noeta: Instructions file for Codex

AGENTS.md

noeta AGENTS.md is an instructions file for Codex, OpenCode from initxy/noeta. It costs 1,870 tokens per session, scanned A, original, Apache-2.0.

A set of project instructions for initxy/noeta that defines communication style, language rules, workflow, context records, and engineering constraints.

In plain words
What is it for?
It guides documentation, code naming, architecture terms, handoffs, and the use of context and architecture-decision records.
Why use it?
It gives coding agents consistent rules for writing repository content and handling technical decisions when working on the project.

Instructions file for CodexOpenCode

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

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

Reuse

Borrowing it

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

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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Per session 1,870 This file is loaded in full into every session.
When invoked 1,870 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 $0.01870 $0.01870
Opus 5.5 $0.00748 $0.00748
Sonnet 5.5 $0.00374 $0.00374
Haiku 4.5 $0.00187 $0.00187

Measured 2d ago against content hash 39146259887d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

noeta 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 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.

AGENTS.md · 80 lines

How it starts

The opening of the file, as written. The whole thing — 80 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Communication

  • Keep answers concise and direct; lead with the conclusion and the next step.
  • Don't add unrelated explanation; when unsure, state your assumptions and the risks.
  • Don't narrate what you're about to do or recap what you just did; report only what changes what the reader does next.
  • Conversation may happen in whatever language the other side uses; everything committed to the repo (see Language) is English.

Language

  • All repository artifacts are written in English: docs (CONTEXT.md, docs/adr/, docs/specs/), code comments, and identifiers. The only exceptions are the Chinese mirrors — README.zh-CN.md, docs/zh/**, docs/releasing.zh.md.
  • Keep technical terms in their canonical English form and spell them consistently throughout: code identifiers (function / class / file / variable names), API / library / tool / command names, file paths, and fixed architecture terms (module, interface, seam, adapter, deep module, etc.). Don't invent alternate names or switch between synonyms.
  • Write clear, idiomatic English prose — not word-for-word translation from another language.
  • Pick one spelling per term and use it everywhere; don't mix variants.
  • Naming is enforced by scripts/lint-naming.py (in make check); the banned names and the canonical Task / root_task_id are in CONTEXT.md's Naming: entries.

Context / ADR

  • Read CONTEXT.md first whenever you touch domain concepts, system boundaries, or stable conventions. A package with its own AGENTS.md keeps its module-only concepts there.
  • Read docs/adr/ (start at docs/adr/index.md) first whenever a long-term architecture trade-off is involved; never rely on an ADR marked superseded, and read the ADRs listed under its Refined by.
  • Code is the single source of truth for "what is." When docs and code disagree, trust the code and fix the docs.
  • One fact, one home: never state the same fact in two docs — link instead. A change that invalidates a CONTEXT.md entry or ADR updates it in the same task.
  • Write docs lean: a CONTEXT.md or AGENTS.md line exists only if code can't tell an agent the same thing quickly; point at code by repo path instead of restating it. An ADR only for a shipped decision that is costly to reverse; changing one is a new ADR that refines or supersedes it, never an amendment in place. scripts/check-docs.sh holds the budgets and formats — trim, don't raise them. When unsure, don't write it.
  • Code comments carry only constraints the code can't show — never a docs/specs/ reference (one-shot artifacts). Code needn't cite ADRs; where a comment names one it is plain prose, not a contract (docs/adr/006-doc-code-link-direction.md).
  • Archived specs (docs/specs/archive/) are construction history — never read them as a description of the current system.

Read the full file on GitHub · 80 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 Changed · +1 lines · +57 tokens per session 39146259887d
  2. 3d ago Changed · +36 lines · +858 tokens per session ece4447a4158
  3. 1mo ago Changed · -3 tokens per session 2d1e828d79d8
  4. 1mo ago Changed · +30 tokens per session 2706691f119b
  5. 2mo ago First seen · 43 lines · 928 tokens per session scan A 6f0825cacb3c

Subscribe to this mod's changes

noeta AGENTS.md is an instructions file published in the GitHub repository initxy/noeta (10 stars, last pushed 3d ago), licensed Apache-2.0. It adds 1,870 tokens to every session, about $0.0075 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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