Actionable comments posted: 1

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@backend/prompt_studio/prompt_studio_core_v2/prompt_studio_helper.py`:
- Around line 264-290: Remove owner.email from the user-facing profile_ref used
by the PermissionError and replace it with a non-PII identifier, preferably the
available display name or a generic project-creator label. Preserve the existing
email-bearing server-side log in the surrounding permission-check flow, and keep
all denial branches’ guidance unchanged.

Reviewed against fcf48ba5. I ran an independent RCA of the underlying bug first (call chain, permission model, created_by provenance, git history of the check), then an adversarial verification pass over this diff.

Verdict: the fix is correct and lands at the right layer. Both real gaps are closed — the admin requester bypass (prompt_studio_helper.py:227) and the service-account creator bypass (:234). The SA bypass is load-bearing rather than belt-and-braces: is_user_organization_admin returns False for service accounts (organization_member_service.py:29-30), so the creator-admin bypass could never have fired for this customer's profile.

Particular credit for carrying the requester as a separate request_user_id instead of reusing user_id. user_id is tool.created_by.user_id — the file-path owner — at all four entry points (views.py:451/530/683/789), so the ticket's own "Proposed fix" wording ("call sites already have user_id") would have re-validated the creator and no-oped on the exact reported scenario. test_build_index_payload.py:212 pinning request_user_id != user_id is the right guard against that regressing.

The tests are genuinely behavioral, not theatre — I checked by installing main's pre-fix body behind the new signature: 5 of 10 fail, including both bypass tests and all three message tests. The 1-tuple error_msg defect is real (DRF renders .detail as a JSON array; confirmed by executing against the pinned DRF 3.17.1), and isinstance(exc.detail, str) is the only assertion that catches it — str(exc) on a list-detail still contains the email substring. Good catch.

Comments below: one P2 worth closing pre-merge (a test gap that makes future breakage silent), one sign-off ask, and three follow-ups. Nothing blocking beyond the P2.

Nit: "49/49 backend tests pass" in the description doesn't match a reproducible scope (I get 15 for the subtree, 137 for the backend unit tier).

Approving — the fix is correct, and I re-verified it still holds after the UN-2202 merge.

Verified at 4c8bbe13 by execution rather than reading. All four builders are genuinely keyword-only with no default (inspect.signature → KEYWORD_ONLY, default=empty), and every bypass is load-bearing under sabotage: deleting the admin-requester branch, the service-account branch, or the None-creator branch each fails exactly one targeted test. The rewired disjunct tests reproduce the original signature under the new model — reducing _adapter_accessible_by to owner-only fails exactly 3, and exactly the right 3. _adapter_accessible_by is byte-identical to main's (adopted, not reinvented), and no coverage was lost in the rewire: 15 test defs on both sides, the only delta a rename and a forced mock rewire. Backend unit tier green.

Worth calling out two judgement calls that went the right way: declining the Greptile suggestion (it would have dropped the service-account exclusion from is_user_organization_admin and duplicated admin-role resolution outside its one home), and catching during implementation that user_id is the file-path owner rather than plumbing it through blind — that would have no-oped on the exact reported bug.

One thing to fix before merge — the description, not the code

The "Can this PR break any existing features" section still says:

"All new parameters are trailing and optional (None default): callers that don't pass a requester (worker/legacy paths) get exactly the pre-fix validation behavior."

That was true at fcf48ba5 and was falsified by 153e4dcc — the very commit that hardened the builders. It wants rewriting rather than deleting, because the two-tier truth is the useful part:

• the four view-facing builders take request_user as required keyword-only — a dropped plumb is a TypeError;
• internal/worker paths remain None-defaulted and get pre-fix behavior.

As written it's the sentence a future contributor reads before re-adding = None and silently reverting UN-3739 — and the service-account sign-off currently sits underneath it, which undercuts the sign-off too.

Two smaller ones while you're in there:

• 3× request_user_id in What / How / Notes on Testing — it's a User object now. That's the exact confusion your own commit removed from the code; leaving it in the body invites its return.
• "49/49 backend tests pass (prompt_studio/, adapter_processor_v2/)" — that scope collects 59 at HEAD. Also worth naming the three classes that are the review response (TestCreatorAccessDisjuncts, TestBuilderSignatures, TestBuilderForwarding), since they're the interesting part of the test plan.

Best follow-up if you want one (not a gate)

The plumb type is unpinned. Changing any view to request_user=request.user.user_id passes the entire suite green — but a str is truthy and lacks .is_authenticated, so is_user_organization_admin short-circuits to False, the admin bypass silently dies, and UN-3739 is back with no failing test and no log line. It's the same shape as the hole you just closed, one layer up, and it's invited by user_id=tool.created_by.user_id sitting on the adjacent line. One thin view-level test closes it.

Related, same family: request_user is still None-defaulted on 8 functions including the guard itself — only the 4 builders are hardened. Latent today (every forward is correct), but it's the remediation surface if you ever want to make the contract uniform.

Review summary — approving with nits

Reviewed with six agents (code review, silent-failure, type design, test coverage, comments, simplification). No blocking findings; the authz core is sound and I could not break it:

• The admin/service-account bypasses grant nothing new. Both match the platform's existing adapter model — AdapterInstanceModelManager.for_user already returns the unfiltered queryset for org admins and grants service accounts every non-frictionless adapter. Not a privilege escalation.
• Every failure mode fails closed. is_user_organization_admin swallowing exceptions → False only ever removes a bypass. Under a real DB outage _adapter_accessible_by issues uncaught queries, so you get a loud 500, not a bogus 403. MultipleObjectsReturned is ruled out by the (organization, user) unique constraint.
• No breaking change. All four builders are called only from views.py, and all four pass request_user.
• Real bug fixed in passing: the old error_msg = (f"...",) trailing comma made the DRF detail a tuple; now a plain string, and pinned.
• The tests are strong. Mutation testing killed 11/15 mutants, including every bypass removal. _adapter() setting shared_to_org = False and _user() setting is_service_account explicitly are load-bearing — a bare MagicMock is auto-truthy and would have made every denial test pass vacuously. Correctly handled.

The findings worth your time, in order:

1. profile_ref tells users their own profile "was created by another user" (helper.py:273) — reachable via the most common revocation shape, and a regression against this PR's own goal.
2. _build_summarize_params is the one live hop that silently reverts (helper.py:339) — and mutation testing shows nothing catches it.
3. The summarize-profile validator call is entirely uncovered (test_build_index_payload.py) — same bug class as UN-3739, for summarize-enabled projects.
4. The new suite's Case N citations are systematically wrong (test_validate_...py:117) — two are a straight swap, three cite cases that don't exist.

The rest are genuine nits. Deliberately not raising: the getattr(owner, "is_service_account", False) idiom (matches the house convention at 8+ sites incl. organization_member_service.py:29; getattr(request_user, "user_id", None) is outright correct since request_user is legitimately None), and any value-object/NewType wrapper for the two identities — str vs User plus keyword-only already covers the residual conflation risk. The explicit-parameter plumb is the right call over a StateStore thread-local; the wider diff buys you an identity flow that can't be silently lost again.

Follow-up ticket material, not this PR: PromptStudioHelper.index_document / prompt_responder and their chain have zero callers — the request_user additions there are inert. Deleting the chain would also let you drop the = None defaults. Renaming user_id → file_owner_user_id on the four builders would make the invariant self-evident rather than test-enforced.

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