multifile

Project-wide instructions for developing PromptScript, a TypeScript language and toolchain that turns instruction files into formats for AI coding assistants. The project is a monorepo, meaning one repository containing several related packages.

In plain words
What is it for?
Use them when changing PromptScript's parser, resolver, validator, compiler, formatters, command-line tool, or shared core packages.
Why use it?
They give contributors shared rules for architecture, libraries, code style, and testing across the whole codebase.

Cursor rule

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/mrwogu/promptscript/multifile
Clone the repo
git clone --depth 1 https://github.com/mrwogu/promptscript
Per session 1,005 This file is loaded in full into every session.
When invoked 1,005 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.01005 $0.01005
Opus 5 $0.00502 $0.00502
Sonnet 5 $0.00201 $0.00201
Haiku 4.5 $0.00101 $0.00101

Measured 2d ago against content hash 50da8344d8c5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

multifile scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

100% identical to modern — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

packages/formatters/src/__tests__/__golden__/cursor/multifile.mdc · 140 lines

How it starts

The opening of the file, as written. The whole thing — 140 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are an expert TypeScript developer working on PromptScript - a language and toolchain for standardizing AI instructions across enterprise organizations.

PromptScript compiles .prs files to native formats for GitHub Copilot, Claude Code, Cursor, and other AI tools.

You write clean, type-safe, and well-tested code following strict TypeScript practices.

Tech stack: typescript, Node.js 20+, Nx, pnpm workspaces

Architecture

The project is organized as a monorepo with these packages:

flowchart TB
  subgraph packages
    core[core - Types, errors, utilities]
    parser[parser - Chevrotain-based parser]
    resolver[resolver - Inheritance & import resolution]
    validator[validator - AST validation rules]
    compiler[compiler - Pipeline orchestration]
    formatters[formatters - Output formatters]
    cli[cli - Command-line interface]
  end

  cli --> compiler
  compiler --> parser
  compiler --> resolver
  compiler --> validator
  compiler --> formatters
  parser --> core
  resolver --> core
  validator --> core
  formatters --> core

Key Libraries

  • Parser: Chevrotain
  • CLI: Commander.js
  • Testing: Vitest
  • Linting: ESLint + Prettier

Code style:

  • Strict mode enabled
  • Never use any type - use unknown with type guards
  • Prefer interface for object shapes
  • Use type for unions and intersections
  • Named exports only, no default exports
  • Explicit return types on public functions
  • Files: kebab-case.ts
  • Classes/Interfaces: PascalCase
  • Functions/Variables: camelCase
  • Constants: UPPER_SNAKE_CASE
  • Use custom error classes extending PSError
  • Always include location information
  • Provide actionable error messages
  • Test files: *.spec.ts next to source
  • Follow AAA (Arrange, Act, Assert) pattern
  • Target >90% coverage for libraries
  • Use fixtures for parser tests
  • Framework: vitest

Git Commits:

  • format: Conventional Commits
  • reference: https://www.conventionalcommits.org/
  • maxSubjectLength: 70
  • types: feat, fix, docs, style, refactor, test, chore
  • example: feat(parser): add support for multiline strings

Read the full file on GitHub · 140 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 140 lines · 1,005 tokens per session scan A 50da8344d8c5

Subscribe to this mod's changes

multifile is a cursor rule published in the GitHub repository mrwogu/promptscript (391 stars, last pushed 7d ago), licensed MIT. It adds 1,005 tokens to every session, about $0.0050 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to modern, differing in 0 lines, and is treated as a copy.