diff --git a/app/ai/agent_loop.py b/app/ai/agent_loop.py
index e3854c7..f376e94 100644
--- a/app/ai/agent_loop.py
+++ b/app/ai/agent_loop.py
@@ -394,27 +394,21 @@ async def run_react_loop(
                     if agent_run_id:
                         try:
                             from app.plugins.builtins.contracts import get_contract_registry
-                            from app.plugins.builtins.kommunikation.models import CommConversation
-                            from sqlalchemy import select as sa_select
                             komm = get_contract_registry().get("kommunikation")
                             if komm:
                                 agent_id = getattr(agent_definition, "id", uuid.uuid4())
                                 room_title = f"Agent: {getattr(agent_definition, 'name', 'Agent')}"
-                                existing = await db.execute(
-                                    sa_select(CommConversation).where(
-                                        CommConversation.tenant_id == tenant_id,
-                                        CommConversation.title == room_title,
-                                        CommConversation.is_locked.is_(True),
-                                        CommConversation.locked_by == "automation",
-                                        CommConversation.deleted_at.is_(None),
-                                    )
+                                conv_id = await komm.find_locked_room_id(
+                                    db=db,
+                                    tenant_id=tenant_id,
+                                    plugin_name="automation",
+                                    title=room_title,
                                 )
-                                conv = existing.scalar_one_or_none()
-                                if conv:
+                                if conv_id:
                                     await komm.send_message(
                                         db=db,
                                         tenant_id=tenant_id,
-                                        conversation_id=conv.id,
+                                        conversation_id=conv_id,
                                         sender_id=agent_id,
                                         sender_type="agent",
                                         content=f"Approval required for tool '{tool_name}'",
diff --git a/app/plugins/builtins/kommunikation/contracts.py b/app/plugins/builtins/kommunikation/contracts.py
index 1d9e2ec..b94cd08 100644
--- a/app/plugins/builtins/kommunikation/contracts.py
+++ b/app/plugins/builtins/kommunikation/contracts.py
@@ -31,6 +31,7 @@ from app.plugins.builtins.kommunikation.participant_registry import (
 )
 from app.plugins.builtins.kommunikation.services import (
     create_plugin_room,
+    find_locked_room_id,
     get_conversation,
     get_messages,
     parse_mentions,
@@ -55,6 +56,7 @@ class KommunikationContract:
     get_messages = staticmethod(get_messages)
     send_message = staticmethod(send_message)
     create_plugin_room = staticmethod(create_plugin_room)
+    find_locked_room_id = staticmethod(find_locked_room_id)
 
     # ─── participant registry ───
     get_participant_registry = staticmethod(get_participant_registry)
@@ -92,6 +94,7 @@ __all__ = [
     "get_messages",
     "send_message",
     "create_plugin_room",
+    "find_locked_room_id",
     "CommConversation",
     "CommMessage",
     "CommParticipant",
diff --git a/app/plugins/builtins/kommunikation/services.py b/app/plugins/builtins/kommunikation/services.py
index c32fe0c..ffe0b93 100644
--- a/app/plugins/builtins/kommunikation/services.py
+++ b/app/plugins/builtins/kommunikation/services.py
@@ -1047,6 +1047,30 @@ async def _get_unread_count(
 # ─── Plugin Room Creation ───
 
 
+async def find_locked_room_id(
+    db: AsyncSession,
+    tenant_id: uuid.UUID,
+    plugin_name: str,
+    title: str,
+) -> uuid.UUID | None:
+    """Find the conversation ID of a locked plugin room by tenant and title.
+
+    Matches the same room semantics as ``create_plugin_room``: locked rooms
+    are owned by the plugin (``locked_by == plugin_name``) and soft-deleted
+    conversations are excluded. Returns ``None`` when no room exists.
+    """
+    result = await db.execute(
+        select(CommConversation.id).where(
+            CommConversation.tenant_id == tenant_id,
+            CommConversation.title == title,
+            CommConversation.is_locked.is_(True),
+            CommConversation.locked_by == plugin_name,
+            CommConversation.deleted_at.is_(None),
+        )
+    )
+    return result.scalar_one_or_none()
+
+
 async def create_plugin_room(
     db: AsyncSession,
     tenant_id: uuid.UUID,
diff --git a/app/workflows/engine.py b/app/workflows/engine.py
index 29b5175..e9e088b 100644
--- a/app/workflows/engine.py
+++ b/app/workflows/engine.py
@@ -92,22 +92,16 @@ class WorkflowEngine:
             # Post workflow completion to Communication (G-WORK)
             try:
                 from app.plugins.builtins.contracts import get_contract_registry
-                from app.plugins.builtins.kommunikation.models import CommConversation
-                from sqlalchemy import select as sa_select
                 komm = get_contract_registry().get("kommunikation")
                 if komm and instance.initiated_by:
                     room_title = f"Workflow: {workflow.name if hasattr(workflow, 'name') else str(instance.workflow_id)}"
-                    existing = await self.db.execute(
-                        sa_select(CommConversation).where(
-                            CommConversation.tenant_id == self.tenant_id,
-                            CommConversation.title == room_title,
-                            CommConversation.is_locked.is_(True),
-                            CommConversation.locked_by == "workflow",
-                            CommConversation.deleted_at.is_(None),
-                        )
+                    conv_id = await komm.find_locked_room_id(
+                        db=self.db,
+                        tenant_id=self.tenant_id,
+                        plugin_name="workflow",
+                        title=room_title,
                     )
-                    conv = existing.scalar_one_or_none()
-                    if not conv:
+                    if not conv_id:
                         room = await komm.create_plugin_room(
                             db=self.db,
                             tenant_id=self.tenant_id,
@@ -117,8 +111,6 @@ class WorkflowEngine:
                             participant_type="workflow",
                         )
                         conv_id = uuid.UUID(room["conversation_id"])
-                    else:
-                        conv_id = conv.id
                     await komm.send_message(
                         db=self.db,
                         tenant_id=self.tenant_id,