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diff --git a/packages/meshbay-hub/tests/test_mnp_token.py b/packages/meshbay-hub/tests/test_mnp_token.py
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+++ b/packages/meshbay-hub/tests/test_mnp_token.py
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+"""The MNP token: a member's credential to a node, useless at the hub API.
+
+A member hands whatever token it presents to every node it connects to (the MNP
+handshake). That must not be the hub session token, which opens the hub API —
+otherwise a node operator holds a live credential for the member. `POST
+/v1/nodes/mnp-token` mints a short-lived, node-audience token for that purpose;
+these tests pin that it authorises to a node and is refused by the hub API.
+"""
+
+import pytest
+
+from meshbay_common.handshake import HandshakeError, authorize_token
+from meshbay_common.tokens import MNP_AUD
+
+
+async def _session_token(client, username="mnp_user_test"):
+    await client.post("/v1/users/register", json={
+        "username": username, "email": f"{username}@test.local", "auth_key": "k" * 44})
+    r = await client.post("/v1/users/login", json={
+        "username": username, "auth_key": "k" * 44})
+    return r.json()["access_token"]
+
+
+@pytest.mark.asyncio
+async def test_mnp_token_endpoint_needs_a_session(client):
+    # No Authorization header at all — FastAPI rejects the required header (422),
+    # like every other authenticated route; the point is it is not minted anonymously.
+    r = await client.post("/v1/nodes/mnp-token")
+    assert r.status_code in (401, 403, 422)
+
+
+@pytest.mark.asyncio
+async def test_mnp_token_is_minted_for_a_member(client):
+    tok = await _session_token(client)
+    r = await client.post("/v1/nodes/mnp-token",
+                          headers={"Authorization": f"Bearer {tok}"})
+    assert r.status_code == 200
+    assert r.json().get("mnp_token")
+
+
+@pytest.mark.asyncio
+async def test_mnp_token_is_refused_at_the_hub_api(client):
+    """The whole point: the credential a node receives opens nothing at the hub."""
+    tok = await _session_token(client, "mnp_api_test")
+    mnp = (await client.post("/v1/nodes/mnp-token",
+                             headers={"Authorization": f"Bearer {tok}"})).json()["mnp_token"]
+    # Presenting it to a hub endpoint fails.
+    r = await client.get("/v1/users/me", headers={"Authorization": f"Bearer {mnp}"})
+    assert r.status_code == 401
+
+
+@pytest.mark.asyncio
+async def test_a_session_token_is_refused_by_a_node_but_the_mnp_token_is_not(client):
+    """The mirror image, at the node's decode: the session token (what the API
+    accepts) is refused by `authorize_token`, and the MNP token is accepted."""
+    from meshbay_hub.auth import hub_public_key_pem
+
+    # Make the member a member of a group so the MNP token carries it.
+    tok = await _session_token(client, "mnp_node_test")
+    H = {"Authorization": f"Bearer {tok}"}
+    gid = (await client.post("/v1/groups", headers=H, json={
+        "name": "g", "visibility": "private", "join_policy": "invite"})).json()["group_id"]
+    mnp = (await client.post("/v1/nodes/mnp-token", headers=H)).json()["mnp_token"]
+    pk = hub_public_key_pem()
+
+    # The session token is refused by the node handshake (wrong audience).
+    with pytest.raises(HandshakeError):
+        authorize_token(tok, pk, group_id=gid)
+    # The MNP token authorises the member to the node.
+    peer = authorize_token(mnp, pk, group_id=gid)
+    assert peer.group_id == gid