muxboard: Instructions file for Codex

AGENTS.md

muxboard AGENTS.md is an instructions file for Codex, OpenCode from aanari/muxboard. It costs 3,072 tokens per session, scanned A, original, Apache-2.0.

User-experience instructions for designing Muxboard interfaces. They describe how people scan screens, find their way through navigation, and make decisions when using software.

In plain words
What is it for?
Use them when designing or reviewing Muxboard layouts, navigation, headings, actions, and information hierarchy.
Why use it?
They help remove confusing labels, unnecessary steps, and dense text so users can understand what to do without stopping to study the interface.

Instructions file for CodexOpenCode

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

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

Reuse

Borrowing it

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

Made for: Codex, OpenCode.

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Per session 3,072 This file is loaded in full into every session.
When invoked 3,072 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 $0.03072 $0.03072
Opus 5.5 $0.01229 $0.01229
Sonnet 5.5 $0.00614 $0.00614
Haiku 4.5 $0.00307 $0.00307

Measured 1mo ago against content hash 1503fc441306, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

muxboard 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 · 284 lines

How it starts

The opening of the file, as written. The whole thing — 284 lines — stays where its author put it; the contents beside it link to each section on GitHub.

UX Principles: How Users Actually Behave

These principles govern how real humans interact with interfaces. They are observed behavior, not preferences. Apply them before, during, and after every design decision.

The Three Laws of Usability

  1. Don't make me think. Every page should be self-evident. If a user stops to think "What do I click?" or "What does this mean?", the design has failed. Self-evident > self-explanatory > requires explanation.

  2. Clicks don't matter, thinking does. Three mindless, unambiguous clicks beat one click that requires thought. Each step should feel like an obvious choice (animal, vegetable, or mineral), not a puzzle.

  3. Omit, then omit again. Get rid of half the words on each page, then get rid of half of what's left. Happy talk (self-congratulatory text) must die. Instructions must die. If they need reading, the design has failed.

How Users Actually Behave

  • Users scan, they don't read. Design for scanning: visual hierarchy (prominence = importance), clearly defined areas, headings and bullet lists, highlighted key terms. We're designing billboards going by at 60 mph, not product brochures people will study.
  • Users satisfice. They pick the first reasonable option, not the best. Make the right choice the most visible choice.
  • Users muddle through. They don't figure out how things work. They wing it. If they accomplish their goal by accident, they won't seek the "right" way. Once they find something that works, no matter how badly, they stick to it.
  • Users don't read instructions. They dive in. Guidance must be brief, timely, and unavoidable, or it won't be seen.

Billboard Design for Interfaces

  • Use conventions. Logo top-left, nav top/left, search = magnifying glass. Don't innovate on navigation to be clever. Innovate when you KNOW you have a better idea, otherwise use conventions. Even across languages and cultures, web conventions let people identify the logo, nav, search, and main content.
  • Visual hierarchy is everything. Related things are visually grouped. Nested things are visually contained. More important = more prominent. If everything shouts, nothing is heard. Start with the assumption everything is visual noise, guilty until proven innocent.
  • Make clickable things obviously clickable. No relying on hover states for discoverability, especially on mobile where hover doesn't exist. Shape, location, and formatting (color, underlining) must signal clickability without interaction.
  • Eliminate noise. Three sources: too many things shouting for attention (shouting), things not organized logically (disorganization), and too much stuff (clutter). Fix noise by removal, not addition.
  • Clarity trumps consistency. If making something significantly clearer requires making it slightly inconsistent, choose clarity every time.

Read the full file on GitHub · 284 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 First seen · 284 lines · 3,072 tokens per session scan A 1503fc441306

Subscribe to this mod's changes

muxboard AGENTS.md is an instructions file published in the GitHub repository aanari/muxboard (5 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 3,072 tokens to every session, about $0.0123 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 2026-08-31.

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