E2E

What it does

When your agent uses it

• A project depends on e2e
• Asked for end-to-end
• Agentic UI tests
• An e2e run fails

Example prompts

• “/e2e”

Requirements

• Node.js
• A credential in AI_GATEWAY_API_KEY

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Look at what exists: e2e.config.ts or e2e.config.mts, the tests glob
2. 2Learn the screens before writing a test: routes, labels, roles, button
3. 3Write tests/.e2e.ts. Drive the flow with agent.act, one goal
4. 4Run one file: npx e2e run tests/.e2e.ts. Agent steps need a
5. 5Read the failure: the reporter prints the error code, message, and a code

What it can do on your machine

Read from SKILL.md and the folder at commit 99446fc. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • npx
  • pnpm

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md. Its commands use npx and pnpm, which can reach the network depending on how they are called.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • AI_GATEWAY_API_KEY

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

E2E loads about 2.1k tokens when it runs, and up to ~29k if it reads all its reference files. Until then it costs about 172 tokens; SKILL.md has 898 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~172

When it runs · the whole SKILL.md, loaded when a task matches

~2.1k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~29k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from callstack/react-native-pager-view at commit 99446fc, republished under its MIT licence (© callstack). 898 words, ~2,105 tokens.

name

e2e

description

Agentic end-to-end tests with e2e, the e2e runner. Covers scaffolding e2e.config.ts, picking the Playwright browser engine or the agent-device mobile engine, starting the app under test from the config, driving flows with agent.act, judging with agent.assert, agent.waitFor, and agent.extract, pinning values with screen, app, browser, and expect, shaping the agent (context, system prompt, tools, personas), the replay cache, the e2e CLI, reading .e2e/report.json, and bug bashes (parallel explore runs proven with repro tests). Use when a project depends on e2e, when asked for end-to-end, browser, mobile, or agentic UI tests, to bug bash or hunt for bugs, or when an e2e run fails.

// e2e.config.ts
import type { E2EConfig } from 'e2e';
import { web } from '@e2e-dev/web';
import { gateway } from 'ai';

export default {
  targets: [
    {
      engine: web(),
      app: {
        url: 'http://127.0.0.1:3000',
        command: { executable: 'pnpm', args: ['dev'], log: '.e2e/logs/app.log' },
      },
    },
  ],
  // The model behind every agent.* step: an AI SDK instance; gateway() from 'ai' reads AI_GATEWAY_API_KEY or a Vercel OIDC token.
  agents: {
    default: {
      model: gateway('openai/gpt-6-luna-fast'),
      system: 'You are a thorough QA agent. Verify every outcome on screen.',
    },
  },
} satisfies E2EConfig;

// tests/billing.e2e.ts
import { test } from '@e2e-dev/web';
import { expect } from 'e2e';

test('a member upgrades to Pro', async ({ app, agent, screen, browser }) => {
  await app.open('/settings/billing');
  await agent.act('upgrade the workspace to the Pro plan');
  await expect(screen.getByRole('status')).toContainText('Pro');
  await expect(browser).toHaveURL('/settings/billing');
});

npx e2e feedback --type bug -m "<one or two sentences>" \
  --task "<what you were doing>" --expected "<...>" --actual "<error code and message>" \
  --approach "<what you tried>" --command "<e2e command>" --agent "<agent / model>"

© callstack, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 8 other files (references) in .agents/skills/e2e of callstack/react-native-pager-view.

• SKILL.md
• references/agent.md
• references/bug-bash.md
• references/debugging.md
• references/explore.md
• references/mcp.md
• references/running.md
• references/setup.md
• references/writing-tests.md

Open the folder on GitHubat commit 99446fc

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in callstack/react-native-pager-view, which our catalogue first saw on October 8, 2026.

• kortix-ai/suna.agents/skills/e2e