osaurus-browser

osaurus-browser is a skill for Claude Code, Codex from osaurus-ai/osaurus-tools. It costs 55 tokens per session (2,109 once invoked), scanned A, original, MIT.

A guide for using headless browsers, which are browsers controlled by software instead of a person. It covers logged-in sessions, page elements, downloads, dialogs, cookies, and other browser controls.

In plain words
What is it for?
Automating website tasks such as opening pages, using logged-in accounts, inspecting pages, handling dialogs, managing cookies, and checking console or network activity.
Why use it?
It gives the coding agent a consistent way to work with websites that need interaction or sign-in. Persistent, separate sessions avoid repeating logins and keep agents from interfering with each other.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Automating website tasks such as opening pages, using logged-in accounts, inspecting pages, handling dialogs, managing cookies, and checking console or network activity.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/osaurus-ai/osaurus-tools/browser
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.

Any agent
npx skills add osaurus-ai/osaurus-tools --skill browser
Clone the repo
git clone --depth 1 https://github.com/osaurus-ai/osaurus-tools

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for osaurus-browser

README.md
[![agentmods](https://agentmods.dev/badge/skills/osaurus-ai/osaurus-tools/browser/github.svg)](https://agentmods.dev/skills/osaurus-ai/osaurus-tools/browser)
Your own site
<a href="https://agentmods.dev/skills/osaurus-ai/osaurus-tools/browser"><img src="https://agentmods.dev/badge/skills/osaurus-ai/osaurus-tools/browser/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for osaurus-browser

Your own site · 80×15
<a href="https://agentmods.dev/skills/osaurus-ai/osaurus-tools/browser"><img src="https://agentmods.dev/badge/skills/osaurus-ai/osaurus-tools/browser.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 55 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,109 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Excessive Agency · line 17
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
How audits are shown
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 5.1 $0.00055 $0.02109
Opus 5.5 $0.00022 $0.00844
Sonnet 5.5 $0.00011 $0.00422
Haiku 4.5 $0.00006 $0.00211

Measured 2mo ago against content hash bf65e7720048, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

osaurus-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 2mo 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.

tools/browser/SKILL.md · 228 lines

How it starts

The opening of the file, as written. The whole thing — 228 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Osaurus Browser

Headless browser automation via element refs. Every action returns a page snapshot automatically — you rarely need to call browser_snapshot separately.

Per-agent persistent sessions

Your browser session is persistent across runs and isolated per agent. Cookies, localStorage, and IndexedDB are stored on disk, keyed by the active agent. That means:

  • Never ask the user for passwords, 2FA codes, OAuth approvals, or any credentials in chat. The user signs in once via the helper window (see browser_open_login); after that you simply call browser_navigate and run logged-in.
  • Don't try to type credentials into login forms yourself. Captchas, risk-based 2FA, and OAuth all break that flow. Use browser_open_login instead.
  • Two different agents have completely separate browser profiles — agent A signing into Gmail does not log agent B in.

Sign-in flow

When browser_navigate returns a LOGIN_REQUIRED error envelope, the response includes the login URL the page redirected to. Your job is:

  1. Acknowledge in chat: "I need to sign in to . I'm opening a browser window for you."
  2. Call browser_open_login with the suggested URL.
  3. Wait for the user to confirm in chat that they're done signing in (the tool also returns when the window closes).
  4. Retry the original browser_navigate.
// 1. Got LOGIN_REQUIRED from browser_navigate
// 2. Open the helper window
{ "url": "https://github.com/login" }
// 3. After the user signs in and closes the window, retry
{ "url": "https://github.com/notifications" }

If sign-in fails repeatedly (wrong password, expired session, 2FA issues), ask the user before calling browser_reset_session — that tool wipes the entire profile, including any other sites the user signed into for this agent.

Typical Flow (2 calls)

1. browser_navigate(url)             → snapshot with refs [E1] [E2] [E3]
2. browser_do([type E1, type E2, click E3]) → snapshot of result page

Key Concepts

Read the full file on GitHub · 228 lines

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. 2mo ago First seen · 228 lines · 55 tokens per session scan A bf65e7720048

Subscribe to this mod's changes

osaurus-browser is a skill published in the GitHub repository osaurus-ai/osaurus-tools (61 stars, last pushed 2mo ago), licensed MIT. It adds 55 tokens to every session and 2,109 once invoked, about $0.0002 per session on Opus 5.5. 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.

Related

osaurus-browser compared with skills from other repositories

osaurus-browser next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
osaurus-browserosaurus-ai/osaurus-toolsSkill612mo agoMITA55Claude Code, Codex
interactive-loginyc-software/qmSkill16kyesterdayMITA46Claude Code, Codex
pinchtab-mcppinchtab/pinchtabSkill11k10d agoMITA52Claude Code, Codex
azure-messaging-webpubsub-javamicrosoft/skillsSkill3.2kyesterdayMITA43Claude Code
cua-driverdavidondrej/skillsSkill4.3k3d agoMITA68Claude Code, Codex
open-design-browsercompozy/compozySkill2.8kyesterdayMITA56Claude Code, Codex
southwestborski/travel-hacking-toolkitSkill895yesterdayMITA40Claude Code