diff --git a/plans/audit-core-openbao-runtime-custody.md b/plans/audit-core-openbao-runtime-custody.md
index 2c32185..edb9bd1 100644
--- a/plans/audit-core-openbao-runtime-custody.md
+++ b/plans/audit-core-openbao-runtime-custody.md
@@ -3,9 +3,9 @@ id: audit-core-openbao-runtime-custody
 demand_source: audit-core/workplans/AUDIT-WP-0005-T02
 consumer_repo: audit-core
 credential_type: openbao-approle-kv
-status: reviewed
-approved_by: null
-approved_at: null
+status: built
+approved_by: "Bernd Worsch"
+approved_at: "2026-08-13"
 created: "2026-08-13"
 updated: "2026-08-13"
 ---
@@ -118,3 +118,29 @@ is on this identity.
 **Decision:** approve, reject, or send back to phase 1.
 Approval authorizes Mason build of structure and in-cluster sender
 minting. It does not authorize printing any secret value.
+
+## 6. Build result
+
+Built 2026-08-13 after founder approve, via
+`ops_mason.executor.build_approle_kv_lane` with `reuse_policy=True` so
+the existing `external-secrets-audit-core` policy (database creds +
+senders read) was not rewritten.
+
+- reused policy `external-secrets-audit-core`;
+- created AppRole `external-secrets-audit-core` (15m / 30m / 8 uses);
+- delivered role-id/secret-id into Secret
+  `external-secrets/openbao-audit-core-approle`; local delivery dir shredded;
+- switched ClusterSecretStores `openbao-audit-core` and
+  `openbao-audit-core-database` to AppRole auth; both `Valid`;
+- ExternalSecrets remain `SecretSynced`; receiver `/readyz` still
+  `custody_class=archive`;
+- deleted interim Secret `external-secrets/openbao-audit-core-eso-token`;
+- catalog entry `audit-core-senders` already drafted in ops-warden
+  (`warden route find "audit-core senders" --all`).
+
+Empty KV path `platform/workloads/audit-core/senders` was not written:
+mason does not put values, and senders already live in-cluster. A later
+wrap-migrate can create that path without a founder paste.
+
+No secret value was printed, committed, or logged. The 15-minute
+platform-admin child used for the build was revoked.
diff --git a/src/ops_mason/executor.py b/src/ops_mason/executor.py
index 622ba1e..6f1208f 100644
--- a/src/ops_mason/executor.py
+++ b/src/ops_mason/executor.py
@@ -53,6 +53,9 @@ class AppRoleKVSpec:
     delivery_dir: Path | None = None
     bao_bin: str = "bao"
     audit_log_path: Path | None = None
+    # When True the named policy already exists (and may grant more than one
+    # KV path). Do not rewrite it — AppRole bind only.
+    reuse_policy: bool = False
 
 
 @dataclass
@@ -111,8 +114,9 @@ def build_approle_kv_lane(plan: ConstructionPlan, spec: AppRoleKVSpec) -> dict[s
             f"approved_at={plan.approved_at!r}) — refusing to build"
         )
 
-    policy_hcl = _policy_hcl(spec.kv_path, spec.kv_capabilities)
-    _run(spec.bao_bin, ["policy", "write", spec.policy_name, "-"], input_text=policy_hcl)
+    if not spec.reuse_policy:
+        policy_hcl = _policy_hcl(spec.kv_path, spec.kv_capabilities)
+        _run(spec.bao_bin, ["policy", "write", spec.policy_name, "-"], input_text=policy_hcl)
 
     _run(
         spec.bao_bin,
diff --git a/tests/test_executor.py b/tests/test_executor.py
index e4c5fea..8cd09d5 100644
--- a/tests/test_executor.py
+++ b/tests/test_executor.py
@@ -117,6 +117,29 @@ def test_build_writes_policy_approle_and_delivers_credentials(tmp_path) -> None:
     assert "secret-id-value" not in audit_text
 
 
+def test_reuse_policy_does_not_rewrite_existing_policy(tmp_path) -> None:
+    plan = _plan(tmp_path)
+    spec = _spec(tmp_path)
+    spec.reuse_policy = True
+
+    def fake_run(cmd, input=None, capture_output=True, text=True, timeout=30):
+        result = MagicMock(returncode=0, stderr="")
+        if cmd[1:3] == ["read", "-field=role_id"]:
+            result.stdout = "role-id-value\n"
+        elif "-field=secret_id" in cmd:
+            result.stdout = "secret-id-value\n"
+        else:
+            result.stdout = ""
+        return result
+
+    with patch("ops_mason.executor.subprocess.run", side_effect=fake_run) as run:
+        build_approle_kv_lane(plan, spec)
+
+    bao_cmds = [c.args[0] for c in run.call_args_list]
+    assert not any(cmd[:2] == ["bao", "policy"] for cmd in bao_cmds)
+    assert any(cmd[1:3] == ["write", "auth/approle/role/test-lane"] for cmd in bao_cmds)
+
+
 def test_build_appends_audit_record(tmp_path) -> None:
     plan = _plan(tmp_path)
     spec = _spec(tmp_path)