diff --git a/decision_mapper.py b/decision_mapper.py
index 5d2127f..2b71e71 100644
--- a/decision_mapper.py
+++ b/decision_mapper.py
@@ -6,6 +6,7 @@
 
 from quant_platform_kit.strategy_contracts import (
     PositionTarget,
+    StrategyContractValidationError,
     StrategyDecision,
     ValueTargetExecutionAnnotations,
     build_value_target_execution_annotations,
@@ -244,7 +245,23 @@ def _normalize_to_value_decision(
 
 
 def _build_annotations(decision: StrategyDecision, *, portfolio_inputs) -> ValueTargetExecutionAnnotations:
-    annotations = build_value_target_execution_annotations(decision)
+    try:
+        annotations = build_value_target_execution_annotations(decision)
+    except StrategyContractValidationError as exc:
+        if "requires trade_threshold_value" not in str(exc):
+            raise
+        diagnostics = dict(decision.diagnostics)
+        raw_annotations = diagnostics.get("execution_annotations")
+        execution_annotations = (
+            dict(raw_annotations) if isinstance(raw_annotations, Mapping) else {}
+        )
+        execution_annotations["trade_threshold_value"] = _default_threshold_value(
+            float(portfolio_inputs.total_equity)
+        )
+        diagnostics["execution_annotations"] = execution_annotations
+        annotations = build_value_target_execution_annotations(
+            replace(decision, diagnostics=diagnostics)
+        )
     investable_cash = annotations.investable_cash
     if investable_cash is None:
         investable_cash = max(0.0, float(portfolio_inputs.liquid_cash) - annotations.reserved_cash)
diff --git a/tests/test_decision_mapper.py b/tests/test_decision_mapper.py
index 6e61521..75ad1c4 100644
--- a/tests/test_decision_mapper.py
+++ b/tests/test_decision_mapper.py
@@ -70,3 +70,50 @@ def test_platform_reserved_cash_policy_does_not_lower_strategy_reserve():
 
     assert plan["execution"]["reserved_cash"] == 1200.0
     assert plan["execution"]["investable_cash"] == 1800.0
+
+
+def test_value_decision_without_threshold_uses_platform_default():
+    decision = StrategyDecision(
+        positions=(PositionTarget(symbol="AAA", target_value=500.0),),
+        diagnostics={"signal_display": "hold AAA"},
+    )
+    snapshot = PortfolioSnapshot(
+        as_of=datetime.now(timezone.utc),
+        total_equity=20000.0,
+        buying_power=3000.0,
+        positions=(),
+    )
+
+    plan = map_strategy_decision_to_plan(
+        decision,
+        snapshot=snapshot,
+        strategy_profile="mega_cap_leader_rotation_top50_balanced",
+    )
+
+    assert plan["execution"]["trade_threshold_value"] == 200.0
+    assert plan["execution"]["current_min_trade"] == 200.0
+    assert plan["allocation"]["targets"]["AAA"] == 500.0
+
+
+def test_no_execute_decision_without_threshold_holds_current_positions():
+    decision = StrategyDecision(
+        positions=(),
+        risk_flags=("no_execute",),
+        diagnostics={"signal_description": "no actionable signal"},
+    )
+    snapshot = PortfolioSnapshot(
+        as_of=datetime.now(timezone.utc),
+        total_equity=5000.0,
+        buying_power=1000.0,
+        positions=(Position(symbol="AAA", quantity=3, market_value=750.0),),
+    )
+
+    plan = map_strategy_decision_to_plan(
+        decision,
+        snapshot=snapshot,
+        strategy_profile="mega_cap_leader_rotation_top50_balanced",
+    )
+
+    assert plan["execution"]["trade_threshold_value"] == 100.0
+    assert plan["execution"]["current_min_trade"] == 100.0
+    assert plan["allocation"]["targets"]["AAA"] == 750.0