diff --git a/README.md b/README.md
index 2a53fda..426996e 100644
--- a/README.md
+++ b/README.md
@@ -70,6 +70,7 @@ if status["status"] == "verified":
 # for an existing operator credential.
 client.create_session(address="0x...")
 client.create_session(operator_token="opc_...")  # KYC refresh
+client.create_session(kind="sign_in")  # registration-only: account sign-in, no identity documents
 ```
 
 ### Wallet resolution
diff --git a/agentscore/client.py b/agentscore/client.py
index 4223ff5..d8a6c76 100644
--- a/agentscore/client.py
+++ b/agentscore/client.py
@@ -4,7 +4,7 @@
 import logging
 import time
 from importlib.metadata import version as _pkg_version
-from typing import TYPE_CHECKING, Any
+from typing import TYPE_CHECKING, Any, Literal
 
 import httpx
 
@@ -308,12 +308,17 @@ def create_session(
         product_name: str | None = None,
         address: str | None = None,
         operator_token: str | None = None,
+        kind: Literal["kyc", "sign_in"] | None = None,
     ) -> SessionCreateResponse:
         """Create an assessment session for deferred scoring.
 
         ``address`` pre-associates the session with a known wallet (EVM ``0x...`` or
         Solana base58). ``operator_token`` pre-associates with an existing ``opc_...`` —
-        e.g. refresh KYC for a credential.
+        e.g. refresh KYC for a credential. ``kind`` selects the session kind: ``"kyc"``
+        (the API default) runs identity verification; ``"sign_in"`` is registration-only
+        (the buyer signs in with an AgentScore account, no identity documents) and mints a
+        ``sign_in``-scoped credential, for merchants that key durable state on the account
+        without any compliance policy.
         """
         body: dict[str, Any] = {}
         if context is not None:
@@ -324,6 +329,8 @@ def create_session(
             body["address"] = address
         if operator_token is not None:
             body["operator_token"] = operator_token
+        if kind is not None:
+            body["kind"] = kind
         client = self._get_sync_client()
         return self._send_sync(lambda: client.post("/v1/sessions", json=body))
 
@@ -451,12 +458,17 @@ async def acreate_session(
         product_name: str | None = None,
         address: str | None = None,
         operator_token: str | None = None,
+        kind: Literal["kyc", "sign_in"] | None = None,
     ) -> SessionCreateResponse:
         """Create an assessment session for deferred scoring.
 
         ``address`` pre-associates the session with a known wallet (EVM ``0x...`` or
         Solana base58). ``operator_token`` pre-associates with an existing ``opc_...`` —
-        e.g. refresh KYC for a credential.
+        e.g. refresh KYC for a credential. ``kind`` selects the session kind: ``"kyc"``
+        (the API default) runs identity verification; ``"sign_in"`` is registration-only
+        (the buyer signs in with an AgentScore account, no identity documents) and mints a
+        ``sign_in``-scoped credential, for merchants that key durable state on the account
+        without any compliance policy.
         """
         body: dict[str, Any] = {}
         if context is not None:
@@ -467,6 +479,8 @@ async def acreate_session(
             body["address"] = address
         if operator_token is not None:
             body["operator_token"] = operator_token
+        if kind is not None:
+            body["kind"] = kind
         client = self._get_async_client()
         return await self._send_async(lambda: client.post("/v1/sessions", json=body))
 
diff --git a/agentscore/types.py b/agentscore/types.py
index 00be467..97cc402 100644
--- a/agentscore/types.py
+++ b/agentscore/types.py
@@ -395,6 +395,8 @@ class _SessionCreateResponseRequired(TypedDict):
 
 
 class SessionCreateResponse(_SessionCreateResponseRequired, total=False):
+    # The kind the session was minted with; absent on older API responses.
+    kind: Literal["kyc", "sign_in"]
     # Structured next_steps with action=deliver_verify_url_and_poll.
     next_steps: SessionCreateNextSteps
     # Cross-merchant memory hint on first session creation.
diff --git a/pyproject.toml b/pyproject.toml
index eb24ba8..d2f1958 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "agentscore-py"
-version = "2.6.8"
+version = "2.6.9"
 description = "Python client for the AgentScore APIs"
 readme = "README.md"
 license = "MIT"
diff --git a/tests/test_client.py b/tests/test_client.py
index cbc85f9..2c096a3 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -1023,10 +1023,12 @@ def test_create_session_with_first_class_fields():
     client.create_session(
         context="wine purchase verification",
         product_name="Cabernet Reserve 2022",
+        kind="sign_in",
     )
     body = json.loads(route.calls.last.request.content)
     assert body["context"] == "wine purchase verification"
     assert body["product_name"] == "Cabernet Reserve 2022"
+    assert body["kind"] == "sign_in"
 
 
 @respx.mock
@@ -1037,6 +1039,7 @@ def test_create_session_omits_none_fields():
     body = json.loads(route.calls.last.request.content)
     assert "context" not in body
     assert "product_name" not in body
+    assert "kind" not in body
 
 
 @respx.mock
diff --git a/uv.lock b/uv.lock
index 123ba44..7923dbe 100644
--- a/uv.lock
+++ b/uv.lock
@@ -7,7 +7,7 @@ prerelease-mode = "disallow"
 
 [[package]]
 name = "agentscore-py"
-version = "2.6.8"
+version = "2.6.9"
 source = { editable = "." }
 dependencies = [
     { name = "httpx" },