Free prompt and AI coding rules templates

Copy-paste rules files and prompts for vibe coders, AI agent builders and indie game developers. Each template explains when to use it, which tools it works with and how to set it up. Free to copy, change and use in your own projects. No sign-up needed.

We wrote these templates from each tool's public documentation and common practice. We have not measured how they perform, so treat them as a solid starting point and adapt them to your project.

Rules fileVibe coding

Cursor rules for a Next.js + Tailwind landing page

A project rule that keeps an AI agent building a fast, accessible, mobile-first Next.js + Tailwind CSS landing page instead of an over-engineered one.

Free · Works with Cursor

Rules fileGame devVibe coding

Cursor and Claude Code rules for a small browser game (HTML5 canvas or Phaser)

Rules that keep a 2D browser game playable after every AI change: delta-time game loop, input mapping, object pooling, tunable config and small, testable steps.

Free · Works with Cursor, Claude Code, Rosebud AI

Agent instructionsVibe coding

AGENTS.md and CLAUDE.md starter for a solo vibe-coded project

A fill-in-the-blanks instructions file that tells AI coding agents how your project runs, how to test it, which conventions to follow and what they must never do.

A

Free · Works with Cursor, Claude Code, OpenAI Codex, Aider

PromptVibe coding

Rescue prompt: diagnose and fix a project an AI agent broke

A step-by-step prompt that makes an AI agent save your current state, map what changed, find the root cause and fix it with the smallest change, instead of rewriting everything.

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Free · Works with Cursor, Claude Code, Cline, Aider and more

Prompt packVibe codingAI agents

Prompt pack: plan a feature before coding (spec, tasks, acceptance tests)

Three prompts that turn a rough feature idea into a one-page spec, a list of small ordered tasks and failing acceptance tests before the agent writes any code.

Free · Works with Cursor, Claude Code, OpenAI Codex, Cline and more

Prompt packGame devWriting

Prompt pack: Steam and itch.io store page copy for an indie game

Five prompts that turn a short game brief into positioning lines, a Steam short description, an About This Game section, an itch.io page and a final honesty check.

Free · Works with ChatGPT, Claude, Google Gemini

PromptAI agents

Prompt: build a simple AI agent with tool calls (framework-agnostic)

A build prompt for a small, readable agent loop with a tool registry, argument validation, step limits, confirmation before risky actions, logging and offline tests.

Free · Works with Claude Code, Cursor, OpenAI Codex, LangGraph and more

PromptVibe coding

Prompt: review AI-written code changes before you commit

A code review checklist prompt that catches scope creep, invented APIs, security problems, weakened tests and leftovers in an AI agent's diff before you commit.

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Free · Works with Claude Code, Cursor, OpenAI Codex, Aider and more

Templates by scenario

• Best AI for vibe coding: Cursor rules for a Next.js + Tailwind landing page · Cursor and Claude Code rules for a small browser game (HTML5 canvas or Phaser) · AGENTS.md and CLAUDE.md starter for a solo vibe-coded project · Rescue prompt: diagnose and fix a project an AI agent broke · Prompt pack: plan a feature before coding (spec, tasks, acceptance tests) · Prompt: review AI-written code changes before you commit
• Best AI tools for game development: Cursor and Claude Code rules for a small browser game (HTML5 canvas or Phaser) · Prompt pack: Steam and itch.io store page copy for an indie game
• Best AI agents for automation: Prompt pack: plan a feature before coding (spec, tasks, acceptance tests) · Prompt: build a simple AI agent with tool calls (framework-agnostic)
• Best AI for writing: Prompt pack: Steam and itch.io store page copy for an indie game

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