phoenix_test_playwright: Instructions file for Codex

AGENTS.md

phoenix_test_playwright AGENTS.md is an instructions file for Codex, OpenCode from ftes/phoenix_test_playwright. It costs 265 tokens per session, scanned A, original, MIT.

Project-specific development instructions for an Elixir application and its Playwright browser-testing compatibility suite. Playwright is a tool for automating real browser interactions.

In plain words
What is it for?
Use it while changing the project to run targeted tests, perform the final checks, update documentation and the changelog, and test browser transport changes.
Why use it?
It tells contributors which tool versions and checks to use, where browser-specific tests belong, and how to avoid unnecessary changes to copied upstream tests.

Instructions file for CodexOpenCode

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

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

Reuse

Borrowing it

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

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 phoenix_test_playwright AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/ftes/phoenix_test_playwright/agents-md/github.svg)](https://agentmods.dev/instructions/ftes/phoenix_test_playwright/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/ftes/phoenix_test_playwright/agents-md"><img src="https://agentmods.dev/badge/instructions/ftes/phoenix_test_playwright/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.

agentmods 80×15 button for phoenix_test_playwright AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/ftes/phoenix_test_playwright/agents-md"><img src="https://agentmods.dev/badge/instructions/ftes/phoenix_test_playwright/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 265 This file is loaded in full into every session.
When invoked 265 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 $0.00265 $0.00265
Opus 5.5 $0.00106 $0.00106
Sonnet 5.5 $0.00053 $0.00053
Haiku 4.5 $0.00026 $0.00026

Measured 2mo ago against content hash ab940b0fd315, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

phoenix_test_playwright 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 · 17 lines

What it actually says

Dev

  • Use tool versions from .tool-versions; prefer mise exec -- <command> (for example mise exec -- mix check).
  • If your shell is already activated by mise/direnv, plain mix ... commands are fine.
  • Run targeted tests often while changing files.
  • When feature is complete run mix check.
  • When feature is complete, update CHANGELOG.md.
  • Always keep docs up to date (exdoc @doc + @moduledoc, README.md)
  • If you changed browser transport / websocket behavior, also run mix test.websocket.

phoenix_test upstream compatibility

  • test/phoenix_test/upstream/ is a mirror of upstream phoenix_test tests and is used as a compatibility suite.
  • Do not add new Playwright-specific behavior tests under test/phoenix_test/upstream/.
  • Put Playwright-only behavior tests in test/phoenix_test/playwright_test.exs (or other non-upstream/ test files).
  • test/support/upstream/web_app/ is also copied from upstream and should be changed as little as possible.
  • If you must change an upstream-mirrored file, keep the delta minimal and document why.
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 · 17 lines · 265 tokens per session scan A ab940b0fd315

Subscribe to this mod's changes

phoenix_test_playwright AGENTS.md is an instructions file published in the GitHub repository ftes/phoenix_test_playwright (89 stars, last pushed today), licensed MIT. It adds 265 tokens to every session, about $0.0011 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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