WIP for TCK

Author: kabir

extras/task-store-database-jpa/src/main/java/io/a2a/extras/taskstore/database/jpa/JpaDatabaseTaskStore.java

@@ -345,9 +345,13 @@ public ListTasksResult list(ListTasksParams params) {
     }
 
     private Task transformTask(Task task, int historyLength, boolean includeArtifacts) {
-        // Limit history if needed (keep most recent N messages)
+        // Limit history based on historyLength parameter
         List<Message> history = task.getHistory();
-        if (historyLength > 0 && history != null && history.size() > historyLength) {
+        if (historyLength == 0) {
+            // historyLength=0 means no history should be included
+            history = List.of();
+        } else if (historyLength > 0 && history != null && history.size() > historyLength) {
+            // Keep most recent N messages
             history = history.subList(history.size() - historyLength, history.size());
         }
 

server-common/src/main/java/io/a2a/server/tasks/InMemoryTaskStore.java

@@ -133,9 +133,13 @@ public ListTasksResult list(ListTasksParams params) {
     }
 
     private Task transformTask(Task task, int historyLength, boolean includeArtifacts) {
-        // Limit history if needed (keep most recent N messages)
+        // Limit history based on historyLength parameter
         List<Message> history = task.getHistory();
-        if (historyLength > 0 && history != null && history.size() > historyLength) {
+        if (historyLength == 0) {
+            // historyLength=0 means no history should be included
+            history = List.of();
+        } else if (historyLength > 0 && history != null && history.size() > historyLength) {
+            // Keep most recent N messages
             history = history.subList(history.size() - historyLength, history.size());
         }
 

spec-grpc/PROTO_DIVERGENCE.md

@@ -0,0 +1,24 @@
+# Protobuf Schema Divergence from Upstream
+
+This document tracks intentional divergences from the upstream A2A protobuf schema at https://github.com/a2aproject/A2A/blob/main/specification/grpc/a2a.proto
+
+## Current Divergences
+
+### ListTasksResponse.page_size (Field #3)
+
+**Status**: ✅ Aligned with PR #1160 (v1.0 RC)
+**Upstream PR**: https://github.com/a2aproject/A2A/pull/1160
+**Reason**: TCK tests require `pageSize` field in responses per A2A v0.4.0 spec. PR #1160 adds this field to the schema.
+**Action Required**: Remove this divergence once PR #1160 is merged and we sync to v1.0 RC.
+**Impact**: Field number change - `total_size` moved from #3 to #4 to accommodate `page_size` at #3.
+
+**Modified**: 2025-11-12
+**Tracking Issue**: https://github.com/a2aproject/A2A/pull/1160
+
+## Sync Instructions
+
+When PR #1160 is merged:
+1. Verify field numbers match our implementation
+2. Remove this divergence note
+3. Sync to upstream v1.0 RC tag
+4. Regenerate protobuf classes: `cd spec-grpc && mvn clean install -Pproto-compile`