diff --git a/google/devtools/clouddebugger/v2/controller.proto b/google/devtools/clouddebugger/v2/controller.proto
new file mode 100644
index 000000000..be1bff7f0
--- /dev/null
+++ b/google/devtools/clouddebugger/v2/controller.proto
@@ -0,0 +1,157 @@
+// Copyright (c) 2015, Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package google.devtools.clouddebugger.v2;
+
+import "google/api/annotations.proto";
+import "google/devtools/clouddebugger/v2/data.proto";
+import "google/protobuf/empty.proto";
+
+option java_multiple_files = true;
+option java_outer_classname = "ControllerProto";
+option java_package = "com.google.devtools.clouddebugger.v2";
+
+
+// The Controller service provides the API for orchestrating a collection of
+// debugger agents to perform debugging tasks. These agents are each attached
+// to a process of an application which may include one or more replicas.
+//
+// The debugger agents register with the Controller to identify the application
+// being debugged, the Debuggee. All agents that register with the same data,
+// represent the same Debuggee, and are assigned the same `debuggee_id`.
+//
+// The debugger agents call the Controller to retrieve  the list of active
+// Breakpoints. Agents with the same `debuggee_id` get the same breakpoints
+// list. An agent that can fulfill the breakpoint request updates the
+// Controller with the breakpoint result. The controller selects the first
+// result received and discards the rest of the results.
+// Agents that poll again for active breakpoints will no longer have
+// the completed breakpoint in the list and should remove that breakpoint from
+// their attached process.
+//
+// The Controller service does not provide a way to retrieve the results of
+// a completed breakpoint. This functionality is available using the Debugger
+// service.
+service Controller2 {
+  // Registers the debuggee with the controller service.
+  //
+  // All agents attached to the same application should call this method with
+  // the same request content to get back the same stable `debuggee_id`. Agents
+  // should call this method again whenever `google.rpc.Code.NOT_FOUND` is
+  // returned from any controller method.
+  //
+  // This allows the controller service to disable the agent or recover from any
+  // data loss. If the debuggee is disabled by the server, the response will
+  // have `is_disabled` set to `true`.
+  rpc RegisterDebuggee(RegisterDebuggeeRequest) returns (RegisterDebuggeeResponse) {
+    option (google.api.http) = { post: "/v2/controller/debuggees/register" body: "*" };
+  }
+
+  // Returns the list of all active breakpoints for the debuggee.
+  //
+  // The breakpoint specification (location, condition, and expression
+  // fields) is semantically immutable, although the field values may
+  // change. For example, an agent may update the location line number
+  // to reflect the actual line where the breakpoint was set, but this
+  // doesn't change the breakpoint semantics.
+  //
+  // This means that an agent does not need to check if a breakpoint has changed
+  // when it encounters the same breakpoint on a successive call.
+  // Moreover, an agent should remember the breakpoints that are completed
+  // until the controller removes them from the active list to avoid
+  // setting those breakpoints again.
+  rpc ListActiveBreakpoints(ListActiveBreakpointsRequest) returns (ListActiveBreakpointsResponse) {
+    option (google.api.http) = { get: "/v2/controller/debuggees/{debuggee_id}/breakpoints" };
+  }
+
+  // Updates the breakpoint state or mutable fields.
+  // The entire Breakpoint message must be sent back to the controller
+  // service.
+  //
+  // Updates to active breakpoint fields are only allowed if the new value
+  // does not change the breakpoint specification. Updates to the `location`,
+  // `condition` and `expression` fields should not alter the breakpoint
+  // semantics. These may only make changes such as canonicalizing a value
+  // or snapping the location to the correct line of code.
+  rpc UpdateActiveBreakpoint(UpdateActiveBreakpointRequest) returns (UpdateActiveBreakpointResponse) {
+    option (google.api.http) = { put: "/v2/controller/debuggees/{debuggee_id}/breakpoints/{breakpoint.id}" body: "*" };
+  }
+}
+
+// Request to register a debuggee.
+message RegisterDebuggeeRequest {
+  // Debuggee information to register.
+  // The fields `project`, `uniquifier`, `description` and `agent_version`
+  // of the debuggee must be set.
+  Debuggee debuggee = 1;
+}
+
+// Response for registering a debuggee.
+message RegisterDebuggeeResponse {
+  // Debuggee resource.
+  // The field `id` is guranteed to be set (in addition to the echoed fields).
+  Debuggee debuggee = 1;
+}
+
+// Request to list active breakpoints.
+message ListActiveBreakpointsRequest {
+  // Identifies the debuggee.
+  string debuggee_id = 1;
+
+  // A wait token that, if specified, blocks the method call until the list
+  // of active breakpoints has changed, or a server selected timeout has
+  // expired.  The value should be set from the last returned response.
+  string wait_token = 2;
+
+  // If set to `true`, returns `google.rpc.Code.OK` status and sets the
+  // `wait_expired` response field to `true` when the server-selected timeout
+  // has expired (recommended).
+  //
+  // If set to `false`, returns `google.rpc.Code.ABORTED` status when the
+  // server-selected timeout has expired (deprecated).
+  bool success_on_timeout = 3;
+}
+
+// Response for listing active breakpoints.
+message ListActiveBreakpointsResponse {
+  // List of all active breakpoints.
+  // The fields `id` and `location` are guaranteed to be set on each breakpoint.
+  repeated Breakpoint breakpoints = 1;
+
+  // A wait token that can be used in the next method call to block until
+  // the list of breakpoints changes.
+  string next_wait_token = 2;
+
+  // The `wait_expired` field is set to true by the server when the
+  // request times out and the field `success_on_timeout` is set to true.
+  bool wait_expired = 3;
+}
+
+// Request to update an active breakpoint.
+message UpdateActiveBreakpointRequest {
+  // Identifies the debuggee being debugged.
+  string debuggee_id = 1;
+
+  // Updated breakpoint information.
+  // The field 'id' must be set.
+  Breakpoint breakpoint = 2;
+}
+
+// Response for updating an active breakpoint.
+// The message is defined to allow future extensions.
+message UpdateActiveBreakpointResponse {
+
+}
diff --git a/google/devtools/clouddebugger/v2/data.proto b/google/devtools/clouddebugger/v2/data.proto
new file mode 100644
index 000000000..950dddb69
--- /dev/null
+++ b/google/devtools/clouddebugger/v2/data.proto
@@ -0,0 +1,444 @@
+// Copyright (c) 2015, Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package google.devtools.clouddebugger.v2;
+
+import "google/api/annotations.proto";
+import "google/devtools/source/v1/source_context.proto";
+import "google/protobuf/timestamp.proto";
+import "google/protobuf/wrappers.proto";
+
+option java_multiple_files = true;
+option java_outer_classname = "DataProto";
+option java_package = "com.google.devtools.clouddebugger.v2";
+
+
+// Represents a message with parameters.
+message FormatMessage {
+  // Format template for the message. The `format` uses placeholders `$0`,
+  // `$1`, etc. to reference parameters. `$$` can be used to denote the `$`
+  // character.
+  //
+  // Examples:
+  //
+  // *   `Failed to load '$0' which helps debug $1 the first time it
+  //     is loaded.  Again, $0 is very important.`
+  // *   `Please pay $$10 to use $0 instead of $1.`
+  string format = 1;
+
+  // Optional parameters to be embedded into the message.
+  repeated string parameters = 2;
+}
+
+// Represents a contextual status message.
+// The message can indicate an error or informational status, and refer to
+// specific parts of the containing object.
+// For example, the `Breakpoint.status` field can indicate an error referring
+// to the `BREAKPOINT_SOURCE_LOCATION` with the message `Location not found`.
+message StatusMessage {
+  // Enumerates references to which the message applies.
+  enum Reference {
+    // Status doesn't refer to any particular input.
+    UNSPECIFIED = 0;
+
+    // Status applies to the breakpoint and is related to its location.
+    BREAKPOINT_SOURCE_LOCATION = 3;
+
+    // Status applies to the breakpoint and is related to its condition.
+    BREAKPOINT_CONDITION = 4;
+
+    // Status applies to the breakpoint and is related to its expressions.
+    BREAKPOINT_EXPRESSION = 7;
+
+    // Status applies to the entire variable.
+    VARIABLE_NAME = 5;
+
+    // Status applies to variable value (variable name is valid).
+    VARIABLE_VALUE = 6;
+  }
+
+  // Distinguishes errors from informational messages.
+  bool is_error = 1;
+
+  // Reference to which the message applies.
+  Reference refers_to = 2;
+
+  // Status message text.
+  FormatMessage description = 3;
+}
+
+// Represents a location in the source code.
+message SourceLocation {
+  // Path to the source file within the source context of the target binary.
+  string path = 1;
+
+  // Line inside the file. The first line in the file has the value `1`.
+  int32 line = 2;
+}
+
+// Represents a variable or an argument possibly of a compound object type.
+// Note how the following variables are represented:
+//
+// 1) A simple variable:
+//
+//     int x = 5
+//
+//     { name: "x", value: "5", type: "int" }  // Captured variable
+//
+// 2) A compound object:
+//
+//     struct T {
+//         int m1;
+//         int m2;
+//     };
+//     T x = { 3, 7 };
+//
+//     {  // Captured variable
+//         name: "x",
+//         type: "T",
+//         members { name: "m1", value: "3", type: "int" },
+//         members { name: "m2", value: "7", type: "int" }
+//     }
+//
+// 3) A pointer where the pointee was captured:
+//
+//     T x = { 3, 7 };
+//     T* p = &x;
+//
+//     {   // Captured variable
+//         name: "p",
+//         type: "T*",
+//         value: "0x00500500",
+//         members { name: "m1", value: "3", type: "int" },
+//         members { name: "m2", value: "7", type: "int" }
+//     }
+//
+// 4) A pointer where the pointee was not captured:
+//
+//     T* p = new T;
+//
+//     {   // Captured variable
+//         name: "p",
+//         type: "T*",
+//         value: "0x00400400"
+//         status { is_error: true, description { format: "unavailable" } }
+//     }
+//
+// The status should describe the reason for the missing value,
+// such as `<optimized out>`, `<inaccessible>`, `<pointers limit reached>`.
+//
+// Note that a null pointer should not have members.
+//
+// 5) An unnamed value:
+//
+//     int* p = new int(7);
+//
+//     {   // Captured variable
+//         name: "p",
+//         value: "0x00500500",
+//         type: "int*",
+//         members { value: "7", type: "int" } }
+//
+// 6) An unnamed pointer where the pointee was not captured:
+//
+//     int* p = new int(7);
+//     int** pp = &p;
+//
+//     {  // Captured variable
+//         name: "pp",
+//         value: "0x00500500",
+//         type: "int**",
+//         members {
+//             value: "0x00400400",
+//             type: "int*"
+//             status {
+//                 is_error: true,
+//                 description: { format: "unavailable" } }
+//             }
+//         }
+//     }
+//
+// To optimize computation, memory and network traffic, variables that
+// repeat in the output multiple times can be stored once in a shared
+// variable table and be referenced using the `var_table_index` field.  The
+// variables stored in the shared table are nameless and are essentially
+// a partition of the complete variable. To reconstruct the complete
+// variable, merge the referencing variable with the referenced variable.
+//
+// When using the shared variable table, the following variables:
+//
+//     T x = { 3, 7 };
+//     T* p = &x;
+//     T& r = x;
+//
+//     { name: "x", var_table_index: 3, type: "T" }  // Captured variables
+//     { name: "p", value "0x00500500", type="T*", var_table_index: 3 }
+//     { name: "r", type="T&", var_table_index: 3 }
+//
+//     {  // Shared variable table entry #3:
+//         members { name: "m1", value: "3", type: "int" },
+//         members { name: "m2", value: "7", type: "int" }
+//     }
+//
+// Note that the pointer address is stored with the referencing variable
+// and not with the referenced variable. This allows the referenced variable
+// to be shared between pointers and references.
+//
+// The type field is optional. The debugger agent may or may not support it.
+message Variable {
+  // Name of the variable, if any.
+  string name = 1;
+
+  // Simple value of the variable.
+  string value = 2;
+
+  // Variable type (e.g. `MyClass`). If the variable is split with
+  // `var_table_index`, `type` goes next to `value`. The interpretation of
+  // a type is agent specific. It is recommended to include the dynamic type
+  // rather than a static type of an object.
+  string type = 6;
+
+  // Members contained or pointed to by the variable.
+  repeated Variable members = 3;
+
+  // Reference to a variable in the shared variable table. More than
+  // one variable can reference the same variable in the table. The
+  // `var_table_index` field is an index into `variable_table` in Breakpoint.
+  google.protobuf.Int32Value var_table_index = 4;
+
+  // Status associated with the variable. This field will usually stay
+  // unset. A status of a single variable only applies to that variable or
+  // expression. The rest of breakpoint data still remains valid. Variables
+  // might be reported in error state even when breakpoint is not in final
+  // state.
+  //
+  // The message may refer to variable name with `refers_to` set to
+  // `VARIABLE_NAME`. Alternatively `refers_to` will be set to `VARIABLE_VALUE`.
+  // In either case variable value and members will be unset.
+  //
+  // Example of error message applied to name: `Invalid expression syntax`.
+  //
+  // Example of information message applied to value: `Not captured`.
+  //
+  // Examples of error message applied to value:
+  //
+  // *   `Malformed string`,
+  // *   `Field f not found in class C`
+  // *   `Null pointer dereference`
+  StatusMessage status = 5;
+}
+
+// Represents a stack frame context.
+message StackFrame {
+  // Demangled function name at the call site.
+  string function = 1;
+
+  // Source location of the call site.
+  SourceLocation location = 2;
+
+  // Set of arguments passed to this function.
+  // Note that this might not be populated for all stack frames.
+  repeated Variable arguments = 3;
+
+  // Set of local variables at the stack frame location.
+  // Note that this might not be populated for all stack frames.
+  repeated Variable locals = 4;
+}
+
+// Represents the breakpoint specification, status and results.
+message Breakpoint {
+  // Actions that can be taken when a breakpoint hits.
+  // Agents should reject breakpoints with unsupported or unknown action values.
+  enum Action {
+    // Capture stack frame and variables and update the breakpoint.
+    // The data is only captured once. After that the breakpoint is set
+    // in a final state.
+    CAPTURE = 0;
+
+    // Log each breakpoint hit. The breakpoint remains active until
+    // deleted or expired.
+    LOG = 1;
+  }
+
+  // Log severity levels.
+  enum LogLevel {
+    // Information log message.
+    INFO = 0;
+
+    // Warning log message.
+    WARNING = 1;
+
+    // Error log message.
+    ERROR = 2;
+  }
+
+  // Breakpoint identifier, unique in the scope of the debuggee.
+  string id = 1;
+
+  // Action that the agent should perform when the code at the
+  // breakpoint location is hit.
+  Action action = 13;
+
+  // Breakpoint source location.
+  SourceLocation location = 2;
+
+  // Condition that triggers the breakpoint.
+  // The condition is a compound boolean expression composed using expressions
+  // in a programming language at the source location.
+  string condition = 3;
+
+  // List of read-only expressions to evaluate at the breakpoint location.
+  // The expressions are composed using expressions in the programming language
+  // at the source location. If the breakpoint action is `LOG`, the evaluated
+  // expressions are included in log statements.
+  repeated string expressions = 4;
+
+  // Only relevant when action is `LOG`. Defines the message to log when
+  // the breakpoint hits. The message may include parameter placeholders `$0`,
+  // `$1`, etc. These placeholders are replaced with the evaluated value
+  // of the appropriate expression. Expressions not referenced in
+  // `log_message_format` are not logged.
+  //
+  // Example: `Message received, id = $0, count = $1` with
+  // `expressions` = `[ message.id, message.count ]`.
+  string log_message_format = 14;
+
+  // Indicates the severity of the log. Only relevant when action is `LOG`.
+  LogLevel log_level = 15;
+
+  // When true, indicates that this is a final result and the
+  // breakpoint state will not change from here on.
+  bool is_final_state = 5;
+
+  // Time this breakpoint was created by the server in seconds resolution.
+  google.protobuf.Timestamp create_time = 11;
+
+  // Time this breakpoint was finalized as seen by the server in seconds
+  // resolution.
+  google.protobuf.Timestamp final_time = 12;
+
+  // E-mail address of the user that created this breakpoint
+  string user_email = 16;
+
+  // Breakpoint status.
+  //
+  // The status includes an error flag and a human readable message.
+  // This field is usually unset. The message can be either
+  // informational or an error message. Regardless, clients should always
+  // display the text message back to the user.
+  //
+  // Error status indicates complete failure of the breakpoint.
+  //
+  // Example (non-final state): `Still loading symbols...`
+  //
+  // Examples (final state):
+  //
+  // *   `Invalid line number` referring to location
+  // *   `Field f not found in class C` referring to condition
+  StatusMessage status = 10;
+
+  // The stack at breakpoint time.
+  repeated StackFrame stack_frames = 7;
+
+  // Values of evaluated expressions at breakpoint time.
+  // The evaluated expressions appear in exactly the same order they
+  // are listed in the `expressions` field.
+  // The `name` field holds the original expression text, the `value` or
+  // `members` field holds the result of the evaluated expression.
+  // If the expression cannot be evaluated, the `status` inside the `Variable`
+  // will indicate an error and contain the error text.
+  repeated Variable evaluated_expressions = 8;
+
+  // The `variable_table` exists to aid with computation, memory and network
+  // traffic optimization.  It enables storing a variable once and reference
+  // it from multiple variables, including variables stored in the
+  // `variable_table` itself.
+  // For example, the same `this` object, which may appear at many levels of
+  // the stack, can have all of its data stored once in this table.  The
+  // stack frame variables then would hold only a reference to it.
+  //
+  // The variable `var_table_index` field is an index into this repeated field.
+  // The stored objects are nameless and get their name from the referencing
+  // variable. The effective variable is a merge of the referencing variable
+  // and the referenced variable.
+  repeated Variable variable_table = 9;
+
+  // A set of custom breakpoint properties, populated by the agent, to be
+  // displayed to the user.
+  map<string, string> labels = 17;
+}
+
+// Represents the application to debug. The application may include one or more
+// replicated processes executing the same code. Each of these processes is
+// attached with a debugger agent, carrying out the debugging commands.
+// The agents attached to the same debuggee are identified by using exactly the
+// same field values when registering.
+message Debuggee {
+  // Unique identifier for the debuggee generated by the controller service.
+  string id = 1;
+
+  // Project the debuggee is associated with.
+  // Use the project number when registering a Google Cloud Platform project.
+  string project = 2;
+
+  // Debuggee uniquifier within the project.
+  // Any string that identifies the application within the project can be used.
+  // Including environment and version or build IDs is recommended.
+  string uniquifier = 3;
+
+  // Human readable description of the debuggee.
+  // Including a human-readable project name, environment name and version
+  // information is recommended.
+  string description = 4;
+
+  // If set to `true`, indicates that the debuggee is considered as inactive by
+  // the Controller service.
+  bool is_inactive = 5;
+
+  // Version ID of the agent release. The version ID is structured as
+  // following: `domain/type/vmajor.minor` (for example
+  // `google.com/gcp-java/v1.1`).
+  string agent_version = 6;
+
+  // If set to `true`, indicates that the agent should disable itself and
+  // detach from the debuggee.
+  bool is_disabled = 7;
+
+  // Human readable message to be displayed to the user about this debuggee.
+  // Absence of this field indicates no status. The message can be either
+  // informational or an error status.
+  StatusMessage status = 8;
+
+  // References to the locations and revisions of the source code used in the
+  // deployed application.
+  //
+  // NOTE: This field is deprecated. Consumers should use
+  // `ext_source_contexts` if it is not empty. Debug agents should populate
+  // both this field and `ext_source_contexts`.
+  repeated google.devtools.source.v1.SourceContext source_contexts = 9;
+
+  // References to the locations and revisions of the source code used in the
+  // deployed application.
+  //
+  // Contexts describing a remote repo related to the source code
+  // have a `category` label of `remote_repo`. Source snapshot source
+  // contexts have a `category` of `snapshot`.
+  repeated google.devtools.source.v1.ExtendedSourceContext ext_source_contexts = 13;
+
+  // A set of custom debuggee properties, populated by the agent, to be
+  // displayed to the user.
+  map<string, string> labels = 11;
+}
diff --git a/google/devtools/clouddebugger/v2/debugger.proto b/google/devtools/clouddebugger/v2/debugger.proto
new file mode 100644
index 000000000..5fddc786d
--- /dev/null
+++ b/google/devtools/clouddebugger/v2/debugger.proto
@@ -0,0 +1,194 @@
+// Copyright (c) 2015, Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package google.devtools.clouddebugger.v2;
+
+import "google/api/annotations.proto";
+import "google/devtools/clouddebugger/v2/data.proto";
+import "google/protobuf/empty.proto";
+
+option java_multiple_files = true;
+option java_outer_classname = "DebuggerProto";
+option java_package = "com.google.devtools.clouddebugger.v2";
+
+
+// The Debugger service provides the API that allows users to collect run-time
+// information from a running application, without stopping or slowing it down
+// and without modifying its state.  An application may include one or
+// more replicated processes performing the same work.
+//
+// The application is represented using the Debuggee concept. The Debugger
+// service provides a way to query for available Debuggees, but does not
+// provide a way to create one.  A debuggee is created using the Controller
+// service, usually by running a debugger agent with the application.
+//
+// The Debugger service enables the client to set one or more Breakpoints on a
+// Debuggee and collect the results of the set Breakpoints.
+service Debugger2 {
+  // Sets the breakpoint to the debuggee.
+  rpc SetBreakpoint(SetBreakpointRequest) returns (SetBreakpointResponse) {
+    option (google.api.http) = { post: "/v2/debugger/debuggees/{debuggee_id}/breakpoints/set" body: "breakpoint" };
+  }
+
+  // Gets breakpoint information.
+  rpc GetBreakpoint(GetBreakpointRequest) returns (GetBreakpointResponse) {
+    option (google.api.http) = { get: "/v2/debugger/debuggees/{debuggee_id}/breakpoints/{breakpoint_id}" };
+  }
+
+  // Deletes the breakpoint from the debuggee.
+  rpc DeleteBreakpoint(DeleteBreakpointRequest) returns (google.protobuf.Empty) {
+    option (google.api.http) = { delete: "/v2/debugger/debuggees/{debuggee_id}/breakpoints/{breakpoint_id}" };
+  }
+
+  // Lists all breakpoints for the debuggee.
+  rpc ListBreakpoints(ListBreakpointsRequest) returns (ListBreakpointsResponse) {
+    option (google.api.http) = { get: "/v2/debugger/debuggees/{debuggee_id}/breakpoints" };
+  }
+
+  // Lists all the debuggees that the user can set breakpoints to.
+  rpc ListDebuggees(ListDebuggeesRequest) returns (ListDebuggeesResponse) {
+    option (google.api.http) = { get: "/v2/debugger/debuggees" };
+  }
+}
+
+// Request to set a breakpoint
+message SetBreakpointRequest {
+  // ID of the debuggee where the breakpoint is to be set.
+  string debuggee_id = 1;
+
+  // Breakpoint specification to set.
+  // The field 'location' of the breakpoint must be set.
+  Breakpoint breakpoint = 2;
+
+  // The client version making the call.
+  // Following: `domain/type/version` (e.g., `google.com/intellij/v1`).
+  string client_version = 4;
+}
+
+// Response for setting a breakpoint.
+message SetBreakpointResponse {
+  // Breakpoint resource.
+  // The field `id` is guaranteed to be set (in addition to the echoed fileds).
+  Breakpoint breakpoint = 1;
+}
+
+// Request to get breakpoint information.
+message GetBreakpointRequest {
+  // ID of the debuggee whose breakpoint to get.
+  string debuggee_id = 1;
+
+  // ID of the breakpoint to get.
+  string breakpoint_id = 2;
+
+  // The client version making the call.
+  // Following: `domain/type/version` (e.g., `google.com/intellij/v1`).
+  string client_version = 4;
+}
+
+// Response for getting breakpoint information.
+message GetBreakpointResponse {
+  // Complete breakpoint state.
+  // The fields `id` and `location` are guaranteed to be set.
+  Breakpoint breakpoint = 1;
+}
+
+// Request to delete a breakpoint.
+message DeleteBreakpointRequest {
+  // ID of the debuggee whose breakpoint to delete.
+  string debuggee_id = 1;
+
+  // ID of the breakpoint to delete.
+  string breakpoint_id = 2;
+
+  // The client version making the call.
+  // Following: `domain/type/version` (e.g., `google.com/intellij/v1`).
+  string client_version = 3;
+}
+
+// Request to list breakpoints.
+message ListBreakpointsRequest {
+  // Wrapper message for `Breakpoint.Action`. Defines a filter on the action
+  // field of breakpoints.
+  message BreakpointActionValue {
+    // Only breakpoints with the specified action will pass the filter.
+    Breakpoint.Action value = 1;
+  }
+
+  // ID of the debuggee whose breakpoints to list.
+  string debuggee_id = 1;
+
+  // When set to `true`, the response includes the list of breakpoints set by
+  // any user. Otherwise, it includes only breakpoints set by the caller.
+  bool include_all_users = 2;
+
+  // When set to `true`, the response includes active and inactive
+  // breakpoints. Otherwise, it includes only active breakpoints.
+  bool include_inactive = 3;
+
+  // When set, the response includes only breakpoints with the specified action.
+  BreakpointActionValue action = 4;
+
+  // When set to `true`, the response breakpoints are stripped of the
+  // results fields: `stack_frames`, `evaluated_expressions` and
+  // `variable_table`.
+  bool strip_results = 5;
+
+  // A wait token that, if specified, blocks the call until the breakpoints
+  // list has changed, or a server selected timeout has expired.  The value
+  // should be set from the last response. The error code
+  // `google.rpc.Code.ABORTED` (RPC) is returned on wait timeout, which
+  // should be called again with the same `wait_token`.
+  string wait_token = 6;
+
+  // The client version making the call.
+  // Following: `domain/type/version` (e.g., `google.com/intellij/v1`).
+  string client_version = 8;
+}
+
+// Response for listing breakpoints.
+message ListBreakpointsResponse {
+  // List of all breakpoints with complete state.
+  // The fields `id` and `location` are guaranteed to be set on each breakpoint.
+  repeated Breakpoint breakpoints = 1;
+
+  // A wait token that can be used in the next call to `list` (REST) or
+  // `ListBreakpoints` (RPC) to block until the list of breakpoints has changes.
+  string next_wait_token = 2;
+}
+
+// Request to list debuggees.
+message ListDebuggeesRequest {
+  // Project number of a Google Cloud project whose debuggees to list.
+  string project = 2;
+
+  // When set to `true`, the result includes all debuggees. Otherwise, the
+  // result includes only debuggees that are active.
+  bool include_inactive = 3;
+
+  // The client version making the call.
+  // Following: `domain/type/version` (e.g., `google.com/intellij/v1`).
+  string client_version = 4;
+}
+
+// Response for listing debuggees.
+message ListDebuggeesResponse {
+  // List of debuggees accessible to the calling user.
+  // Note that the `description` field is the only human readable field
+  // that should be displayed to the user.
+  // The fields `debuggee.id` and  `description` fields are guaranteed to be
+  // set on each debuggee.
+  repeated Debuggee debuggees = 1;
+}