OpenTagViewer AGENTS.md

OpenTagViewer AGENTS.md is an instructions file for Codex, OpenCode from parawanderer/OpenTagViewer. It costs 11,046 tokens per session, scanned A, original, MIT.

A project guide for OpenTagViewer, an Android app that shows Apple AirTag locations without requiring an Apple device. It explains the app’s Java, Python, database, and asynchronous-processing components.

In plain words
What is it for?
Use it when changing the Android interface, Room database, Apple Find My integration, embedded Python code, asynchronous services, or desktop export tools.
Why use it?
It documents important boundaries and upgrade rules, such as keeping database changes compatible and Python code independent from Android types.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: reads .claude/ paths; mentions AGENTS.md.

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add instructions/parawanderer/opentagviewer/agents-md
Clone the repo
git clone --depth 1 https://github.com/parawanderer/OpenTagViewer

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.

agentmods badge for OpenTagViewer AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/parawanderer/opentagviewer/agents-md.svg)](https://agentmods.dev/instructions/parawanderer/opentagviewer/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/parawanderer/opentagviewer/agents-md"><img src="https://agentmods.dev/badge/instructions/parawanderer/opentagviewer/agents-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 11,046 This file is loaded in full into every session.
When invoked 11,046 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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 $0.11046 $0.11046
Opus 5 $0.05523 $0.05523
Sonnet 5 $0.02209 $0.02209
Haiku 4.5 $0.01105 $0.01105

Measured 2d ago against content hash 7f166ad3671f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

OpenTagViewer 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 · 801 lines

How it starts

The opening of the file, as written. The whole thing — 801 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Rules for agents working on OpenTagViewer. Written for automated contributors, but the constraints apply to anyone.

This file is owned and maintained by agents, and keeping it current is part of the work rather than a favour to whoever comes next. @parawanderer asked for that and has not read it since. No human reviews what lands here, so the agent writing a change is the only check on it.

What that means in practice:

  • If you learned something the hard way, write it down in the same change that taught you. The next agent starts here, and anything left out is an afternoon they pay for and you did not.
  • The reason travels with the rule. An instruction with no reasoning attached is one a later agent deletes the first time it looks inconvenient. That is why the entries here argue.
  • Earn it. Nobody is filtering this, so a rule that has not actually cost somebody something does not belong. Rule 10 has the test.
  • Do not carry this register outside the repository. It is written for agents who need to be argued out of breaking something. A pull request review, an issue reply, or anything else a person reads is a different job. See rule 16.

What this project is

An Android app that shows Apple AirTag locations without an Apple device. Tags are exported from a Mac once (see the wiki), imported as a zip, and located via Apple's Find My network through FindMy.py.

Layer Technology
App Android, Java (not Kotlin), Gradle Kotlin DSL, compileSdk/targetSdk 35, minSdk 24
Apple protocol Chaquopy — CPython 3.12 embedded, bridged in app/src/main/python/main.py
Persistence Room (opentagviewer-db)
Async RxJava3 through repositories and services
Boilerplate Lombok (@Builder, @Getter on entities)
Desktop exporter python/ — tkinter wizard, PyInstaller

app/src/main/python/ is packaged into the APK by Chaquopy. Nothing in it may import Android or Java types — that is what makes it testable on plain CPython.

Read the full file on GitHub · 801 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 · +28 lines · +401 tokens per session 7f166ad3671f
  2. 6d ago First seen · 773 lines · 10,645 tokens per session scan A fab1a2e74cd9

Subscribe to this mod's changes

OpenTagViewer AGENTS.md is an instructions file published in the GitHub repository parawanderer/OpenTagViewer (372 stars, last pushed 3d ago), licensed MIT. It adds 11,046 tokens to every session, about $0.0552 per session on Opus 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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