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Shared checklist · Session and tenancy

Auth & Data Checklist — Sessions, Identity & Record Boundaries for Vibe Apps

A login screen is not a permission model. Prompt loops optimize for “I can sign in.” Attackers and hurried teammates optimize for the cheapest ID they can guess. Run an auth-and-data spine across session lifetime, revocation, tenancy, and object-level checks before a public domain or a store binary turns demo defaults into a cross-account leak.

30 min · senior team · leave with a clear next step

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CodeCross LLC’s auth-and-data checklist is the session and tenancy spine for vibe-coded products: who is signed in, how long the session lives, and which records that identity may read or write. We map login, refresh, logout, and object-level checks so a hidden button is not the boundary. Intent is identity plus data access—not a secrets inventory and not a store submission ritual.

Why vibe apps leak across accounts

A working sign-in is not a data boundary

Generators ship the happy path. The cheap bypass is usually another user’s ID, a stale refresh token, or a collection that was never filtered on the server.

  • localStorage is not an authorization decision

    If privileged reads trust a client flag, a guessed document ID, or a stale session, you do not have tenancy. You have a costume.

  • Sessions outlive the person who prompted them

    Missing expiry, no logout, and no kill path for a stolen cookie turn a demo login into a week-one incident.

  • Collections are filtered in the UI only

    Hiding a row is not a query constraint. Every read and write that matters is decided against a role and a resource on the server.

  • Partner and admin seats collapse into a boolean

    Multi-tenant and operator portals need explicit roles. “Admin if the client says so” fails this list.

The spine

Make who-can-touch-what visible, then assign an owner

This is not an IdP rewrite. It is a prioritized pass sized for MVP launch — identity, session, tenancy, then a short object-level walk on the APIs that take money or personal data.

01

Write the access matrix

For each core record, name who may create, read, update, and delete it. Include anonymous, member, admin, and “another tenant.”

02

Define session lifetime and revocation

Short-lived sessions, a clear logout, and a way to kill a stolen cookie. Refresh tokens never live only in client storage.

03

Enforce object-level checks on load-bearing APIs

Another user’s ID, a stale session, and a member hitting an admin path are rejected at the server — not hidden in the UI.

04

Name a data owner for backups and restore

The records that cannot be recreated get a person and a restore rehearsal. A session model without recovery is still a demo.

How to

Close vibe-coded auth and data gaps before public traffic

A session and tenancy spine you can run across builders. The output is an access matrix, not a binder.

  1. Step 01

    Map identities and freeze demo logins

    List email, OAuth, magic-link, and shared-demo paths. Kill bypasses. Write who issues the session and where it is stored.

  2. Step 02

    Set session lifetime, refresh, and revocation

    Expiry, logout, and a kill path for a stolen session. Split preview credentials from production. Do not reuse a founder cookie as the admin story.

  3. Step 03

    Build the access matrix for money and personal data

    For each collection or table, name create/read/update/delete by role. Include the “guess another ID” case.

  4. Step 04

    Prove object-level denial on the write APIs

    Exercise another user’s ID, a stale session, and a member hitting an admin route. Record what you did not test.

  5. Step 05

    Assign a data owner and a restore date

    Backups mean nothing until someone restores into isolation. Close the highest-likelihood tenancy gaps before ads.

Read next

Proof, the essay, and sibling intents

These pages are already on the site. Use them to pressure-test the bet before a call.

Internals

Related pages

Stay inside the vibe-coding cluster, or open booking and the Austin money page.

Before you book

Practical answers

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What belongs on an auth-and-data checklist that a security pass already missed?

Session lifetime, revocation, tenant isolation, and object-level checks on the records that move money or personal data. A secrets inventory can be clean while another user’s ID still reads a document. CodeCross LLC treats those as pass/fail gates so vibe MVPs do not confuse a login screen with a permission model.

How should session revocation work on a vibe-coded MVP?

Short-lived access, a refresh you can revoke, a logout that actually clears the cookie, and a way to kill a stolen session without redeploying. Multi-tenant and partner portals need per-role revocation—not a single admin boolean. We will not call auth done until someone else can follow the kill path.

What is a minimum object-level test before you invite strangers?

Sign in as user A, request user B’s record by ID, and expect a denial. Repeat for an expired session and a member hitting an admin route. CodeCross LLC starts there because vibe builders often filter in the UI and leave the API open.

How is this different from the security checklist?

Security is secrets hygiene, privilege at the server, and a short threat pass. Auth-and-data is the identity and tenancy contract those secrets protect: who the session represents and which rows that identity may touch. Run both. Cross-link /vibe-coding/security-checklist when the next gap is a leaked key rather than a guessed ID.

Name who may touch the record before you buy the traffic.

Bring the login path and one guessed-ID case. We will name the tenancy gap that would become week-one news — or tell you the matrix is already tight enough to ship.

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