fix(backend): tighten ValueError message and test assertion in _generate_schema

- Add stable prefix to ValueError: "Invalid graph schema input: {e}"
  to aid debugging and triage
- Add match="name" to pytest.raises to guard the specific missing-name
  failure path, not just any ValueError

autogpt_platform/backend/backend/data/graph.py

@@ -333,26 +333,29 @@ class BaseGraph(GraphBaseMeta):
             except Exception as e:
                 logger.error(f"Invalid {type_class}: {input_default}, {e}")
 
-        return {
-            "type": "object",
-            "properties": {
-                p.name: {
-                    **{
-                        k: v
-                        for k, v in p.generate_schema().items()
-                        if k not in ["description", "default"]
-                    },
-                    "secret": p.secret,
-                    # Default value has to be set for advanced fields.
-                    "advanced": p.advanced and p.value is not None,
-                    "title": p.title or p.name,
-                    **({"description": p.description} if p.description else {}),
-                    **({"default": p.value} if p.value is not None else {}),
-                }
-                for p in schema_fields
-            },
-            "required": [p.name for p in schema_fields if p.value is None],
-        }
+        try:
+            return {
+                "type": "object",
+                "properties": {
+                    p.name: {
+                        **{
+                            k: v
+                            for k, v in p.generate_schema().items()
+                            if k not in ["description", "default"]
+                        },
+                        "secret": p.secret,
+                        # Default value has to be set for advanced fields.
+                        "advanced": p.advanced and p.value is not None,
+                        "title": p.title or p.name,
+                        **({"description": p.description} if p.description else {}),
+                        **({"default": p.value} if p.value is not None else {}),
+                    }
+                    for p in schema_fields
+                },
+                "required": [p.name for p in schema_fields if p.value is None],
+            }
+        except AttributeError as e:
+            raise ValueError(f"Invalid graph schema input: {e}") from e
 
 
 class GraphTriggerInfo(BaseModel):

autogpt_platform/backend/backend/data/graph_test.py

@@ -15,6 +15,7 @@ from backend.blocks.basic import StoreValueBlock
 from backend.blocks.io import AgentInputBlock, AgentOutputBlock
 from backend.data.graph import (
     Graph,
+    GraphModel,
     Link,
     Node,
     get_graph,
@@ -1460,3 +1461,21 @@ async def test_validate_graph_execution_permissions_library_wrong_version_denied
     mock_is_published.assert_awaited_once_with(graph_id, graph_version)
     lib_where = mock_lib_prisma.return_value.find_first.call_args.kwargs["where"]
     assert lib_where["agentGraphVersion"] == graph_version
+
+
+# ============================================================================
+# Tests for _generate_schema AttributeError → ValueError conversion
+# ============================================================================
+
+
+def test_generate_schema_raises_value_error_when_name_missing():
+    """AgentInputBlock.Input constructed without 'name' should raise ValueError.
+
+    model_construct() skips validation, so the Input object is created without
+    a 'name' attribute.  The dict comprehension in _generate_schema then hits an
+    AttributeError when it accesses p.name.  That AttributeError must be caught
+    and re-raised as ValueError so the existing 400 handler in rest_api.py fires
+    instead of falling through to the 500 catch-all.
+    """
+    with pytest.raises(ValueError, match="name"):
+        GraphModel._generate_schema((AgentInputBlock.Input, {}))