Registry indexed
>-
>-
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Reads replica/recon.md and replica/features.csv. Writes
replica/architecture.md (template: architecture.md in this folder).
If there is no recon map, stop and run /replica-recon first. Planning a
clone from memory of what an app does is how you miss half of it.
Use what the user already knows if they have a stack. Otherwise the default, because every part is managed, documented and cheap at zero users:
| layer | default | swap for |
|---|---|---|
| web app | Next.js (App Router) + TypeScript | Remix, SvelteKit, Rails |
| styling | Tailwind, tokens from replica-design | CSS modules |
| mobile | Expo (React Native) | SwiftUI, Kotlin |
| database | Postgres on Supabase or Neon | PlanetScale, SQLite (Turso) |
| ORM | Drizzle or Prisma | raw SQL |
| auth | Supabase Auth or Auth.js | Clerk |
| payments | Stripe Checkout + Billing | Lemon Squeezy, Paddle |
| Resend or Postmark | SES | |
| jobs | Vercel Cron, Inngest or Trigger.dev | a worker on Fly |
| files | Supabase Storage or Cloudflare R2 | S3 |
| hosting | Vercel | Netlify, Fly, Render |
Write each choice with one line of why. One database. No microservices. The clone does not need the original's architecture, it needs the original's features.
Turn the inferred data model into SQL. For every table:
id uuid primary key default gen_random_uuid(), created_at, updated_atuser_id or org_id) on everything a user ownson delete rule decided, not defaultedtimestamptz, always, stored in UTCExample, for a booking app:
create table bookings (
id uuid primary key default gen_random_uuid(),
event_type_id uuid not null references event_types(id) on delete cascade,
host_id uuid not null references users(id) on delete cascade,
start_at timestamptz not null,
end_at timestamptz not null,
guest_name text not null,
guest_email text not null,
guest_timezone text not null,
status text not null default 'confirmed'
check (status in ('confirmed','cancelled','rescheduled')),
answers jsonb not null default '{}',
created_at timestamptz not null default now(),
constraint no_zero_length check (end_at > start_at)
);
create index on bookings (host_id, start_at);
Then the hard constraints the recon found. Two guests booking the same slot is a database problem (an exclusion constraint or a unique index), not a UI problem.
One table per flow from the recon map. For every route or server action:
method path | what it does | who can call it | input | output | flow
Plus webhooks in (Stripe, calendar providers) and out, and background jobs (reminders, sync, cleanup) with their schedule.
Only official, public APIs with the user's own keys. Never the original app's private endpoints, even if they are visible in a browser.
Write a line on each that applies: time zones and daylight saving, idempotency (webhooks arrive twice), race conditions, rate limits, file size limits, search, realtime, offline, email deliverability, multi-tenancy, GDPR deletion.
features.csv, by area.Each milestone lists its screens (S-IDs), tables and routes.
replica/architecture.md, the SQL in replica/schema.sql or as the first
migration, and a summary: stack in one line, table count, route count, the
three riskiest parts, and the next step: /replica-design.
name: replica-architect description: >- Plans the stack, database schema and API for an app clone, from the recon map replica-recon wrote. Picks boring, managed tech, turns the inferred data model into real SQL with indexes and access rules, lists every route by flow, and orders the build as a thin vertical slice first. Use when the user says "plan the clone", "what stack should I use", "design the database", "write the schema", "plan the API", "architecture for my version of X", or after /replica-recon finishes.
---
name: replica-architect
description: >-
Plans the stack, database schema and API for an app clone, from the recon
map replica-recon wrote. Picks boring, managed tech, turns the inferred data
model into real SQL with indexes and access rules, lists every route by
flow, and orders the build as a thin vertical slice first. Use when the user
says "plan the clone", "what stack should I use", "design the database",
"write the schema", "plan the API", "architecture for my version of X", or
after /replica-recon finishes.
---
# replica-architect
Reads `replica/recon.md` and `replica/features.csv`. Writes
`replica/architecture.md` (template: architecture.md in this folder).
If there is no recon map, stop and run `/replica-recon` first. Planning a
clone from memory of what an app does is how you miss half of it.
## Step 1: the stack
Use what the user already knows if they have a stack. Otherwise the default,
because every part is managed, documented and cheap at zero users:
| layer | default | swap for |
| --- | --- | --- |
| web app | Next.js (App Router) + TypeScript | Remix, SvelteKit, Rails |
| styling | Tailwind, tokens from replica-design | CSS modules |
| mobile | Expo (React Native) | SwiftUI, Kotlin |
| database | Postgres on Supabase or Neon | PlanetScale, SQLite (Turso) |
| ORM | Drizzle or Prisma | raw SQL |
| auth | Supabase Auth or Auth.js | Clerk |
| payments | Stripe Checkout + Billing | Lemon Squeezy, Paddle |
| email | Resend or Postmark | SES |
| jobs | Vercel Cron, Inngest or Trigger.dev | a worker on Fly |
| files | Supabase Storage or Cloudflare R2 | S3 |
| hosting | Vercel | Netlify, Fly, Render |
Write each choice with one line of why. One database. No microservices. The
clone does not need the original's architecture, it needs the original's
features.
## Step 2: the schema
Turn the inferred data model into SQL. For every table:
- `id uuid primary key default gen_random_uuid()`, `created_at`, `updated_at`
- an owner column (`user_id` or `org_id`) on everything a user owns
- foreign keys with an `on delete` rule decided, not defaulted
- indexes on every foreign key and every column you filter or sort by
- enums or check constraints for status fields
- times as `timestamptz`, always, stored in UTC
- money as integer cents plus a currency column
- access rules: Postgres row level security on Supabase, or one
authorisation check per query in the data layer. Write which.
Example, for a booking app:
```sql
create table bookings (
id uuid primary key default gen_random_uuid(),
event_type_id uuid not null references event_types(id) on delete cascade,
host_id uuid not null references users(id) on delete cascade,
start_at timestamptz not null,
end_at timestamptz not null,
guest_name text not null,
guest_email text not null,
guest_timezone text not null,
status text not null default 'confirmed'
check (status in ('confirmed','cancelled','rescheduled')),
answers jsonb not null default '{}',
created_at timestamptz not null default now(),
constraint no_zero_length check (end_at > start_at)
);
create index on bookings (host_id, start_at);
```
Then the hard constraints the recon found. Two guests booking the same slot
is a database problem (an exclusion constraint or a unique index), not a UI
problem.
## Step 3: the API
One table per flow from the recon map. For every route or server action:
`method path | what it does | who can call it | input | output | flow`
Plus webhooks in (Stripe, calendar providers) and out, and background jobs
(reminders, sync, cleanup) with their schedule.
Only official, public APIs with the user's own keys. Never the original app's
private endpoints, even if they are visible in a browser.
## Step 4: the parts that bite
Write a line on each that applies: time zones and daylight saving, idempotency
(webhooks arrive twice), race conditions, rate limits, file size limits,
search, realtime, offline, email deliverability, multi-tenancy, GDPR deletion.
## Step 5: build order
1. **Vertical slice.** The core loop end to end, ugly: sign up, do the one
thing, see the result. Proves the stack.
2. **Must-haves** from `features.csv`, by area.
3. **Should-haves**, then could-haves.
4. **The fixes** replica-entrepreneur finds, once it has run.
Each milestone lists its screens (S-IDs), tables and routes.
## Output
`replica/architecture.md`, the SQL in `replica/schema.sql` or as the first
migration, and a summary: stack in one line, table count, route count, the
three riskiest parts, and the next step: `/replica-design`.
Free to get does not mean free to run. Price labels are not safety ratings. Submit pricing information →
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
Version reported in registry metadata; check source releases before relying on it.
Quality
60/100
Promising
Trust
60/100
Sandbox only
Audit
74/100
Risky
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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}Listing source
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