diff --git a/config/callers.user-engine.draft.json b/config/callers.user-engine.draft.json
new file mode 100644
index 0000000..bfb6bb1
--- /dev/null
+++ b/config/callers.user-engine.draft.json
@@ -0,0 +1,29 @@
+{
+  "schema_version": 1,
+  "callers": [
+    {
+      "caller_id": "user-engine",
+      "source": "user-engine",
+      "token_file": "/var/run/secrets/email-connect-callers/user-engine",
+      "bindings": [
+        ["tenant:coulomb", "coulomb-social"]
+      ],
+      "operations": [
+        "send",
+        "delivery-status",
+        "status",
+        "verify",
+        "consume",
+        "cancel"
+      ],
+      "templates": [
+        "family_member.invited",
+        "family_invitation.resent"
+      ],
+      "rate_per_minute": 10,
+      "burst": 5,
+      "max_payload_bytes": 8192,
+      "adopt_legacy_verifications": true
+    }
+  ]
+}
diff --git a/docs/caller-policy-draft-2026-10-08.md b/docs/caller-policy-draft-2026-10-08.md
new file mode 100644
index 0000000..01f49f5
--- /dev/null
+++ b/docs/caller-policy-draft-2026-10-08.md
@@ -0,0 +1,42 @@
+# User-engine caller policy draft — 2026-10-08
+
+This file proposes the only caller that exists today. It is not mounted,
+`EMAIL_CONNECT_CALLERS_FILE` is not set, and no token file was created.
+EMAIL-WP-0008-T03 stays waiting until the bindings, quotas and token custody
+are approved.
+
+Source: `config/callers.user-engine.draft.json`.
+
+## What the live caller does
+
+user-engine sends invitation mail to `/v1/send` with source `user-engine` and
+templates `family_member.invited` or `family_invitation.resent`. It reads
+`/v1/status` and `/v1/delivery-status`. Registration uses
+`/v1/registration-verifications`, consume and cancel. The live registration
+allow-list is tenant `tenant:coulomb` and client `coulomb-social`
+(`USER_ENGINE_REGISTRATION_TENANTS` / `USER_ENGINE_REGISTRATION_CLIENTS` in
+`net-kingdom/sso-mfa/k8s/user-engine/runtime.yaml`). Mail and verification
+share the current `user-engine-delivery` `mail-token`. Suppression is not a
+user-engine operation and is omitted.
+
+## Proposed limits
+
+`rate_per_minute` 10 matches the live registration limit of 10 requests per
+60 seconds. Burst 5 and an 8 KiB payload cap are below the receiver ceilings
+(6000/minute, 600 burst, 128 KiB). They are proposals, not an approved quota.
+`adopt_legacy_verifications` is proposed so this original caller can still
+consume verification rows written before caller ids existed.
+
+## Gap that blocks activation
+
+Current invitation envelopes carry `tenant` and do not carry `client_id`.
+Scoped send accepts a binding only when both fields are present and admitted,
+or when both are absent and `legacy_invitation_binding` is set. A tenant
+without a client id is denied. Family invitations also use tenants other than
+`tenant:coulomb`. This draft therefore does not claim to carry current
+invitation traffic. Activation needs a user-engine change that sends an
+admitted tenant/client pair, or a separate reviewed contract change.
+
+The token path in the draft does not exist. Selecting this file on the
+running receiver would fail startup before serving traffic. Do not copy the
+shared ingest token into that path as part of this draft.
diff --git a/tests/test_caller_policy_draft.py b/tests/test_caller_policy_draft.py
new file mode 100644
index 0000000..02d0507
--- /dev/null
+++ b/tests/test_caller_policy_draft.py
@@ -0,0 +1,107 @@
+"""The user-engine draft parses and matches today's call set. It is not deployed."""
+
+import io
+import json
+from pathlib import Path
+
+from email_connect.callers import ScopedTransactionalApplication, load_callers
+from email_connect.transactional import SQLiteDeliveryStore
+
+ROOT = Path(__file__).resolve().parents[1]
+DRAFT = ROOT / "config" / "callers.user-engine.draft.json"
+TOKEN = "synthetic-user-engine-token"
+
+
+class Provider:
+    def __init__(self):
+        self.calls = []
+
+    def send(self, *args):
+        self.calls.append(args)
+        return "synthetic-reference"
+
+    def check(self):
+        return None
+
+
+def load_draft(tmp_path):
+    token = tmp_path / "token"
+    token.write_text(TOKEN + "\n")
+    document = json.loads(DRAFT.read_text(encoding="utf-8"))
+    document["callers"][0]["token_file"] = str(token)
+    path = tmp_path / "policy.json"
+    path.write_text(json.dumps(document))
+    return load_callers(path)
+
+
+def invoke(app, payload, path):
+    raw = json.dumps(payload).encode()
+    response = {}
+    body = b"".join(
+        app(
+            {
+                "PATH_INFO": path,
+                "REQUEST_METHOD": "POST",
+                "CONTENT_LENGTH": str(len(raw)),
+                "wsgi.input": io.BytesIO(raw),
+                "HTTP_AUTHORIZATION": "Bearer " + TOKEN,
+                "HTTP_IDEMPOTENCY_KEY": payload.get("id", ""),
+            },
+            lambda status, headers: response.update(status=int(status.split()[0])),
+        )
+    )
+    return response["status"], json.loads(body)
+
+
+def test_draft_admits_only_the_live_registration_pair(tmp_path):
+    policies = load_draft(tmp_path)
+    assert len(policies) == 1
+    policy = policies[0]
+    assert policy.caller_id == "user-engine"
+    assert policy.source == "user-engine"
+    assert policy.bindings == frozenset({("tenant:coulomb", "coulomb-social")})
+    assert policy.operations == frozenset(
+        {"send", "delivery-status", "status", "verify", "consume", "cancel"}
+    )
+    assert "suppress" not in policy.operations
+    assert policy.templates == frozenset({"family_member.invited", "family_invitation.resent"})
+    assert (policy.rate_per_minute, policy.burst, policy.max_payload_bytes) == (10, 5, 8192)
+    assert policy.adopt_legacy_verifications is True
+    assert policy.legacy_invitation_binding is None
+    assert policy.token == TOKEN
+    assert TOKEN not in DRAFT.read_text(encoding="utf-8")
+    assert "token" not in json.loads(DRAFT.read_text(encoding="utf-8"))["callers"][0]
+
+
+def test_current_invitation_shape_is_denied_and_registration_pair_is_allowed(tmp_path):
+    app = ScopedTransactionalApplication(
+        SQLiteDeliveryStore(str(tmp_path / "ledger.db")),
+        Provider(),
+        "https://issuer.example.test",
+        load_draft(tmp_path),
+    )
+    invitation = {
+        "id": "evt-1",
+        "type": "family_member.invited",
+        "source": "user-engine",
+        "tenant": "tenant:family",
+        "data": {"primary_email": "member@example.test", "invitation_id": "invite-1"},
+    }
+    status, body = invoke(app, invitation, "/v1/send")
+    assert status == 400 and body["error"] == "caller_scope_denied"
+    assert app.apps["user-engine"].provider.calls == []
+
+    verification = {
+        "registration_id": "reg-1",
+        "normalized_email": "member@example.test",
+        "preferred_username": "member",
+        "client_id": "coulomb-social",
+        "tenant": "tenant:coulomb",
+        "correlation_id": "trace-1",
+    }
+    status, body = invoke(app, verification, "/v1/registration-verifications")
+    assert status == 202 and body["accepted"] is True
+    assert len(app.apps["user-engine"].provider.calls) == 1
+
+    status, body = invoke(app, {"recipient": "member@example.test"}, "/v1/suppressions")
+    assert status == 403 and body["error"] == "operation_not_allowed"
diff --git a/workplans/EMAIL-WP-0007-ledger-backup-recovery.md b/workplans/EMAIL-WP-0007-ledger-backup-recovery.md
index 2263f04..e817804 100644
--- a/workplans/EMAIL-WP-0007-ledger-backup-recovery.md
+++ b/workplans/EMAIL-WP-0007-ledger-backup-recovery.md
@@ -123,3 +123,12 @@ with every existing row preserved, UID10001/network-none and no send. See
 docs/caller-deployment-2026-10-08.md. This is image/schema alignment only: T03/T04
 archive custody, first admitted offsite run/retrieval/application recovery and
 monitoring stay waiting. CSOC-WP-0015-T03 is the product acceptance follow-up.
+
+## Pair-custody preview — 2026-10-08
+
+Founder asked to start platform custody and stop before keys. railiance-platform
+`scripts/application_backup_pair_custody.py` previews CCR-2026-0037: one future
+CAS=0 write of both AWS fields, writer policy `backup-pair-writer` not admitted,
+no OpenBao call and no Scaleway key. The delivery reader remains unable to
+create the pair. T03/T04 stay wait. No receiver pause, upload, primary.env or
+timer. Review: railiance-platform/docs/credential-lane-designs/application-backup-pair-custody-2026-10-08.md.
diff --git a/workplans/EMAIL-WP-0008-scoped-transactional-callers.md b/workplans/EMAIL-WP-0008-scoped-transactional-callers.md
index 18c527d..4c2424d 100644
--- a/workplans/EMAIL-WP-0008-scoped-transactional-callers.md
+++ b/workplans/EMAIL-WP-0008-scoped-transactional-callers.md
@@ -102,3 +102,15 @@ CSOC-WP-0015; EMAIL-WP-0008-T03, EMAIL-WP-0007 and RPF-WP-0053 retain their
 canonical runtime/custody tasks. Existing personal recovery acceptance and the
 receiver revision7 deployment remain evidenced. No pending owner requirement
 is waived or marked satisfied by the original workplans' administrative closure.
+
+## User-engine policy draft — 2026-10-08
+
+Founder asked for a user-engine-only draft and no activation. Draft:
+config/callers.user-engine.draft.json. Review: docs/caller-policy-draft-2026-10-08.md.
+It names caller/source user-engine, binding tenant:coulomb/coulomb-social,
+send, delivery-status, status, verify, consume and cancel, both family
+templates, 10/minute, burst 5, 8192-byte cap, and legacy verification adoption.
+No suppress operation and no token value. Current invitation envelopes omit
+client_id, so this draft does not admit them. The token path is not created
+and EMAIL_CONNECT_CALLERS_FILE is not set. T03 stays wait for approval of
+these bindings, quotas and separate token custody.