fix(agentgateway): handle empty MCP tool list (#299)

Author: ricardosrib

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "sap-cloud-sdk"
-version = "0.48.2"
+version = "0.48.3"
 description = "SAP Cloud SDK for Python"
 readme = "README.md"
 license = "Apache-2.0"

src/sap_cloud_sdk/agentgateway/_customer.py

@@ -668,6 +668,7 @@ async def _list_server_tools(
                     )
 
                 result = await session.list_tools()
+                tools = result.tools or []
 
                 return [
                     MCPTool(
@@ -677,7 +678,7 @@ async def _list_server_tools(
                         input_schema=mcp_input_schema(t),
                         url=url,
                     )
-                    for t in result.tools
+                    for t in tools
                 ]
 
 

src/sap_cloud_sdk/agentgateway/_lob.py

@@ -30,19 +30,19 @@
     FragmentLabel,
     get_ias_fragment_name,
     get_ias_user_fragment_name,
-    list_mcp_fragments,
     list_a2a_fragments,
+    list_mcp_fragments,
 )
 from sap_cloud_sdk.agentgateway._compat import (
     mcp_input_schema,
     mcp_is_error,
     mcp_server_name,
 )
 from sap_cloud_sdk.agentgateway._models import (
-    JsonRpcError,
     Agent,
     AgentCard,
     AgentCardFilter,
+    JsonRpcError,
     MCPTool,
     MCPToolFilter,
 )
@@ -386,6 +386,11 @@ async def list_server_tools(
                 init_result = await session.initialize()
                 server_name = mcp_server_name(init_result) or fragment_name
                 result = await session.list_tools()
+                tools = result.tools or []
+                if not tools:
+                    logger.info(
+                        "No tools returned by AGW for fragment '%s'", fragment_name
+                    )
                 return [
                     MCPTool(
                         name=t.name,
@@ -395,7 +400,7 @@ async def list_server_tools(
                         url=dest_url,
                         fragment_name=fragment_name,
                     )
-                    for t in result.tools
+                    for t in tools
                 ]