# Startpacks

> Skills, rules, definitions, starter agents and single prompts that make AI coding agents work test-first in your engine, stack or project type. Free packs, cheap prompts and bundles.

Operated by XBU AB. Full catalog: https://startpacks.dev/packs

## Website types

Agent packs for blogs, shops, SaaS landing pages, docs sites and more.

- [Blog / content site with SEO (Astro)](https://startpacks.dev/packs/website-blog-content-seo): AI coding-agent instructions for: Content sites: typed content collections, editorial workflow, technical SEO and internal linking, built with Astro. ($14)
- [Booking and appointment-scheduling website](https://startpacks.dev/packs/website-booking-scheduling): AI coding-agent instructions for: Websites where visitors book time slots (clinics, studios, tutors, rentals): time-zone-safe availability, database-enforced no-double-booking,… ($14)
- [Community forum / discussion site](https://startpacks.dev/packs/website-community-forum): AI coding-agent instructions for: Building or configuring a community forum: data model, moderation and safety, spam control, notifications and privacy. ($14)
- [Directory / listings website](https://startpacks.dev/packs/website-directory-listings): AI coding-agent instructions for: Directories and listing sites (businesses, tools, jobs, venues): listing data model, search and filters, programmatic SEO with a quality gate,… ($14)
- [Documentation site (Astro Starlight)](https://startpacks.dev/packs/website-docs-site): AI coding-agent instructions for: Product or library documentation sites with a clear structure (tutorial, how-to, reference, explanation), checked links and CI builds. ($14)
- [E-commerce site with Stripe Checkout](https://startpacks.dev/packs/website-ecommerce-stripe): AI coding-agent instructions for: Small online shops (physical or digital goods) with a server-side catalogue, Stripe-hosted Checkout, webhook fulfilment and EU-aware checkout… ($14)
- [Marketing / landing site (Astro)](https://startpacks.dev/packs/website-marketing-landing): AI coding-agent instructions for: Fast, accessible, conversion-focused marketing and landing pages built with Astro, specified before they are built. ($14)
- [Two-sided marketplace website (buyers and sellers)](https://startpacks.dev/packs/website-marketplace-two-sided): AI coding-agent instructions for: Marketplaces where sellers list and buyers pay through your platform: roles and listings data model, Stripe Connect destination charges with a… ($14)
- [Newsletter and paid-membership website (Stripe subscriptions)](https://startpacks.dev/packs/website-newsletter-membership): AI coding-agent instructions for: Sites that grow an email list and sell paid memberships: double opt-in, Stripe subscriptions with webhook-driven access, the customer portal,… ($14)
- [Portfolio site (Astro)](https://startpacks.dev/packs/website-portfolio): AI coding-agent instructions for: Personal or studio portfolio sites that load fast, show case studies clearly and make contacting you easy and safe. ($14)
- [SaaS dashboard (Next.js App Router)](https://startpacks.dev/packs/website-saas-dashboard): AI coding-agent instructions for: Authenticated SaaS dashboards: layout, data tables, forms, roles, loading/empty/error states, tested first. ($14)

## Developer types

Packs for how you work: TDD, security review, refactoring, full-stack SaaS.

- [HTTP API backend (TypeScript)](https://startpacks.dev/packs/api-backend-typescript): AI coding-agent instructions for: Typed, tested HTTP APIs in TypeScript with Fastify, Zod validation, in-process request tests and production checklists. ($14)
- [Backend developer (Node.js + TypeScript)](https://startpacks.dev/packs/backend-node-typescript): AI coding-agent instructions for: Backend work on Node 22 + TypeScript: service layer tested without a server, one error-mapping place, validated config, idempotent writes,… ($14)
- [Command-line tool (TypeScript/Node)](https://startpacks.dev/packs/cli-tool): AI coding-agent instructions for: Well-behaved CLI tools in TypeScript: predictable flags, exit codes, JSON output, tested in-process, published to npm. ($14)
- [Data engineer (SQL and pipelines on Postgres)](https://startpacks.dev/packs/data-engineer-sql): AI coding-agent instructions for: Data work in SQL: layered schemas, constraints in the database, idempotent and incremental loads, data-quality checks as queries, performance… ($14)
- [DevOps / platform engineer (CI/CD and containers)](https://startpacks.dev/packs/devops-ci-cd): AI coding-agent instructions for: CI/CD pipelines that are fast, least-privilege and reviewable: GitHub Actions workflows with pinned actions and safe inputs, deploy approvals and… ($14)
- [Embedded developer (C/C++ firmware, host-tested)](https://startpacks.dev/packs/embedded-c-cpp): AI coding-agent instructions for: Firmware in C/C++ with a test-first workflow on the host PC: hardware behind a thin HAL, strict warnings and sanitizers, fixed-size data… ($14)
- [Frontend developer (React + TypeScript)](https://startpacks.dev/packs/frontend-react-typescript): AI coding-agent instructions for: Day-to-day frontend work in React + TypeScript with Vite: tested components by user-visible behaviour, loading/empty/error states, accessible… ($14)
- [Full-stack developer (vertical slices, contracts, release readiness)](https://startpacks.dev/packs/fullstack-developer): AI coding-agent instructions for: Shipping web features end to end: thin vertical slices, one shared contract between frontend and backend, auth/session boundaries, environment… ($14)
- [QA automation engineer (Playwright, API tests, flake control)](https://startpacks.dev/packs/qa-automation-engineer): AI coding-agent instructions for: Test automation that stays trustworthy: a test strategy, user-facing Playwright locators and web-first assertions, API-level checks, isolated… ($14)
- [Security engineer (application security checklist)](https://startpacks.dev/packs/security-engineer): AI coding-agent instructions for: Application-security work for web/API projects: threat modelling, an OWASP Top 10:2025 review, authorization (IDOR) tests, dependency and secret… ($14)
- [Supabase Vite SaaS](https://startpacks.dev/packs/supabase-vite-saas): Agent starter pack for a Supabase + Vite + Stripe SaaS (Free)

## Game engines & genres

Unreal, Unity, Godot and genre packs: platformer, roguelike, FPS, RPG and more.

- [First-person shooter](https://startpacks.dev/packs/fps-shooter): AI coding-agent instructions for: First-person shooter games: core loop, tunable data, headless balance simulation and versioned saves. ($14)
- [Godot 4 GDScript with GUT tests](https://startpacks.dev/packs/godot-gdscript): AI coding-agent instructions for: Godot 4 projects written in GDScript with test-first workflow (GUT) and headless CLI runs. ($14)
- [Multiplayer networking](https://startpacks.dev/packs/multiplayer-networking): AI coding-agent instructions for: Multiplayer networking games: core loop, tunable data, headless balance simulation and versioned saves. ($14)
- [2D platformer](https://startpacks.dev/packs/platformer-2d): AI coding-agent instructions for: 2D platformer games: core loop, tunable data, headless balance simulation and versioned saves. ($14)
- [Puzzle game](https://startpacks.dev/packs/puzzle): AI coding-agent instructions for: Puzzle game games: core loop, tunable data, headless balance simulation and versioned saves. ($14)
- [Roguelike / roguelite](https://startpacks.dev/packs/roguelike): AI coding-agent instructions for: Roguelike / roguelite games: core loop, tunable data, headless balance simulation and versioned saves. ($14)
- [RPG with quests and progression](https://startpacks.dev/packs/rpg-quest-systems): AI coding-agent instructions for: RPG with quests and progression games: core loop, tunable data, headless balance simulation and versioned saves. ($14)
- [Strategy / RTS](https://startpacks.dev/packs/strategy-rts): AI coding-agent instructions for: Strategy / RTS games: core loop, tunable data, headless balance simulation and versioned saves. ($14)
- [Survival / crafting](https://startpacks.dev/packs/survival-crafting): AI coding-agent instructions for: Survival / crafting games: core loop, tunable data, headless balance simulation and versioned saves. ($14)
- [Unity C# with TDD (Unity Test Framework)](https://startpacks.dev/packs/unity-csharp-tdd): AI coding-agent instructions for: Unity projects written test-first in C# with the Unity Test Framework (Edit Mode + Play Mode, NUnit). ($14)
- [Unreal C++ TDD](https://startpacks.dev/packs/unreal-cpp-tdd): Unreal C++ TDD: AGENTS.md, CLAUDE.md, 4 Cursor rules, 7 skills and templates for AI coding agents. (Free)

## App types

iOS, Android, Flutter, Expo, Tauri and other app starters for agents.

- [Android app with Kotlin and Jetpack Compose](https://startpacks.dev/packs/android-kotlin-compose): AI coding-agent instructions for: Android apps in Kotlin + Jetpack Compose, test-first with JUnit/Compose tests, plus a Google Play release checklist. ($14)
- [Desktop app with Tauri 2](https://startpacks.dev/packs/desktop-tauri): AI coding-agent instructions for: Cross-platform desktop apps with Tauri 2 (Rust core + web frontend), with logic in a testable Rust crate and least-privilege permissions. ($14)
- [Flutter app with Dart](https://startpacks.dev/packs/flutter-dart): AI coding-agent instructions for: Flutter apps (iOS, Android, web, desktop) built test-first with unit and widget tests, plus store release steps. ($14)
- [iOS app with Swift and SwiftUI](https://startpacks.dev/packs/ios-swift-swiftui): AI coding-agent instructions for: iOS apps in Swift + SwiftUI, test-first, with logic in a Swift Package and an App Store release checklist. ($14)
- [Mobile developer (generalist: choosing and shipping)](https://startpacks.dev/packs/mobile-developer-generalist): AI coding-agent instructions for: Cross-cutting mobile practice for any stack: choosing native vs cross-platform vs PWA, offline-first data, permissions and privacy, secure… ($14)
- [Progressive Web App with Vite and TypeScript](https://startpacks.dev/packs/pwa-vite-typescript): AI coding-agent instructions for: Installable, offline-capable web apps with Vite, React/TypeScript, vite-plugin-pwa and Vitest. (Free)
- [React Native (Expo) with Supabase](https://startpacks.dev/packs/react-native-expo-supabase): AI coding-agent instructions for: Cross-platform mobile apps with Expo (React Native, TypeScript), Expo Router and Supabase auth/data, tested with jest-expo. ($14)

## Starter agents

Ready-made agent roles: test-first engineer, PR reviewer, release manager, QA tester.

- [AI / agent engineer (LLM apps, evals, MCP)](https://startpacks.dev/packs/ai-agent-engineer): AI coding-agent instructions for: Building LLM-powered features and agents in TypeScript: a swappable model interface with deterministic fakes, budgeted agent loops, human… ($19)
- [Daily Briefing](https://startpacks.dev/packs/daily-briefing): A briefing agent that collects what matters for one person's projects every weekday morning and delivers one short, scannable message — silent when nothing changed. ($19)
- [Docs Writer](https://startpacks.dev/packs/docs-writer): A documentation agent that reads your code and writes accurate, tested docs organised by type (tutorial, how-to, reference, explanation). ($19)
- [Game Designer Assistant (GDD and balance)](https://startpacks.dev/packs/game-designer-assistant): A design assistant for indie developers: turns ideas into one-page GDDs, defines core loops, systems and balance tables, and checks numbers with small simulations. ($19)
- [Indie Marketer](https://startpacks.dev/packs/indie-marketer): A marketing assistant for solo developers: positions a product, plans small launches and drafts posts and store text — everything stays a draft until you approve it. ($19)
- [Pull Request Reviewer](https://startpacks.dev/packs/pr-reviewer): A review agent that reads a diff, checks it against the repo's rules and tests, and returns a short prioritised review — it never approves, merges or pushes. (Free)
- [QA Tester](https://startpacks.dev/packs/qa-tester): A testing agent that turns a feature or bug report into a test plan, runs it, and returns reproducible findings — it reports bugs, it doesn't hide them. ($19)
- [Release Manager](https://startpacks.dev/packs/release-manager): A release agent that prepares versions, changelogs and checklists and tracks readiness — and never tags, publishes or deploys without an explicit go. ($19)
- [Research Scout](https://startpacks.dev/packs/research-scout): A research agent that answers one question at a time with sources, confidence levels and clearly marked unknowns — no vibes, no invented citations. ($19)
- [Support Triage](https://startpacks.dev/packs/support-triage): A support agent that sorts incoming requests, finds known answers, drafts replies and escalates what needs a human — nothing is sent without approval. ($19)
- [Test-First Engineer](https://startpacks.dev/packs/test-first-engineer): A coding agent that does one job: turn a small, clear task into a verified change using red-green-refactor, and report only with evidence. (Free)

## Single prompts

One self-contained prompt for one specific job, at a low price.

- [Onboarding flow design](https://startpacks.dev/packs/app-onboarding-flow): Design a first-run flow that gets a user to their first success quickly. ($4)
- [App release checklist](https://startpacks.dev/packs/app-release-checklist): Generate a release checklist for a mobile or web app with evidence per item. ($4)
- [App store listing](https://startpacks.dev/packs/app-store-listing): Write store listing text and a screenshot plan for iOS/Android. ($4)
- [Competitor teardown](https://startpacks.dev/packs/biz-competitor-teardown): Compare competitors from public information you supply and find a gap. ($4)
- [Customer interview script](https://startpacks.dev/packs/biz-customer-interview-script): Prepare problem-discovery interviews that avoid leading questions. ($4)
- [Small launch plan](https://startpacks.dev/packs/biz-launch-plan): Plan a realistic 4-week launch for a solo or tiny team. ($4)
- [Stripe pricing experiment](https://startpacks.dev/packs/biz-stripe-pricing-experiment): Plan a pricing test you can run with Stripe Payment Links or Checkout. ($4)
- [API design review and draft](https://startpacks.dev/packs/dev-api-design): Design or review an HTTP API: resources, errors, pagination, versioning. ($4)
- [Bug triage and reproduction plan](https://startpacks.dev/packs/dev-bug-triage): Turn a vague bug report into severity, a minimal reproduction and next steps. ($4)
- [Code review of a diff](https://startpacks.dev/packs/dev-code-review): Get a prioritised, evidence-based review of a diff. (Free)
- [Commit message and PR description](https://startpacks.dev/packs/dev-commit-pr-description): Write a clear commit message and PR description from a diff. ($4)
- [Dependency upgrade plan](https://startpacks.dev/packs/dev-dependency-upgrade-plan): Plan a safe major-version dependency upgrade. ($4)
- [Migration plan (code, framework or database)](https://startpacks.dev/packs/dev-migration-plan): Plan a safe, incremental migration with rollback. ($4)
- [Performance investigation plan](https://startpacks.dev/packs/dev-performance-profiling): Find and fix a performance problem by measuring first. ($4)
- [README writer](https://startpacks.dev/packs/dev-readme-writer): Write a README that gets a new user to a working result. ($4)
- [Refactor safely](https://startpacks.dev/packs/dev-refactor-safely): Plan and perform a behaviour-preserving refactor with tests as the safety net. ($4)
- [Security review of code or design](https://startpacks.dev/packs/dev-security-review): Find likely vulnerabilities and rank fixes for a component. ($4)
- [Write the failing test first](https://startpacks.dev/packs/dev-write-failing-test-first): Turn a behaviour description into one failing test and the minimal code to pass it. (Free)
- [Balance pass](https://startpacks.dev/packs/game-balance-pass): Check and tune a table of numbers with formulas and a simulation plan. ($4)
- [Core loop design](https://startpacks.dev/packs/game-core-loop-design): Define the core loop, verbs, timing and failure/reward structure for a game idea. ($4)
- [Game feel polish checklist](https://startpacks.dev/packs/game-feel-polish-checklist): Review a prototype for responsiveness and feedback and list prioritised polish tasks. ($4)
- [GDD one-pager](https://startpacks.dev/packs/game-gdd-one-pager): Turn rough notes into a one-page game design document. ($4)
- [Level design brief](https://startpacks.dev/packs/game-level-design-brief): Write a brief for one level: purpose, teaching goals, beats, pacing and validation. ($4)
- [Playtest plan and questions](https://startpacks.dev/packs/game-playtest-plan): Plan a small playtest that can disprove a design hypothesis. ($4)
- [Quest generator](https://startpacks.dev/packs/game-quest-generator): Generate varied, data-ready quest definitions for an RPG with validation notes. ($4)
- [Accessibility audit](https://startpacks.dev/packs/web-accessibility-audit): Review HTML/UI against WCAG 2.2 AA and produce fixes. ($4)
- [Blog post brief](https://startpacks.dev/packs/web-blog-post-brief): Create a brief and outline for an SEO-aware, genuinely useful post. ($4)
- [Landing page copy and structure](https://startpacks.dev/packs/web-landing-page-copy-structure): Write the structure and copy for one landing page with one goal. ($4)
- [Pricing page design](https://startpacks.dev/packs/web-pricing-page): Design pricing tiers and page copy for a software product. ($4)
- [SEO audit of a page or site](https://startpacks.dev/packs/web-seo-audit): Audit on-page and technical SEO from HTML or a URL's content you provide. ($4)

## Bundles

Collections of packs at a discount: all game packs, all website packs and more.

- [All game engine & genre packs](https://startpacks.dev/packs/bundle-all-game-packs): Every game engine and genre pack in one bundle. ($39)
- [All website type packs](https://startpacks.dev/packs/bundle-all-website-packs): Every website type pack in one bundle. ($39)
- [All app type packs](https://startpacks.dev/packs/bundle-all-app-packs): iOS, Android, Flutter, Expo, Tauri and more in one bundle. ($39)
- [All developer type packs](https://startpacks.dev/packs/bundle-all-developer-packs): Every developer-workflow pack in one bundle. ($39)
- [All starter agents](https://startpacks.dev/packs/bundle-all-starter-agents): Every starter agent role in one bundle. ($39)
- [Single prompt library](https://startpacks.dev/packs/bundle-prompt-library): Every single prompt at a bundle discount. ($19)

## Legal

- [Terms of sale](https://startpacks.dev/terms)
- [Privacy](https://startpacks.dev/privacy)
- [Refunds and withdrawal](https://startpacks.dev/refunds)