Apply this skill when authentication, authorization, permissions, roles, RBAC or ABAC policy decisions, tenants, organization or team memberships, sessions, cookies, JWTs, refresh tokens, OAuth or OIDC, passkeys, MFA, account recovery, API keys, route guards, admin access, database policies, object-level access control, atomic mutation authorization, authentication-expiry and denial taxonomy, resource-hiding responses, decision obligations, refresh retry safety, scoped long-running job authority, signed delivery URLs, credentialed event streams, private cache behavior, or account-takeover response paths are created or changed.
Installation
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Keep authentication and authorization separate, enforce permissions on the server or database for every protected request, and prevent client-only guards from being treated as a security boundary.
Authentication answers who the requester is. Authorization answers what that principal can do to this resource in this tenant right now. Login state, verified email, a valid JWT, a visible admin button, or a client redirect is not permission.
A route, resolver, controller, service, command handler, job, webhook, API client, generated SDK, UI guard, or database query starts relying on user, tenant, role, ownership, membership, or resource identity.
A change affects object-level access control, multi-tenant isolation, shared resources, signed URLs, exports, search, autocomplete, background jobs, webhooks, or admin/support tooling.
A change affects credentialed EventSource/SSE streams, WebTransport sessions, WebSocket fallback, signed delivery URLs, private file delivery, CDN/proxy cache keys, CORS credentials, cookies, or auth tokens embedded in delivery URLs.
A change modifies status code behavior for auth failures, especially 401, 403, or policy-driven 404.
A permission model, role matrix, API docs, admin docs, migration, or tests need to stay aligned with authorization behavior.
Do Not Use When
The task is only password hashing, cryptography, secure transport, secret handling, or generic privacy review with no auth or permission boundary; use security-privacy-review.
The task only adds abuse-case tests after a boundary is already understood; use security-regression-tests for that part.
The task only changes UI text for a public page and does not affect route guards, server checks, roles, sessions, or access decisions.
Required Inputs
Changed files, user goal, affected actors, protected resources, actions, tenants, organizations, teams, roles, and status-code expectations.
Authentication and denial taxonomy: missing identity, expired identity, revoked session, denied
permission, hidden resource, step-up required, policy unavailable, stale policy, and unknown policy
result, including external status and internal reason mapping.
Permission decision tuple for each changed protected action: subject, action, object, tenant or
organization, relationship path, request environment, policy version, data revision, token issue
time, and final allow or deny reason.
Effective-permission evidence, not only role names: computed capabilities, inherited
relationships, explicit denies, wildcard policies, policy-combination rules, and default-deny
behavior.
Attribute and relationship evidence for ABAC or relationship-based policy: attribute source of
truth, freshness, trust boundary, failure behavior, policy version, and explainable deny reason.
Auth middleware, framework hooks, gateway checks, session config, cookie config, JWT verifier,
refresh-token store, OAuth/OIDC callback, MFA or passkey verifier, API key verifier, and logout
or revocation code when relevant.
Route guards, client guards, server controllers, resolvers, command handlers, services, policy functions, role or permission tables, database queries, RLS, views, stored procedures, and ORM scopes.
Tenant, organization, workspace, project, team, membership, invite, suspension, ownership,
last-owner, sharing, account-recovery, and admin-support data models.
Background jobs, queue payloads, webhooks, import/export flows, search or autocomplete indexes, signed URL generation, storage keys, SSE or streaming channels, WebTransport sessions, WebSocket fallback, CDN cache, proxy cache, and permission caches when they can expose protected data.
Audit logs, admin action logs, impersonation records, denied-access logs, API docs, role matrix docs, migrations, and tests.
Revocation and cache evidence: token claim freshness, session lifetime, permission-cache key and
TTL, policy replication delay, search-index or export lag, stale queue payloads, and rollback or
shadow-evaluation behavior when policy changes.
Mutation-boundary evidence: resource and tenant predicates, policy facts, version or concurrency
guard, affected-row interpretation, and how missing, denied, hidden, stale, or raced outcomes differ.
Retry and long-running authority evidence: request idempotency, refresh single-flight or rotation
policy, operation identity, scoped job capability, budget, expiry, revocation, revalidation points,
service-takeover state, and irreversible effect boundaries.
Account-takeover and recovery evidence: login throttling, credential-stuffing controls, password
reset, magic-link, MFA reset, email change, trusted-device, session-kill, notification, and
high-risk-action hold behavior.
Configured verification intents.
Preconditions
Classify the change as authentication, authorization, or both before editing.
Identify principal, tenant, resource, action, and context for each protected operation.
Treat client-provided userId, tenantId, workspaceId, role, isAdmin, object id, API key label, token claim, and local storage value as untrusted.
For browser web apps, identify whether auth state is server-held, BFF-mediated, or token-held by
browser code. Treat local storage, session storage, URL tokens, and JavaScript-readable long-lived
tokens as exposure risks, not neutral implementation details.
Find the current policy source of truth. If authorization is scattered across routes, do not add another scattered condition without first considering a central policy function.
Know whether the product intentionally hides resource existence with 404 or exposes permission denial with 403.
If SSE, WebTransport, WebSocket fallback, signed URL, CORS, cookie, CDN cache, proxy cache, or streaming delivery behavior changes, use http-delivery-streaming for the transport contract while this skill checks access control.
Allowed Edits
Add or tighten server-side authorization checks, policy functions, database scopes, RLS, query constraints, audit logs, docs, and tests.
Adjust client guards only as UX, and only while keeping or adding server/database enforcement.
Add role or permission migration logic only with deny-by-default behavior and explicit backfill rationale.
Keep docs, generated clients, role matrices, status-code behavior, and tests synchronized with changed auth behavior.
Procedure
Classify the boundary:
authentication: verifies a principal from a session, cookie, JWT, refresh token, OAuth/OIDC
account, passkey, MFA event, API key, service account, reset token, magic link, or anonymous
state;
authorization: decides whether that principal can perform an action on a resource within a tenant and context.
Keep AUTHENTICATION_REQUIRED, SESSION_EXPIRED, SESSION_REVOKED, PERMISSION_DENIED,
RESOURCE_HIDDEN, STEP_UP_REQUIRED, and POLICY_UNAVAILABLE distinct when callers or
operators need different recovery. Do not disguise policy infrastructure failure as user denial.
background jobs, queues, webhooks, import/export, file storage, signed URLs, SSE or streaming channels, WebTransport sessions, WebSocket fallback, search, autocomplete, caches, CDN or proxy cache rules, audit logs, docs, migrations, and tests.
Write the permission decision inputs for each protected action: principal, tenant, resource, action, and context.
Freeze the authorization decision tuple.
Record subject, action, object, tenant, environment, policy version, data revision, token issue
time, matched policy, inheritance path, and final allow or deny reason.
A role label is not the decision. Use effective permissions and relationship paths.
Do not reduce the result to a bare boolean when enforcement needs reason, policy version,
validity window, field masking, row filtering, rate or amount limits, step-up, extra audit, or
another obligation. The happy path must apply obligations returned with the allow decision.
Permission-cache identity must include every decision dimension that can change the result,
including tenant, action, resource state, relationship, policy version, and relevant context.
Separate identity from permission:
req.user, a valid session, verified email, valid JWT, OAuth scope, or API key proves identity only;
owner, active member, org admin, global admin, support user, service account, API client, and shared-link viewer need separate authorization rules.
Prefer one central policy shape, such as a can(principal, action, resource, context) function, over route-local isAdmin, isOwner, or isMember fragments.
Require explainable policy decisions.
A production-supportable permission engine should expose which policy matched, which condition
failed, which inherited relationship granted access, and whether an explicit deny won.
If the implementation cannot explain allow or deny decisions, report observability risk before
claiming the policy is maintainable.
Enforce deny by default. New roles, actions, resource types, tenant types, sharing modes, and admin paths must deny until explicitly allowed.
Define policy-combination semantics. Check whether multiple policies combine by union,
intersection, priority, explicit deny, boundary policy, or tenant override; write tests for
allow-plus-deny and no-match cases.
Check ABAC and relationship-policy inputs.
Subject attributes, object attributes, device posture, employment status, department,
resource classification, IP or region, and time windows are only useful when their source of
truth, freshness, tamper resistance, and unknown-value behavior are explicit.
Attribute fetch failure, policy-store timeout, stale policy bundle, or missing relationship
data should deny or degrade to a documented low-risk mode, not silently allow.
Validate every request. Do not rely on login-time checks, client guards, disabled buttons, hidden menus, generated types, OpenAPI docs, or mobile local checks.
Enforce final resource/action authority at the mutation or authoritative read boundary. Prefer
tenant, resource state, permission-relevant relation, and version predicates in the same
conditional update, delete, lock, stored procedure, RLS policy, or transaction that changes data.
Treat zero affected rows as an unresolved classification until repository policy distinguishes
missing, hidden, denied, stale-version, invalid-state, or raced outcomes. Never report success
merely because the query completed without throwing.
Load resources safely before final authorization:
include tenant, membership, owner, sharing, and soft-delete constraints in the resource lookup when possible;
when existence must be hidden, keep wrong-tenant and missing-resource behavior consistent with the project's 404 policy.
Keep external enumeration-safe behavior separate from internal evidence. A hidden resource may
return the same public 404 and comparable timing as absence while internal audit records retain
a safe actor, tenant, action, resource hash, policy version, and hidden-denial reason.
Check multi-tenant and organization/team risks:
body, query, header, path, JWT claim, or local storage tenant ids must not become trusted tenant context;
tenant-scoped queries must include tenant or membership constraints;
pending, suspended, removed, revoked, deleted, disabled, and invited states must not be treated as active access;
user-level roles must not stand in for organization, team, project, billing, security, or
support scope;
invitations need target email, target organization, target role, single-use, expiration, and
accepter-identity binding;
owner transfer, owner removal, organization deletion, and account deletion must preserve a
last-owner or break-glass policy with audit and time bounds.
shared links, exports, signed URLs, previews, search, cache, and CDN entries must stay inside the permission model.
event streams, WebTransport sessions, WebSocket fallback channels, private downloads, and reconnect URLs must not bypass tenant, resource, role, token expiry, or revocation policy.
Check session, browser-token, JWT, refresh-token, OAuth/OIDC, MFA, recovery, and API-key
contracts when touched:
browser web apps should prefer server sessions or BFF-mediated tokens with HttpOnly,
Secure, appropriately scoped SameSite, and preferably host-only cookies; broad domain
cookies and JavaScript-readable long-lived tokens need an explicit risk decision.
sessions need idle expiry, absolute expiry, renewal, session-id rotation, logout, all-device
revocation, server-side invalidation, cookie flags, and CSRF posture;
refresh tokens need hash storage, family or device binding, rotation, reuse detection,
single-flight or short grace handling for multi-tab and retry races, and revocation triggers;
automatic replay after refresh is safe only when the original operation is read-only or has a
stable idempotency key and authoritative result lookup. A 401 does not prove a write never ran;
coordinate refresh per session or token family. Independent refresh attempts from concurrent
requests or tabs can invalidate a rotating family or misclassify normal races as theft;
JWTs need signature verification, algorithm allowlist, issuer, audience, subject, expiry, not-before, key rotation, and stale-claim handling;
OAuth/OIDC needs exact redirect binding, state, nonce, PKCE when relevant, provider account binding, and safe account linking;
password reset, magic-link, email change, and account recovery tokens need purpose binding,
single use, short expiry, safe storage, enumeration-safe responses, and post-success session
invalidation;
MFA and passkey flows need step-up policy, recovery-code storage, reset policy, phishing
resistance expectations, trusted-device boundaries, and failure notifications;
API keys need hashing, prefix-only display, owner type, scope, tenant/resource constraints, expiry, rotation, revocation, last-used, rate limit, and audit.
Check permission creators more strictly than ordinary permissions.
Role creation, role assignment, invitation, service-account issuance, API-key creation,
impersonation, support access, MFA reset, account recovery, email change, ownership transfer,
and token minting are privilege factories.
A low-privilege actor that can attach a high privilege to itself collapses the whole model.
Check revocation time.
Demotion, removal, suspension, role deletion, membership expiry, subscription cancellation,
ownership transfer, password change, MFA change, email change, account recovery, refresh-token
reuse, suspected account takeover, and support access expiry should say how long old sessions,
refresh tokens, JWT claims, caches, search indexes, queued jobs, signed URLs, and replicas can
keep authorizing the old state.
Sensitive actions need server-side recheck, short-lived tokens, revocation lists, or policy
version gates when stale tokens would be harmful.
Long-running work should carry a job-scoped authority containing operation, resources, tenant,
budget or limit, policy version, expiry, and owner instead of persisting a general user token.
Revalidate before irreversible privacy export, payment, publication, permission grant, or other
high-impact effects.
If work must continue after user revocation, represent explicit service takeover with reason,
audit, scope, and state. Do not silently extend the user's authority.
Check account-takeover response paths.
Login, signup, password reset, magic link, OTP, MFA, invite acceptance, email verification,
API-key creation, and support impersonation need rate limits, account/IP/device dimensions,
enumeration-safe responses, audit events, and notification policy.
High-risk sequences such as new-device login followed by MFA reset, email change, API-key
creation, organization invite, export, billing change, or ownership transfer should trigger
step-up, hold, read-only quarantine, or session revocation according to product risk.
Check dependent surfaces: API routes, controllers, services, DB schema, DB queries, RLS, UI navigation, UI actions, API clients, audit logs, notifications, jobs, webhooks, search, file storage, docs, migrations, monitoring, and tests.
For credentialed delivery surfaces, check whether EventSource can supply the intended credentials, whether CORS and cookies match the policy, whether signed URLs expire and scope correctly, and whether caches vary on auth, tenant, and private response dimensions.
Require denial-first tests for changed protected actions when the project has a usable test surface. Cover anonymous, expired, revoked, no role, wrong tenant, wrong team, wrong owner, suspended or removed member, stale token, refresh-token reuse and concurrent refresh, stale cache, unknown role, unknown action, wildcard policy, explicit deny, hidden resource, step-up required, policy unavailable, affected-row zero, permission changed during the request or job, shared-link, read-only API key, org admin, team admin, billing admin, global admin, support user, and impersonating admin cases as applicable.
When changing policies, consider shadow evaluation.
Compute old and new decisions side by side for representative requests before flipping broad
policy changes when the product has the infrastructure to do so.
Log policy version and data revision for both decisions without exposing secrets or sensitive
object contents.
Update docs and role matrices when external behavior, status codes, role names, permission names, admin scope, or API errors change.
Report the policy source of truth, effective-permission evidence, decision explanation, server/database enforcement, client UX-only guards, revocation window, account-takeover response, test coverage, skipped checks, and remaining permission risk.
Boundary Rules
Client guards are UX only. They may hide buttons, menus, and pages, but they do not authorize API calls.
Route middleware may perform coarse authentication and tenant resolution, but final resource/action authorization belongs in server policy, service authorization, gateway policy, or database policy.
Database RLS, tenant-scoped queries, views, and stored procedures are defense-in-depth and may be the strongest final boundary, but they do not excuse unclear application policy.
Background jobs, webhooks, imports, exports, and cron paths need actor or service-principal context. User-request paths are not the only permission paths.
Admin is scoped. Global admin, org admin, project admin, billing admin, support, and impersonating admin are different roles and need different audit and action rules.
Organization and team membership are authorization relationships, not user attributes. A user can
be owner in one organization, viewer in another, removed from a team, and still retain a direct
resource grant unless the policy says otherwise.
Owner is not a wildcard permission. Owners may still lack delete, export, invite, transfer, billing, or admin powers.
API keys are principals with scopes and owners, not user sessions with unlimited power.
ABAC inputs are security dependencies. Unknown, stale, or client-controlled attributes should not
become allow decisions.
Account recovery, MFA reset, email change, and invite acceptance are login-equivalent or
privilege-factory flows.
Wildcard permissions are future permissions. Adding a new action under an old wildcard should be
treated as a permission expansion and reviewed accordingly.
Unknown roles, unknown actions, malformed identifiers, and missing relationship data deny by
default; they are not normalized into a normal user path.
Relying on hidden buttons, disabled controls, client redirects, mobile checks, TypeScript types, docs, or Storybook examples as permission boundaries.
Reading tenant-scoped resources with an object id alone.
Treating membership row existence as active membership without checking status.
Treating OAuth provider scopes as internal app permissions.
Treating JWT role claims as fresh authorization after role changes.
Storing long-lived browser auth tokens in local storage or URLs without an explicit browser-threat
model and revocation plan.
Treating refresh tokens as harmless because access tokens are short-lived.
Accepting OAuth account links by email alone instead of provider issuer and subject plus
reauthentication.
Treating API keys as normal user sessions.
Mixing org admin, global admin, support admin, and impersonation into one admin check.
Treating team membership, invitation, account recovery, or last-owner handling as UI workflow
only.
Changing 403 to 404, or 404 to 403, without naming the information-disclosure policy.
Relaxing permissions without denial-case tests or a written migration and audit plan.
Letting role changes ship without permission-cache or token-staleness handling.
Shipping a permission engine that cannot explain why a request was allowed or denied.
Treating an effective-permission bug as solved because the role column looks correct.
Treating token-embedded roles as fresh after demotion, removal, or policy version changes.
Treating a bare boolean permission result as sufficient when obligations, validity, or policy
failure affect enforcement.
Replaying a state-changing request automatically after authentication refresh without durable
idempotency and authoritative result lookup.
Persisting a general user token in long-running work or silently extending user authority after
revocation.
Creating shared links, signed URLs, exports, search results, or CDN responses outside tenant and resource policy.
Creating credentialed event streams, WebTransport sessions, WebSocket fallback channels, signed delivery URLs, or private caches outside tenant and resource policy.
Logging impersonation without separate actor and subject.
Backfilling broad permissions to every existing user because migration is easier.
Postconditions
Authentication and authorization are separated in code and report language.
Every changed protected action has a server-side or database-side permission boundary.
Protected mutations bind resource, tenant, relevant authority facts, state, and concurrency at the
authoritative write boundary, and zero affected rows are not reported as success blindly.
Tenant isolation, organization or team membership, resource ownership, sharing, admin scope, and status-code behavior are explicit.
Missing identity, expiry, revocation, denial, hidden resource, step-up, and policy unavailability
remain distinct internally even when public enumeration policy intentionally collapses responses.
Effective permissions, policy-combination rules, decision explanation, policy version, data
revision, obligations, validity, and revocation window are explicit when relevant.
Authentication refresh does not replay unsafe writes, and long-running work has bounded authority,
irreversible-step revalidation, or an explicit audited service-takeover state.
Client guards are described as UX only.
Session, cookie, browser-token, refresh-token, OAuth/OIDC, MFA, passkey, recovery, API key, cache, audit, docs, migration, and tests are synchronized when touched.
Signed URL, event-stream, WebTransport, WebSocket fallback, CORS, cookie, CDN/proxy cache, and reconnect behavior remains inside the permission model when touched.
Verification
Use configured oneshot command intents when available:
changes_status
changes_diff_summary
lint
build
test_related
test
docs_validate_fast
test_release
mustflow_check
Prefer the narrowest configured test intent that covers the changed protected actions and denial cases. Report missing auth-specific policy tests, tenant-isolation tests, organization/team permission tests, token/session/refresh-token tests, account-recovery tests, API-key tests, cache-staleness tests, audit-log checks, docs validation, or database-policy verification when relevant.
Failure Handling
If the current policy source of truth is unclear, stop and report the competing policy locations before adding more checks.
If a server check is missing and only the UI hides the action, treat it as incomplete work, not as authorization.
If a tenant-scoped query lacks tenant, membership, ownership, sharing, or RLS coverage, fix the data access path before broadening features.
If denial tests cannot be written in the current task, report the exact untested actor, tenant, resource, action, and context combinations.
If the change relaxes permissions, changes status-code policy, or broadens admin/API-key behavior, call out the security risk and required verification.
Output Format
Boundary checked
Authentication versus authorization classification
Principal, tenant, resource, action, and context affected
Policy source of truth
Effective permission, policy version, data revision, decision explanation, and revocation window
Authentication and denial taxonomy, public mapping, hidden-resource policy, and internal audit evidence
Decision obligations, validity, and permission-cache dimensions
Atomic mutation and affected-row classification notes
Refresh replay, single-flight, scoped job authority, revalidation, and service-takeover notes
