diff --git a/plugins/marginal/runtime/marginal_runtime.pyz b/plugins/marginal/runtime/marginal_runtime.pyz
index c8c17fc..1433d81 100644
Binary files a/plugins/marginal/runtime/marginal_runtime.pyz and b/plugins/marginal/runtime/marginal_runtime.pyz differ
diff --git a/plugins/marginal/runtime/provenance.json b/plugins/marginal/runtime/provenance.json
index 3e53404..312d4ed 100644
--- a/plugins/marginal/runtime/provenance.json
+++ b/plugins/marginal/runtime/provenance.json
@@ -1 +1 @@
-{"builder":"scripts/build_codex_plugin.py","python_requires":">=3.10","schema_version":1,"sha256":"b39f7844b1284e2d7dde4223e1fd5f54d194afc39d8ff85c2b7c1c3f2ac8c0b2","source_hash":"033cdfa97274975b3814519313f82c3aee356dcd510ad3cf717b9fe4063ade22"}
+{"builder":"scripts/build_codex_plugin.py","python_requires":">=3.10","schema_version":1,"sha256":"8522010f98080fa7b5e476e055941107893436ee79d58d36a16512189792722d","source_hash":"3d9a6c5e865f3f23f430344ab440359c3c32eeaa166319f9d9d327c11bfa4f7f"}
diff --git a/src/marginal/integrations/hookkit/session.py b/src/marginal/integrations/hookkit/session.py
index fa10189..2e7ae2c 100644
--- a/src/marginal/integrations/hookkit/session.py
+++ b/src/marginal/integrations/hookkit/session.py
@@ -102,7 +102,7 @@ def tool_call_end(self, end: ToolCallEnd) -> ActionOutcomeStatus:
 
         self._ensure_open()
         self._validate_session(end.session_id)
-        action = self._pending.pop(end.call_id, None)
+        action = self._pending.get(end.call_id)
         if action is None:
             # A completion without a recorded proposal means hook coverage was
             # incomplete for this call. Report it instead of settling an action
@@ -113,6 +113,14 @@ def tool_call_end(self, end: ToolCallEnd) -> ActionOutcomeStatus:
             raise HookIntegrationError(
                 f"completion tool identity does not match the proposal: {end.call_id}"
             )
+        if str(action.metadata.get("turn_id", "")) != end.turn_id:
+            raise HookIntegrationError(
+                f"completion turn identity does not match the proposal: {end.call_id}"
+            )
+        # Consume the proposal only after every stable identity dimension
+        # matches. Engines may enrich tool_input on completion, so call, tool,
+        # turn, and session identities are the compatible correlation boundary.
+        self._pending.pop(end.call_id)
 
         actual_cost = self._actual_cost(end)
         if end.outcome is ActionOutcomeStatus.SUCCESS:
diff --git a/tests/integrations/hookkit/test_session.py b/tests/integrations/hookkit/test_session.py
index a1c3a24..691b5f4 100644
--- a/tests/integrations/hookkit/test_session.py
+++ b/tests/integrations/hookkit/test_session.py
@@ -26,12 +26,15 @@ def _session(workspace: Path) -> HookSessionRuntime:
     return HookSessionRuntime(_runtime(), workspace=workspace)
 
 
-def _start(call_id: str, tool: str = "Read", **arguments: object) -> ToolCallStart:
+def _start(
+    call_id: str, tool: str = "Read", *, turn_id: str = "", **arguments: object
+) -> ToolCallStart:
     return ToolCallStart(
         session_id=SESSION,
         call_id=call_id,
         tool_name=tool,
         tool_input=arguments or {"file_path": "/workspace/example.txt"},
+        turn_id=turn_id,
     )
 
 
@@ -42,14 +45,18 @@ def _end(
     outcome: ActionOutcomeStatus = ActionOutcomeStatus.SUCCESS,
     evidence: object = None,
     duration_ms: float | None = None,
+    turn_id: str = "",
+    **arguments: object,
 ) -> ToolCallEnd:
     return ToolCallEnd(
         session_id=SESSION,
         call_id=call_id,
         tool_name=tool,
         outcome=outcome,
+        tool_input=arguments or {"file_path": "/workspace/example.txt"},
         evidence=evidence if evidence is not None else {"content": "hello"},
         duration_ms=duration_ms,
+        turn_id=turn_id,
     )
 
 
@@ -113,6 +120,27 @@ def test_a_completion_for_a_different_tool_is_rejected(tmp_path: Path) -> None:
     session.tool_call_start(_start("call-1", tool="Read"))
     with pytest.raises(HookIntegrationError):
         session.tool_call_end(_end("call-1", tool="Bash"))
+    assert session.pending_action_ids() == ("call-1",)
+
+
+def test_a_cross_wired_completion_cannot_consume_another_action(tmp_path: Path) -> None:
+    session = _session(tmp_path)
+    session.tool_call_start(_start("call-1", turn_id="turn-a", file_path="a.txt"))
+    session.tool_call_start(_start("call-2", turn_id="turn-b", file_path="b.txt"))
+
+    with pytest.raises(HookIntegrationError, match="turn identity"):
+        session.tool_call_end(_end("call-1", turn_id="turn-b", file_path="a.txt"))
+
+    assert session.pending_action_ids() == ("call-1", "call-2")
+    assert (
+        session.tool_call_end(_end("call-2", turn_id="turn-b", file_path="b.txt"))
+        is ActionOutcomeStatus.SUCCESS
+    )
+    assert (
+        session.tool_call_end(_end("call-1", turn_id="turn-a", file_path="a.txt"))
+        is ActionOutcomeStatus.SUCCESS
+    )
+    assert session.summary()["successful_observations"] == 2
 
 
 def test_a_completion_without_a_proposal_is_reported_not_settled(tmp_path: Path) -> None: