[api] Device defined action responses (#12136)

Co-authored-by: J. Nick Koston <nick@home-assistant.io> Co-authored-by: J. Nick Koston <nick@koston.org>
2026-02-27 17:34:22 -07:00 · 2025-12-07 04:47:57 +13:00
parent 75c41b11d1
commit f20aaf3981
46 changed files with 1455 additions and 105 deletions
--- a/esphome/components/api/init.py
+++ b/esphome/components/api/init.py
@@ -27,12 +27,13 @@ from esphome.const import (
    CONF_SERVICE,
    CONF_SERVICES,
    CONF_TAG,
+    CONF_THEN,
    CONF_TRIGGER_ID,
    CONF_VARIABLES,
 )
-from esphome.core import CORE, ID, CoroPriority, coroutine_with_priority
-from esphome.cpp_generator import TemplateArgsType
-from esphome.types import ConfigType
+from esphome.core import CORE, ID, CoroPriority, EsphomeError, coroutine_with_priority
+from esphome.cpp_generator import MockObj, TemplateArgsType
+from esphome.types import ConfigFragmentType, ConfigType

 _LOGGER = logging.getLogger(__name__)

@@ -63,17 +64,21 @@ HomeAssistantActionResponseTrigger = api_ns.class_(
    "HomeAssistantActionResponseTrigger", automation.Trigger
 )
 APIConnectedCondition = api_ns.class_("APIConnectedCondition", Condition)
+APIRespondAction = api_ns.class_("APIRespondAction", automation.Action)
+APIUnregisterServiceCallAction = api_ns.class_(
+    "APIUnregisterServiceCallAction", automation.Action
+)

 UserServiceTrigger = api_ns.class_("UserServiceTrigger", automation.Trigger)
 ListEntitiesServicesArgument = api_ns.class_("ListEntitiesServicesArgument")
-SERVICE_ARG_NATIVE_TYPES = {
-    "bool": bool,
+SERVICE_ARG_NATIVE_TYPES: dict[str, MockObj] = {
+    "bool": cg.bool_,
    "int": cg.int32,
-    "float": float,
+    "float": cg.float_,
    "string": cg.std_string,
-    "bool[]": cg.FixedVector.template(bool).operator("const").operator("ref"),
+    "bool[]": cg.FixedVector.template(cg.bool_).operator("const").operator("ref"),
    "int[]": cg.FixedVector.template(cg.int32).operator("const").operator("ref"),
-    "float[]": cg.FixedVector.template(float).operator("const").operator("ref"),
+    "float[]": cg.FixedVector.template(cg.float_).operator("const").operator("ref"),
    "string[]": cg.FixedVector.template(cg.std_string)
    .operator("const")
    .operator("ref"),
@@ -102,6 +107,85 @@ def validate_encryption_key(value):
    return value


+CONF_SUPPORTS_RESPONSE = "supports_response"
+
+# Enum values in api::enums namespace
+enums_ns = api_ns.namespace("enums")
+SUPPORTS_RESPONSE_OPTIONS = {
+    "none": enums_ns.SUPPORTS_RESPONSE_NONE,
+    "optional": enums_ns.SUPPORTS_RESPONSE_OPTIONAL,
+    "only": enums_ns.SUPPORTS_RESPONSE_ONLY,
+    "status": enums_ns.SUPPORTS_RESPONSE_STATUS,
+}
+
+
+def _auto_detect_supports_response(config: ConfigType) -> ConfigType:
+    """Auto-detect supports_response based on api.respond usage in the action's then block.
+
+    - If api.respond with data found: set to "optional" (unless user explicitly set)
+    - If api.respond without data found: set to "status" (unless user explicitly set)
+    - If no api.respond found: set to "none" (unless user explicitly set)
+    """
+
+    def scan_actions(items: ConfigFragmentType) -> tuple[bool, bool]:
+        """Recursively scan actions for api.respond.
+
+        Returns: (found, has_data) tuple - has_data is True if ANY api.respond has data
+        """
+        found_any = False
+        has_data_any = False
+
+        if isinstance(items, list):
+            for item in items:
+                found, has_data = scan_actions(item)
+                if found:
+                    found_any = True
+                    has_data_any = has_data_any or has_data
+        elif isinstance(items, dict):
+            # Check if this is an api.respond action
+            if "api.respond" in items:
+                respond_config = items["api.respond"]
+                has_data = isinstance(respond_config, dict) and "data" in respond_config
+                return True, has_data
+            # Recursively check all values
+            for value in items.values():
+                found, has_data = scan_actions(value)
+                if found:
+                    found_any = True
+                    has_data_any = has_data_any or has_data
+
+        return found_any, has_data_any
+
+    then = config.get(CONF_THEN, [])
+    action_name = config.get(CONF_ACTION)
+    found, has_data = scan_actions(then)
+
+    # If user explicitly set supports_response, validate and use that
+    if CONF_SUPPORTS_RESPONSE in config:
+        user_value = config[CONF_SUPPORTS_RESPONSE]
+        # Validate: "only" requires api.respond with data
+        if user_value == "only" and not has_data:
+            raise cv.Invalid(
+                f"Action '{action_name}' has supports_response=only but no api.respond "
+                "action with 'data:' was found. Use 'status' for responses without data, "
+                "or add 'data:' to your api.respond action."
+            )
+        return config
+
+    # Auto-detect based on api.respond usage
+    if found:
+        config[CONF_SUPPORTS_RESPONSE] = "optional" if has_data else "status"
+    else:
+        config[CONF_SUPPORTS_RESPONSE] = "none"
+
+    return config
+
+
+def _validate_supports_response(value):
+    """Validate supports_response after auto-detection has set the value."""
+    return cv.enum(SUPPORTS_RESPONSE_OPTIONS, lower=True)(value)
+
+
 ACTIONS_SCHEMA = automation.validate_automation(
    {
        cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(UserServiceTrigger),
@@ -112,10 +196,20 @@ ACTIONS_SCHEMA = automation.validate_automation(
                cv.validate_id_name: cv.one_of(*SERVICE_ARG_NATIVE_TYPES, lower=True),
            }
        ),
+        # No default - auto-detected by _auto_detect_supports_response
+        cv.Optional(CONF_SUPPORTS_RESPONSE): cv.enum(
+            SUPPORTS_RESPONSE_OPTIONS, lower=True
+        ),
    },
    cv.All(
        cv.has_exactly_one_key(CONF_SERVICE, CONF_ACTION),
        cv.rename_key(CONF_SERVICE, CONF_ACTION),
+        _auto_detect_supports_response,
+        # Re-validate supports_response after auto-detection sets it
+        cv.Schema(
+            {cv.Required(CONF_SUPPORTS_RESPONSE): _validate_supports_response},
+            extra=cv.ALLOW_EXTRA,
+        ),
    ),
 )

@@ -242,7 +336,7 @@ CONFIG_SCHEMA = cv.All(


@coroutine_with_priority(CoroPriority.WEB)
-async def to_code(config):
+async def to_code(config: ConfigType) -> None:
    var = cg.new_Pvariable(config[CONF_ID])
    await cg.register_component(var, config)

@@ -279,20 +373,61 @@ async def to_code(config):
        # Collect all triggers first, then register all at once with initializer_list
        triggers: list[cg.Pvariable] = []
        for conf in actions:
-            template_args = []
-            func_args = []
-            service_arg_names = []
+            func_args: list[tuple[MockObj, str]] = []
+            service_template_args: list[MockObj] = []  # User service argument types
+
+            # Determine supports_response mode
+            # cv.enum returns the key with enum_value attribute containing the MockObj
+            supports_response_key = conf[CONF_SUPPORTS_RESPONSE]
+            supports_response = supports_response_key.enum_value
+            is_none = supports_response_key == "none"
+            is_optional = supports_response_key == "optional"
+
+            # Add call_id and return_response based on supports_response mode
+            # These must match the C++ Trigger template arguments
+            # - none: no extra args
+            # - status: call_id only (for reporting success/error without data)
+            # - only: call_id only (response always expected with data)
+            # - optional: call_id + return_response (client decides)
+            if not is_none:
+                # call_id is present for "optional", "only", and "status"
+                func_args.append((cg.uint32, "call_id"))
+                # return_response only present for "optional"
+                if is_optional:
+                    func_args.append((cg.bool_, "return_response"))
+
+            service_arg_names: list[str] = []
            for name, var_ in conf[CONF_VARIABLES].items():
                native = SERVICE_ARG_NATIVE_TYPES[var_]
-                template_args.append(native)
+                service_template_args.append(native)
                func_args.append((native, name))
                service_arg_names.append(name)
-            templ = cg.TemplateArguments(*template_args)
+            # Template args: supports_response mode, then user service arg types
+            templ = cg.TemplateArguments(supports_response, *service_template_args)
            trigger = cg.new_Pvariable(
-                conf[CONF_TRIGGER_ID], templ, conf[CONF_ACTION], service_arg_names
+                conf[CONF_TRIGGER_ID],
+                templ,
+                conf[CONF_ACTION],
+                service_arg_names,
            )
            triggers.append(trigger)
-            await automation.build_automation(trigger, func_args, conf)
+            auto = await automation.build_automation(trigger, func_args, conf)
+
+            # For non-none response modes, automatically append unregister action
+            # This ensures the call is unregistered after all actions complete (including async ones)
+            if not is_none:
+                arg_types = [arg[0] for arg in func_args]
+                action_templ = cg.TemplateArguments(*arg_types)
+                unregister_id = ID(
+                    f"{conf[CONF_TRIGGER_ID]}__unregister",
+                    is_declaration=True,
+                    type=APIUnregisterServiceCallAction.template(action_templ),
+                )
+                unregister_action = cg.new_Pvariable(
+                    unregister_id,
+                    var,
+                )
+                cg.add(auto.add_actions([unregister_action]))
        # Register all services at once - single allocation, no reallocations
        cg.add(var.initialize_user_services(triggers))

@@ -538,6 +673,80 @@ async def homeassistant_tag_scanned_to_code(config, action_id, template_arg, arg
    return var


+CONF_SUCCESS = "success"
+CONF_ERROR_MESSAGE = "error_message"
+
+
+def _validate_api_respond_data(config):
+    """Set flag during validation so AUTO_LOAD can include json component."""
+    if CONF_DATA in config:
+        CORE.data.setdefault(DOMAIN, {})[CONF_CAPTURE_RESPONSE] = True
+    return config
+
+
+API_RESPOND_ACTION_SCHEMA = cv.All(
+    cv.Schema(
+        {
+            cv.GenerateID(): cv.use_id(APIServer),
+            cv.Optional(CONF_SUCCESS, default=True): cv.templatable(cv.boolean),
+            cv.Optional(CONF_ERROR_MESSAGE, default=""): cv.templatable(cv.string),
+            cv.Optional(CONF_DATA): cv.lambda_,
+        }
+    ),
+    _validate_api_respond_data,
+)
+
+
+@automation.register_action(
+    "api.respond",
+    APIRespondAction,
+    API_RESPOND_ACTION_SCHEMA,
+)
+async def api_respond_to_code(
+    config: ConfigType,
+    action_id: ID,
+    template_arg: cg.TemplateArguments,
+    args: TemplateArgsType,
+) -> MockObj:
+    # Validate that api.respond is used inside an API action context.
+    # We can't easily validate this at config time since the schema validation
+    # doesn't have access to the parent action context. Validating here in to_code
+    # is still much better than a cryptic C++ compile error.
+    has_call_id = any(name == "call_id" for _, name in args)
+    if not has_call_id:
+        raise EsphomeError(
+            "api.respond can only be used inside an API action's 'then:' block. "
+            "The 'call_id' variable is required to send a response."
+        )
+
+    cg.add_define("USE_API_USER_DEFINED_ACTION_RESPONSES")
+    serv = await cg.get_variable(config[CONF_ID])
+    var = cg.new_Pvariable(action_id, template_arg, serv)
+
+    # Check if we're in optional mode (has return_response arg)
+    is_optional = any(name == "return_response" for _, name in args)
+    if is_optional:
+        cg.add(var.set_is_optional_mode(True))
+
+    templ = await cg.templatable(config[CONF_SUCCESS], args, cg.bool_)
+    cg.add(var.set_success(templ))
+
+    templ = await cg.templatable(config[CONF_ERROR_MESSAGE], args, cg.std_string)
+    cg.add(var.set_error_message(templ))
+
+    if CONF_DATA in config:
+        cg.add_define("USE_API_USER_DEFINED_ACTION_RESPONSES_JSON")
+        # Lambda populates the JsonObject root - no return value needed
+        lambda_ = await cg.process_lambda(
+            config[CONF_DATA],
+            args + [(cg.JsonObject, "root")],
+            return_type=cg.void,
+        )
+        cg.add(var.set_data(lambda_))
+
+    return var
+
+
 API_CONNECTED_CONDITION_SCHEMA = cv.Schema(
    {
        cv.GenerateID(): cv.use_id(APIServer),
--- a/esphome/components/api/api.proto
+++ b/esphome/components/api/api.proto
@@ -855,6 +855,14 @@ enum ServiceArgType {
  SERVICE_ARG_TYPE_FLOAT_ARRAY = 6;
  SERVICE_ARG_TYPE_STRING_ARRAY = 7;
 }
+enum SupportsResponseType {
+  SUPPORTS_RESPONSE_NONE = 0;
+  SUPPORTS_RESPONSE_OPTIONAL = 1;
+  SUPPORTS_RESPONSE_ONLY = 2;
+  // Status-only response - reports success/error without data payload
+  // Value is higher to avoid conflicts with future Home Assistant values
+  SUPPORTS_RESPONSE_STATUS = 100;
+}
 message ListEntitiesServicesArgument {
  option (ifdef) = "USE_API_USER_DEFINED_ACTIONS";
  string name = 1;
@@ -868,6 +876,7 @@ message ListEntitiesServicesResponse {
  string name = 1;
  fixed32 key = 2;
  repeated ListEntitiesServicesArgument args = 3 [(fixed_vector) = true];
+  SupportsResponseType supports_response = 4;
 }
 message ExecuteServiceArgument {
  option (ifdef) = "USE_API_USER_DEFINED_ACTIONS";
@@ -890,6 +899,21 @@ message ExecuteServiceRequest {

  fixed32 key = 1;
  repeated ExecuteServiceArgument args = 2 [(fixed_vector) = true];
+  uint32 call_id = 3 [(field_ifdef) = "USE_API_USER_DEFINED_ACTION_RESPONSES"];
+  bool return_response = 4 [(field_ifdef) = "USE_API_USER_DEFINED_ACTION_RESPONSES"];
+}
+
+// Message sent by ESPHome to Home Assistant with service execution response data
+message ExecuteServiceResponse {
+  option (id) = 131;
+  option (source) = SOURCE_SERVER;
+  option (no_delay) = true;
+  option (ifdef) = "USE_API_USER_DEFINED_ACTION_RESPONSES";
+
+  uint32 call_id = 1; // Matches the call_id from ExecuteServiceRequest
+  bool success = 2; // Whether the service execution succeeded
+  string error_message = 3; // Error message if success = false
+  bytes response_data = 4 [(pointer_to_buffer) = true, (field_ifdef) = "USE_API_USER_DEFINED_ACTION_RESPONSES_JSON"];
 }

 // ==================== CAMERA ====================
--- a/esphome/components/api/api_connection.cpp
+++ b/esphome/components/api/api_connection.cpp
@@ -6,6 +6,9 @@
 #ifdef USE_API_PLAINTEXT
 #include "api_frame_helper_plaintext.h"
 #endif
+#ifdef USE_API_USER_DEFINED_ACTIONS
+#include "user_services.h"
+#endif
 #include <cerrno>
 #include <cinttypes>
 #include <functional>
@@ -1554,15 +1557,54 @@ void APIConnection::on_home_assistant_state_response(const HomeAssistantStateRes
 #ifdef USE_API_USER_DEFINED_ACTIONS
 void APIConnection::execute_service(const ExecuteServiceRequest &msg) {
  bool found = false;
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+  // Register the call and get a unique server-generated action_call_id
+  // This avoids collisions when multiple clients use the same call_id
+  uint32_t action_call_id = 0;
+  if (msg.call_id != 0) {
+    action_call_id = this->parent_->register_active_action_call(msg.call_id, this);
+  }
+  // Use the overload that passes action_call_id separately (avoids copying msg)
+  for (auto *service : this->parent_->get_user_services()) {
+    if (service->execute_service(msg, action_call_id)) {
+      found = true;
+    }
+  }
+#else
  for (auto *service : this->parent_->get_user_services()) {
    if (service->execute_service(msg)) {
      found = true;
    }
  }
+#endif
  if (!found) {
    ESP_LOGV(TAG, "Could not find service");
  }
+  // Note: For services with supports_response != none, the call is unregistered
+  // by an automatically appended APIUnregisterServiceCallAction at the end of
+  // the action list. This ensures async actions (delays, waits) complete first.
 }
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+void APIConnection::send_execute_service_response(uint32_t call_id, bool success, const std::string &error_message) {
+  ExecuteServiceResponse resp;
+  resp.call_id = call_id;
+  resp.success = success;
+  resp.set_error_message(StringRef(error_message));
+  this->send_message(resp, ExecuteServiceResponse::MESSAGE_TYPE);
+}
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+void APIConnection::send_execute_service_response(uint32_t call_id, bool success, const std::string &error_message,
+                                                  const uint8_t *response_data, size_t response_data_len) {
+  ExecuteServiceResponse resp;
+  resp.call_id = call_id;
+  resp.success = success;
+  resp.set_error_message(StringRef(error_message));
+  resp.response_data = response_data;
+  resp.response_data_len = response_data_len;
+  this->send_message(resp, ExecuteServiceResponse::MESSAGE_TYPE);
+}
+#endif  // USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+#endif  // USE_API_USER_DEFINED_ACTION_RESPONSES
 #endif

 #ifdef USE_API_HOMEASSISTANT_ACTION_RESPONSES
--- a/esphome/components/api/api_connection.h
+++ b/esphome/components/api/api_connection.h
@@ -223,6 +223,13 @@ class APIConnection final : public APIServerConnection {
 #endif
 #ifdef USE_API_USER_DEFINED_ACTIONS
  void execute_service(const ExecuteServiceRequest &msg) override;
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+  void send_execute_service_response(uint32_t call_id, bool success, const std::string &error_message);
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+  void send_execute_service_response(uint32_t call_id, bool success, const std::string &error_message,
+                                     const uint8_t *response_data, size_t response_data_len);
+#endif  // USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+#endif  // USE_API_USER_DEFINED_ACTION_RESPONSES
 #endif
 #ifdef USE_API_NOISE
  bool send_noise_encryption_set_key_response(const NoiseEncryptionSetKeyRequest &msg) override;
--- a/esphome/components/api/api_pb2.cpp
+++ b/esphome/components/api/api_pb2.cpp
@@ -1010,11 +1010,13 @@ void ListEntitiesServicesResponse::encode(ProtoWriteBuffer buffer) const {
  for (auto &it : this->args) {
    buffer.encode_message(3, it, true);
  }
+  buffer.encode_uint32(4, static_cast<uint32_t>(this->supports_response));
 }
 void ListEntitiesServicesResponse::calculate_size(ProtoSize &size) const {
  size.add_length(1, this->name_ref_.size());
  size.add_fixed32(1, this->key);
  size.add_repeated_message(1, this->args);
+  size.add_uint32(1, static_cast<uint32_t>(this->supports_response));
 }
 bool ExecuteServiceArgument::decode_varint(uint32_t field_id, ProtoVarInt value) {
  switch (field_id) {
@@ -1075,6 +1077,23 @@ 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) {
+  switch (field_id) {
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+    case 3:
+      this->call_id = value.as_uint32();
+      break;
+#endif
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+    case 4:
+      this->return_response = value.as_bool();
+      break;
+#endif
+    default:
+      return false;
+  }
+  return true;
+}
 bool ExecuteServiceRequest::decode_length(uint32_t field_id, ProtoLengthDelimited value) {
  switch (field_id) {
    case 2:
@@ -1102,6 +1121,24 @@ void ExecuteServiceRequest::decode(const uint8_t *buffer, size_t length) {
  ProtoDecodableMessage::decode(buffer, length);
 }
 #endif
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+void ExecuteServiceResponse::encode(ProtoWriteBuffer buffer) const {
+  buffer.encode_uint32(1, this->call_id);
+  buffer.encode_bool(2, this->success);
+  buffer.encode_string(3, this->error_message_ref_);
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+  buffer.encode_bytes(4, this->response_data, this->response_data_len);
+#endif
+}
+void ExecuteServiceResponse::calculate_size(ProtoSize &size) const {
+  size.add_uint32(1, this->call_id);
+  size.add_bool(1, this->success);
+  size.add_length(1, this->error_message_ref_.size());
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+  size.add_length(4, this->response_data_len);
+#endif
+}
+#endif
 #ifdef USE_CAMERA
 void ListEntitiesCameraResponse::encode(ProtoWriteBuffer buffer) const {
  buffer.encode_string(1, this->object_id_ref_);
--- a/esphome/components/api/api_pb2.h
+++ b/esphome/components/api/api_pb2.h
@@ -75,6 +75,12 @@ enum ServiceArgType : uint32_t {
  SERVICE_ARG_TYPE_FLOAT_ARRAY = 6,
  SERVICE_ARG_TYPE_STRING_ARRAY = 7,
 };
+enum SupportsResponseType : uint32_t {
+  SUPPORTS_RESPONSE_NONE = 0,
+  SUPPORTS_RESPONSE_OPTIONAL = 1,
+  SUPPORTS_RESPONSE_ONLY = 2,
+  SUPPORTS_RESPONSE_STATUS = 100,
+};
 #endif
 #ifdef USE_CLIMATE
 enum ClimateMode : uint32_t {
@@ -1257,7 +1263,7 @@ class ListEntitiesServicesArgument final : public ProtoMessage {
 class ListEntitiesServicesResponse final : public ProtoMessage {
 public:
  static constexpr uint8_t MESSAGE_TYPE = 41;
-  static constexpr uint8_t ESTIMATED_SIZE = 48;
+  static constexpr uint8_t ESTIMATED_SIZE = 50;
 #ifdef HAS_PROTO_MESSAGE_DUMP
  const char *message_name() const override { return "list_entities_services_response"; }
 #endif
@@ -1265,6 +1271,7 @@ class ListEntitiesServicesResponse final : public ProtoMessage {
  void set_name(const StringRef &ref) { this->name_ref_ = ref; }
  uint32_t key{0};
  FixedVector<ListEntitiesServicesArgument> args{};
+  enums::SupportsResponseType supports_response{};
  void encode(ProtoWriteBuffer buffer) const override;
  void calculate_size(ProtoSize &size) const override;
 #ifdef HAS_PROTO_MESSAGE_DUMP
@@ -1297,12 +1304,18 @@ class ExecuteServiceArgument final : public ProtoDecodableMessage {
 class ExecuteServiceRequest final : public ProtoDecodableMessage {
 public:
  static constexpr uint8_t MESSAGE_TYPE = 42;
-  static constexpr uint8_t ESTIMATED_SIZE = 39;
+  static constexpr uint8_t ESTIMATED_SIZE = 45;
 #ifdef HAS_PROTO_MESSAGE_DUMP
  const char *message_name() const override { return "execute_service_request"; }
 #endif
  uint32_t key{0};
  FixedVector<ExecuteServiceArgument> args{};
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+  uint32_t call_id{0};
+#endif
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+  bool return_response{false};
+#endif
  void decode(const uint8_t *buffer, size_t length) override;
 #ifdef HAS_PROTO_MESSAGE_DUMP
  void dump_to(std::string &out) const override;
@@ -1311,6 +1324,32 @@ 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;
+};
+#endif
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+class ExecuteServiceResponse final : public ProtoMessage {
+ public:
+  static constexpr uint8_t MESSAGE_TYPE = 131;
+  static constexpr uint8_t ESTIMATED_SIZE = 34;
+#ifdef HAS_PROTO_MESSAGE_DUMP
+  const char *message_name() const override { return "execute_service_response"; }
+#endif
+  uint32_t call_id{0};
+  bool success{false};
+  StringRef error_message_ref_{};
+  void set_error_message(const StringRef &ref) { this->error_message_ref_ = ref; }
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+  const uint8_t *response_data{nullptr};
+  uint16_t response_data_len{0};
+#endif
+  void encode(ProtoWriteBuffer buffer) const override;
+  void calculate_size(ProtoSize &size) const override;
+#ifdef HAS_PROTO_MESSAGE_DUMP
+  void dump_to(std::string &out) const override;
+#endif
+
+ protected:
 };
 #endif
 #ifdef USE_CAMERA
--- a/esphome/components/api/api_pb2_dump.cpp
+++ b/esphome/components/api/api_pb2_dump.cpp
@@ -231,6 +231,20 @@ template<> const char *proto_enum_to_string<enums::ServiceArgType>(enums::Servic
      return "UNKNOWN";
  }
 }
+template<> const char *proto_enum_to_string<enums::SupportsResponseType>(enums::SupportsResponseType value) {
+  switch (value) {
+    case enums::SUPPORTS_RESPONSE_NONE:
+      return "SUPPORTS_RESPONSE_NONE";
+    case enums::SUPPORTS_RESPONSE_OPTIONAL:
+      return "SUPPORTS_RESPONSE_OPTIONAL";
+    case enums::SUPPORTS_RESPONSE_ONLY:
+      return "SUPPORTS_RESPONSE_ONLY";
+    case enums::SUPPORTS_RESPONSE_STATUS:
+      return "SUPPORTS_RESPONSE_STATUS";
+    default:
+      return "UNKNOWN";
+  }
+}
 #endif
 #ifdef USE_CLIMATE
 template<> const char *proto_enum_to_string<enums::ClimateMode>(enums::ClimateMode value) {
@@ -1194,6 +1208,7 @@ void ListEntitiesServicesResponse::dump_to(std::string &out) const {
    it.dump_to(out);
    out.append("\n");
  }
+  dump_field(out, "supports_response", static_cast<enums::SupportsResponseType>(this->supports_response));
 }
 void ExecuteServiceArgument::dump_to(std::string &out) const {
  MessageDumpHelper helper(out, "ExecuteServiceArgument");
@@ -1223,6 +1238,25 @@ void ExecuteServiceRequest::dump_to(std::string &out) const {
    it.dump_to(out);
    out.append("\n");
  }
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+  dump_field(out, "call_id", this->call_id);
+#endif
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+  dump_field(out, "return_response", this->return_response);
+#endif
+}
+#endif
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+void ExecuteServiceResponse::dump_to(std::string &out) const {
+  MessageDumpHelper helper(out, "ExecuteServiceResponse");
+  dump_field(out, "call_id", this->call_id);
+  dump_field(out, "success", this->success);
+  dump_field(out, "error_message", this->error_message_ref_);
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+  out.append("  response_data: ");
+  out.append(format_hex_pretty(this->response_data, this->response_data_len));
+  out.append("\n");
+#endif
 }
 #endif
 #ifdef USE_CAMERA
--- a/esphome/components/api/api_server.cpp
+++ b/esphome/components/api/api_server.cpp
@@ -4,8 +4,8 @@
 #include "api_connection.h"
 #include "esphome/components/network/util.h"
 #include "esphome/core/application.h"
-#include "esphome/core/defines.h"
 #include "esphome/core/controller_registry.h"
+#include "esphome/core/defines.h"
 #include "esphome/core/hal.h"
 #include "esphome/core/log.h"
 #include "esphome/core/util.h"
@@ -186,6 +186,9 @@ void APIServer::loop() {
    // Rare case: handle disconnection
 #ifdef USE_API_CLIENT_DISCONNECTED_TRIGGER
    this->client_disconnected_trigger_->trigger(client->client_info_.name, client->client_info_.peername);
+#endif
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+    this->unregister_active_action_calls_for_connection(client.get());
 #endif
    ESP_LOGV(TAG, "Remove connection %s", client->client_info_.name.c_str());

@@ -585,5 +588,84 @@ bool APIServer::teardown() {
  return this->clients_.empty();
 }

+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+// Timeout for action calls - matches aioesphomeapi client timeout (default 30s)
+// Can be overridden via USE_API_ACTION_CALL_TIMEOUT_MS define for testing
+#ifndef USE_API_ACTION_CALL_TIMEOUT_MS
+#define USE_API_ACTION_CALL_TIMEOUT_MS 30000  // NOLINT
+#endif
+
+uint32_t APIServer::register_active_action_call(uint32_t client_call_id, APIConnection *conn) {
+  uint32_t action_call_id = this->next_action_call_id_++;
+  // Handle wraparound (skip 0 as it means "no call")
+  if (this->next_action_call_id_ == 0) {
+    this->next_action_call_id_ = 1;
+  }
+  this->active_action_calls_.push_back({action_call_id, client_call_id, conn});
+
+  // Schedule automatic cleanup after timeout (client will have given up by then)
+  this->set_timeout(str_sprintf("action_call_%u", action_call_id), USE_API_ACTION_CALL_TIMEOUT_MS,
+                    [this, action_call_id]() {
+                      ESP_LOGD(TAG, "Action call %u timed out", action_call_id);
+                      this->unregister_active_action_call(action_call_id);
+                    });
+
+  return action_call_id;
+}
+
+void APIServer::unregister_active_action_call(uint32_t action_call_id) {
+  // Cancel the timeout for this action call
+  this->cancel_timeout(str_sprintf("action_call_%u", action_call_id));
+
+  // Swap-and-pop is more efficient than remove_if for unordered vectors
+  for (size_t i = 0; i < this->active_action_calls_.size(); i++) {
+    if (this->active_action_calls_[i].action_call_id == action_call_id) {
+      std::swap(this->active_action_calls_[i], this->active_action_calls_.back());
+      this->active_action_calls_.pop_back();
+      return;
+    }
+  }
+}
+
+void APIServer::unregister_active_action_calls_for_connection(APIConnection *conn) {
+  // Remove all active action calls for disconnected connection using swap-and-pop
+  for (size_t i = 0; i < this->active_action_calls_.size();) {
+    if (this->active_action_calls_[i].connection == conn) {
+      // Cancel the timeout for this action call
+      this->cancel_timeout(str_sprintf("action_call_%u", this->active_action_calls_[i].action_call_id));
+
+      std::swap(this->active_action_calls_[i], this->active_action_calls_.back());
+      this->active_action_calls_.pop_back();
+      // Don't increment i - need to check the swapped element
+    } else {
+      i++;
+    }
+  }
+}
+
+void APIServer::send_action_response(uint32_t action_call_id, bool success, const std::string &error_message) {
+  for (auto &call : this->active_action_calls_) {
+    if (call.action_call_id == action_call_id) {
+      call.connection->send_execute_service_response(call.client_call_id, success, error_message);
+      return;
+    }
+  }
+  ESP_LOGW(TAG, "Cannot send response: no active call found for action_call_id %u", action_call_id);
+}
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+void APIServer::send_action_response(uint32_t action_call_id, bool success, const std::string &error_message,
+                                     const uint8_t *response_data, size_t response_data_len) {
+  for (auto &call : this->active_action_calls_) {
+    if (call.action_call_id == action_call_id) {
+      call.connection->send_execute_service_response(call.client_call_id, success, error_message, response_data,
+                                                     response_data_len);
+      return;
+    }
+  }
+  ESP_LOGW(TAG, "Cannot send response: no active call found for action_call_id %u", action_call_id);
+}
+#endif  // USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+#endif  // USE_API_USER_DEFINED_ACTION_RESPONSES
+
 }  // namespace esphome::api
 #endif
--- a/esphome/components/api/api_server.h
+++ b/esphome/components/api/api_server.h
@@ -12,9 +12,6 @@
 #include "esphome/core/log.h"
 #include "list_entities.h"
 #include "subscribe_state.h"
-#ifdef USE_API_USER_DEFINED_ACTIONS
-#include "user_services.h"
-#endif
 #ifdef USE_LOGGER
 #include "esphome/components/logger/logger.h"
 #endif
@@ -22,11 +19,15 @@
 #include "esphome/components/camera/camera.h"
 #endif

-#include <map>
 #include <vector>

 namespace esphome::api {

+#ifdef USE_API_USER_DEFINED_ACTIONS
+// Forward declaration - full definition in user_services.h
+class UserServiceDescriptor;
+#endif
+
 #ifdef USE_API_NOISE
 struct SavedNoisePsk {
  psk_t psk;
@@ -154,6 +155,19 @@ class APIServer : public Component,
  // Only compile push_back method when custom_services: true (external components)
  void register_user_service(UserServiceDescriptor *descriptor) { this->user_services_.push_back(descriptor); }
 #endif
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+  // Action call context management - supports concurrent calls from multiple clients
+  // Returns server-generated action_call_id to avoid collisions when clients use same call_id
+  uint32_t register_active_action_call(uint32_t client_call_id, APIConnection *conn);
+  void unregister_active_action_call(uint32_t action_call_id);
+  void unregister_active_action_calls_for_connection(APIConnection *conn);
+  // Send response for a specific action call (uses action_call_id, sends client_call_id in response)
+  void send_action_response(uint32_t action_call_id, bool success, const std::string &error_message);
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+  void send_action_response(uint32_t action_call_id, bool success, const std::string &error_message,
+                            const uint8_t *response_data, size_t response_data_len);
+#endif  // USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+#endif  // USE_API_USER_DEFINED_ACTION_RESPONSES
 #endif
 #ifdef USE_HOMEASSISTANT_TIME
  void request_time();
@@ -230,6 +244,17 @@ class APIServer : public Component,
 #endif
 #ifdef USE_API_USER_DEFINED_ACTIONS
  std::vector<UserServiceDescriptor *> user_services_;
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+  // Active action calls - supports concurrent calls from multiple clients
+  // Uses server-generated action_call_id to avoid collisions when multiple clients use same call_id
+  struct ActiveActionCall {
+    uint32_t action_call_id;  // Server-generated unique ID (passed to actions)
+    uint32_t client_call_id;  // Client's original call_id (used in response)
+    APIConnection *connection;
+  };
+  std::vector<ActiveActionCall> active_action_calls_;
+  uint32_t next_action_call_id_{1};  // Counter for generating unique action_call_ids
+#endif                               // USE_API_USER_DEFINED_ACTION_RESPONSES
 #endif
 #ifdef USE_API_HOMEASSISTANT_ACTION_RESPONSES
  struct PendingActionResponse {
--- a/esphome/components/api/custom_api_device.h
+++ b/esphome/components/api/custom_api_device.h
@@ -16,7 +16,10 @@ template<typename T, typename... Ts> class CustomAPIDeviceService : public UserS
      : UserServiceDynamic<Ts...>(name, arg_names), obj_(obj), callback_(callback) {}

 protected:
-  void execute(Ts... x) override { (this->obj_->*this->callback_)(x...); }  // NOLINT
+  // CustomAPIDevice services don't support action responses - ignore call_id and return_response
+  void execute(uint32_t /*call_id*/, bool /*return_response*/, Ts... x) override {
+    (this->obj_->*this->callback_)(x...);  // NOLINT
+  }

  T *obj_;
  void (T::*callback_)(Ts...);
--- a/esphome/components/api/list_entities.cpp
+++ b/esphome/components/api/list_entities.cpp
@@ -5,6 +5,9 @@
 #include "esphome/core/application.h"
 #include "esphome/core/log.h"
 #include "esphome/core/util.h"
+#ifdef USE_API_USER_DEFINED_ACTIONS
+#include "user_services.h"
+#endif

 namespace esphome::api {

--- a/esphome/components/api/user_services.h
+++ b/esphome/components/api/user_services.h
@@ -1,20 +1,31 @@
 #pragma once

+#include <tuple>
 #include <utility>
 #include <vector>

-#include "esphome/core/component.h"
-#include "esphome/core/automation.h"
 #include "api_pb2.h"
+#include "esphome/core/automation.h"
+#include "esphome/core/component.h"
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+#include "esphome/components/json/json_util.h"
+#endif

 #ifdef USE_API_USER_DEFINED_ACTIONS
 namespace esphome::api {

+// Forward declaration - full definition in api_server.h
+class APIServer;
+
 class UserServiceDescriptor {
 public:
  virtual ListEntitiesServicesResponse encode_list_service_response() = 0;

  virtual bool execute_service(const ExecuteServiceRequest &req) = 0;
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+  // Overload that accepts server-generated action_call_id (avoids client call_id collisions)
+  virtual bool execute_service(const ExecuteServiceRequest &req, uint32_t action_call_id) = 0;
+#endif

  bool is_internal() { return false; }
 };
@@ -27,8 +38,9 @@ template<typename T> enums::ServiceArgType to_service_arg_type();
 // Stores only pointers to string literals in flash - no heap allocation
 template<typename... Ts> class UserServiceBase : public UserServiceDescriptor {
 public:
-  UserServiceBase(const char *name, const std::array<const char *, sizeof...(Ts)> &arg_names)
-      : name_(name), arg_names_(arg_names) {
+  UserServiceBase(const char *name, const std::array<const char *, sizeof...(Ts)> &arg_names,
+                  enums::SupportsResponseType supports_response = enums::SUPPORTS_RESPONSE_NONE)
+      : name_(name), arg_names_(arg_names), supports_response_(supports_response) {
    this->key_ = fnv1_hash(name);
  }

@@ -36,6 +48,7 @@ template<typename... Ts> class UserServiceBase : public UserServiceDescriptor {
    ListEntitiesServicesResponse msg;
    msg.set_name(StringRef(this->name_));
    msg.key = this->key_;
+    msg.supports_response = this->supports_response_;
    std::array<enums::ServiceArgType, sizeof...(Ts)> arg_types = {to_service_arg_type<Ts>()...};
    msg.args.init(sizeof...(Ts));
    for (size_t i = 0; i < sizeof...(Ts); i++) {
@@ -51,21 +64,37 @@ template<typename... Ts> class UserServiceBase : public UserServiceDescriptor {
      return false;
    if (req.args.size() != sizeof...(Ts))
      return false;
-    this->execute_(req.args, std::make_index_sequence<sizeof...(Ts)>{});
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+    this->execute_(req.args, req.call_id, req.return_response, std::make_index_sequence<sizeof...(Ts)>{});
+#else
+    this->execute_(req.args, 0, false, std::make_index_sequence<sizeof...(Ts)>{});
+#endif
    return true;
  }

+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+  bool execute_service(const ExecuteServiceRequest &req, uint32_t action_call_id) override {
+    if (req.key != this->key_)
+      return false;
+    if (req.args.size() != sizeof...(Ts))
+      return false;
+    this->execute_(req.args, action_call_id, req.return_response, std::make_index_sequence<sizeof...(Ts)>{});
+    return true;
+  }
+#endif
+
 protected:
-  virtual void execute(Ts... x) = 0;
+  virtual void execute(uint32_t call_id, bool return_response, Ts... x) = 0;
  template<typename ArgsContainer, size_t... S>
-  void execute_(const ArgsContainer &args, std::index_sequence<S...> type) {
-    this->execute((get_execute_arg_value<Ts>(args[S]))...);
+  void execute_(const ArgsContainer &args, uint32_t call_id, bool return_response, std::index_sequence<S...> /*type*/) {
+    this->execute(call_id, return_response, (get_execute_arg_value<Ts>(args[S]))...);
  }

  // Pointers to string literals in flash - no heap allocation
  const char *name_;
  std::array<const char *, sizeof...(Ts)> arg_names_;
  uint32_t key_{0};
+  enums::SupportsResponseType supports_response_{enums::SUPPORTS_RESPONSE_NONE};
 };

 // Separate class for custom_api_device services (rare case)
@@ -81,6 +110,7 @@ template<typename... Ts> class UserServiceDynamic : public UserServiceDescriptor
    ListEntitiesServicesResponse msg;
    msg.set_name(StringRef(this->name_));
    msg.key = this->key_;
+    msg.supports_response = enums::SUPPORTS_RESPONSE_NONE;  // Dynamic services don't support responses yet
    std::array<enums::ServiceArgType, sizeof...(Ts)> arg_types = {to_service_arg_type<Ts>()...};
    msg.args.init(sizeof...(Ts));
    for (size_t i = 0; i < sizeof...(Ts); i++) {
@@ -96,15 +126,31 @@ template<typename... Ts> class UserServiceDynamic : public UserServiceDescriptor
      return false;
    if (req.args.size() != sizeof...(Ts))
      return false;
-    this->execute_(req.args, std::make_index_sequence<sizeof...(Ts)>{});
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+    this->execute_(req.args, req.call_id, req.return_response, std::make_index_sequence<sizeof...(Ts)>{});
+#else
+    this->execute_(req.args, 0, false, std::make_index_sequence<sizeof...(Ts)>{});
+#endif
    return true;
  }

+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+  // Dynamic services don't support responses yet, but need to implement the interface
+  bool execute_service(const ExecuteServiceRequest &req, uint32_t action_call_id) override {
+    if (req.key != this->key_)
+      return false;
+    if (req.args.size() != sizeof...(Ts))
+      return false;
+    this->execute_(req.args, action_call_id, req.return_response, std::make_index_sequence<sizeof...(Ts)>{});
+    return true;
+  }
+#endif
+
 protected:
-  virtual void execute(Ts... x) = 0;
+  virtual void execute(uint32_t call_id, bool return_response, Ts... x) = 0;
  template<typename ArgsContainer, size_t... S>
-  void execute_(const ArgsContainer &args, std::index_sequence<S...> type) {
-    this->execute((get_execute_arg_value<Ts>(args[S]))...);
+  void execute_(const ArgsContainer &args, uint32_t call_id, bool return_response, std::index_sequence<S...> /*type*/) {
+    this->execute(call_id, return_response, (get_execute_arg_value<Ts>(args[S]))...);
  }

  // Heap-allocated strings for runtime-generated names
@@ -113,15 +159,149 @@ template<typename... Ts> class UserServiceDynamic : public UserServiceDescriptor
  uint32_t key_{0};
 };

-template<typename... Ts> class UserServiceTrigger : public UserServiceBase<Ts...>, public Trigger<Ts...> {
+// Primary template declaration
+template<enums::SupportsResponseType Mode, typename... Ts> class UserServiceTrigger;
+
+// Specialization for NONE - no extra trigger arguments
+template<typename... Ts>
+class UserServiceTrigger<enums::SUPPORTS_RESPONSE_NONE, Ts...> : public UserServiceBase<Ts...>, public Trigger<Ts...> {
 public:
-  // Constructor for static names (YAML-defined services - used by code generator)
  UserServiceTrigger(const char *name, const std::array<const char *, sizeof...(Ts)> &arg_names)
-      : UserServiceBase<Ts...>(name, arg_names) {}
+      : UserServiceBase<Ts...>(name, arg_names, enums::SUPPORTS_RESPONSE_NONE) {}

 protected:
-  void execute(Ts... x) override { this->trigger(x...); }  // NOLINT
+  void execute(uint32_t /*call_id*/, bool /*return_response*/, Ts... x) override { this->trigger(x...); }
+};
+
+// Specialization for OPTIONAL - call_id and return_response trigger arguments
+template<typename... Ts>
+class UserServiceTrigger<enums::SUPPORTS_RESPONSE_OPTIONAL, Ts...> : public UserServiceBase<Ts...>,
+                                                                     public Trigger<uint32_t, bool, Ts...> {
+ public:
+  UserServiceTrigger(const char *name, const std::array<const char *, sizeof...(Ts)> &arg_names)
+      : UserServiceBase<Ts...>(name, arg_names, enums::SUPPORTS_RESPONSE_OPTIONAL) {}
+
+ protected:
+  void execute(uint32_t call_id, bool return_response, Ts... x) override {
+    this->trigger(call_id, return_response, x...);
+  }
+};
+
+// Specialization for ONLY - just call_id trigger argument
+template<typename... Ts>
+class UserServiceTrigger<enums::SUPPORTS_RESPONSE_ONLY, Ts...> : public UserServiceBase<Ts...>,
+                                                                 public Trigger<uint32_t, Ts...> {
+ public:
+  UserServiceTrigger(const char *name, const std::array<const char *, sizeof...(Ts)> &arg_names)
+      : UserServiceBase<Ts...>(name, arg_names, enums::SUPPORTS_RESPONSE_ONLY) {}
+
+ protected:
+  void execute(uint32_t call_id, bool /*return_response*/, Ts... x) override { this->trigger(call_id, x...); }
+};
+
+// Specialization for STATUS - just call_id trigger argument (reports success/error without data)
+template<typename... Ts>
+class UserServiceTrigger<enums::SUPPORTS_RESPONSE_STATUS, Ts...> : public UserServiceBase<Ts...>,
+                                                                   public Trigger<uint32_t, Ts...> {
+ public:
+  UserServiceTrigger(const char *name, const std::array<const char *, sizeof...(Ts)> &arg_names)
+      : UserServiceBase<Ts...>(name, arg_names, enums::SUPPORTS_RESPONSE_STATUS) {}
+
+ protected:
+  void execute(uint32_t call_id, bool /*return_response*/, Ts... x) override { this->trigger(call_id, x...); }
 };

 }  // namespace esphome::api
 #endif  // USE_API_USER_DEFINED_ACTIONS
+
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
+// Include full definition of APIServer for template implementation
+// Must be outside namespace to avoid including STL headers inside namespace
+#include "api_server.h"
+
+namespace esphome::api {
+
+template<typename... Ts> class APIRespondAction : public Action<Ts...> {
+ public:
+  explicit APIRespondAction(APIServer *parent) : parent_(parent) {}
+
+  template<typename V> void set_success(V success) { this->success_ = success; }
+  template<typename V> void set_error_message(V error) { this->error_message_ = error; }
+  void set_is_optional_mode(bool is_optional) { this->is_optional_mode_ = is_optional; }
+
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+  void set_data(std::function<void(Ts..., JsonObject)> func) {
+    this->json_builder_ = std::move(func);
+    this->has_data_ = true;
+  }
+#endif
+
+  void play(const Ts &...x) override {
+    // Extract call_id from first argument - it's always first for optional/only/status modes
+    auto args = std::make_tuple(x...);
+    uint32_t call_id = std::get<0>(args);
+
+    bool success = this->success_.value(x...);
+    std::string error_message = this->error_message_.value(x...);
+
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+    if (this->has_data_) {
+      // For optional mode, check return_response (second arg) to decide if client wants data
+      // Use nested if constexpr to avoid compile error when tuple doesn't have enough elements
+      // (std::tuple_element_t is evaluated before the && short-circuit, so we must nest)
+      if constexpr (sizeof...(Ts) >= 2) {
+        if constexpr (std::is_same_v<std::tuple_element_t<1, std::tuple<Ts...>>, bool>) {
+          if (this->is_optional_mode_) {
+            bool return_response = std::get<1>(args);
+            if (!return_response) {
+              // Client doesn't want response data, just send success/error
+              this->parent_->send_action_response(call_id, success, error_message);
+              return;
+            }
+          }
+        }
+      }
+      // Build and send JSON response
+      json::JsonBuilder builder;
+      this->json_builder_(x..., builder.root());
+      std::string json_str = builder.serialize();
+      this->parent_->send_action_response(call_id, success, error_message,
+                                          reinterpret_cast<const uint8_t *>(json_str.data()), json_str.size());
+      return;
+    }
+#endif
+    this->parent_->send_action_response(call_id, success, error_message);
+  }
+
+ protected:
+  APIServer *parent_;
+  TemplatableValue<bool, Ts...> success_{true};
+  TemplatableValue<std::string, Ts...> error_message_{""};
+#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
+  std::function<void(Ts..., JsonObject)> json_builder_;
+  bool has_data_{false};
+#endif
+  bool is_optional_mode_{false};
+};
+
+// Action to unregister a service call after execution completes
+// Automatically appended to the end of action lists for non-none response modes
+template<typename... Ts> class APIUnregisterServiceCallAction : public Action<Ts...> {
+ public:
+  explicit APIUnregisterServiceCallAction(APIServer *parent) : parent_(parent) {}
+
+  void play(const Ts &...x) override {
+    // Extract call_id from first argument - same convention as APIRespondAction
+    auto args = std::make_tuple(x...);
+    uint32_t call_id = std::get<0>(args);
+    if (call_id != 0) {
+      this->parent_->unregister_active_action_call(call_id);
+    }
+  }
+
+ protected:
+  APIServer *parent_;
+};
+
+}  // namespace esphome::api
+#endif  // USE_API_USER_DEFINED_ACTION_RESPONSES