fix(ibkr): probe write access with safe-haven what-if symbol

main.py

@@ -576,14 +576,19 @@ def submit_market_order_intent(ib, order_intent, **kwargs):
 
 
 def probe_market_order_write_access(ib):
-    managed_symbols = resolve_reporting_managed_symbols()
-    if len(ACCOUNT_IDS) != 1 or not managed_symbols:
+    """Probe order-write access with a low-notional safe-haven what-if buy.
+
+    Do not use the first managed growth symbol (e.g. SOXL): one share can exceed
+    small-account initial margin and emit Error 201 even though write access is OK.
+    """
+    if len(ACCOUNT_IDS) != 1:
         raise RuntimeError(
-            "IBKR what-if permission probe requires one account_id and one managed symbol"
+            "IBKR what-if permission probe requires exactly one account_id"
         )
+    probe_symbol = str(SAFE_HAVEN or "BIL").strip().upper() or "BIL"
     return probe_order_write_access(
         ib,
-        symbol=managed_symbols[0],
+        symbol=probe_symbol,
         account_id=ACCOUNT_IDS[0],
         stock_exchange=MARKET_EXCHANGE,
         stock_currency=MARKET_CURRENCY,

tests/test_request_handling.py

@@ -409,6 +409,30 @@ def fake_build_broker_adapters(*, dry_run_only_override=None):
     assert observed["dry_run_only_override"] is True
 
 
+def test_probe_market_order_write_access_uses_safe_haven_not_growth_symbol(
+    strategy_module, monkeypatch
+):
+    observed = {}
+
+    def fake_probe(_ib, *, symbol, account_id, **_kwargs):
+        observed["symbol"] = symbol
+        observed["account_id"] = account_id
+        return types.SimpleNamespace(warningText="")
+
+    monkeypatch.setattr(strategy_module, "probe_order_write_access", fake_probe)
+    monkeypatch.setattr(strategy_module, "SAFE_HAVEN", "BIL")
+    monkeypatch.setattr(strategy_module, "ACCOUNT_IDS", ["U1234567"])
+    monkeypatch.setattr(
+        strategy_module,
+        "resolve_reporting_managed_symbols",
+        lambda: ("SOXL", "SOXX", "BIL"),
+    )
+
+    strategy_module.probe_market_order_write_access(object())
+
+    assert observed == {"symbol": "BIL", "account_id": "U1234567"}
+
+
 def test_handle_dry_run_ignores_paper_liquidate_only(strategy_module, monkeypatch):
     observed = {"called": False}