What is Third-Person-MC AGENTS.md?

A development guide for AI coding agents working on a web project that uses pnpm, Playwright, and a JavaScript-based build system.

Use it to run the development server, production build, lint checks, browser tests in Chromium, Firefox, or Safari, and individual Playwright tests.

It tells an agent which commands and package manager to use, reducing mistakes when building, linting, testing, or cleaning the project.

How hexianWeb/Third-Person-MC configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to hexianWeb/Third-Person-MC. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/hexianWeb/Third-Person-MC/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/hexianWeb/Third-Person-MC

Made for: Codex, OpenCode.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/hexianweb/third-person-mc/agents-md/github.svg)](https://agentmods.dev/instructions/hexianweb/third-person-mc/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/hexianweb/third-person-mc/agents-md"><img src="https://agentmods.dev/badge/instructions/hexianweb/third-person-mc/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/hexianweb/third-person-mc/agents-md"><img src="https://agentmods.dev/badge/instructions/hexianweb/third-person-mc/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,908 This file is loaded in full into every session.

When invoked 2,908 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found 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.

Model	Per session	Once invoked
Fable 5.1	$0.02908	$0.02908
Opus 5.5	$0.01163	$0.01163
Sonnet 5.5	$0.00582	$0.00582
Haiku 4.5	$0.00291	$0.00291

Measured 2mo ago against content hash 6134caa224cb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Third-Person-MC AGENTS.md 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 2mo 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.

AGENTS.md · 412 lines

How it starts

The opening of the file, as written. The whole thing — 412 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md - Development Guide for AI Coding Agents

This document provides essential information for AI coding agents working in this repository.

Build, Lint, and Test Commands

Package Manager

This project uses pnpm. Always use pnpm instead of npm or yarn.

Development

pnpm dev              # Start development server with hot reload
pnpm build            # Build for production
pnpm preview          # Preview production build locally

Linting

pnpm lint             # Check code for linting errors
pnpm lint:fix         # Auto-fix linting issues

Testing

# E2E tests with Playwright (located in tests/ directory)
pnpm test:chrome      # Run tests in Chromium (headed mode)
pnpm test:firefox     # Run tests in Firefox (headed mode)
pnpm test:safari      # Run tests in WebKit/Safari (headed mode)

Running a single test:

npx playwright test tests/browsers.test.js --headed --project=chromium
npx playwright test tests/browsers.test.js:10 --headed  # Run specific line

Cleanup

pnpm clean:dist       # Remove dist directory
pnpm clean:report     # Remove Playwright test reports

Code Style Guidelines

Language & Modules

Pure JavaScript (no TypeScript) with ES modules ("type": "module")
Use .js extensions explicitly in imports
Use JSDoc comments for type hints where beneficial

Formatting (ESLint - Antfu)

Style Guide: Follows @antfu/eslint-config defaults
Print width: 120 characters
Indentation: 2 spaces (no tabs)
Semicolons: None (Never use semicolons)
Quotes: Single quotes (') for JS/Vue, single for JSX
Trailing commas: All (Multi-line objects/arrays)
Arrow parens: Always
Line endings: CRLF (Windows)
Plugins: prettier-plugin-tailwindcss for class sorting

CRITICAL FORMATTING RULES:

Respect Existing Style: When modifying a file, mimic the existing formatting (braces, blank lines, sorting) exactly.
Vue SFC: Do NOT indent top-level content inside <script setup> or <style>.
Minimal Changes: Do NOT reformat the entire file. Only apply formatting to your specific changes.
Antfu Nuances: Allow single-line if statements without braces.

Read the full file on GitHub · 412 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.

2mo ago First seen · 412 lines · 2,908 tokens per session scan A 6134caa224cb

Subscribe to this mod's changes

Third-Person-MC AGENTS.md is an instructions file published in the GitHub repository hexianWeb/Third-Person-MC (197 stars, last pushed 3mo ago), licensed MIT. It adds 2,908 tokens to every session, about $0.0116 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

3d-game browser-game game javascript js

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 9,715 tokens

Third-Person-MC: Instructions file for Codex