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Front-End-Checklist: Instructions file for Codex

AGENTS.md

Front-End-Checklist AGENTS.md is an instructions file for Codex, OpenCode from thedaviddias/Front-End-Checklist. It costs 4,957 tokens per session, scanned A, original, MIT.

Project instructions for Front-End-Checklist, a reference project for checking common website interface details. They explain its front-end checklist, repository layout, MCP tools, and rules for MDX files.

In plain words
What is it for?
Use them when editing Front-End-Checklist, its monorepo, MCP setup, or MDX files.
Why use it?
They give coding agents the local conventions needed to make changes that fit the project's structure and documentation format.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions AGENTS.md.

This is thedaviddias/Front-End-Checklist's own configuration. It tells Codex and OpenCode how to work on Front-End-Checklist itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything Front-End-Checklist configures →

not rated 75krepo +50 changed 1mo ago A scan 4,957 tokens original MIT
View source ↗ thedaviddias/Front-End-Checklist frontendchecklist.io
About the project

Front-End Checklist is a collection of front-end web development rules organized as a practical review and quality workflow for people and AI agents. Developers use it to audit projects and pull requests, check implementation details, and find guidance for remediation and verification. The catalogue entries provide skills, instructions, MCP tools, and a plugin for using the checklist in agent workflows.

thedaviddias/Front-End-Checklist · 74,658 stars · on GitHub · frontendchecklist.io

Reuse

Borrowing it

Nothing to install: this file belongs to thedaviddias/Front-End-Checklist. 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/thedaviddias/Front-End-Checklist/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist

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.

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README.md
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Your own site
<a href="https://agentmods.dev/instructions/thedaviddias/front-end-checklist/agents-md"><img src="https://agentmods.dev/badge/instructions/thedaviddias/front-end-checklist/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.

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Your own site · 80×15
<a href="https://agentmods.dev/instructions/thedaviddias/front-end-checklist/agents-md"><img src="https://agentmods.dev/badge/instructions/thedaviddias/front-end-checklist/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 4,957 This file is loaded in full into every session.
When invoked 4,957 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.04957 $0.04957
Opus 5.5 $0.01983 $0.01983
Sonnet 5.5 $0.00991 $0.00991
Haiku 4.5 $0.00496 $0.00496

Measured 1mo ago against content hash c4bbbac4c20a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Front-End-Checklist 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 1mo 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 · 331 lines

How it starts

The opening of the file, as written. The whole thing — 331 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — Front-End Checklist

Repository rules and conventions for contributors and automation tools.

Project Overview

Front-End Checklist is an open-source monorepo providing 385 quality-gated frontend best practice rules with an MCP server for structured review workflows.

  • MCP Server: https://mcp.frontendchecklist.io (11 tools)
  • Rules: packages/content/rules/en/<category>/<slug>.mdx
  • Web App: apps/web/ (Next.js App Router)
  • MCP Package: packages/mcp/ (TypeScript)
  • Package Manager: pnpm (workspaces + Turborepo)

Work Tracking

Work in this repo is tracked in Paperclip project FEC (Front-End Checklist, id c5edfe8f-731b-43e8-b805-c52999831084). New tickets get the DAV- prefix.

MCP Usage

When working on frontend implementation, review, debugging, or audit tasks, use the Front-End Checklist MCP server when available so recommendations stay grounded in the project rule corpus.

  • Use review_code first for pasted or inspected HTML, CSS, JavaScript, TypeScript, React, or Next.js code.
  • Use search_rules before making accessibility, performance, SEO, security, image, privacy, i18n, or testing recommendations.
  • Use get_rule, check_rule, fix_rule, or explain_rule for rule-specific guidance and remediation.
  • Use get_workflow or get_checklist_rules for broad launch, accessibility, SEO, security, performance, and testing audits.
  • Use audit_url for public https:// pages.

Some clients lazy-load installed MCP tools. If the tools are not initially visible, search for or explicitly request the Front-End Checklist MCP before proceeding with frontend work.

Monorepo Structure

apps/
  web/                    # Next.js app (App Router)
packages/
  mcp/                    # MCP server implementation
  content/                # Rules MDX content + content-collections config
  auth/                   # Better-Auth + Prisma + Supabase
  design-system/          # Shared UI components
  types/                  # Shared TypeScript types
  data-layer/             # Data access layer
  schemas/                # Zod v4 schemas

Read the full file on GitHub · 331 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. 1mo ago Changed · +15 lines · +356 tokens per session c4bbbac4c20a
  2. 2mo ago First seen · 316 lines · 4,601 tokens per session scan A 3e950a69d82f

Subscribe to this mod's changes

Front-End-Checklist AGENTS.md is an instructions file published in the GitHub repository thedaviddias/Front-End-Checklist (74,658 stars, last pushed 6d ago), licensed MIT. It adds 4,957 tokens to every session, about $0.0198 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.

Frontendchecklistfront-end-developer-toolfront-end-developmentguidelinesreference
Related

Front-End-Checklist AGENTS.md compared with instructions from other repositories

Front-End-Checklist AGENTS.md next to 6 instructions from other repositories
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vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode