diff --git a/docs/openbao-public-listener-transition.md b/docs/openbao-public-listener-transition.md
index c9e6068..9757882 100644
--- a/docs/openbao-public-listener-transition.md
+++ b/docs/openbao-public-listener-transition.md
@@ -29,6 +29,22 @@ http://127.0.0.1:18200/ui/vault/auth/netkingdom/oidc/callback
 Record only a value-safe attended-login result. Do not record the authorization
 code, token, accessor, callback query, browser storage, or screenshots.
 
+KeyCape admission is applied by the Net Kingdom owner procedure. Apply the
+OpenBao half through the governed contained login lane; the child command is
+silent and Warden self-revokes the attended session:
+
+```bash
+warden plan \
+  "attended OpenBao platform administration to add the exact operator-tunneled OIDC callback to auth/netkingdom/role/platform-admin" \
+  --json
+warden access openbao-platform-admin-login --exec -- \
+  scripts/openbao-apply-operator-loopback-callback.sh
+```
+
+The plan must return `founder_required` and select
+`openbao-platform-admin-login`. Do not run the owner command directly with a
+persistent token.
+
 ## Guarded sequence
 
 ```bash
diff --git a/scripts/openbao-apply-operator-loopback-callback.sh b/scripts/openbao-apply-operator-loopback-callback.sh
new file mode 100755
index 0000000..a632be5
--- /dev/null
+++ b/scripts/openbao-apply-operator-loopback-callback.sh
@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+# Silent owner command for the governed openbao-platform-admin-login lane.
+# Warden rejects any child output and self-revokes the attended session after
+# this command exits. The role payload contains no secret values.
+
+set -euo pipefail
+
+ROLE_PATH="auth/netkingdom/role/platform-admin"
+CALLBACK_URI="http://127.0.0.1:18200/ui/vault/auth/netkingdom/oidc/callback"
+PAYLOAD="$(mktemp "${TMPDIR:-/tmp}/openbao-platform-admin-role.XXXXXX.json")"
+READBACK="$(mktemp "${TMPDIR:-/tmp}/openbao-platform-admin-readback.XXXXXX.json")"
+
+cleanup() {
+  rm -f "$PAYLOAD" "$READBACK"
+}
+trap cleanup EXIT INT TERM
+chmod 0600 "$PAYLOAD" "$READBACK"
+
+command -v bao >/dev/null 2>&1
+command -v python3 >/dev/null 2>&1
+
+cat >"$PAYLOAD" <<'ROLE_JSON'
+{
+  "role_type": "oidc",
+  "user_claim": "sub",
+  "groups_claim": "groups",
+  "oidc_scopes": ["openid", "profile", "email", "groups"],
+  "allowed_redirect_uris": [
+    "http://localhost:8250/oidc/callback",
+    "http://127.0.0.1:8250/oidc/callback",
+    "http://127.0.0.1:18200/ui/vault/auth/netkingdom/oidc/callback",
+    "https://bao.coulomb.social/ui/vault/auth/netkingdom/oidc/callback",
+    "https://bao.coulomb.social/ui/vault/auth/keycape/oidc/callback"
+  ],
+  "bound_claims": {
+    "groups": ["net-kingdom-admins"]
+  },
+  "claim_mappings": {
+    "email": "email",
+    "preferred_username": "username"
+  },
+  "policies": ["platform-admin"],
+  "ttl": "1h"
+}
+ROLE_JSON
+
+bao write "$ROLE_PATH" @"$PAYLOAD" >/dev/null 2>&1
+bao read -format=json "$ROLE_PATH" >"$READBACK" 2>/dev/null
+python3 - "$READBACK" "$CALLBACK_URI" <<'PY' >/dev/null 2>&1
+import json
+import sys
+
+path, callback = sys.argv[1:]
+with open(path, encoding="utf-8") as handle:
+    role = json.load(handle).get("data") or {}
+
+if callback not in role.get("allowed_redirect_uris", []):
+    raise SystemExit(1)
+if role.get("role_type") != "oidc":
+    raise SystemExit(1)
+if "platform-admin" not in role.get("token_policies", role.get("policies", [])):
+    raise SystemExit(1)
+PY
diff --git a/tests/test_openbao_operator_loopback_callback.py b/tests/test_openbao_operator_loopback_callback.py
new file mode 100644
index 0000000..5f9a481
--- /dev/null
+++ b/tests/test_openbao_operator_loopback_callback.py
@@ -0,0 +1,78 @@
+import json
+import os
+import subprocess
+from pathlib import Path
+
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+SCRIPT = REPO_ROOT / "scripts/openbao-apply-operator-loopback-callback.sh"
+CALLBACK = "http://127.0.0.1:18200/ui/vault/auth/netkingdom/oidc/callback"
+
+
+def _fake_bao(tmp_path: Path) -> tuple[Path, Path]:
+    capture = tmp_path / "written-role.json"
+    executable = tmp_path / "bao"
+    executable.write_text(
+        """#!/bin/sh
+set -eu
+if [ "$1" = "write" ]; then
+  cp "${3#@}" "$BAO_CAPTURE"
+  exit 0
+fi
+if [ "$1" = "read" ]; then
+  if [ "${BAO_FAKE_MISSING_CALLBACK:-false}" = "true" ]; then
+    printf '%s\\n' '{"data":{"role_type":"oidc","token_policies":["platform-admin"],"allowed_redirect_uris":[]}}'
+  else
+    printf '%s\\n' '{"data":{"role_type":"oidc","token_policies":["platform-admin"],"allowed_redirect_uris":["http://127.0.0.1:18200/ui/vault/auth/netkingdom/oidc/callback"]}}'
+  fi
+  exit 0
+fi
+exit 2
+""",
+        encoding="utf-8",
+    )
+    executable.chmod(0o755)
+    return executable, capture
+
+
+def _run(tmp_path: Path, *, missing_callback: bool = False) -> tuple[subprocess.CompletedProcess[str], Path]:
+    _, capture = _fake_bao(tmp_path)
+    env = dict(os.environ)
+    env.update(
+        {
+            "PATH": f"{tmp_path}:{env['PATH']}",
+            "TMPDIR": str(tmp_path),
+            "BAO_CAPTURE": str(capture),
+            "BAO_FAKE_MISSING_CALLBACK": str(missing_callback).lower(),
+        }
+    )
+    result = subprocess.run(
+        [str(SCRIPT)],
+        cwd=REPO_ROOT,
+        env=env,
+        text=True,
+        capture_output=True,
+        check=False,
+    )
+    return result, capture
+
+
+def test_contained_command_is_silent_and_writes_exact_role(tmp_path: Path) -> None:
+    result, capture = _run(tmp_path)
+    assert result.returncode == 0
+    assert result.stdout == ""
+    assert result.stderr == ""
+
+    role = json.loads(capture.read_text(encoding="utf-8"))
+    assert CALLBACK in role["allowed_redirect_uris"]
+    assert role["policies"] == ["platform-admin"]
+    assert role["bound_claims"] == {"groups": ["net-kingdom-admins"]}
+    assert not list(tmp_path.glob("openbao-platform-admin-*.json"))
+
+
+def test_verification_failure_remains_silent_and_nonzero(tmp_path: Path) -> None:
+    result, _ = _run(tmp_path, missing_callback=True)
+    assert result.returncode != 0
+    assert result.stdout == ""
+    assert result.stderr == ""
+    assert not list(tmp_path.glob("openbao-platform-admin-*.json"))
diff --git a/workplans/RAILIANCE-WP-0027-openbao-operator-only-access.md b/workplans/RAILIANCE-WP-0027-openbao-operator-only-access.md
index 7e44267..2143fc6 100644
--- a/workplans/RAILIANCE-WP-0027-openbao-operator-only-access.md
+++ b/workplans/RAILIANCE-WP-0027-openbao-operator-only-access.md
@@ -69,5 +69,12 @@ lifecycle-healthy and reaches the expected overlay. Then execute the guarded
 retraction, coordinate public DNS withdrawal with railiance-infra, and return
 non-secret acceptance evidence to Railiance Master.
 
+Net Kingdom revision `61aeafe` additionally applied the exact KeyCape callback
+live and proved the public authorization endpoint accepts it. Railiance
+Platform now carries the silent, narrowly scoped
+`scripts/openbao-apply-operator-loopback-callback.sh` owner command for the
+governed `openbao-platform-admin-login` lane. The remaining hold is one
+attended OIDC/MFA execution of that command followed by one loopback UI login.
+
 This workplan authorizes no OpenBao seal/unseal, policy broadening, PVC or
 Secret mutation, reboot, restore, or RMASTER-WP-0020-T08 cleanup.