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Agent skill

E2E Agent Browser

by jh941213 in jh941213/my-cc-harness

E2E test automation using agent-browser CLI. An agent skill from jh941213/my-cc-harness.

No licenceAuto-check: notesTesting & QA

Install E2E Agent Browser

skills CLI
$ npx skills add jh941213/my-cc-harness --skill e2e-agent-browser -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install jh941213/my-cc-harness e2e-agent-browser --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/jh941213/my-cc-harness.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills_en/e2e-agent-browser .claude/skills/e2e-agent-browser && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
e2e-agent-browser
GitHub stars
126
Token cost
~3.1k tokens
SKILL.md length
264 words
Files
1
Skills in repo
62
Repo updated
First seen
Licence
None found

At a glance

E2E test automation using agent-browser CLI. An agent skill from jh941213/my-cc-harness.

  • Works in 8 steps: Snapshot + Ref Workflow → Snapshot Options → JSON Mode (for AI agents) → …
  • Tasks that involve Browser automation
  • SKILL.md covers When to Use This Skill, Installation, Core Concepts and E2E Test Patterns, plus 4 more sections
  • Calls npm; needs BROWSERBASE_API_KEY

What it does

E2E Agent Browser is an agent skill from jh941213/my-cc-harness. E2E test automation using agent-browser CLI. Performs stable browser tests with snapshot-based accessibility trees and the ref system. Triggers: "E2E", "browser testing", "agent-browser", "write e2e tests", "E2E testing", "browser automation" Anti-triggers: "unit tests", "API tests", "pytest", "Jest tests only", "use Playwright directly"

Its SKILL.md is about 3.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Testing & QA, covering Browser automation, End-to-end testing and Unit testing. It works with Jest, Playwright and pytest.

When your agent uses it

  • Tasks that involve Browser automation
  • Tasks that involve End-to-end testing
  • Tasks that involve Unit testing

Example prompts

  • “browser testing”
  • “agent-browser”
  • “write e2e tests”
  • “/e2e-agent-browser”

Requirements

  • Node.js
  • A credential in BROWSERBASE_API_KEY

Workflow steps

8 steps, taken from the step headings in SKILL.md.

  1. Snapshot + Ref Workflow
  2. Snapshot Options
  3. JSON Mode (for AI agents)
  4. Snapshot-First Approach
  5. Stable Waits
  6. Error Handling
  7. Environment-Specific Configuration
  8. Test Isolation

What it can do on your machine

Read from SKILL.md and the folder at commit e9210e2. 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:

    • npm

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

  • Network

    Links to these hosts (documentation or services it may open):

    • agent-browser.dev
    • github.com
    • playwright.dev

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

  • Credentials

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

    • BROWSERBASE_API_KEY

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

Context cost

E2E Agent Browser loads about 3.1k tokens when it runs. Until then it costs about 89 tokens; SKILL.md has 264 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~89
When it runs · the whole SKILL.md, loaded when a task matches
~3.1k

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

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NoteMentions a .env fileSKILL.md:611
    # .env.test

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 264 words (~3,148 tokens).

“Comprehensive guide for writing and running E2E tests using agent-browser, a headless browser automation CLI for AI agents.”

— opening of SKILL.md by jh941213
name
e2e-agent-browser
user-invocable
false

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills_en/e2e-agent-browser of jh941213/my-cc-harness.

Open the folder on GitHubat commit e9210e2

Compare with similar skills

E2E Agent Browser next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

E2E Agent Browser compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
E2E Agent Browser this skilljh941213/my-cc-harness126—~3.1kAutomated safety check: NotesNone
Playwright Testingchongdashu/vibejam-starter-pack149—~2.2kAutomated safety check: PassNone
Playwright Testingchongdashu/vibejam-starter-pack149—~2.1kAutomated safety check: PassNone
E2E TestingOpentrons/opentrons521—~3kAutomated safety check: NotesApache-2.0
Walkontable Rendering Engine Testinghandsontable/handsontable22k—~875Automated safety check: PassCustom licence
Dotnet Testingnovotnyllc/dotnet-artisan233—~972Automated safety check: PassMIT

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Works with

Categories

Questions about E2E Agent Browser

What does E2E Agent Browser do?

E2E test automation using agent-browser CLI. An agent skill from jh941213/my-cc-harness. E2E Agent Browser is an agent skill from jh941213/my-cc-harness. E2E test automation using agent-browser CLI.

When should I use E2E Agent Browser?

E2E Agent Browser fits situations like: tasks that involve Browser automation; tasks that involve End-to-end testing; tasks that involve Unit testing.

How do I install E2E Agent Browser in Claude Code?

Run `npx skills add jh941213/my-cc-harness --skill e2e-agent-browser -a claude-code`. Or copy the skill folder (skills_en/e2e-agent-browser in jh941213/my-cc-harness) into .claude/skills/e2e-agent-browser in your project. Claude Code loads it when a task matches its description.

How do I install E2E Agent Browser in Codex?

Run `npx skills add jh941213/my-cc-harness --skill e2e-agent-browser -a codex`. Or copy the skill folder (skills_en/e2e-agent-browser in jh941213/my-cc-harness) into .agents/skills/e2e-agent-browser in your project. Codex loads it when a task matches its description.

Can I use E2E Agent Browser in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add jh941213/my-cc-harness --skill e2e-agent-browser -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/e2e-agent-browser, .gemini/skills/e2e-agent-browser, .github/skills/e2e-agent-browser and .opencode/skills/e2e-agent-browser in your project.

What does E2E Agent Browser need to run?

Going by SKILL.md and its folder, E2E Agent Browser needs the command-line tools its instructions call (npm) and credentials named BROWSERBASE_API_KEY. Our summary lists: Node.js; A credential in BROWSERBASE_API_KEY.

Does E2E Agent Browser access the network?

SKILL.md names 3 domains. As links in the text: agent-browser.dev, github.com and playwright.dev. This is read from the text; nothing was executed.

Is E2E Agent Browser safe to install?

Our automated static check of SKILL.md found notes only (mentions a .env file), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does E2E Agent Browser use?

No licence was found for E2E Agent Browser or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does E2E Agent Browser use?

About 3.1k tokens (SKILL.md is roughly 13k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to E2E Agent Browser?

Skills that share tags, products or a category with E2E Agent Browser: Playwright Testing (chongdashu/vibejam-starter-pack, 149 stars), Playwright Testing (chongdashu/vibejam-starter-pack, 149 stars), E2E Testing (Opentrons/opentrons, 521 stars) and Walkontable Rendering Engine Testing (handsontable/handsontable, 22k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains E2E Agent Browser?

jh941213 (a GitHub user) maintains it in jh941213/my-cc-harness, which has 126 GitHub stars. The repository holds 62 skills in this directory. The repository was last updated on August 3, 2026.

Source: jh941213/my-cc-harness on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.