerCommandRequest::decode_32bit(uint32_t field_id, Proto32Bit value
 }
 #endif
 #ifdef USE_BLUETOOTH_PROXY
-bool SubscribeBluetoothLEAdvertisementsRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool SubscribeBluetoothLEAdvertisementsRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->flags = value.as_uint32();
+      this->flags = value;
       break;
     default:
       return false;
@@ -2270,19 +2270,19 @@ uint32_t BluetoothLERawAdvertisementsResponse::calculate_size() const {
   }
   return size;
 }
-bool BluetoothDeviceRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool BluetoothDeviceRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->address = value.as_uint64();
+      this->address = value;
       break;
     case 2:
-      this->request_type = static_cast<enums::BluetoothDeviceRequestType>(value.as_uint32());
+      this->request_type = static_cast<enums::BluetoothDeviceRequestType>(value);
       break;
     case 3:
-      this->has_address_type = value.as_bool();
+      this->has_address_type = value != 0;
       break;
     case 4:
-      this->address_type = value.as_uint32();
+      this->address_type = value;
       break;
     default:
       return false;
@@ -2303,10 +2303,10 @@ uint32_t BluetoothDeviceConnectionResponse::calculate_size() const {
   size += ProtoSize::calc_int32(1, this->error);
   return size;
 }
-bool BluetoothGATTGetServicesRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool BluetoothGATTGetServicesRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->address = value.as_uint64();
+      this->address = value;
       break;
     default:
       return false;
@@ -2409,13 +2409,13 @@ uint32_t BluetoothGATTGetServicesDoneResponse::calculate_size() const {
   size += ProtoSize::calc_uint64(1, this->address);
   return size;
 }
-bool BluetoothGATTReadRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool BluetoothGATTReadRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->address = value.as_uint64();
+      this->address = value;
       break;
     case 2:
-      this->handle = value.as_uint32();
+      this->handle = value;
       break;
     default:
       return false;
@@ -2434,16 +2434,16 @@ uint32_t BluetoothGATTReadResponse::calculate_size() const {
   size += ProtoSize::calc_length(1, this->data_len_);
   return size;
 }
-bool BluetoothGATTWriteRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool BluetoothGATTWriteRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->address = value.as_uint64();
+      this->address = value;
       break;
     case 2:
-      this->handle = value.as_uint32();
+      this->handle = value;
       break;
     case 3:
-      this->response = value.as_bool();
+      this->response = value != 0;
       break;
     default:
       return false;
@@ -2462,26 +2462,26 @@ bool BluetoothGATTWriteRequest::decode_length(uint32_t field_id, ProtoLengthDeli
   }
   return true;
 }
-bool BluetoothGATTReadDescriptorRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool BluetoothGATTReadDescriptorRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->address = value.as_uint64();
+      this->address = value;
       break;
     case 2:
-      this->handle = value.as_uint32();
+      this->handle = value;
       break;
     default:
       return false;
   }
   return true;
 }
-bool BluetoothGATTWriteDescriptorRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool BluetoothGATTWriteDescriptorRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->address = value.as_uint64();
+      this->address = value;
       break;
     case 2:
-      this->handle = value.as_uint32();
+      this->handle = value;
       break;
     default:
       return false;
@@ -2500,16 +2500,16 @@ bool BluetoothGATTWriteDescriptorRequest::decode_length(uint32_t field_id, Proto
   }
   return true;
 }
-bool BluetoothGATTNotifyRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool BluetoothGATTNotifyRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->address = value.as_uint64();
+      this->address = value;
       break;
     case 2:
-      this->handle = value.as_uint32();
+      this->handle = value;
       break;
     case 3:
-      this->enable = value.as_bool();
+      this->enable = value != 0;
       break;
     default:
       return false;
@@ -2628,10 +2628,10 @@ uint32_t BluetoothScannerStateResponse::calculate_size() const {
   size += ProtoSize::calc_uint32(1, static_cast<uint32_t>(this->configured_mode));
   return size;
 }
-bool BluetoothScannerSetModeRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool BluetoothScannerSetModeRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->mode = static_cast<enums::BluetoothScannerMode>(value.as_uint32());
+      this->mode = static_cast<enums::BluetoothScannerMode>(value);
       break;
     default:
       return false;
@@ -2640,13 +2640,13 @@ bool BluetoothScannerSetModeRequest::decode_varint(uint32_t field_id, ProtoVarIn
 }
 #endif
 #ifdef USE_VOICE_ASSISTANT
-bool SubscribeVoiceAssistantRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool SubscribeVoiceAssistantRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->subscribe = value.as_bool();
+      this->subscribe = value != 0;
       break;
     case 2:
-      this->flags = value.as_uint32();
+      this->flags = value;
       break;
     default:
       return false;
@@ -2681,13 +2681,13 @@ uint32_t VoiceAssistantRequest::calculate_size() const {
   size += ProtoSize::calc_length(1, this->wake_word_phrase.size());
   return size;
 }
-bool VoiceAssistantResponse::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool VoiceAssistantResponse::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->port = value.as_uint32();
+      this->port = value;
       break;
     case 2:
-      this->error = value.as_bool();
+      this->error = value != 0;
       break;
     default:
       return false;
@@ -2709,10 +2709,10 @@ bool VoiceAssistantEventData::decode_length(uint32_t field_id, ProtoLengthDelimi
   }
   return true;
 }
-bool VoiceAssistantEventResponse::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool VoiceAssistantEventResponse::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->event_type = static_cast<enums::VoiceAssistantEvent>(value.as_uint32());
+      this->event_type = static_cast<enums::VoiceAssistantEvent>(value);
       break;
     default:
       return false;
@@ -2730,10 +2730,10 @@ bool VoiceAssistantEventResponse::decode_length(uint32_t field_id, ProtoLengthDe
   }
   return true;
 }
-bool VoiceAssistantAudio::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool VoiceAssistantAudio::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->end = value.as_bool();
+      this->end = value != 0;
       break;
     default:
       return false;
@@ -2762,19 +2762,19 @@ uint32_t VoiceAssistantAudio::calculate_size() const {
   size += ProtoSize::calc_bool(1, this->end);
   return size;
 }
-bool VoiceAssistantTimerEventResponse::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool VoiceAssistantTimerEventResponse::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->event_type = static_cast<enums::VoiceAssistantTimerEvent>(value.as_uint32());
+      this->event_type = static_cast<enums::VoiceAssistantTimerEvent>(value);
       break;
     case 4:
-      this->total_seconds = value.as_uint32();
+      this->total_seconds = value;
       break;
     case 5:
-      this->seconds_left = value.as_uint32();
+      this->seconds_left = value;
       break;
     case 6:
-      this->is_active = value.as_bool();
+      this->is_active = value != 0;
       break;
     default:
       return false;
@@ -2796,10 +2796,10 @@ bool VoiceAssistantTimerEventResponse::decode_length(uint32_t field_id, ProtoLen
   }
   return true;
 }
-bool VoiceAssistantAnnounceRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool VoiceAssistantAnnounceRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 4:
-      this->start_conversation = value.as_bool();
+      this->start_conversation = value != 0;
       break;
     default:
       return false;
@@ -2849,10 +2849,10 @@ uint32_t VoiceAssistantWakeWord::calculate_size() const {
   }
   return size;
 }
-bool VoiceAssistantExternalWakeWord::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool VoiceAssistantExternalWakeWord::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 5:
-      this->model_size = value.as_uint32();
+      this->model_size = value;
       break;
     default:
       return false;
@@ -2986,14 +2986,14 @@ uint32_t AlarmControlPanelStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool AlarmControlPanelCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool AlarmControlPanelCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->command = static_cast<enums::AlarmControlPanelStateCommand>(value.as_uint32());
+      this->command = static_cast<enums::AlarmControlPanelStateCommand>(value);
       break;
 #ifdef USE_DEVICES
     case 4:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -3078,11 +3078,11 @@ uint32_t TextStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool TextCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool TextCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
 #ifdef USE_DEVICES
     case 3:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -3163,20 +3163,20 @@ uint32_t DateStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool DateCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool DateCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->year = value.as_uint32();
+      this->year = value;
       break;
     case 3:
-      this->month = value.as_uint32();
+      this->month = value;
       break;
     case 4:
-      this->day = value.as_uint32();
+      this->day = value;
       break;
 #ifdef USE_DEVICES
     case 5:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -3246,20 +3246,20 @@ uint32_t TimeStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool TimeCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool TimeCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->hour = value.as_uint32();
+      this->hour = value;
       break;
     case 3:
-      this->minute = value.as_uint32();
+      this->minute = value;
       break;
     case 4:
-      this->second = value.as_uint32();
+      this->second = value;
       break;
 #ifdef USE_DEVICES
     case 5:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -3389,17 +3389,17 @@ uint32_t ValveStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool ValveCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool ValveCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->has_position = value.as_bool();
+      this->has_position = value != 0;
       break;
     case 4:
-      this->stop = value.as_bool();
+      this->stop = value != 0;
       break;
 #ifdef USE_DEVICES
     case 5:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -3468,11 +3468,11 @@ uint32_t DateTimeStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool DateTimeCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool DateTimeCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
 #ifdef USE_DEVICES
     case 3:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -3557,14 +3557,14 @@ uint32_t UpdateStateResponse::calculate_size() const {
 #endif
   return size;
 }
-bool UpdateCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool UpdateCommandRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 2:
-      this->command = static_cast<enums::UpdateCommand>(value.as_uint32());
+      this->command = static_cast<enums::UpdateCommand>(value);
       break;
 #ifdef USE_DEVICES
     case 3:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     default:
@@ -3602,10 +3602,10 @@ uint32_t ZWaveProxyFrame::calculate_size() const {
   size += ProtoSize::calc_length(1, this->data_len);
   return size;
 }
-bool ZWaveProxyRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool ZWaveProxyRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->type = static_cast<enums::ZWaveProxyRequestType>(value.as_uint32());
+      this->type = static_cast<enums::ZWaveProxyRequestType>(value);
       break;
     default:
       return false;
@@ -3668,18 +3668,18 @@ uint32_t ListEntitiesInfraredResponse::calculate_size() const {
 }
 #endif
 #ifdef USE_IR_RF
-bool InfraredRFTransmitRawTimingsRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool InfraredRFTransmitRawTimingsRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
 #ifdef USE_DEVICES
     case 1:
-      this->device_id = value.as_uint32();
+      this->device_id = value;
       break;
 #endif
     case 3:
-      this->carrier_frequency = value.as_uint32();
+      this->carrier_frequency = value;
       break;
     case 4:
-      this->repeat_count = value.as_uint32();
+      this->repeat_count = value;
       break;
     default:
       return false;
@@ -3733,25 +3733,25 @@ uint32_t InfraredRFReceiveEvent::calculate_size() const {
 }
 #endif
 #ifdef USE_SERIAL_PROXY
-bool SerialProxyConfigureRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool SerialProxyConfigureRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->instance = value.as_uint32();
+      this->instance = value;
       break;
     case 2:
-      this->baudrate = value.as_uint32();
+      this->baudrate = value;
       break;
     case 3:
-      this->flow_control = value.as_bool();
+      this->flow_control = value != 0;
       break;
     case 4:
-      this->parity = static_cast<enums::SerialProxyParity>(value.as_uint32());
+      this->parity = static_cast<enums::SerialProxyParity>(value);
       break;
     case 5:
-      this->stop_bits = value.as_uint32();
+      this->stop_bits = value;
       break;
     case 6:
-      this->data_size = value.as_uint32();
+      this->data_size = value;
       break;
     default:
       return false;
@@ -3768,10 +3768,10 @@ uint32_t SerialProxyDataReceived::calculate_size() const {
   size += ProtoSize::calc_length(1, this->data_len_);
   return size;
 }
-bool SerialProxyWriteRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool SerialProxyWriteRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->instance = value.as_uint32();
+      this->instance = value;
       break;
     default:
       return false;
@@ -3790,23 +3790,23 @@ bool SerialProxyWriteRequest::decode_length(uint32_t field_id, ProtoLengthDelimi
   }
   return true;
 }
-bool SerialProxySetModemPinsRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool SerialProxySetModemPinsRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->instance = value.as_uint32();
+      this->instance = value;
       break;
     case 2:
-      this->line_states = value.as_uint32();
+      this->line_states = value;
       break;
     default:
       return false;
   }
   return true;
 }
-bool SerialProxyGetModemPinsRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool SerialProxyGetModemPinsRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->instance = value.as_uint32();
+      this->instance = value;
       break;
     default:
       return false;
@@ -3823,13 +3823,13 @@ uint32_t SerialProxyGetModemPinsResponse::calculate_size() const {
   size += ProtoSize::calc_uint32(1, this->line_states);
   return size;
 }
-bool SerialProxyRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool SerialProxyRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->instance = value.as_uint32();
+      this->instance = value;
       break;
     case 2:
-      this->type = static_cast<enums::SerialProxyRequestType>(value.as_uint32());
+      this->type = static_cast<enums::SerialProxyRequestType>(value);
       break;
     default:
       return false;
@@ -3852,22 +3852,22 @@ uint32_t SerialProxyRequestResponse::calculate_size() const {
 }
 #endif
 #ifdef USE_BLUETOOTH_PROXY
-bool BluetoothSetConnectionParamsRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
+bool BluetoothSetConnectionParamsRequest::decode_varint(uint32_t field_id, proto_varint_value_t value) {
   switch (field_id) {
     case 1:
-      this->address = value.as_uint64();
+      this->address = value;
       break;
     case 2:
-      this->min_interval = value.as_uint32();
+      this->min_interval = value;
       break;
     case 3:
-      this->max_interval = value.as_uint32();
+      this->max_interval = value;
       break;
     case 4:
-      this->latency = value.as_uint32();
+      this->latency = value;
       break;
     case 5:
-      this->timeout = value.as_uint32();
+      this->timeout = value;
       break;
     default:
       return false;
diff --git a/esphome/components/api/api_pb2.h b/esphome/components/api/api_pb2.h
index 09587f943d..5dd1723f02 100644
--- a/esphome/components/api/api_pb2.h
+++ b/esphome/components/api/api_pb2.h
@@ -399,7 +399,7 @@ class HelloRequest final : public ProtoDecodableMessage {
 
  protected:
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class HelloResponse final : public ProtoMessage {
  public:
@@ -688,7 +688,7 @@ class CoverCommandRequest final : public CommandProtoMessage {
 
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_FAN
@@ -756,7 +756,7 @@ class FanCommandRequest final : public CommandProtoMessage {
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_LIGHT
@@ -846,7 +846,7 @@ class LightCommandRequest final : public CommandProtoMessage {
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_SENSOR
@@ -936,7 +936,7 @@ class SwitchCommandRequest final : public CommandProtoMessage {
 
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_TEXT_SENSOR
@@ -988,7 +988,7 @@ class SubscribeLogsRequest final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class SubscribeLogsResponse final : public ProtoMessage {
  public:
@@ -1110,7 +1110,7 @@ class HomeassistantActionResponse final : public ProtoDecodableMessage {
 
  protected:
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_API_HOMEASSISTANT_STATES
@@ -1176,7 +1176,7 @@ class DSTRule final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class ParsedTimezone final : public ProtoDecodableMessage {
  public:
@@ -1190,7 +1190,7 @@ class ParsedTimezone final : public ProtoDecodableMessage {
 
  protected:
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class GetTimeResponse final : public ProtoDecodableMessage {
  public:
@@ -1260,7 +1260,7 @@ class ExecuteServiceArgument final : public ProtoDecodableMessage {
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class ExecuteServiceRequest final : public ProtoDecodableMessage {
  public:
@@ -1285,7 +1285,7 @@ class ExecuteServiceRequest final : public ProtoDecodableMessage {
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
@@ -1364,7 +1364,7 @@ class CameraImageRequest final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_CLIMATE
@@ -1463,7 +1463,7 @@ class ClimateCommandRequest final : public CommandProtoMessage {
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_WATER_HEATER
@@ -1527,7 +1527,7 @@ class WaterHeaterCommandRequest final : public CommandProtoMessage {
 
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_NUMBER
@@ -1583,7 +1583,7 @@ class NumberCommandRequest final : public CommandProtoMessage {
 
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_SELECT
@@ -1635,7 +1635,7 @@ class SelectCommandRequest final : public CommandProtoMessage {
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_SIREN
@@ -1695,7 +1695,7 @@ class SirenCommandRequest final : public CommandProtoMessage {
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_LOCK
@@ -1751,7 +1751,7 @@ class LockCommandRequest final : public CommandProtoMessage {
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_BUTTON
@@ -1784,7 +1784,7 @@ class ButtonCommandRequest final : public CommandProtoMessage {
 
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_MEDIA_PLAYER
@@ -1861,7 +1861,7 @@ class MediaPlayerCommandRequest final : public CommandProtoMessage {
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_BLUETOOTH_PROXY
@@ -1878,7 +1878,7 @@ class SubscribeBluetoothLEAdvertisementsRequest final : public ProtoDecodableMes
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class BluetoothLERawAdvertisement final : public ProtoMessage {
  public:
@@ -1928,7 +1928,7 @@ class BluetoothDeviceRequest final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class BluetoothDeviceConnectionResponse final : public ProtoMessage {
  public:
@@ -1962,7 +1962,7 @@ class BluetoothGATTGetServicesRequest final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class BluetoothGATTDescriptor final : public ProtoMessage {
  public:
@@ -2053,7 +2053,7 @@ class BluetoothGATTReadRequest final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class BluetoothGATTReadResponse final : public ProtoMessage {
  public:
@@ -2096,7 +2096,7 @@ class BluetoothGATTWriteRequest final : public ProtoDecodableMessage {
 
  protected:
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class BluetoothGATTReadDescriptorRequest final : public ProtoDecodableMessage {
  public:
@@ -2112,7 +2112,7 @@ class BluetoothGATTReadDescriptorRequest final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class BluetoothGATTWriteDescriptorRequest final : public ProtoDecodableMessage {
  public:
@@ -2131,7 +2131,7 @@ class BluetoothGATTWriteDescriptorRequest final : public ProtoDecodableMessage {
 
  protected:
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class BluetoothGATTNotifyRequest final : public ProtoDecodableMessage {
  public:
@@ -2148,7 +2148,7 @@ class BluetoothGATTNotifyRequest final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class BluetoothGATTNotifyDataResponse final : public ProtoMessage {
  public:
@@ -2328,7 +2328,7 @@ class BluetoothScannerSetModeRequest final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_VOICE_ASSISTANT
@@ -2346,7 +2346,7 @@ class SubscribeVoiceAssistantRequest final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class VoiceAssistantAudioSettings final : public ProtoMessage {
  public:
@@ -2395,7 +2395,7 @@ class VoiceAssistantResponse final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class VoiceAssistantEventData final : public ProtoDecodableMessage {
  public:
@@ -2423,7 +2423,7 @@ class VoiceAssistantEventResponse final : public ProtoDecodableMessage {
 
  protected:
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class VoiceAssistantAudio final : public ProtoDecodableMessage {
  public:
@@ -2443,7 +2443,7 @@ class VoiceAssistantAudio final : public ProtoDecodableMessage {
 
  protected:
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class VoiceAssistantTimerEventResponse final : public ProtoDecodableMessage {
  public:
@@ -2464,7 +2464,7 @@ class VoiceAssistantTimerEventResponse final : public ProtoDecodableMessage {
 
  protected:
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class VoiceAssistantAnnounceRequest final : public ProtoDecodableMessage {
  public:
@@ -2483,7 +2483,7 @@ class VoiceAssistantAnnounceRequest final : public ProtoDecodableMessage {
 
  protected:
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class VoiceAssistantAnnounceFinished final : public ProtoMessage {
  public:
@@ -2529,7 +2529,7 @@ class VoiceAssistantExternalWakeWord final : public ProtoDecodableMessage {
 
  protected:
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class VoiceAssistantConfigurationRequest final : public ProtoDecodableMessage {
  public:
@@ -2631,7 +2631,7 @@ class AlarmControlPanelCommandRequest final : public CommandProtoMessage {
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_TEXT
@@ -2686,7 +2686,7 @@ class TextCommandRequest final : public CommandProtoMessage {
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_DATETIME_DATE
@@ -2740,7 +2740,7 @@ class DateCommandRequest final : public CommandProtoMessage {
 
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_DATETIME_TIME
@@ -2794,7 +2794,7 @@ class TimeCommandRequest final : public CommandProtoMessage {
 
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_EVENT
@@ -2885,7 +2885,7 @@ class ValveCommandRequest final : public CommandProtoMessage {
 
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_DATETIME_DATETIME
@@ -2935,7 +2935,7 @@ class DateTimeCommandRequest final : public CommandProtoMessage {
 
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_UPDATE
@@ -2993,7 +2993,7 @@ class UpdateCommandRequest final : public CommandProtoMessage {
 
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_ZWAVE_PROXY
@@ -3033,7 +3033,7 @@ class ZWaveProxyRequest final : public ProtoDecodableMessage {
 
  protected:
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 #endif
 #ifdef USE_INFRARED
@@ -3078,7 +3078,7 @@ class InfraredRFTransmitRawTimingsRequest final : public ProtoDecodableMessage {
  protected:
   bool decode_32bit(uint32_t field_id, Proto32Bit value) override;
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class InfraredRFReceiveEvent final : public ProtoMessage {
  public:
@@ -3120,7 +3120,7 @@ class SerialProxyConfigureRequest final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class SerialProxyDataReceived final : public ProtoMessage {
  public:
@@ -3160,7 +3160,7 @@ class SerialProxyWriteRequest final : public ProtoDecodableMessage {
 
  protected:
   bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class SerialProxySetModemPinsRequest final : public ProtoDecodableMessage {
  public:
@@ -3176,7 +3176,7 @@ class SerialProxySetModemPinsRequest final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class SerialProxyGetModemPinsRequest final : public ProtoDecodableMessage {
  public:
@@ -3191,7 +3191,7 @@ class SerialProxyGetModemPinsRequest final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class SerialProxyGetModemPinsResponse final : public ProtoMessage {
  public:
@@ -3224,7 +3224,7 @@ class SerialProxyRequest final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class SerialProxyRequestResponse final : public ProtoMessage {
  public:
@@ -3264,7 +3264,7 @@ class BluetoothSetConnectionParamsRequest final : public ProtoDecodableMessage {
 #endif
 
  protected:
-  bool decode_varint(uint32_t field_id, ProtoVarInt value) override;
+  bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;
 };
 class BluetoothSetConnectionParamsResponse final : public ProtoMessage {
  public:
diff --git a/esphome/components/api/proto.cpp b/esphome/components/api/proto.cpp
index fb229928e5..8959ac7a2a 100644
--- a/esphome/components/api/proto.cpp
+++ b/esphome/components/api/proto.cpp
@@ -20,20 +20,40 @@ void ProtoWriteBuffer::encode_varint_raw_slow_(uint32_t value) {
   *this->pos_++ = static_cast<uint8_t>(value);
 }
 
+ProtoVarIntResult ProtoVarInt::parse_slow(const uint8_t *buffer, uint32_t len) {
+  // Multi-byte varint: first byte already checked to have high bit set
+  uint32_t result32 = buffer[0] & 0x7F;
 #ifdef USE_API_VARINT64
-optional<ProtoVarInt> ProtoVarInt::parse_wide(const uint8_t *buffer, uint32_t len, uint32_t *consumed,
-                                              uint32_t result32) {
+  uint32_t limit = std::min(len, uint32_t(4));
+#else
+  uint32_t limit = std::min(len, uint32_t(5));
+#endif
+  for (uint32_t i = 1; i < limit; i++) {
+    uint8_t val = buffer[i];
+    result32 |= uint32_t(val & 0x7F) << (i * 7);
+    if ((val & 0x80) == 0) {
+      return {result32, i + 1};
+    }
+  }
+#ifdef USE_API_VARINT64
+  return parse_wide(buffer, len, result32);
+#else
+  return {0, 0};
+#endif
+}
+
+#ifdef USE_API_VARINT64
+ProtoVarIntResult ProtoVarInt::parse_wide(const uint8_t *buffer, uint32_t len, uint32_t result32) {
   uint64_t result64 = result32;
   uint32_t limit = std::min(len, uint32_t(10));
   for (uint32_t i = 4; i < limit; i++) {
     uint8_t val = buffer[i];
     result64 |= uint64_t(val & 0x7F) << (i * 7);
     if ((val & 0x80) == 0) {
-      *consumed = i + 1;
-      return ProtoVarInt(result64);
+      return {result64, i + 1};
     }
   }
-  return {};
+  return {0, 0};
 }
 #endif
 
@@ -43,18 +63,16 @@ uint32_t ProtoDecodableMessage::count_repeated_field(const uint8_t *buffer, size
   const uint8_t *end = buffer + length;
 
   while (ptr < end) {
-    uint32_t consumed;
-
-    // Parse field header (tag)
-    auto res = ProtoVarInt::parse(ptr, end - ptr, &consumed);
+    // Parse field header (tag) - ptr < end guarantees len >= 1
+    auto res = ProtoVarInt::parse_non_empty(ptr, end - ptr);
     if (!res.has_value()) {
       break;  // Invalid data, stop counting
     }
 
-    uint32_t tag = res->as_uint32();
+    uint32_t tag = static_cast<uint32_t>(res.value);
     uint32_t field_type = tag & WIRE_TYPE_MASK;
     uint32_t field_id = tag >> 3;
-    ptr += consumed;
+    ptr += res.consumed;
 
     // Count if this is the target field
     if (field_id == target_field_id) {
@@ -64,20 +82,20 @@ uint32_t ProtoDecodableMessage::count_repeated_field(const uint8_t *buffer, size
     // Skip field data based on wire type
     switch (field_type) {
       case WIRE_TYPE_VARINT: {  // VarInt - parse and skip
-        res = ProtoVarInt::parse(ptr, end - ptr, &consumed);
+        res = ProtoVarInt::parse(ptr, end - ptr);
         if (!res.has_value()) {
           return count;  // Invalid data, return what we have
         }
-        ptr += consumed;
+        ptr += res.consumed;
         break;
       }
       case WIRE_TYPE_LENGTH_DELIMITED: {  // Length-delimited - parse length and skip data
-        res = ProtoVarInt::parse(ptr, end - ptr, &consumed);
+        res = ProtoVarInt::parse(ptr, end - ptr);
         if (!res.has_value()) {
           return count;
         }
-        uint32_t field_length = res->as_uint32();
-        ptr += consumed;
+        uint32_t field_length = static_cast<uint32_t>(res.value);
+        ptr += res.consumed;
         if (field_length > static_cast<size_t>(end - ptr)) {
           return count;  // Out of bounds
         }
@@ -190,41 +208,40 @@ void ProtoDecodableMessage::decode(const uint8_t *buffer, size_t length) {
   const uint8_t *end = buffer + length;
 
   while (ptr < end) {
-    uint32_t consumed;
-
-    // Parse field header
-    auto res = ProtoVarInt::parse(ptr, end - ptr, &consumed);
+    // Parse field header - ptr < end guarantees len >= 1
+    auto res = ProtoVarInt::parse_non_empty(ptr, end - ptr);
     if (!res.has_value()) {
       ESP_LOGV(TAG, "Invalid field start at offset %ld", (long) (ptr - buffer));
       return;
     }
 
-    uint32_t tag = res->as_uint32();
+    uint32_t tag = static_cast<uint32_t>(res.value);
     uint32_t field_type = tag & WIRE_TYPE_MASK;
     uint32_t field_id = tag >> 3;
-    ptr += consumed;
+    ptr += res.consumed;
 
     switch (field_type) {
       case WIRE_TYPE_VARINT: {  // VarInt
-        res = ProtoVarInt::parse(ptr, end - ptr, &consumed);
+        res = ProtoVarInt::parse(ptr, end - ptr);
         if (!res.has_value()) {
           ESP_LOGV(TAG, "Invalid VarInt at offset %ld", (long) (ptr - buffer));
           return;
         }
-        if (!this->decode_varint(field_id, *res)) {
-          ESP_LOGV(TAG, "Cannot decode VarInt field %" PRIu32 " with value %" PRIu32 "!", field_id, res->as_uint32());
+        if (!this->decode_varint(field_id, res.value)) {
+          ESP_LOGV(TAG, "Cannot decode VarInt field %" PRIu32 " with value %" PRIu64 "!", field_id,
+                   static_cast<uint64_t>(res.value));
         }
-        ptr += consumed;
+        ptr += res.consumed;
         break;
       }
       case WIRE_TYPE_LENGTH_DELIMITED: {  // Length-delimited
-        res = ProtoVarInt::parse(ptr, end - ptr, &consumed);
+        res = ProtoVarInt::parse(ptr, end - ptr);
         if (!res.has_value()) {
           ESP_LOGV(TAG, "Invalid Length Delimited at offset %ld", (long) (ptr - buffer));
           return;
         }
-        uint32_t field_length = res->as_uint32();
-        ptr += consumed;
+        uint32_t field_length = static_cast<uint32_t>(res.value);
+        ptr += res.consumed;
         if (field_length > static_cast<size_t>(end - ptr)) {
           ESP_LOGV(TAG, "Out-of-bounds Length Delimited at offset %ld", (long) (ptr - buffer));
           return;
diff --git a/esphome/components/api/proto.h b/esphome/components/api/proto.h
index 9bbd97ae00..d1c955b1fb 100644
--- a/esphome/components/api/proto.h
+++ b/esphome/components/api/proto.h
@@ -99,90 +99,56 @@ inline void encode_varint_to_buffer(uint32_t val, uint8_t *buffer) {
  * within the same function scope where temporaries are created.
  */
 
-/// Representation of a VarInt - in ProtoBuf should be 64bit but we only use 32bit
+/// Type used for decoded varint values - uint64_t when BLE needs 64-bit addresses, uint32_t otherwise
+#ifdef USE_API_VARINT64
+using proto_varint_value_t = uint64_t;
+#else
+using proto_varint_value_t = uint32_t;
+#endif
+
+/// Sentinel value for consumed field indicating parse failure
+inline constexpr uint32_t PROTO_VARINT_PARSE_FAILED = 0;
+
+/// Result of parsing a varint: value + number of bytes consumed.
+/// consumed == PROTO_VARINT_PARSE_FAILED indicates parse failure (not enough data or invalid).
+struct ProtoVarIntResult {
+  proto_varint_value_t value;
+  uint32_t consumed;  // PROTO_VARINT_PARSE_FAILED = parse failed
+
+  constexpr bool has_value() const { return this->consumed != PROTO_VARINT_PARSE_FAILED; }
+};
+
+/// Static varint parsing methods for the protobuf wire format.
 class ProtoVarInt {
  public:
-  ProtoVarInt() : value_(0) {}
-  explicit ProtoVarInt(uint64_t value) : value_(value) {}
-
-  /// Parse a varint from buffer. consumed must be a valid pointer (not null).
-  static optional<ProtoVarInt> parse(const uint8_t *buffer, uint32_t len, uint32_t *consumed) {
+  /// Parse a varint from buffer. Caller must ensure len >= 1.
+  /// Returns result with consumed=0 on failure (truncated multi-byte varint).
+  static inline ProtoVarIntResult ESPHOME_ALWAYS_INLINE parse_non_empty(const uint8_t *buffer, uint32_t len) {
 #ifdef ESPHOME_DEBUG_API
-    assert(consumed != nullptr);
+    assert(len > 0);
 #endif
-    if (len == 0)
-      return {};
     // Fast path: single-byte varints (0-127) are the most common case
-    // (booleans, small enums, field tags). Avoid loop overhead entirely.
-    if ((buffer[0] & 0x80) == 0) {
-      *consumed = 1;
-      return ProtoVarInt(buffer[0]);
-    }
-    // 32-bit phase: process remaining bytes with native 32-bit shifts.
-    // Without USE_API_VARINT64: cover bytes 1-4 (shifts 7, 14, 21, 28) — the uint32_t
-    // shift at byte 4 (shift by 28) may lose bits 32-34, but those are always zero for valid uint32 values.
-    // With USE_API_VARINT64: cover bytes 1-3 (shifts 7, 14, 21) so parse_wide handles
-    // byte 4+ with full 64-bit arithmetic (avoids truncating values > UINT32_MAX).
-    uint32_t result32 = buffer[0] & 0x7F;
-#ifdef USE_API_VARINT64
-    uint32_t limit = std::min(len, uint32_t(4));
-#else
-    uint32_t limit = std::min(len, uint32_t(5));
-#endif
-    for (uint32_t i = 1; i < limit; i++) {
-      uint8_t val = buffer[i];
-      result32 |= uint32_t(val & 0x7F) << (i * 7);
-      if ((val & 0x80) == 0) {
-        *consumed = i + 1;
-        return ProtoVarInt(result32);
-      }
-    }
-    // 64-bit phase for remaining bytes (BLE addresses etc.)
-#ifdef USE_API_VARINT64
-    return parse_wide(buffer, len, consumed, result32);
-#else
-    return {};
-#endif
+    // (booleans, small enums, field tags, small message sizes/types).
+    if ((buffer[0] & 0x80) == 0) [[likely]]
+      return {buffer[0], 1};
+    return parse_slow(buffer, len);
+  }
+
+  /// Parse a varint from buffer (safe for empty buffers).
+  /// Returns result with consumed=0 on failure (empty buffer or truncated varint).
+  static inline ProtoVarIntResult ESPHOME_ALWAYS_INLINE parse(const uint8_t *buffer, uint32_t len) {
+    if (len == 0)
+      return {0, PROTO_VARINT_PARSE_FAILED};
+    return parse_non_empty(buffer, len);
   }
 
-#ifdef USE_API_VARINT64
  protected:
+  // Slow path for multi-byte varints (>= 128), outlined to keep fast path small
+  static ProtoVarIntResult parse_slow(const uint8_t *buffer, uint32_t len) __attribute__((noinline));
+
+#ifdef USE_API_VARINT64
   /// Continue parsing varint bytes 4-9 with 64-bit arithmetic.
-  /// Separated to keep 64-bit shift code (__ashldi3 on 32-bit platforms) out of the common path.
-  static optional<ProtoVarInt> parse_wide(const uint8_t *buffer, uint32_t len, uint32_t *consumed, uint32_t result32)
-      __attribute__((noinline));
-
- public:
-#endif
-
-  constexpr uint16_t as_uint16() const { return this->value_; }
-  constexpr uint32_t as_uint32() const { return this->value_; }
-  constexpr bool as_bool() const { return this->value_; }
-  constexpr int32_t as_int32() const {
-    // Not ZigZag encoded
-    return static_cast<int32_t>(this->value_);
-  }
-  constexpr int32_t as_sint32() const {
-    // with ZigZag encoding
-    return decode_zigzag32(static_cast<uint32_t>(this->value_));
-  }
-#ifdef USE_API_VARINT64
-  constexpr uint64_t as_uint64() const { return this->value_; }
-  constexpr int64_t as_int64() const {
-    // Not ZigZag encoded
-    return static_cast<int64_t>(this->value_);
-  }
-  constexpr int64_t as_sint64() const {
-    // with ZigZag encoding
-    return decode_zigzag64(this->value_);
-  }
-#endif
-
- protected:
-#ifdef USE_API_VARINT64
-  uint64_t value_;
-#else
-  uint32_t value_;
+  static ProtoVarIntResult parse_wide(const uint8_t *buffer, uint32_t len, uint32_t result32) __attribute__((noinline));
 #endif
 };
 
@@ -499,7 +465,7 @@ class ProtoDecodableMessage : public ProtoMessage {
 
  protected:
   ~ProtoDecodableMessage() = default;
-  virtual bool decode_varint(uint32_t field_id, ProtoVarInt value) { return false; }
+  virtual bool decode_varint(uint32_t field_id, proto_varint_value_t value) { return false; }
   virtual bool decode_length(uint32_t field_id, ProtoLengthDelimited value) { return false; }
   virtual bool decode_32bit(uint32_t field_id, Proto32Bit value) { return false; }
   // NOTE: decode_64bit removed - wire type 1 not supported
diff --git a/esphome/components/bl0942/bl0942.cpp b/esphome/components/bl0942/bl0942.cpp
index 16ad33141d..7d38597423 100644
--- a/esphome/components/bl0942/bl0942.cpp
+++ b/esphome/components/bl0942/bl0942.cpp
@@ -173,7 +173,7 @@ void BL0942::received_package_(DataPacket *data) {
   float i_rms = (uint24_t) data->i_rms / current_reference_;
   float watt = (int24_t) data->watt / power_reference_;
   float total_energy_consumption = cf_cnt / energy_reference_;
-  float frequency = 1000000.0f / data->frequency;
+  float frequency = data->frequency != 0 ? 1000000.0f / data->frequency : NAN;
 
   if (voltage_sensor_ != nullptr) {
     voltage_sensor_->publish_state(v_rms);
diff --git a/esphome/components/bme680_bsec/bme680_bsec.cpp b/esphome/components/bme680_bsec/bme680_bsec.cpp
index 392d071b31..454be0c0fe 100644
--- a/esphome/components/bme680_bsec/bme680_bsec.cpp
+++ b/esphome/components/bme680_bsec/bme680_bsec.cpp
@@ -383,7 +383,7 @@ void BME680BSECComponent::publish_(const bsec_output_t *outputs, uint8_t num_out
     switch (outputs[i].sensor_id) {
       case BSEC_OUTPUT_IAQ:
       case BSEC_OUTPUT_STATIC_IAQ: {
-        uint8_t accuracy = outputs[i].accuracy;
+        uint8_t accuracy = std::min<uint8_t>(outputs[i].accuracy, std::size(IAQ_ACCURACY_STATES) - 1);
         this->queue_push_([this, signal]() { this->publish_sensor_(this->iaq_sensor_, signal); });
         this->queue_push_([this, accuracy]() {
           this->publish_sensor_(this->iaq_accuracy_text_sensor_, IAQ_ACCURACY_STATES[accuracy]);
diff --git a/esphome/components/bme68x_bsec2/bme68x_bsec2.cpp b/esphome/components/bme68x_bsec2/bme68x_bsec2.cpp
index 1a42c9d54b..0210d1e67d 100644
--- a/esphome/components/bme68x_bsec2/bme68x_bsec2.cpp
+++ b/esphome/components/bme68x_bsec2/bme68x_bsec2.cpp
@@ -438,6 +438,7 @@ void BME68xBSEC2Component::publish_(const bsec_output_t *outputs, uint8_t num_ou
     }
   }
   if (update_accuracy) {
+    max_accuracy = std::min<uint8_t>(max_accuracy, std::size(IAQ_ACCURACY_STATES) - 1);
 #ifdef USE_SENSOR
     this->queue_push_(
         [this, max_accuracy]() { this->publish_sensor_(this->iaq_accuracy_sensor_, max_accuracy, true); });
diff --git a/esphome/components/combination/combination.cpp b/esphome/components/combination/combination.cpp
index ece7cca482..2f0bd26a02 100644
--- a/esphome/components/combination/combination.cpp
+++ b/esphome/components/combination/combination.cpp
@@ -163,7 +163,7 @@ void MeanCombinationComponent::handle_new_value(float value) {
     return;
 
   float sum = 0.0;
-  size_t count = 0.0;
+  size_t count = 0;
 
   for (const auto &sensor : this->sensors_) {
     if (std::isfinite(sensor->state)) {
@@ -172,6 +172,10 @@ void MeanCombinationComponent::handle_new_value(float value) {
     }
   }
 
+  if (count == 0) {
+    this->publish_state(NAN);
+    return;
+  }
   float mean = sum / count;
 
   this->publish_state(mean);
@@ -238,6 +242,11 @@ void RangeCombinationComponent::handle_new_value(float value) {
     }
   }
 
+  if (sensor_states.empty()) {
+    this->publish_state(NAN);
+    return;
+  }
+
   sort(sensor_states.begin(), sensor_states.end());
 
   float range = sensor_states.back() - sensor_states.front();
diff --git a/esphome/components/dac7678/dac7678_output.cpp b/esphome/components/dac7678/dac7678_output.cpp
index 83f8722e7f..27ab54f0be 100644
--- a/esphome/components/dac7678/dac7678_output.cpp
+++ b/esphome/components/dac7678/dac7678_output.cpp
@@ -62,6 +62,8 @@ void DAC7678Output::register_channel(DAC7678Channel *channel) {
 }
 
 void DAC7678Output::set_channel_value_(uint8_t channel, uint16_t value) {
+  if (channel >= std::size(this->dac_input_reg_))
+    return;
   if (this->dac_input_reg_[channel] != value) {
     ESP_LOGV(TAG, "Channel %01u: input_reg=%04u ", channel, value);
 
diff --git a/esphome/components/graph/graph.cpp b/esphome/components/graph/graph.cpp
index c43cd07fe0..801c97e3f5 100644
--- a/esphome/components/graph/graph.cpp
+++ b/esphome/components/graph/graph.cpp
@@ -171,7 +171,7 @@ void Graph::draw(Display *buff, uint16_t x_offset, uint16_t y_offset, Color colo
     bool prev_b = false;
     int16_t prev_y = 0;
     for (uint32_t i = 0; i < this->width_; i++) {
-      float v = (trace->get_tracedata()->get_value(i) - ymin) / yrange;
+      float v = yrange != 0 ? (trace->get_tracedata()->get_value(i) - ymin) / yrange : NAN;
       if (!std::isnan(v) && (thick > 0)) {
         int16_t x = this->width_ - 1 - i + x_offset;
         uint8_t bit = 1 << ((i % (thick * LineType::PATTERN_LENGTH)) / thick);
diff --git a/esphome/components/mics_4514/mics_4514.cpp b/esphome/components/mics_4514/mics_4514.cpp
index 60413b32d7..ce63a7d062 100644
--- a/esphome/components/mics_4514/mics_4514.cpp
+++ b/esphome/components/mics_4514/mics_4514.cpp
@@ -59,6 +59,12 @@ void MICS4514Component::update() {
     return;
   }
 
+  if (this->red_calibration_ == 0 || this->ox_calibration_ == 0) {
+    ESP_LOGW(TAG, "Calibration values are zero, retrying");
+    this->status_set_warning();
+    this->initial_ = true;
+    return;
+  }
   float red_f = (float) (power - red) / this->red_calibration_;
   float ox_f = (float) (power - ox) / this->ox_calibration_;
 
diff --git a/esphome/components/seeed_mr24hpc1/seeed_mr24hpc1.cpp b/esphome/components/seeed_mr24hpc1/seeed_mr24hpc1.cpp
index 99d519b434..263603704a 100644
--- a/esphome/components/seeed_mr24hpc1/seeed_mr24hpc1.cpp
+++ b/esphome/components/seeed_mr24hpc1/seeed_mr24hpc1.cpp
@@ -452,7 +452,8 @@ void MR24HPC1Component::r24_frame_parse_open_underlying_information_(uint8_t *da
       }
       break;
     case 0x83:
-      if (this->custom_presence_of_detection_sensor_ != nullptr) {
+      if (this->custom_presence_of_detection_sensor_ != nullptr &&
+          data[FRAME_DATA_INDEX] < std::size(S_PRESENCE_OF_DETECTION_RANGE_STR)) {
         this->custom_presence_of_detection_sensor_->publish_state(
             S_PRESENCE_OF_DETECTION_RANGE_STR[data[FRAME_DATA_INDEX]]);
       }
@@ -646,7 +647,7 @@ void MR24HPC1Component::r24_frame_parse_human_information_(uint8_t *data) {
 #ifdef USE_BINARY_SENSOR
     case 0x01:
     case 0x81:
-      if (this->has_target_binary_sensor_ != nullptr) {
+      if (this->has_target_binary_sensor_ != nullptr && data[FRAME_DATA_INDEX] < std::size(S_SOMEONE_EXISTS_STR)) {
         this->has_target_binary_sensor_->publish_state(S_SOMEONE_EXISTS_STR[data[FRAME_DATA_INDEX]]);
       }
       break;
diff --git a/esphome/components/seeed_mr60fda2/seeed_mr60fda2.cpp b/esphome/components/seeed_mr60fda2/seeed_mr60fda2.cpp
index c6527a948e..e24e9b338e 100644
--- a/esphome/components/seeed_mr60fda2/seeed_mr60fda2.cpp
+++ b/esphome/components/seeed_mr60fda2/seeed_mr60fda2.cpp
@@ -334,6 +334,8 @@ void MR60FDA2Component::process_frame_() {
 
 // Send Heartbeat Packet Command
 void MR60FDA2Component::set_install_height(uint8_t index) {
+  if (index >= std::size(INSTALL_HEIGHT))
+    return;
   uint8_t send_data[13] = {0x01, 0x00, 0x00, 0x00, 0x04, 0x0E, 0x04, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00};
   float_to_bytes(INSTALL_HEIGHT[index], &send_data[8]);
   send_data[12] = calculate_checksum(send_data + 8, 4);
@@ -345,6 +347,8 @@ void MR60FDA2Component::set_install_height(uint8_t index) {
 }
 
 void MR60FDA2Component::set_height_threshold(uint8_t index) {
+  if (index >= std::size(HEIGHT_THRESHOLD))
+    return;
   uint8_t send_data[13] = {0x01, 0x00, 0x00, 0x00, 0x04, 0x0E, 0x08, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x00};
   float_to_bytes(HEIGHT_THRESHOLD[index], &send_data[8]);
   send_data[12] = calculate_checksum(send_data + 8, 4);
@@ -356,6 +360,8 @@ void MR60FDA2Component::set_height_threshold(uint8_t index) {
 }
 
 void MR60FDA2Component::set_sensitivity(uint8_t index) {
+  if (index >= std::size(SENSITIVITY))
+    return;
   uint8_t send_data[13] = {0x01, 0x00, 0x00, 0x00, 0x04, 0x0E, 0x0A, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x00};
 
   int_to_bytes(SENSITIVITY[index], &send_data[8]);
diff --git a/esphome/components/tsl2561/tsl2561.cpp b/esphome/components/tsl2561/tsl2561.cpp
index cb4c38a83c..bccff1fb26 100644
--- a/esphome/components/tsl2561/tsl2561.cpp
+++ b/esphome/components/tsl2561/tsl2561.cpp
@@ -70,6 +70,10 @@ float TSL2561Sensor::calculate_lx_(uint16_t ch0, uint16_t ch1) {
     return NAN;
   }
 
+  if (ch0 == 0) {
+    ESP_LOGVV(TAG, "No light detected");
+    return 0.0f;
+  }
   float d0 = ch0, d1 = ch1;
   float ratio = d1 / d0;
 
diff --git a/esphome/components/ufire_ec/ufire_ec.cpp b/esphome/components/ufire_ec/ufire_ec.cpp
index a1c3568a1a..40e3be2757 100644
--- a/esphome/components/ufire_ec/ufire_ec.cpp
+++ b/esphome/components/ufire_ec/ufire_ec.cpp
@@ -1,5 +1,6 @@
 #include "esphome/core/log.h"
 #include "ufire_ec.h"
+#include <cmath>
 
 namespace esphome {
 namespace ufire_ec {
@@ -60,9 +61,15 @@ float UFireECComponent::measure_temperature_() { return this->read_data_(REGISTE
 
 float UFireECComponent::measure_ms_() { return this->read_data_(REGISTER_MS); }
 
-void UFireECComponent::set_solution_(float solution, float temperature) {
-  solution /= (1 - (this->temperature_coefficient_ * (temperature - 25)));
+bool UFireECComponent::set_solution_(float solution, float temperature) {
+  float denom = 1 - (this->temperature_coefficient_ * (temperature - 25));
+  if (std::abs(denom) < 1e-6f) {
+    ESP_LOGE(TAG, "Temperature compensation denominator is zero");
+    return false;
+  }
+  solution /= denom;
   this->write_data_(REGISTER_SOLUTION, solution);
+  return true;
 }
 
 void UFireECComponent::set_compensation_(float temperature) { this->write_data_(REGISTER_COMPENSATION, temperature); }
@@ -72,7 +79,8 @@ void UFireECComponent::set_coefficient_(float coefficient) { this->write_data_(R
 void UFireECComponent::set_temperature_(float temperature) { this->write_data_(REGISTER_TEMP, temperature); }
 
 void UFireECComponent::calibrate_probe(float solution, float temperature) {
-  this->set_solution_(solution, temperature);
+  if (!this->set_solution_(solution, temperature))
+    return;
   this->write_byte(REGISTER_TASK, COMMAND_CALIBRATE_PROBE);
 }
 
diff --git a/esphome/components/ufire_ec/ufire_ec.h b/esphome/components/ufire_ec/ufire_ec.h
index bfbed1b43e..8a648b5038 100644
--- a/esphome/components/ufire_ec/ufire_ec.h
+++ b/esphome/components/ufire_ec/ufire_ec.h
@@ -44,7 +44,7 @@ class UFireECComponent : public PollingComponent, public i2c::I2CDevice {
  protected:
   float measure_temperature_();
   float measure_ms_();
-  void set_solution_(float solution, float temperature);
+  bool set_solution_(float solution, float temperature);
   void set_compensation_(float temperature);
   void set_coefficient_(float coefficient);
   void set_temperature_(float temperature);
diff --git a/esphome/components/xxtea/xxtea.cpp b/esphome/components/xxtea/xxtea.cpp
index aae663ee01..ba17530b24 100644
--- a/esphome/components/xxtea/xxtea.cpp
+++ b/esphome/components/xxtea/xxtea.cpp
@@ -7,6 +7,8 @@ static const uint32_t DELTA = 0x9e3779b9;
 #define MX ((((z >> 5) ^ (y << 2)) + ((y >> 3) ^ (z << 4))) ^ ((sum ^ y) + (k[(p ^ e) & 7] ^ z)))
 
 void encrypt(uint32_t *v, size_t n, const uint32_t *k) {
+  if (n == 0)
+    return;
   uint32_t z, y, sum, e;
   size_t p;
   size_t q = 6 + 52 / n;
@@ -25,6 +27,8 @@ void encrypt(uint32_t *v, size_t n, const uint32_t *k) {
 }
 
 void decrypt(uint32_t *v, size_t n, const uint32_t *k) {
+  if (n == 0)
+    return;
   uint32_t z, y, sum, e;
   size_t p;
   size_t q = 6 + 52 / n;
diff --git a/script/api_protobuf/api_protobuf.py b/script/api_protobuf/api_protobuf.py
index 206f8f558b..1c2a3e5cc2 100755
--- a/script/api_protobuf/api_protobuf.py
+++ b/script/api_protobuf/api_protobuf.py
@@ -461,7 +461,7 @@ class FloatType(TypeInfo):
 class Int64Type(TypeInfo):
     cpp_type = "int64_t"
     default_value = "0"
-    decode_varint = "value.as_int64()"
+    decode_varint = "static_cast<int64_t>(value)"
     encode_func = "encode_int64"
     wire_type = WireType.VARINT  # Uses wire type 0
 
@@ -481,7 +481,7 @@ class Int64Type(TypeInfo):
 class UInt64Type(TypeInfo):
     cpp_type = "uint64_t"
     default_value = "0"
-    decode_varint = "value.as_uint64()"
+    decode_varint = "value"
     encode_func = "encode_uint64"
     wire_type = WireType.VARINT  # Uses wire type 0
 
@@ -501,7 +501,7 @@ class UInt64Type(TypeInfo):
 class Int32Type(TypeInfo):
     cpp_type = "int32_t"
     default_value = "0"
-    decode_varint = "value.as_int32()"
+    decode_varint = "static_cast<int32_t>(value)"
     encode_func = "encode_int32"
     wire_type = WireType.VARINT  # Uses wire type 0
 
@@ -573,7 +573,7 @@ class Fixed32Type(TypeInfo):
 class BoolType(TypeInfo):
     cpp_type = "bool"
     default_value = "false"
-    decode_varint = "value.as_bool()"
+    decode_varint = "value != 0"
     encode_func = "encode_bool"
     wire_type = WireType.VARINT  # Uses wire type 0
 
@@ -1151,7 +1151,7 @@ class FixedArrayBytesType(TypeInfo):
 class UInt32Type(TypeInfo):
     cpp_type = "uint32_t"
     default_value = "0"
-    decode_varint = "value.as_uint32()"
+    decode_varint = "value"
     encode_func = "encode_uint32"
     wire_type = WireType.VARINT  # Uses wire type 0
 
@@ -1175,7 +1175,7 @@ class EnumType(TypeInfo):
 
     @property
     def decode_varint(self) -> str:
-        return f"static_cast<{self.cpp_type}>(value.as_uint32())"
+        return f"static_cast<{self.cpp_type}>(value)"
 
     default_value = ""
     wire_type = WireType.VARINT  # Uses wire type 0
@@ -1262,7 +1262,7 @@ class SFixed64Type(TypeInfo):
 class SInt32Type(TypeInfo):
     cpp_type = "int32_t"
     default_value = "0"
-    decode_varint = "value.as_sint32()"
+    decode_varint = "decode_zigzag32(value)"
     encode_func = "encode_sint32"
     wire_type = WireType.VARINT  # Uses wire type 0
 
@@ -1282,7 +1282,7 @@ class SInt32Type(TypeInfo):
 class SInt64Type(TypeInfo):
     cpp_type = "int64_t"
     default_value = "0"
-    decode_varint = "value.as_sint64()"
+    decode_varint = "decode_zigzag64(value)"
     encode_func = "encode_sint64"
     wire_type = WireType.VARINT  # Uses wire type 0
 
@@ -2205,7 +2205,7 @@ def build_message_type(
 
     cpp = ""
     if decode_varint:
-        o = f"bool {desc.name}::decode_varint(uint32_t field_id, ProtoVarInt value) {{\n"
+        o = f"bool {desc.name}::decode_varint(uint32_t field_id, proto_varint_value_t value) {{\n"
         o += "  switch (field_id) {\n"
         o += indent("\n".join(decode_varint), "    ") + "\n"
         o += "    default: return false;\n"
@@ -2213,7 +2213,7 @@ def build_message_type(
         o += "  return true;\n"
         o += "}\n"
         cpp += o
-        prot = "bool decode_varint(uint32_t field_id, ProtoVarInt value) override;"
+        prot = "bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;"
         protected_content.insert(0, prot)
     if decode_length:
         o = f"bool {desc.name}::decode_length(uint32_t field_id, ProtoLengthDelimited value) {{\n"
diff --git a/script/ci-custom.py b/script/ci-custom.py
index 8e1652b505..06fcdadb8c 100755
--- a/script/ci-custom.py
+++ b/script/ci-custom.py
@@ -519,7 +519,7 @@ def lint_constants_usage():
             continue
         errs.append(
             f"Constant {highlight(constant)} is defined in {len(uses)} files. Please move all definitions of the "
-            f"constant to const.py (Uses: {', '.join(str(u) for u in uses)}) in a separate PR. "
+            f"constant to esphome/components/const/__init__.py (Uses: {', '.join(str(u) for u in uses)}) in a separate PR. "
             "See https://developers.esphome.io/contributing/code/#python"
         )
     return errs
diff --git a/script/ci_memory_impact_comment.py b/script/ci_memory_impact_comment.py
index a296130645..01316da27f 100755
--- a/script/ci_memory_impact_comment.py
+++ b/script/ci_memory_impact_comment.py
@@ -160,6 +160,76 @@ def format_change(before: int, after: int, threshold: float | None = None) -> st
     return f"{emoji} {delta_str} ({pct_str})"
 
 
+def _sig_base(sym: str) -> str:
+    """Strip argument types from a symbol name for fuzzy matching.
+
+    Removes the entire outermost parenthesized argument list (including
+    the parentheses) from the symbol string.
+
+    This makes, for example, "foo(int)::nested" and "foo(float)::nested"
+    share the same key "foo::nested", while "foo(int)" maps to "foo" and
+    therefore does NOT collide with "foo(int)::nested".
+    """
+    start = sym.find("(")
+    if start == -1:
+        return sym
+    end = sym.rfind(")")
+    if end == -1:
+        return sym
+    return sym[:start] + sym[end + 1 :]
+
+
+_AMBIGUOUS = object()
+
+
+def _match_signature_changes(
+    changed_symbols: list[tuple[str, int, int, int]],
+    new_symbols: list[tuple[str, int]],
+    removed_symbols: list[tuple[str, int]],
+) -> tuple[
+    list[tuple[str, int, int, int]],
+    list[tuple[str, int]],
+    list[tuple[str, int]],
+]:
+    """Match new/removed symbol pairs that only differ in argument types.
+
+    When a function's argument types change (e.g. foo(vector<>&) -> foo(Buffer&)),
+    it appears as a new + removed symbol. This matches them by base name and moves
+    them to changed_symbols. Only matches unambiguous 1:1 pairs.
+    """
+    if not new_symbols or not removed_symbols:
+        return changed_symbols, new_symbols, removed_symbols
+
+    # Build base -> entry maps; mark ambiguous bases with sentinel
+    new_by_base: dict[str, tuple[str, int] | object] = {}
+    for entry in new_symbols:
+        base = _sig_base(entry[0])
+        new_by_base[base] = _AMBIGUOUS if base in new_by_base else entry
+    removed_by_base: dict[str, tuple[str, int] | object] = {}
+    for entry in removed_symbols:
+        base = _sig_base(entry[0])
+        removed_by_base[base] = _AMBIGUOUS if base in removed_by_base else entry
+
+    matched: set[str] = set()  # matched base keys
+    for base, new_entry in new_by_base.items():
+        if new_entry is _AMBIGUOUS:
+            continue
+        rem_entry = removed_by_base.get(base)
+        if rem_entry is None or rem_entry is _AMBIGUOUS:
+            continue
+        pr_sym, pr_size = new_entry
+        _rm_sym, target_size = rem_entry
+        delta = pr_size - target_size
+        if delta != 0:
+            changed_symbols.append((pr_sym, target_size, pr_size, delta))
+        matched.add(base)
+
+    if matched:
+        new_symbols = [e for e in new_symbols if _sig_base(e[0]) not in matched]
+        removed_symbols = [e for e in removed_symbols if _sig_base(e[0]) not in matched]
+    return changed_symbols, new_symbols, removed_symbols
+
+
 def prepare_symbol_changes_data(
     target_symbols: dict | None, pr_symbols: dict | None
 ) -> dict | None:
@@ -200,6 +270,11 @@ def prepare_symbol_changes_data(
             delta = pr_size - target_size
             changed_symbols.append((symbol, target_size, pr_size, delta))
 
+    # Match new/removed symbols that only differ in argument types
+    changed_symbols, new_symbols, removed_symbols = _match_signature_changes(
+        changed_symbols, new_symbols, removed_symbols
+    )
+
     if not changed_symbols and not new_symbols and not removed_symbols:
         return None
 
diff --git a/tests/unit_tests/analyze_memory/__init__.py b/tests/unit_tests/analyze_memory/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tests/unit_tests/analyze_memory/test_ci_memory_impact_comment.py b/tests/unit_tests/analyze_memory/test_ci_memory_impact_comment.py
new file mode 100644
index 0000000000..8399ac0303
--- /dev/null
+++ b/tests/unit_tests/analyze_memory/test_ci_memory_impact_comment.py
@@ -0,0 +1,99 @@
+"""Tests for script/ci_memory_impact_comment.py symbol matching."""
+
+from pathlib import Path
+import sys
+
+# Add script directory to path so we can import the module
+sys.path.insert(0, str(Path(__file__).parent.parent.parent.parent / "script"))
+
+from ci_memory_impact_comment import prepare_symbol_changes_data  # noqa: E402
+
+
+def test_prepare_symbol_changes_signature_match() -> None:
+    """Symbols with same base name but different args are matched as changed."""
+    target = {
+        "Foo::bar(std::vector<unsigned char>&, int)": 300,
+        "unchanged()": 50,
+    }
+    pr = {
+        "Foo::bar(ProtoByteBuffer&, int)": 320,
+        "unchanged()": 50,
+    }
+    result = prepare_symbol_changes_data(target, pr)
+    assert result is not None
+    assert len(result["changed_symbols"]) == 1
+    assert len(result["new_symbols"]) == 0
+    assert len(result["removed_symbols"]) == 0
+    sym, t_size, p_size, delta = result["changed_symbols"][0]
+    assert sym == "Foo::bar(ProtoByteBuffer&, int)"
+    assert t_size == 300
+    assert p_size == 320
+    assert delta == 20
+
+
+def test_prepare_symbol_changes_ambiguous_overloads_not_matched() -> None:
+    """Multiple overloads with same base name stay as new/removed."""
+    target = {
+        "Foo::bar(int)": 100,
+        "Foo::bar(float)": 200,
+    }
+    pr = {
+        "Foo::bar(double)": 150,
+        "Foo::bar(long)": 250,
+    }
+    result = prepare_symbol_changes_data(target, pr)
+    assert result is not None
+    assert len(result["changed_symbols"]) == 0
+    assert len(result["new_symbols"]) == 2
+    assert len(result["removed_symbols"]) == 2
+
+
+def test_prepare_symbol_changes_no_parens_not_matched() -> None:
+    """Symbols without parens (variables) are not fuzzy-matched."""
+    target = {"my_global_var": 100}
+    pr = {"my_global_var_v2": 120}
+    result = prepare_symbol_changes_data(target, pr)
+    assert result is not None
+    assert len(result["changed_symbols"]) == 0
+    assert len(result["new_symbols"]) == 1
+    assert len(result["removed_symbols"]) == 1
+
+
+def test_prepare_symbol_changes_nested_symbols_matched_separately() -> None:
+    """Nested symbols like ::__pstr__ don't collide with parent function."""
+    target = {
+        "Foo::bar(std::vector<unsigned char>&, int)": 300,
+        "Foo::bar(std::vector<unsigned char>&, int)::__pstr__": 19,
+    }
+    pr = {
+        "Foo::bar(ProtoByteBuffer&, int)": 320,
+        "Foo::bar(ProtoByteBuffer&, int)::__pstr__": 19,
+    }
+    result = prepare_symbol_changes_data(target, pr)
+    assert result is not None
+    # Both the function and its nested __pstr__ should be matched (not new/removed)
+    assert len(result["new_symbols"]) == 0
+    assert len(result["removed_symbols"]) == 0
+    # __pstr__ has delta=0 so it's silently dropped, only the function shows
+    assert len(result["changed_symbols"]) == 1
+    sym, t_size, p_size, delta = result["changed_symbols"][0]
+    assert sym == "Foo::bar(ProtoByteBuffer&, int)"
+    assert delta == 20
+
+
+def test_prepare_symbol_changes_exact_match_preferred() -> None:
+    """Exact name matches are found before fuzzy matching runs."""
+    target = {
+        "Foo::bar(int)": 100,
+    }
+    pr = {
+        "Foo::bar(int)": 120,
+    }
+    result = prepare_symbol_changes_data(target, pr)
+    assert result is not None
+    assert len(result["changed_symbols"]) == 1
+    assert len(result["new_symbols"]) == 0
+    assert len(result["removed_symbols"]) == 0
+    sym, t_size, p_size, delta = result["changed_symbols"][0]
+    assert sym == "Foo::bar(int)"
+    assert delta == 20