From ffa21aba591fa5f36341c039da226bf5bf360b85 Mon Sep 17 00:00:00 2001
From: herczyn <herczyn@google.com>
Date: Fri, 5 Dec 2025 08:38:48 +0000
Subject: [PATCH 1/4] Add pause and resume to a2a.proto

---
 specification/grpc/a2a.proto | 46 ++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/specification/grpc/a2a.proto b/specification/grpc/a2a.proto
index 8234c7081..0a24a55b8 100644
--- a/specification/grpc/a2a.proto
+++ b/specification/grpc/a2a.proto
@@ -59,6 +59,28 @@ service A2AService {
       }
     };
   }
+  // Pause a task.
+  rpc PauseTask(PauseTaskRequest) returns (Task) {
+    option (google.api.http) = {
+      post: "/{name=tasks/*}:pause"
+      body: "*"
+      additional_bindings: {
+        post: "/{tenant}/{name=tasks/*}:pause"
+        body: "*"
+      }
+    };
+  }
+  // Resume a task.
+  rpc ResumeTask(ResumeTaskRequest) returns (Task) {
+    option (google.api.http) = {
+      post: "/{name=tasks/*}:resume"
+      body: "*"
+      additional_bindings: {
+        post: "/{tenant}/{name=tasks/*}:resume"
+        body: "*"
+      }
+    };
+  }
   // Cancel a task.
   rpc CancelTask(CancelTaskRequest) returns (Task) {
     option (google.api.http) = {
@@ -483,6 +505,8 @@ message AgentCapabilities {
   repeated AgentExtension extensions = 3;
   // Indicates if the agent provides a history of state transitions for a task.
   optional bool state_transition_history = 4;
+  // Indicates if the agent supports pause and resume of tasks.
+  optional bool pause_resume = 5;
 }
 // --8<-- [end:AgentCapabilities]
 
@@ -775,6 +799,28 @@ message ListTasksResponse {
 }
 // --8<-- [end:ListTasksResponse]
 
+// --8<-- [start:PauseTaskRequest]
+// Represents a request for the `tasks/cancel` method.
+message PauseTaskRequest {
+  // Optional tenant, provided as a path parameter.
+  string tenant = 2;
+  // The resource name of the task to cancel.
+  // Format: tasks/{task_id}
+  string name = 1;
+}
+// --8<-- [end:PauseTaskRequest]
+
+// --8<-- [start:ResumeTaskRequest]
+// Represents a request for the `tasks/cancel` method.
+message ResumeTaskRequest {
+  // Optional tenant, provided as a path parameter.
+  string tenant = 2;
+  // The resource name of the task to cancel.
+  // Format: tasks/{task_id}
+  string name = 1;
+}
+// --8<-- [end:ResumeTaskRequest]
+
 // --8<-- [start:CancelTaskRequest]
 // Represents a request for the `tasks/cancel` method.
 message CancelTaskRequest {

From ed7f940b7b0513da237caef74b11950e252c0a76 Mon Sep 17 00:00:00 2001
From: herczyn <herczyn@google.com>
Date: Fri, 5 Dec 2025 08:42:48 +0000
Subject: [PATCH 2/4] Add paused state.

---
 specification/grpc/a2a.proto | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/specification/grpc/a2a.proto b/specification/grpc/a2a.proto
index 0a24a55b8..2387f5096 100644
--- a/specification/grpc/a2a.proto
+++ b/specification/grpc/a2a.proto
@@ -224,6 +224,8 @@ enum TaskState {
   // client. Authentication is expected to come out-of-band thus this is not
   // an interrupted or terminal state.
   TASK_STATE_AUTH_REQUIRED = 8;
+  // Represents the status a task was paused and could be resumed.
+  TASK_STATE_PAUSED = 8;
 }
 // --8<-- [end:TaskState]
 

From c5d35cf633eb5fc87662f6dad21f32f7429622a5 Mon Sep 17 00:00:00 2001
From: herczyn <herczyn@google.com>
Date: Fri, 5 Dec 2025 13:59:27 +0000
Subject: [PATCH 3/4] Fix typos.

---
 specification/grpc/a2a.proto | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/specification/grpc/a2a.proto b/specification/grpc/a2a.proto
index 2387f5096..a7f5ba388 100644
--- a/specification/grpc/a2a.proto
+++ b/specification/grpc/a2a.proto
@@ -802,22 +802,22 @@ message ListTasksResponse {
 // --8<-- [end:ListTasksResponse]
 
 // --8<-- [start:PauseTaskRequest]
-// Represents a request for the `tasks/cancel` method.
+// Represents a request for the `tasks/pause` method.
 message PauseTaskRequest {
   // Optional tenant, provided as a path parameter.
   string tenant = 2;
-  // The resource name of the task to cancel.
+  // The resource name of the task to pause.
   // Format: tasks/{task_id}
   string name = 1;
 }
 // --8<-- [end:PauseTaskRequest]
 
 // --8<-- [start:ResumeTaskRequest]
-// Represents a request for the `tasks/cancel` method.
+// Represents a request for the `tasks/resume` method.
 message ResumeTaskRequest {
   // Optional tenant, provided as a path parameter.
   string tenant = 2;
-  // The resource name of the task to cancel.
+  // The resource name of the task to resume.
   // Format: tasks/{task_id}
   string name = 1;
 }

From 85376ac0510e6adad7450d1c510954f558f5542a Mon Sep 17 00:00:00 2001
From: herczyn <herczyn@google.com>
Date: Fri, 5 Dec 2025 15:10:38 +0100
Subject: [PATCH 4/4] FIx tag.

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
---
 specification/grpc/a2a.proto | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/specification/grpc/a2a.proto b/specification/grpc/a2a.proto
index a7f5ba388..3e7af863a 100644
--- a/specification/grpc/a2a.proto
+++ b/specification/grpc/a2a.proto
@@ -225,7 +225,7 @@ enum TaskState {
   // an interrupted or terminal state.
   TASK_STATE_AUTH_REQUIRED = 8;
   // Represents the status a task was paused and could be resumed.
-  TASK_STATE_PAUSED = 8;
+  TASK_STATE_PAUSED = 9;
 }
 // --8<-- [end:TaskState]