# Core (agent skill)

> Core is an agent skill (a SKILL.md file) from vercel-labs/agent-browser. Core agent-browser usage guide. Read this before running any agent-browser commands. It works with Claude Code and Cursor and has 43,583 GitHub stars across a repository of 7 listed skills.

Core agent-browser usage guide. Read this before running any agent-browser commands. Covers the snapshot-and-ref workflow, navigating pages, interacting with elements (click, fill, type, select), extracting text and data, taking screenshots, managing tabs, handling forms and auth, waiting for content, running multiple browser sessions in parallel, and troubleshooting common failures.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/vercel-labs/agent-browser |
| Skill path | skill-data/core/SKILL.md |
| Skill name | core |
| GitHub stars | 43,583 |
| Installs on skills.sh | not listed |
| License | Apache-2.0 |
| Skills in repo | 7 |
| Plugin marketplace | agent-browser |
| Official | yes |
| Works with | Claude Code, Cursor |
| Category | Data & analysis |
| Last commit | Oct 6, 2026 |

## When it triggers

- Use when the user asks to interact with a website, fill a form, click something, extract data, take a screenshot, log into a site, test a web app, or automate any browser task.

## Add this skill

### Claude Code

```sh
/plugin marketplace add vercel-labs/agent-browser
/plugin install agent-browser@agent-browser
```

In the Claude apps, zip the skill folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

### ChatGPT / Codex

```sh
git clone --depth 1 https://github.com/vercel-labs/agent-browser.git
cp -r agent-browser/skill-data/core .agents/skills/core   # repo; ~/.agents/skills for all projects
```

### Cursor

```sh
git clone --depth 1 https://github.com/vercel-labs/agent-browser.git
cp -r agent-browser/skill-data/core .cursor/skills/core   # project; ~/.cursor/skills for all projects
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

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