browser-act

A browser-automation tool for AI agents that can fetch, view, and extract content from web pages as they appear in a browser.

In plain words
What is it for?
Use it to open websites, inspect rendered pages, and collect information from URLs through browser actions.
Why use it?
It helps when a page depends on JavaScript or browser interaction, so a simple web request cannot provide the needed content.

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/itwanger/tobebetterjavaer/browser-act
Any agent
npx skills add itwanger/toBeBetterJavaer --skill browser-act
Clone the repo
git clone --depth 1 https://github.com/itwanger/toBeBetterJavaer

Made for: Claude Code, Codex.

Per session 159 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 760 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown 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 $0.00159 $0.00760
Opus 5 $0.00079 $0.00380
Sonnet 5 $0.00032 $0.00152
Haiku 4.5 $0.00016 $0.00076

Measured 2d ago against content hash c03a115aac8c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

browser-act 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.

- Lightweight extraction — fast JS-rendered content fetch without opening a browser session, advanced WebFetch/curl replacement
.agents/skills/browser-act/SKILL.md · 60 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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 · 60 lines · 159 tokens per session scan A c03a115aac8c

Subscribe to this mod's changes

browser-act is a skill published in the GitHub repository itwanger/toBeBetterJavaer (17,538 stars, last pushed 4d ago), with no licence file. It adds 159 tokens to every session and 760 once invoked, about $0.0008 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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