What is ultimate-browsing?

A web-access skill for reaching pages that ordinary browsing cannot read, such as sites blocked by security checks, pages requiring JavaScript, or login-gated content.

Use it to extract text or data from blocked websites, read articles and forums, get video subtitles or metadata, and access selected social or regional platforms.

It provides escalation paths when a normal fetch returns an error, an empty page, or cannot interact with the site.

ultimate-browsing — Skill by code-yeongyu

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/code-yeongyu/lazycodex/ultimate-browsing

Any agent

npx skills add code-yeongyu/lazycodex --skill ultimate-browsing

Clone the repo

git clone --depth 1 https://github.com/code-yeongyu/lazycodex

Made for: Claude Code, Codex.

Per session 260 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,622 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. 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.

Model	Per session	Once invoked
Fable 5	$0.00260	$0.02622
Opus 5	$0.00130	$0.01311
Sonnet 5	$0.00052	$0.00524
Haiku 4.5	$0.00026	$0.00262

Measured yesterday against content hash b3d974e28376, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ultimate-browsing 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 yesterday.

The scan reads SKILL.md. This mod also ships 20 executable files (engine/__init__.py, engine/__main__.py, engine/bias_check.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

curl -s "https://r.jina.ai/https://weibo.com/<uid>/<pid>" # weibo via Jina

plugins/omo/skills/ultimate-browsing/SKILL.md · 141 lines

How it starts

The opening of the file, as written. The whole thing — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Ultimate Browsing

Escalation web access for tasks a normal browse or fetch cannot complete. Reach for this skill the moment a page is blocked (WAF / 403 / Cloudflare), needs JS rendering, hides behind a login, or lives on a platform a generic fetcher cannot read. Escalate only when the cheaper tier cannot do the job:

Tier 1 — insane-search (headless extraction + WAF bypass) -> Tier 1.5 — agent-reach (platform-native APIs, esp. Chinese platforms) -> Tier 2 — Chrome stealth (real interaction via CloakBrowser + agent-browser).

PHASE 0 — ROUTE FIRST (MANDATORY)

User request
  |
  +- extract text/data from a URL --------------------- TIER 1  insane-search
  +- URL blocked / 403 / Cloudflare / WAF ------------- TIER 1  insane-search
  +- YouTube/Vimeo/TikTok subtitles or metadata ------- TIER 1  insane-search (yt-dlp)
  +- read an article / blog / Reddit / HN / arXiv ----- TIER 1  insane-search
  |
  +- Chinese platform (xhs/douyin/weibo/bilibili/v2ex/wechat)  TIER 1.5 agent-reach
  +- podcast transcript / stock forum ----------------- TIER 1.5 agent-reach
  +- Twitter feed / LinkedIn profile / GitHub via CLI - TIER 1.5 agent-reach
  |
  +- Tier 1/1.5 returned empty or partial ------------- TIER 2  Chrome stealth
  +- click / fill form / scroll / interact ------------ TIER 2  Chrome stealth
  +- screenshot / render / play video ----------------- TIER 2  Chrome stealth
  +- login session across pages / inject cookies ------ TIER 2  Chrome stealth
  +- test web app / QA / dogfood ---------------------- TIER 2  Chrome stealth
  |
  +- simple search query ------------------------------ NOT this skill (use web-search)

Read the matching reference before acting: references/insane-search/README.md, references/agent-reach/README.md, or references/chrome-stealth.md.

Tier 1 — insane-search (headless extraction)

When: content extraction, blocked-URL bypass, media metadata — no browser UI needed. Why first: ~10x faster than a browser, no process spin-up; handles most "fetch this blocked page" requests via curl_cffi TLS impersonation, yt-dlp (1858 sites), Jina Reader, official public APIs, mobile URL transforms, and a Playwright real-Chrome fallback. The engine lives inside this skill at engine/ and is invoked as a module.

Read the full file on GitHub · 141 lines

Files

What ships with it

45 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

yesterday First seen · 141 lines · 260 tokens per session scan A b3d974e28376

Subscribe to this mod's changes

ultimate-browsing is a skill published in the GitHub repository code-yeongyu/lazycodex (3,350 stars, last pushed 23d ago), licensed MIT. It adds 260 tokens to every session and 2,622 once invoked, about $0.0013 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.

DevOps and cloud Security Writing and docs ai ai-agents claude claude-code cli codex

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ultimate-browsing