diff --git a/proto/agynio/api/chat/v1/chat.proto b/proto/agynio/api/chat/v1/chat.proto
index 39918b6..88f5c64 100644
--- a/proto/agynio/api/chat/v1/chat.proto
+++ b/proto/agynio/api/chat/v1/chat.proto
@@ -28,7 +28,7 @@ service ChatService {
   rpc UpdateChat(UpdateChatRequest) returns (UpdateChatResponse);
 
   // List messages in a chat with pagination.
-  // Returns an unread_count derived from Threads.GetUnackedMessages.
+  // Returns an unread_count derived from Threads.GetUnackedMessageCounts.
   // Read-only — does not change acknowledgment state.
   rpc GetMessages(GetMessagesRequest) returns (GetMessagesResponse);
 
@@ -52,6 +52,19 @@ enum ChatStatus {
   CHAT_STATUS_CLOSED = 2;
 }
 
+enum ChatActivityStatus {
+  // No workload activity data available (no non-passive agent participants
+  // or the thread is degraded).
+  CHAT_ACTIVITY_STATUS_UNSPECIFIED = 0;
+  // At least one most recent workload is running.
+  CHAT_ACTIVITY_STATUS_RUNNING = 1;
+  // At least one most recent workload is starting, stopping, or failed
+  // (non-degraded), and none are running.
+  CHAT_ACTIVITY_STATUS_PENDING = 2;
+  // All most recent workloads are stopped or absent.
+  CHAT_ACTIVITY_STATUS_FINISHED = 3;
+}
+
 // A chat thread between participants.
 message Chat {
   string id = 1; // UUID — maps to Threads thread_id
@@ -61,6 +74,18 @@ message Chat {
   string organization_id = 5; // UUID — owning organization
   ChatStatus status = 6;
   optional string summary = 7;
+  // Workload activity summary for the chat. Derived from the most recent
+  // workload per (thread, agent) with aggregation RUNNING > PENDING > FINISHED.
+  // PENDING includes starting, stopping, and (non-degraded) failed workloads,
+  // so it may be set even when active_workload_ids is empty. UNSPECIFIED when
+  // workload activity is not tracked for this chat.
+  ChatActivityStatus activity_status = 8;
+  // Unacknowledged message count for the authenticated user in this chat.
+  // Derived from Threads.GetUnackedMessageCounts (missing entry => 0).
+  int32 unread_count = 9;
+  // Workload IDs in starting, running, or stopping state for this chat.
+  // Failed and stopped workloads are excluded.
+  repeated string active_workload_ids = 10;
 }
 
 // A participant in a chat.
@@ -138,7 +163,7 @@ message GetMessagesResponse {
   repeated ChatMessage messages = 1;
   string next_page_token = 2;
   // Number of unacknowledged messages for the authenticated user in this
-  // chat. Derived from Threads.GetUnackedMessages.
+  // chat. Derived from Threads.GetUnackedMessageCounts (missing entry => 0).
   int32 unread_count = 3;
 }
 
diff --git a/proto/agynio/api/gateway/v1/threads.proto b/proto/agynio/api/gateway/v1/threads.proto
index e9c6558..d1f15ff 100644
--- a/proto/agynio/api/gateway/v1/threads.proto
+++ b/proto/agynio/api/gateway/v1/threads.proto
@@ -17,5 +17,6 @@ service ThreadsGateway {
   rpc GetThread(agynio.api.threads.v1.GetThreadRequest) returns (agynio.api.threads.v1.GetThreadResponse);
   rpc GetMessages(agynio.api.threads.v1.GetMessagesRequest) returns (agynio.api.threads.v1.GetMessagesResponse);
   rpc GetUnackedMessages(agynio.api.threads.v1.GetUnackedMessagesRequest) returns (agynio.api.threads.v1.GetUnackedMessagesResponse);
+  rpc GetUnackedMessageCounts(agynio.api.threads.v1.GetUnackedMessageCountsRequest) returns (agynio.api.threads.v1.GetUnackedMessageCountsResponse);
   rpc AckMessages(agynio.api.threads.v1.AckMessagesRequest) returns (agynio.api.threads.v1.AckMessagesResponse);
 }
diff --git a/proto/agynio/api/threads/v1/threads.proto b/proto/agynio/api/threads/v1/threads.proto
index c209140..18a7bd0 100644
--- a/proto/agynio/api/threads/v1/threads.proto
+++ b/proto/agynio/api/threads/v1/threads.proto
@@ -47,6 +47,9 @@ service ThreadsService {
   // List unacknowledged messages for a participant across all threads.
   rpc GetUnackedMessages(GetUnackedMessagesRequest) returns (GetUnackedMessagesResponse);
 
+  // Get unacknowledged message counts per thread for a participant.
+  rpc GetUnackedMessageCounts(GetUnackedMessageCountsRequest) returns (GetUnackedMessageCountsResponse);
+
   // Acknowledge messages as processed by a participant.
   rpc AckMessages(AckMessagesRequest) returns (AckMessagesResponse);
 }
@@ -337,6 +340,20 @@ message GetUnackedMessagesResponse {
   string next_page_token = 2;
 }
 
+// ===========================================================================
+// GetUnackedMessageCounts
+// ===========================================================================
+
+message GetUnackedMessageCountsRequest {
+  string participant_id = 1; // UUID
+}
+
+message GetUnackedMessageCountsResponse {
+  // key = thread_id, value = unacknowledged message count.
+  // Only threads with unacknowledged messages are included (missing key => 0).
+  map<string, int32> counts_by_thread_id = 1;
+}
+
 // ===========================================================================
 // AckMessages
 // ===========================================================================