diff --git a/src/langbot/pkg/api/application/api.py b/src/langbot/pkg/api/application/api.py
index a46116fce..8f6e42364 100644
--- a/src/langbot/pkg/api/application/api.py
+++ b/src/langbot/pkg/api/application/api.py
@@ -265,12 +265,14 @@ class ApplicationAPI:
                 resource_id = next(iter(identity.values()))
             detail = {'operation': spec.operation_id, 'version': spec.version}
             actor_name = None
+            dedupe_actor = None
             if context.principal.principal_type == PrincipalType.PROCESSOR:
                 actor_name = (
                     f'{context.principal.processor_kind}:{context.principal.processor_uuid}'
                     if context.principal.processor_kind
                     else context.principal.processor_uuid
                 )
+                dedupe_actor = f'processor:{context.principal.processor_uuid}:{context.principal.run_id}'
                 detail.update(
                     {
                         'processor_kind': context.principal.processor_kind,
@@ -297,6 +299,7 @@ class ApplicationAPI:
                 status_code=status,
                 detail=detail,
                 duration_ms=int((time.monotonic() - observed_at) * 1000),
+                dedupe_actor=dedupe_actor,
             )
         except Exception:
             # Audit failures must preserve the original operation result or error.
diff --git a/src/langbot/pkg/api/application/processor_context.py b/src/langbot/pkg/api/application/processor_context.py
index bb29312c2..52d73c94b 100644
--- a/src/langbot/pkg/api/application/processor_context.py
+++ b/src/langbot/pkg/api/application/processor_context.py
@@ -8,6 +8,8 @@ from collections.abc import Iterable
 
 from ..context import PrincipalContext, PrincipalType, RequestContext, WorkspaceContext
 
+_VALID_PROCESSOR_KINDS: typing.Final = frozenset({'agent', 'pipeline', 'event_processor'})
+
 
 async def build_processor_request_context(
     ap: typing.Any,
@@ -20,22 +22,20 @@ async def build_processor_request_context(
     trigger_actor: str | None = None,
 ) -> RequestContext:
     """Build a trusted RequestContext for internal processor invocations."""
-    workspace_service = getattr(ap, 'workspace_service', None)
-    if workspace_service is None and hasattr(ap, 'ap'):
-        workspace_service = getattr(ap.ap, 'workspace_service', None)
-    if workspace_service is None:
-        raise RuntimeError('Workspace service is required to resolve execution binding')
+    if not isinstance(workspace_uuid, str) or not workspace_uuid.strip():
+        raise ValueError('workspace_uuid is required')
+    if processor_kind not in _VALID_PROCESSOR_KINDS:
+        raise ValueError(f'Invalid processor_kind {processor_kind!r}; must be one of {sorted(_VALID_PROCESSOR_KINDS)}')
+    if not isinstance(processor_uuid, str) or not processor_uuid.strip():
+        raise ValueError('processor_uuid is required')
+    if not isinstance(run_id, str) or not run_id.strip():
+        raise ValueError('run_id is required')
 
-    binding = await workspace_service.get_execution_binding(workspace_uuid)
-
-    app_api = getattr(ap, 'application_api', None)
-    if app_api is None and hasattr(ap, '_operations'):
-        app_api = ap
-    if app_api is None and hasattr(ap, 'ap'):
-        app_api = getattr(ap.ap, 'application_api', None)
+    binding = await ap.workspace_service.get_execution_binding(workspace_uuid)
 
     allowed_ids = frozenset(operation_ids)
     permissions: set[str] = set()
+    app_api = getattr(ap, 'application_api', None)
     if app_api is not None:
         operations = getattr(app_api, '_operations', {})
         for op_id in allowed_ids:
diff --git a/src/langbot/pkg/operation_trace/service.py b/src/langbot/pkg/operation_trace/service.py
index 98e335e67..dbd281e8f 100644
--- a/src/langbot/pkg/operation_trace/service.py
+++ b/src/langbot/pkg/operation_trace/service.py
@@ -1127,6 +1127,7 @@ def dedupe_material(
     action: str,
     route: str | None,
     resource_id: str | None,
+    dedupe_actor: str | None = None,
 ) -> str:
     """Return the raw material the dedupe key hashes.
 
@@ -1134,9 +1135,10 @@ def dedupe_material(
     so enabling tracing never runs a hash on the request path.
     """
 
+    actor_key = dedupe_actor if dedupe_actor is not None else str(actor_account_uuid or '')
     return '|'.join(
         [
-            str(actor_account_uuid or ''),
+            actor_key,
             str(action or ''),
             str(route or ''),
             str(resource_id or ''),
@@ -1156,6 +1158,7 @@ def compute_dedupe_key(
     action: str,
     route: str | None,
     resource_id: str | None,
+    dedupe_actor: str | None = None,
 ) -> str:
     """Build the key that collapses repeated identical observations."""
 
@@ -1165,6 +1168,7 @@ def compute_dedupe_key(
             action=action,
             route=route,
             resource_id=resource_id,
+            dedupe_actor=dedupe_actor,
         )
     )
 
@@ -1578,6 +1582,7 @@ class WorkspaceSettingsService:
         client_ip: str | None = None,
         user_agent: str | None = None,
         duration_ms: int = 0,
+        dedupe_actor: str | None = None,
     ) -> bool:
         """Queue one operation for traceability. Returns whether it was queued.
 
@@ -1630,6 +1635,7 @@ class WorkspaceSettingsService:
             action=rule.action,
             route=record_fields['route'],
             resource_id=record_fields['resource_id'],
+            dedupe_actor=dedupe_actor,
         )
 
         return self._enqueue(record_fields)