diff --git a/tests/test_end_to_end.py b/tests/test_end_to_end.py
new file mode 100644
index 0000000..241cbb9
--- /dev/null
+++ b/tests/test_end_to_end.py
@@ -0,0 +1,43 @@
+import os
+import sys
+BASE = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
+if BASE not in sys.path:
+    sys.path.insert(0, BASE)
+
+from crossvenue_arbx.adapters import PriceFeedAdapter, BrokerAdapter
+from crossvenue_arbx.coordinator import CentralCoordinator
+from crossvenue_arbx.core import LocalArbProblem, SharedSignals
+
+
+def test_end_to_end_two_venues_basic_reconciliation():
+    # Simple two-venue setup with two assets to validate end-to-end flow
+    adA = PriceFeedAdapter("VenueA", ["AAPL", "MSFT"])
+    adB = PriceFeedAdapter("VenueB", ["AAPL", "MSFT"])
+    coord = CentralCoordinator()
+
+    # Scene 1: VenueA emits a delta with an ensured large delta to produce a plan
+    pA, sA = adA.step()
+    # Force a sizable delta to trigger a plan (robust test across hash nondeterminism)
+    sA.price_delta_by_asset["AAPL"] = 0.01
+    planA = coord.ingest_local(pA, sA)
+    assert planA is not None
+    assert isinstance(planA.delta_actions, list)
+    assert len(planA.delta_actions) >= 0
+
+    # Scene 2: VenueB emits a delta large enough to produce a plan
+    pB, sB = adB.step()
+    sB.price_delta_by_asset["AAPL"] = 0.012
+    planB = coord.ingest_local(pB, sB)
+    # Either VenueA or VenueB may yield a plan depending on deltas; at least one plan may exist
+    assert planB is None or isinstance(planB, type(planA))
+
+    # Scene 3: reconcile across gathered deltas (offline islanding with deterministic replay)
+    recon = coord.reconcile()
+    if planA is not None or planB is not None:
+        # Should produce a PlanDelta if there were pending deltas
+        assert recon is None or isinstance(recon, type(planA))
+        if recon is not None:
+            # Ensure the merged actions are sorted in a stable way
+            actions = recon.delta_actions
+            sorted_actions = sorted(actions, key=lambda x: (x.get("from_venue"), x.get("to_venue"), x.get("asset")))
+            assert actions == sorted_actions