Skills for Real Engineers. Straight from my .agents directory.
replica-backend
Agent skill fromJakeschincariol/replica-skill
Builds the backend of an app clone: auth, database migrations and access rules, payments with Stripe, email, background jobs and third-party integrations through official APIs only, plus a security checklist. Use when the user says "add login", "set up auth", "wire up the database", "add payments", "connect Stripe", "add Google Calendar", "send emails", "backend for my clone", or when /replica-build is running on fake data.
How to install replica-backend
npx skills add Jakeschincariol/replica-skill# or add only this skill to Claude Code: copy the folder
replica-backend/
# into
~/.claude/skills/replica-backend/ (all projects)
.claude/skills/replica-backend/ (one project)
1# replica-backend23Reads `replica/architecture.md`. Writes migrations and server code, and keeps4`replica/backend.md` (checklist below) up to date.56## The rules78- **Official, public APIs only, with the user's own keys.** Never call the9 original app's private endpoints, never reuse its OAuth client, never proxy10 through it.11- **The user creates accounts and keys.** Claude never signs up for services,12 never types a password, card or live key. The user creates the Stripe,13 Supabase, Resend or Google Cloud project and puts keys in `.env.local`.14 Claude writes `.env.example` with every variable name and no values.15- **Test mode first.** Stripe test keys and test cards until replica-deploy.1617## Auth1819- Email sign up with verification, password reset, magic link if the original20 has it. OAuth (Google, Apple) with the user's own developer apps.21- Sessions: http-only secure cookies. Sign out everywhere.22- Roles and teams if the recon map has them: owner, admin, member, with one23 function that answers "can this user do this to this record".24- Account deletion that actually deletes. Apple requires it for apps with25 sign up.2627## Database2829- Migrations from `architecture.md`, checked in, run by a script.30- Access rules on every table: row level security policies on Supabase, or31 the authorisation function called in every query. Test it: a second user32 must get nothing back.33- Seed script with realistic fake data (no real people).34…
Excerpt shown under the repository's MIT license.
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