diff --git a/tests/proxy_behavior/management/actors.py b/tests/proxy_behavior/management/actors.py
index 6ac8ba4e303..f3982c18e85 100644
--- a/tests/proxy_behavior/management/actors.py
+++ b/tests/proxy_behavior/management/actors.py
@@ -182,6 +182,11 @@ async def seed_world(prisma: PrismaClient) -> World:
         )
 
     # Teams.
+    # NOTE: _get_user_in_team in key_management_endpoints.py checks
+    # ``members_with_roles`` (a JSON array of {user_id, role}), NOT the plain
+    # ``members`` String[] column — so the JSON list is what the team-key authz
+    # gate inspects. Populate both to match what the real /team/new handler
+    # would produce.
     await prisma.db.litellm_teamtable.create(
         data={
             "team_id": TEAM_ALPHA,
@@ -195,6 +200,15 @@ async def seed_world(prisma: PrismaClient) -> World:
                 user_ids[Actor.UNRELATED_SAME_ORG],
                 user_ids[Actor.SERVICE_ACCOUNT],
             ],
+            "members_with_roles": Json(
+                [
+                    {"user_id": user_ids[Actor.TEAM_ADMIN], "role": "admin"},
+                    {"user_id": user_ids[Actor.INTERNAL_USER], "role": "user"},
+                    {"user_id": user_ids[Actor.OWNER], "role": "user"},
+                    {"user_id": user_ids[Actor.UNRELATED_SAME_ORG], "role": "user"},
+                    {"user_id": user_ids[Actor.SERVICE_ACCOUNT], "role": "user"},
+                ]
+            ),
         }
     )
     await prisma.db.litellm_teamtable.create(
@@ -204,6 +218,11 @@ async def seed_world(prisma: PrismaClient) -> World:
             "organization_id": ORG_B,
             "admins": [],
             "members": [user_ids[Actor.CROSS_ORG_USER]],
+            "members_with_roles": Json(
+                [
+                    {"user_id": user_ids[Actor.CROSS_ORG_USER], "role": "user"},
+                ]
+            ),
         }
     )
 
diff --git a/tests/proxy_behavior/management/test_key_generate.py b/tests/proxy_behavior/management/test_key_generate.py
new file mode 100644
index 00000000000..22cf681136d
--- /dev/null
+++ b/tests/proxy_behavior/management/test_key_generate.py
@@ -0,0 +1,111 @@
+"""Slice 7 — actor × target authz matrix for ``POST /key/generate``.
+
+The matrix pins the proxy's current authorization behavior for key creation.
+Two boundary axes:
+
+  * **Self-create.** Each of the 8 seeded actors creates a key with no
+    ``team_id`` / no ``user_id`` override. The expected outcome is the actor's
+    current right to create a virtual key for themselves.
+  * **Cross-scope create.** A subset of actors create a key scoped to a team
+    that may or may not match their org / team membership. This is the IDOR
+    boundary — a passing test means an unauthorized actor was *correctly*
+    blocked; a failing test (after a refactor) means the boundary moved.
+
+Expected status codes were observed against the real handler and pinned here.
+Future PRs that change these codes will turn this matrix red, surfacing the
+behavior change for review.
+"""
+
+from typing import Any, Dict, Optional
+
+import pytest
+
+from .actors import TEAM_ALPHA, TEAM_BETA, Actor
+from .conftest import MASTER_KEY
+
+pytestmark = pytest.mark.asyncio(loop_scope="session")
+
+
+# Each row is (id, actor, body_extras, expected_status). Codes are PINNED
+# against the current handler's observed behavior — the point of these tests
+# is to red-flag *changes* to that behavior, not to assert what's ideal.
+# A future PR that flips any code here is a behavior change that needs review.
+_SCENARIOS = [
+    # ─── Self-create: actor generates a key for themselves ───────────────
+    ("self/proxy_admin", Actor.PROXY_ADMIN, {}, 200),
+    # org_admin currently 401s on /key/generate (role-gate before scope check).
+    ("self/org_admin", Actor.ORG_ADMIN, {}, 401),
+    ("self/team_admin", Actor.TEAM_ADMIN, {}, 200),
+    ("self/internal_user", Actor.INTERNAL_USER, {}, 200),
+    ("self/owner", Actor.OWNER, {}, 200),
+    ("self/unrelated_same_org", Actor.UNRELATED_SAME_ORG, {}, 200),
+    ("self/cross_org_user", Actor.CROSS_ORG_USER, {}, 200),
+    ("self/service_account", Actor.SERVICE_ACCOUNT, {}, 200),
+    # ─── team_id = team_alpha (org_a) ─────────────────────────────────────
+    ("team_alpha/proxy_admin", Actor.PROXY_ADMIN, {"team_id": TEAM_ALPHA}, 200),
+    # org_admin is blocked by the role gate before the team scope check runs.
+    ("team_alpha/org_admin", Actor.ORG_ADMIN, {"team_id": TEAM_ALPHA}, 401),
+    # team_admin is admin of team_alpha — allowed.
+    ("team_alpha/team_admin", Actor.TEAM_ADMIN, {"team_id": TEAM_ALPHA}, 200),
+    # Regular team member without key-create permissions: 401 + team_member_permission_error.
+    ("team_alpha/internal_user", Actor.INTERNAL_USER, {"team_id": TEAM_ALPHA}, 401),
+    # Cross-org user is "not assigned" — 400 fires before team-member-perms.
+    ("team_alpha/cross_org_user", Actor.CROSS_ORG_USER, {"team_id": TEAM_ALPHA}, 400),
+    # ─── team_id = team_beta (org_b) ──────────────────────────────────────
+    ("team_beta/proxy_admin", Actor.PROXY_ADMIN, {"team_id": TEAM_BETA}, 200),
+    ("team_beta/org_admin", Actor.ORG_ADMIN, {"team_id": TEAM_BETA}, 401),
+    # team_admin is not a member of team_beta → "not assigned" 400.
+    ("team_beta/team_admin", Actor.TEAM_ADMIN, {"team_id": TEAM_BETA}, 400),
+    ("team_beta/internal_user", Actor.INTERNAL_USER, {"team_id": TEAM_BETA}, 400),
+    # cross_org_user IS a member of team_beta (no admin) → team_member_perm 401.
+    ("team_beta/cross_org_user", Actor.CROSS_ORG_USER, {"team_id": TEAM_BETA}, 401),
+]
+
+
+@pytest.mark.parametrize(
+    "actor,body_extras,expected_status",
+    [(actor, body, expected) for (_id, actor, body, expected) in _SCENARIOS],
+    ids=[scenario[0] for scenario in _SCENARIOS],
+)
+async def test_key_generate_authz_matrix(
+    actor: Actor,
+    body_extras: Dict[str, Any],
+    expected_status: int,
+    proxy_client,
+    prisma,
+    scratch,
+    world,
+):
+    seeded = world.keys[actor]
+    body: Dict[str, Any] = {"key_alias": scratch.prefix, **body_extras}
+
+    resp = await proxy_client.post(
+        "/key/generate",
+        headers={"Authorization": f"Bearer {seeded.cleartext}"},
+        json=body,
+    )
+    assert resp.status_code == expected_status, (
+        f"{actor.value} POST /key/generate {body!r} → {resp.status_code} "
+        f"(expected {expected_status}). body={resp.text}"
+    )
+
+    if expected_status == 200:
+        # Allowed: prove the row landed under the scratch namespace.
+        body_json = resp.json()
+        cleartext = body_json["key"]
+        assert cleartext.startswith("sk-")
+        rows = await prisma.db.litellm_verificationtoken.find_many(
+            where={"key_alias": scratch.prefix}
+        )
+        assert (
+            len(rows) == 1
+        ), f"{actor.value}: expected exactly one row under scratch, got {len(rows)}"
+    else:
+        # Denied: prove no row was written.
+        rows = await prisma.db.litellm_verificationtoken.find_many(
+            where={"key_alias": scratch.prefix}
+        )
+        assert rows == [], (
+            f"{actor.value}: handler returned {expected_status} but row leaked: "
+            f"{rows[0].token_id if rows else None}"
+        )