fix(backend): don't null credentials in dry-run prepare_dry_run

validate_data strips None values from input_data before JSON schema
validation. Setting credentials=None caused the field to be absent,
failing the required check. Keep original credentials in input_data
(actual platform creds injected via extra_exec_kwargs in manager.py).

This fixes OrchestratorBlock failing with "credentials is a required
property" when executed as part of a child graph in dry-run mode.

autogpt_platform/backend/backend/executor/simulator.py

@@ -324,13 +324,15 @@ def prepare_dry_run(block: Any, input_data: dict[str, Any]) -> dict[str, Any] |
         max_iters = 1 if original != 0 else 0
         sim_model = _simulator_model()
 
+        # Keep the original credentials dict in input_data so the block's
+        # JSON schema validation passes (validate_data strips None values,
+        # making the field absent and failing the "required" check).
+        # The actual credentials are injected via extra_exec_kwargs in
+        # manager.py using _dry_run_api_key.
         return {
             **input_data,
             "agent_mode_max_iterations": max_iters,
             "model": sim_model,
-            # Signal to manager.py that credentials should be skipped —
-            # the platform key is injected via _dry_run_credentials().
-            "credentials": None,
             "_dry_run_api_key": or_key,
         }
 

autogpt_platform/backend/backend/executor/simulator_test.py

@@ -158,7 +158,9 @@ class TestPrepareDryRun:
         assert result["agent_mode_max_iterations"] == 1
         assert result["other"] == "val"
         assert result["model"] != "gpt-4o"  # overridden to simulation model
-        assert result["credentials"] is None
+        # credentials left as-is so block schema validation passes —
+        # actual creds injected via extra_exec_kwargs in manager.py
+        assert "credentials" not in result
         assert result["_dry_run_api_key"] == "sk-or-test-key"
 
     def test_orchestrator_zero_stays_zero(self) -> None: