Python: Add A2A server sample (#4528)

* Python: Add A2A server sample and fix client streaming bug Add a pure Python A2A server sample so testing the A2A client no longer requires running the .NET server. The server uses the a2a-sdk's A2AStarletteApplication with uvicorn and supports three agent types (invoice, policy, logistics) backed by AzureOpenAIResponsesClient. New files: - a2a_server.py: Main server entry point with CLI args - agent_executor.py: Bridges a2a-sdk AgentExecutor to Agent Framework - agent_definitions.py: Agent and AgentCard factory definitions - invoice_data.py: Mock invoice data and query tool functions - a2a_server.http: REST Client requests for testing Also fixes a streaming bug in agent_with_a2a.py where async with was used on ResponseStream which does not support the async context manager protocol. Changed to async for to match all other samples. Closes #4045 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Address PR review: handle CancelledError and fix end_date filtering - Re-raise asyncio.CancelledError before the broad exception handler so cooperative cancellation is not swallowed. - Make end_date filter inclusive of the full day by comparing with < end + timedelta(days=1) instead of <= midnight. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-06-16 21:04:09 +08:00 · 2026-03-09 17:00:49 -07:00
parent e2f0bc814e
commit ded32f3ff8
7 changed files with 709 additions and 25 deletions
@@ -0,0 +1,82 @@
+### Each A2A agent is available at a different host address
+@hostInvoice = http://localhost:5000
+@hostPolicy = http://localhost:5001
+@hostLogistics = http://localhost:5002
+
+### Query agent card for the invoice agent
+GET {{hostInvoice}}/.well-known/agent.json
+
+### Send a message to the invoice agent
+POST {{hostInvoice}}
+Content-Type: application/json
+
+{
+    "id": "1",
+    "jsonrpc": "2.0",
+    "method": "message/send",
+    "params": {
+        "message": {
+            "kind": "message",
+            "role": "user",
+            "messageId": "msg_1",
+            "parts": [
+                {
+                    "kind": "text",
+                    "text": "Show me all invoices for Contoso"
+                }
+            ]
+        }
+    }
+}
+
+### Query agent card for the policy agent
+GET {{hostPolicy}}/.well-known/agent.json
+
+### Send a message to the policy agent
+POST {{hostPolicy}}
+Content-Type: application/json
+
+{
+    "id": "2",
+    "jsonrpc": "2.0",
+    "method": "message/send",
+    "params": {
+        "message": {
+            "kind": "message",
+            "role": "user",
+            "messageId": "msg_2",
+            "parts": [
+                {
+                    "kind": "text",
+                    "text": "What is the policy for short shipments?"
+                }
+            ]
+        }
+    }
+}
+
+### Query agent card for the logistics agent
+GET {{hostLogistics}}/.well-known/agent.json
+
+### Send a message to the logistics agent
+POST {{hostLogistics}}
+Content-Type: application/json
+
+{
+    "id": "3",
+    "jsonrpc": "2.0",
+    "method": "message/send",
+    "params": {
+        "message": {
+            "kind": "message",
+            "role": "user",
+            "messageId": "msg_3",
+            "parts": [
+                {
+                    "kind": "text",
+                    "text": "What is the status for SHPMT-SAP-001?"
+                }
+            ]
+        }
+    }
+}