browser

A headless browser tool that controls a web browser without displaying it on screen. It can open pages, inspect their accessible elements, click, type, scroll, take screenshots, run JavaScript, and read console errors.

In plain words
What is it for?
Navigating websites, filling forms, checking page behavior, capturing full-page screenshots, running page scripts, and investigating browser console problems.
Why use it?
It lets an agent test or inspect websites through real browser interactions instead of relying only on source code or HTTP requests. Separate sessions can keep browser tasks isolated.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/fisker086/aiops/browser
Any agent
npx skills add fisker086/AIOps --skill browser
Clone the repo
git clone --depth 1 https://github.com/fisker086/AIOps

Made for: Claude Code, Codex.

Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 515 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00030 $0.00515
Opus 5 $0.00015 $0.00258
Sonnet 5 $0.00006 $0.00103
Haiku 4.5 $0.00003 $0.00052

Measured 2d ago against content hash 2fbe64529b6a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

browser 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 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.

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.

skills/browser/SKILL.md · 44 lines

What it actually says

Browser Skill

Provides server-side headless browser automation using agent-browser CLI (Playwright/Chromium backend):

  • Navigate to URLs (with auto-snapshot and bot detection)
  • Snapshot accessibility tree with element references (e.g., @e5)
  • Click elements by reference
  • Type text into input fields
  • Scroll up/down
  • Navigate back in history
  • Press keyboard keys
  • Take full-page screenshots (base64 PNG)
  • Execute JavaScript in page context
  • Read console messages and JS errors
  • Session isolation per task_id

Use builtin_browser tool with fields:

  • operation: one of "navigate", "snapshot", "click", "type", "scroll", "back", "press", "screenshot", "eval", "console", "close"
  • url: URL to navigate to (required for navigate)
  • ref: Element reference from snapshot (e.g., @e5) for click/type
  • text: Text to type (for type) or key to press (for press)
  • js: JavaScript expression to evaluate (required for eval)
  • task_id: Session identifier (default: "default"); each task_id gets its own browser session
  • direction: Scroll direction "up" or "down" (default: "down")
  • full: Full page screenshot "true"/"false" (default: "false")
  • clear: Clear console/errors after reading "true"/"false"

Response format:

  • Always return the result in a single message. When taking a screenshot, embed the base64 PNG inline in your reply via ![alt](data:image/png;base64,...) — do not split into multiple messages.

Notes:

  • Requires agent-browser CLI installed: npx agent-browser install --with-deps
  • Each task_id maintains an isolated browser session with persistent state
  • Sessions auto-clean after 5 minutes of inactivity
  • Element references from snapshot (e.g., @e5) are used for click/type — not CSS selectors
  • For simple HTTP fetches, prefer builtin_http_client (faster, lighter)
Changes

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.

  1. 2d ago First seen · 44 lines · 30 tokens per session scan A 2fbe64529b6a

Subscribe to this mod's changes

browser is a skill published in the GitHub repository fisker086/AIOps (21 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 30 tokens to every session and 515 once invoked, about $0.0002 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 2026-08-30.

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