ECC is a toolkit that organizes and improves how coding agents work through skills, memory, security checks, research practices, and related extensions. It is for developers using agents such as Claude Code, Codex, OpenCode, and Cursor.
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 commands/affaan-m/ecc/e2egit clone --depth 1 https://github.com/affaan-m/ECCWrote 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/commands/affaan-m/ecc/e2e)<a href="https://agentmods.dev/commands/affaan-m/ecc/e2e"><img src="https://agentmods.dev/badge/commands/affaan-m/ecc/e2e.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 | $0.00010 | $0.00576 |
| Opus 5 | $0.00005 | $0.00288 |
| Sonnet 5 | $0.00002 | $0.00115 |
| Haiku 4.5 | $0.00001 | $0.00058 |
Grade A, and why
e2e 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 yesterday.
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.
Copies of this mod
8 near-identical copies found in the catalogue:
How it starts
The opening of the file, as written. The whole thing — 106 lines — stays where its author put it; the contents beside it link to each section on GitHub.
E2E Command
Generate and run end-to-end tests using Playwright: $ARGUMENTS
Your Task
- Analyze user flow to test
- Create test journey with Playwright
- Run tests and capture artifacts
- Report results with screenshots/videos
Test Structure
import { test, expect } from '@playwright/test'
test.describe('Feature: [Name]', () => {
test.beforeEach(async ({ page }) => {
// Setup: Navigate, authenticate, prepare state
})
test('should [expected behavior]', async ({ page }) => {
// Arrange: Set up test data
// Act: Perform user actions
await page.click('[data-testid="button"]')
await page.fill('[data-testid="input"]', 'value')
// Assert: Verify results
await expect(page.locator('[data-testid="result"]')).toBeVisible()
})
test.afterEach(async ({ page }, testInfo) => {
// Capture screenshot on failure
if (testInfo.status !== 'passed') {
await page.screenshot({ path: `test-results/${testInfo.title}.png` })
}
})
})
Best Practices
Selectors
- Prefer
data-testidattributes - Avoid CSS classes (they change)
- Use semantic selectors (roles, labels)
Waits
- Use Playwright's auto-waiting
- Avoid
page.waitForTimeout() - Use
expect().toBeVisible()for assertions
Test Isolation
- Each test should be independent
- Clean up test data after
- Don't rely on test order
Artifacts to Capture
- Screenshots on failure
- Videos for debugging
- Trace files for detailed analysis
- Network logs if relevant
Test Categories
-
Critical User Flows
- Authentication (login, logout, signup)
- Core feature happy paths
- Payment/checkout flows
-
Edge Cases
- Network failures
- Invalid inputs
- Session expiry
-
Cross-Browser
- Chrome, Firefox, Safari
- Mobile viewports
Report Format
E2E Test Results
================
PASS: Passed: X
FAIL: Failed: Y
SKIPPED: Skipped: Z
Failed Tests:
- test-name: Error message
Screenshot: path/to/screenshot.png
Video: path/to/video.webm
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.
- yesterday First seen · 106 lines · 10 tokens per session scan A e6bc8984d292
e2e is a command published in the GitHub repository affaan-m/ECC (246,988 stars, last pushed yesterday), licensed MIT. It adds 10 tokens to every session and 576 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 2026-09-03.
Other commands, from other repositories
t00-playwright-test
Playwright UI 测试 — 在真实浏览器中测试本地运行的 Web App,验证登录流程、功能路径、边缘案例。PJ90 等前端项目适用。.
expect
Diff-aware AI browser testing — reads the git diff, maps changes to affected pages via the route map, generates a targeted test plan, and executes it via agent-browser (Rust daemon + CDP, ARIA-tree-first) with pass/fail reporting. Use when testing UI changes, verifying PRs before merge, or running regression checks on…
fire-verify-uat
Conversational User Acceptance Testing with automatic parallel diagnosis on failures.
auto-verify
프론트엔드 UX 검증 — Playwright 기반 비주얼 검증을 실행합니다.
record
Record a browser walkthrough of a URL using Antigravity (agy). Generates .webm video, screenshots, and a report. Auto-converts to MP4 if ffmpeg is available.
fire-test
Run Dominion Flow plugin integration tests to verify all commands and integrations work correctly.