Build packs an agent can actually finish.
Complete PRD, architecture decisions, task graph, and acceptance tests -- feed it to your own agent and it builds the complex, universal part of your product. Every pack's receipt proves the destination exists before you spend a weekend and $150 finding out it doesn't.
App Store Machinery
complex-universalStoreKit 2 IAP with server-side JWS validation, fastlane + TestFlight pipeline, privacy manifest, and a review-rejection preflight — the complete shipping rig for an existing iOS app.
Verification pending
$129
Transactional Email Deliverability Core
complex-universalProduction transactional email machinery for a Next.js app: Resend integration behind a provider seam, local suppression list with correct bounce/complaint semantics, signature-verified webhooks, a domain warmup governor, staged DKIM/SPF/DMARC rollout with an automated DNS checker, and a template preview/test harness — with the tests already written.
Verification pending
$79
Multi-Tenant Auth & RBAC Core
complex-universalOrgs, invites, roles, sessions, and Postgres-RLS tenant isolation — the auth spine of a B2B SaaS, with cross-tenant isolation proven by the verify suite.
Verification pending
$149
Offline Sync Engine
complex-universalLocal-first app core — client store, sync protocol, per-field LWW conflict resolution, offline queue, and a schema-migration story that survives queued mutations — an agent-executable blueprint with a runnable convergence proof.
Verification pending
$99
SaaS Billing + Tax Core
complex-universalProduction Stripe Billing core for a seat-based SaaS — plans, seats, proration, dunning, idempotent webhooks, Stripe Tax, invoices, customer portal — as a receipt-backed build pack for your own coding agent.
Verification pending
$149