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formax: Instructions file for Codex

AGENTS.md

formax AGENTS.md is an instructions file for Codex, OpenCode from yusifeng/formax. It costs 3,468 tokens per session, scanned A, original, MIT.

Repository instructions for the Formax coding project. They describe where major parts of the TypeScript code live, how the project is organized, how to build and test it, and the expected coding style.

In plain words
What is it for?
Use them when working on Formax's CLI, terminal UI, runtime setup, tools, streaming code, subagents, tests, or related project structure.
Why use it?
They give contributors a reliable starting point so they can find the right files and follow the project's established development rules.

Instructions file for CodexOpenCode

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

This is yusifeng/formax's own configuration. It tells Codex and OpenCode how to work on formax 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 formax configures →

not rated 184repo +8 3mo ago A scan 3,468 tokens original MIT
View source ↗ yusifeng/formax
Reuse

Borrowing it

Nothing to install: this file belongs to yusifeng/formax. 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/yusifeng/formax/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/yusifeng/formax

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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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/yusifeng/formax/agents-md"><img src="https://agentmods.dev/badge/instructions/yusifeng/formax/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 3,468 This file is loaded in full into every session.
When invoked 3,468 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 $0.03468 $0.03468
Opus 5.5 $0.01387 $0.01387
Sonnet 5.5 $0.00694 $0.00694
Haiku 4.5 $0.00347 $0.00347

Measured 2mo ago against content hash af0ab1e324d9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

formax 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 · 177 lines

How it starts

The opening of the file, as written. The whole thing — 177 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Repository Guidelines

AGENTS Scope

  • Keep high-frequency operational guidance here (review workflow/profile, commonly used commands/scripts, commit workflow, and day-to-day guardrails).
  • Keep canonical product/runtime semantics in docs/contracts/* and related canonical docs.
  • Keep code navigation in CODEMAP.md ("where to change what"), with AGENTS linking to it instead of duplicating path-level maps.

Project Structure & Module Organization

  • packages/core/src/ contains TypeScript source.
    • entrypoints/ CLI/runtime entrypoints (for example cli.tsx).
    • runtime/cli/ argument parsing + command dispatch for the CLI wrapper.
    • runtime/bootstrap/ REPL bootstrap + runtime assembly wiring.
    • core/ productized app core (config resolution, setup flows, boundaries checks).
    • tui/ Ink “wizard” UIs (first-run setup, selectors, forms).
    • adapters/ filesystem + setup adapters (config files, setup persistence).
    • screens/ Ink screens; components/ reusable UI.
    • tools/ tool registry, modules, handlers, presenters, runtime managers.
    • streaming/ Anthropic streaming client and parsers.
    • features/subagents/ registry/runner for sub-agent tools.
    • prompts/, config/, services/, shared/utils/ supporting code.
  • packages/ contains companion workspaces. Package-local implementation details belong to each package AGENTS.md.
  • Tests live next to source as *.test.ts/*.test.tsx.
  • docs/ holds architecture notes and guides; plans/ captures refactor plans.
  • proxy/ contains proxy/logger scripts plus traffic/log artifacts used for parity/reference during development.
  • CODEMAP.md is the “where to change what” index (entrypoints, main loop, tools, plan mode, sub-tasks).

Build, Test, and Development Commands

  • bun install installs dependencies.
  • bun run dev runs the CLI via tsx (entry: packages/core/src/entrypoints/cli.tsx).
  • bun run app-server:bridge -- --host 127.0.0.1 --port 3777 runs the app-server WebSocket bridge for web client development.
  • bun run build bundles the CLI to dist/cli.js (requires Bun).
  • bun run type-check runs TypeScript checks + boundary checks (core + ui).
  • bun run check:root-script-governance enforces root package.json script governance (orchestration-only, no feature alias uplift).
  • bun run ui:boundaries runs UI boundary checks (guards packages/core/src/tui/, packages/core/src/screens/, packages/core/src/components/ from importing forbidden layers).
  • bun run test runs vitest run; bun run test:watch runs Vitest watch.
  • Single test: bun run test -- packages/core/src/tools/registry.test.ts.
  • Package-specific commands (web/desktop/shared/semantics) live in each package AGENTS.md.

Read the full file on GitHub · 177 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. 2mo ago First seen · 177 lines · 3,468 tokens per session scan A af0ab1e324d9

Subscribe to this mod's changes

formax AGENTS.md is an instructions file published in the GitHub repository yusifeng/formax (184 stars, last pushed 3mo ago), licensed MIT. It adds 3,468 tokens to every session, about $0.0139 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.

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