diff --git a/loopx/capabilities/agent_turn_recall/core.py b/loopx/capabilities/agent_turn_recall/core.py
index bce98d2a15..7bf8c42742 100644
--- a/loopx/capabilities/agent_turn_recall/core.py
+++ b/loopx/capabilities/agent_turn_recall/core.py
@@ -1,10 +1,10 @@
 from __future__ import annotations
 
-import hashlib
 import json
 from collections.abc import Mapping, Sequence
 from typing import Any
 
+from ...control_plane.digest_envelope import sha256_envelope
 from ...control_plane.runtime.public_safety import public_safe_compact_text
 from ..context_providers.base import ContextProvider
 from ..reward_memory.runtime_hooks import run_reward_memory_automatic_recall_hook
@@ -32,7 +32,7 @@ def _canonical_hash(value: object) -> str:
         sort_keys=True,
         separators=(",", ":"),
     ).encode("utf-8")
-    return "sha256:" + hashlib.sha256(encoded).hexdigest()
+    return sha256_envelope(encoded)
 
 
 def _recent_outcomes(quota_decision: Mapping[str, Any]) -> list[str]:
diff --git a/tests/architecture/test_content_digest_production_owner.py b/tests/architecture/test_content_digest_production_owner.py
index e0f21f04d9..e42a176b75 100644
--- a/tests/architecture/test_content_digest_production_owner.py
+++ b/tests/architecture/test_content_digest_production_owner.py
@@ -30,6 +30,7 @@
 
 import pytest
 
+from loopx.capabilities.agent_turn_recall import core
 from loopx.capabilities.periodic_report import (
     archive,
     audience,
@@ -58,7 +59,10 @@
 PRODUCTION_OWNER = "loopx/control_plane/digest_envelope.py"
 ENVELOPE = "sha256:"
 
-CONVERTED_SURFACES = ("loopx/capabilities/periodic_report",)
+CONVERTED_SURFACES = (
+    "loopx/capabilities/agent_turn_recall",
+    "loopx/capabilities/periodic_report",
+)
 
 
 def _fold_joined_prefix(node: ast.JoinedStr, scope: Any) -> str | None:
@@ -297,6 +301,7 @@ def _reference(data: bytes) -> str:
 @pytest.mark.parametrize(
     "helper,expected",
     [
+        (core._canonical_hash, _reference(_canonical(SAMPLE))),
         (bindings._sha256, _reference(_canonical(SAMPLE))),
         (audience._digest, _reference(_canonical(SAMPLE))),
         (machine_defaults._digest, _reference(_canonical(SAMPLE))),