diff --git a/protobuf/flagd/evaluation/v1/schema.proto b/protobuf/flagd/evaluation/v1/schema.proto
new file mode 100644
index 0000000..365b754
--- /dev/null
+++ b/protobuf/flagd/evaluation/v1/schema.proto
@@ -0,0 +1,193 @@
+/**
+ * Flag evaluation API
+ *
+ * This proto forms the basis of a flag-evaluation API.
+ * It supports single and bulk evaluation RPCs, and flags of various types, as well as establishing a stream for getting notifications about changes in a flag definition.
+ * It supports the inclusion of a "context" with each evaluation, which may contain arbitrary attributes relevant to flag evaluation.
+ */
+syntax = "proto3";
+
+package flagd.evaluation.v1;
+
+import "google/protobuf/struct.proto";
+
+option csharp_namespace = "OpenFeature.Flagd.Grpc.Evaluation";
+option go_package = "flagd/evaluation/v1";
+option java_package = "dev.openfeature.flagd.grpc.evaluation";
+option php_namespace = "OpenFeature\\Providers\\Flagd\\Schema\\Grpc\\Evaluation";
+option ruby_package = "OpenFeature::FlagD::Provider::Grpc::Evaluation";
+
+// Request body for bulk flag evaluation, used by the ResolveAll rpc.
+message ResolveAllRequest {
+  // Object structure describing the EvaluationContext used in the flag evaluation, see https://openfeature.dev/docs/reference/concepts/evaluation-context
+  google.protobuf.Struct context = 1;
+}
+
+// Response body for bulk flag evaluation, used by the ResolveAll rpc.
+message ResolveAllResponse {
+  // Object structure describing the evaluated flags for the provided context.
+  map<string, AnyFlag> flags = 1;
+}
+
+// A variant type flag response.
+message AnyFlag {
+  // The reason for the given return value, see https://openfeature.dev/docs/specification/types#resolution-details
+  string reason = 1;
+
+  // The variant name of the returned flag value.
+  string variant = 2;
+
+  // The response value of the boolean flag evaluation, will be unset in the case of error.
+  oneof value {
+    bool bool_value = 3;
+    string string_value = 4;
+    double double_value = 5;
+    google.protobuf.Struct object_value = 6;
+  }
+}
+
+// Request body for boolean flag evaluation, used by the ResolveBoolean rpc.
+message ResolveBooleanRequest {
+  // Flag key of the requested flag.
+  string flag_key = 1;
+
+  // Object structure describing the EvaluationContext used in the flag evaluation, see https://openfeature.dev/docs/reference/concepts/evaluation-context
+  google.protobuf.Struct context = 2;
+}
+
+// Response body for boolean flag evaluation. used by the ResolveBoolean rpc.
+message ResolveBooleanResponse {
+  // The response value of the boolean flag evaluation, will be unset in the case of error.
+  bool value = 1;
+
+  // The reason for the given return value, see https://openfeature.dev/docs/specification/types#resolution-details
+  string reason = 2;
+
+  // The variant name of the returned flag value.
+  string variant = 3;
+
+  // Metadata for this evaluation
+  google.protobuf.Struct metadata = 4;
+}
+
+// Request body for string flag evaluation, used by the ResolveString rpc.
+message ResolveStringRequest {
+  // Flag key of the requested flag.
+  string flag_key = 1;
+
+  // Object structure describing the EvaluationContext used in the flag evaluation, see https://openfeature.dev/docs/reference/concepts/evaluation-context
+  google.protobuf.Struct context = 2;
+}
+
+// Response body for string flag evaluation. used by the ResolveString rpc.
+message ResolveStringResponse {
+  // The response value of the string flag evaluation, will be unset in the case of error.
+  string value = 1;
+
+  // The reason for the given return value, see https://openfeature.dev/docs/specification/types#resolution-details
+  string reason = 2;
+
+  // The variant name of the returned flag value.
+  string variant = 3;
+
+  // Metadata for this evaluation
+  google.protobuf.Struct metadata = 4;
+}
+
+// Request body for float flag evaluation, used by the ResolveFloat rpc.
+message ResolveFloatRequest {
+  // Flag key of the requested flag.
+  string flag_key = 1;
+
+  // Object structure describing the EvaluationContext used in the flag evaluation, see https://openfeature.dev/docs/reference/concepts/evaluation-context
+  google.protobuf.Struct context = 2;
+}
+
+// Response body for float flag evaluation. used by the ResolveFloat rpc.
+message ResolveFloatResponse {
+  // The response value of the float flag evaluation, will be empty in the case of error.
+  double value = 1;
+
+  // The reason for the given return value, see https://openfeature.dev/docs/specification/types#resolution-details
+  string reason = 2;
+
+  // The variant name of the returned flag value.
+  string variant = 3;
+
+  // Metadata for this evaluation
+  google.protobuf.Struct metadata = 4;
+}
+
+// Request body for int flag evaluation, used by the ResolveInt rpc.
+message ResolveIntRequest {
+  // Flag key of the requested flag.
+  string flag_key = 1;
+
+  // Object structure describing the EvaluationContext used in the flag evaluation, see https://openfeature.dev/docs/reference/concepts/evaluation-context
+  google.protobuf.Struct context = 2;
+}
+
+// Response body for int flag evaluation. used by the ResolveInt rpc.
+message ResolveIntResponse {
+  // The response value of the int flag evaluation, will be unset in the case of error.
+  int64 value = 1;
+
+  // The reason for the given return value, see https://openfeature.dev/docs/specification/types#resolution-details
+  string reason = 2;
+
+  // The variant name of the returned flag value.
+  string variant = 3;
+
+  // Metadata for this evaluation
+  google.protobuf.Struct metadata = 4;
+}
+
+// Request body for object flag evaluation, used by the ResolveObject rpc.
+message ResolveObjectRequest {
+  // Flag key of the requested flag.
+  string flag_key = 1;
+
+  // Object structure describing the EvaluationContext used in the flag evaluation, see https://openfeature.dev/docs/reference/concepts/evaluation-context
+  google.protobuf.Struct context = 2;
+}
+
+// Response body for object flag evaluation. used by the ResolveObject rpc.
+message ResolveObjectResponse {
+  // The response value of the object flag evaluation, will be unset in the case of error.
+  //
+  // NOTE: This structure will need to be decoded from google/protobuf/struct.proto before it is returned to the SDK
+  google.protobuf.Struct value = 1;
+
+  // The reason for the given return value, see https://openfeature.dev/docs/specification/types#resolution-details
+  string reason = 2;
+
+  // The variant name of the returned flag value.
+  string variant = 3;
+
+  // Metadata for this evaluation
+  google.protobuf.Struct metadata = 4;
+}
+
+// Response body for the EventStream stream response
+message EventStreamResponse {
+  // String key indicating the type of event that is being received, for example, provider_ready or configuration_change
+  string type = 1;
+
+  // Object structure for use when sending relevant metadata to provide context to the event.
+  // Can be left unset when it is not required.
+  google.protobuf.Struct data = 2;
+}
+
+// Empty stream request body
+message EventStreamRequest {}
+
+// Service defines the exposed rpcs of flagd
+service Service {
+  rpc ResolveAll(ResolveAllRequest) returns (ResolveAllResponse) {}
+  rpc ResolveBoolean(ResolveBooleanRequest) returns (ResolveBooleanResponse) {}
+  rpc ResolveString(ResolveStringRequest) returns (ResolveStringResponse) {}
+  rpc ResolveFloat(ResolveFloatRequest) returns (ResolveFloatResponse) {}
+  rpc ResolveInt(ResolveIntRequest) returns (ResolveIntResponse) {}
+  rpc ResolveObject(ResolveObjectRequest) returns (ResolveObjectResponse) {}
+  rpc EventStream(EventStreamRequest) returns (stream EventStreamResponse) {}
+}
diff --git a/protobuf/flagd/sync/v1/schema.proto b/protobuf/flagd/sync/v1/schema.proto
new file mode 100644
index 0000000..ba1a961
--- /dev/null
+++ b/protobuf/flagd/sync/v1/schema.proto
@@ -0,0 +1,93 @@
+/**
+ * Flag definition sync API
+ *
+ * This proto defines a simple API to synchronize a feature flag definition.
+ * It supports establishing a stream for getting notifications about changes in a flag definition.
+ */
+syntax = "proto3";
+
+package flagd.sync.v1;
+
+option csharp_namespace = "OpenFeature.Flagd.Grpc.Sync";
+option go_package = "flagd/sync/v1";
+option java_package = "dev.openfeature.flagd.grpc.sync";
+option php_namespace = "OpenFeature\\Providers\\Flagd\\Schema\\Grpc\\Sync";
+option ruby_package = "OpenFeature::FlagD::Provider::Grpc::Sync";
+
+// SyncFlagsRequest is the request initiating the sever-streaming rpc. Flagd sends this request, acting as the client
+message SyncFlagsRequest {
+  // Optional: A unique identifier for flagd(grpc client) initiating the request. The server implementations may
+  // utilize this identifier to uniquely identify, validate(ex:- enforce authentication/authorization) and filter
+  // flag configurations that it can expose to this request. This field is intended to be optional. However server
+  // implementations may enforce it.
+  //    ex:- provider_id: flagd-weatherapp-sidecar
+  string provider_id = 1;
+
+  // Optional: A selector for the flag configuration request. The server implementation may utilize this to select
+  // flag configurations from a collection, select the source of the flag or combine this to any desired underlying
+  // filtering mechanism.
+  //    ex:- selector: 'source=database,app=weatherapp'
+  string selector = 2;
+}
+
+// SyncState conveys the state of the payload. These states are related to flagd isync.go type definitions but
+// contains extras to optimize grpc use case. Refer - https://github.com/open-feature/flagd/blob/main/pkg/sync/isync.go
+enum SyncState {
+  // Value is ignored by the listening flagd
+  SYNC_STATE_UNSPECIFIED = 0;
+
+  // All the flags matching the request. This is the default response and other states can be ignored
+  // by the implementation. Flagd internally replaces all existing flags for this response state.
+  SYNC_STATE_ALL = 1;
+
+  // Convey an addition of a flag. Flagd internally handles this by combining new flags with existing ones
+  SYNC_STATE_ADD = 2;
+
+  // Convey an update of a flag. Flagd internally attempts to update if the updated flag already exist OR if it does not,
+  // it will get added
+  SYNC_STATE_UPDATE = 3;
+
+  // Convey a deletion of a flag. Flagd internally removes the flag
+  SYNC_STATE_DELETE = 4;
+
+  // Optional server ping to check client connectivity. Handling is ignored by flagd and is to merely support live check
+  SYNC_STATE_PING = 5;
+}
+
+// SyncFlagsResponse is the server response containing feature flag configurations and the state
+message SyncFlagsResponse {
+  // flagd feature flag configuration. Must be validated to schema - https://raw.githubusercontent.com/open-feature/schemas/main/json/flagd-definitions.json
+  string flag_configuration = 1;
+
+  // State conveying the operation to be performed by flagd. See the descriptions of SyncState for an explanation of
+  // supported values
+  SyncState state = 2;
+}
+
+// FetchAllFlagsRequest is the request to fetch all flags. Flagd sends this request as the client in order to resync its internal state
+message FetchAllFlagsRequest {
+  // Optional: A unique identifier for flagd(grpc client) initiating the request. The server implementations may
+  // utilize this identifier to uniquely identify, validate(ex:- enforce authentication/authorization) and filter
+  // flag configurations that it can expose to this request. This field is intended to be optional. However server
+  // implementations may enforce it.
+  //    ex:- provider_id: flagd-weatherapp-sidecar
+  string provider_id = 1;
+
+  // Optional: A selector for the flag configuration request. The server implementation may utilize this to select
+  // flag configurations from a collection, select the source of the flag or combine this to any desired underlying
+  // filtering mechanism.
+  //    ex:- selector: 'source=database,app=weatherapp'
+  string selector = 2;
+}
+
+//  FetchAllFlagsResponse is the server response containing feature flag configurations
+message FetchAllFlagsResponse {
+  // flagd feature flag configuration. Must be validated to schema - https://raw.githubusercontent.com/open-feature/schemas/main/json/flagd-definitions.json
+  string flag_configuration = 1;
+}
+
+// FlagService implements a server streaming to provide realtime flag configurations
+service FlagSyncService {
+  rpc SyncFlags(SyncFlagsRequest) returns (stream SyncFlagsResponse) {}
+  rpc FetchAllFlags(FetchAllFlagsRequest) returns (FetchAllFlagsResponse) {}
+}