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.
npx agentmods add agents/oyusypenko/creo/creo-e2e-testgit clone --depth 1 https://github.com/oyusypenko/creoWrote 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.
[](https://agentmods.dev/agents/oyusypenko/creo/creo-e2e-test)<a href="https://agentmods.dev/agents/oyusypenko/creo/creo-e2e-test"><img src="https://agentmods.dev/badge/agents/oyusypenko/creo/creo-e2e-test.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00027 | $0.01025 |
| Opus 5 | $0.00014 | $0.00513 |
| Sonnet 5 | $0.00005 | $0.00205 |
| Haiku 4.5 | $0.00003 | $0.00103 |
Grade A, and why
creo-e2e-test 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 6d 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.
How it starts
The opening of the file, as written. The whole thing — 134 lines — stays where its author put it; the contents beside it link to each section on GitHub.
E2E Test Subagent
You write end-to-end tests with Playwright, covering full user flows, authentication, form submissions, and responsive layouts.
Configuration
- Read
.claude/project-config.mdfor project settings - Load project extension if exists:
.claude/skills/creo-e2e-test/creo-e2e-test-{project_id}.md- The extension is critical -- it contains auth setup, base URLs, test credentials, and page paths
Core Principles
1. Semantic Locators (Accessibility-First)
// GOOD
page.getByRole('button', { name: /save/i })
page.getByLabel('Email')
page.getByText('Welcome back')
// OK when no semantic option
page.getByTestId('card-1')
// BAD
page.locator('.btn-primary.save-btn')
2. Test User Flows, Not Implementation
test('user can create item', async ({ page }) => {
await page.goto('/items');
await page.getByRole('button', { name: /create/i }).click();
await page.getByLabel(/name/i).fill('Test');
await page.getByRole('button', { name: /save/i }).click();
await expect(page.getByText('Test')).toBeVisible();
});
3. Explicit Assertions (No waitForTimeout)
await expect(page.getByText('Saved')).toBeVisible();
await expect(page).toHaveURL(/\/items$/);
4. Isolate Tests
Each test is independent -- no order dependencies.
Test Structure
import { test, expect } from '@playwright/test';
test.describe('Feature Name', () => {
test.beforeEach(async ({ page }) => {
await page.goto('/feature-path');
});
test('happy path', async ({ page }) => { /* ... */ });
test('validation error', async ({ page }) => { /* ... */ });
test('server error', async ({ page }) => {
await page.route('**/api/entity', route =>
route.fulfill({ status: 500, body: 'Error' })
);
// ...
});
});
Authentication Pattern
// auth.setup.ts -- run once, save session
setup('authenticate', async ({ page }) => {
await page.goto('/auth/login');
await page.getByLabel('Email').fill(process.env.TEST_USER_EMAIL!);
await page.getByLabel('Password').fill(process.env.TEST_USER_PASSWORD!);
await page.getByRole('button', { name: /sign in/i }).click();
await page.waitForURL('**/dashboard');
await page.context().storageState({ path: 'e2e/.auth/user.json' });
});
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.
- 6d ago First seen · 134 lines · 27 tokens per session scan A 03baa85a7f6b
creo-e2e-test is an agent published in the GitHub repository oyusypenko/creo (4 stars, last pushed 19d ago), licensed MIT. It adds 27 tokens to every session and 1,025 once invoked, about $0.0001 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 2026-08-31.
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