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 skills/cwinvestments/memstack/webapp-testingnpx skills add cwinvestments/memstack --skill webapp-testinggit clone --depth 1 https://github.com/cwinvestments/memstackWhat 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 | $0.00075 | $0.01598 |
| Opus 5 | $0.00037 | $0.00799 |
| Sonnet 5 | $0.00015 | $0.00320 |
| Haiku 4.5 | $0.00007 | $0.00160 |
Grade A, and why
memstack-development-webapp-testing scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- Do NOT use for API-only testing (use curl/fetch patterns) How it starts
The opening of the file, as written. The whole thing — 217 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Webapp Testing — Writing browser tests...
Produces Playwright end-to-end tests that verify real user flows in a browser.
Activation
| Trigger | Status |
|---|---|
| User says "write browser tests" or "playwright test" | ACTIVE |
| User says "test this page" or "e2e test" | ACTIVE |
| User says "test the UI" or "browser test" | ACTIVE |
| User wants unit tests or API tests | NOT this skill — use standard test patterns |
| User wants load testing | NOT this skill |
Context Guard
- Do NOT use for unit tests (Jest, Vitest without browser)
- Do NOT use for API-only testing (use curl/fetch patterns)
- Do NOT use for performance benchmarking
- This skill ONLY produces Playwright browser tests
Steps
Step 1: Assess the target
Determine what to test:
| Parameter | How to find | Example |
|---|---|---|
| App URL | Check package.json scripts, .env, or ask | http://localhost:3000 |
| Framework | Check package.json dependencies | Next.js, React, SvelteKit |
| Auth required? | Check for login pages, auth middleware | Yes/No |
| Key user flows | Ask or infer from routes | Sign up, checkout, search |
# Check if Playwright is already installed
cat package.json | grep -i playwright
# Check existing test structure
find . -name "*.spec.ts" -o -name "*.test.ts" | head -20
Step 2: Set up Playwright (if not installed)
npm init playwright@latest
# or
pnpm add -D @playwright/test
npx playwright install
Confirm playwright.config.ts exists. If not, create with sensible defaults:
import { defineConfig, devices } from '@playwright/test';
export default defineConfig({
testDir: './tests/e2e',
fullyParallel: true,
forbidOnly: !!process.env.CI,
retries: process.env.CI ? 2 : 0,
workers: process.env.CI ? 1 : undefined,
reporter: 'html',
use: {
baseURL: 'http://localhost:3000',
trace: 'on-first-retry',
screenshot: 'only-on-failure',
},
projects: [
{ name: 'chromium', use: { ...devices['Desktop Chrome'] } },
],
webServer: {
command: 'npm run dev',
url: 'http://localhost:3000',
reuseExistingServer: !process.env.CI,
},
});
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.
- 2d ago First seen · 217 lines · 75 tokens per session scan A 7c5fd3ad4d11
memstack-development-webapp-testing is a skill published in the GitHub repository cwinvestments/memstack (417 stars, last pushed 5d ago), licensed MIT. It adds 75 tokens to every session and 1,598 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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