A controlled interface for Rudder’s built-in Browser, used to open pages and inspect or interact with visible web content.

Opening or showing pages, inspecting visible or interactive state, navigating, clicking, and working with tabs in Rudder’s browser.

It ensures browser actions use the intended Rudder browser session and its existing tabs when the user explicitly chooses that browser.

browser — Skill by Undertone0809

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/undertone0809/rudder/browser

Any agent

npx skills add Undertone0809/rudder --skill browser

Clone the repo

git clone --depth 1 https://github.com/Undertone0809/rudder

Made for: Claude Code, Codex.

Per session 142 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,232 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.

Model	Per session	Once invoked
Fable 5	$0.00142	$0.02232
Opus 5	$0.00071	$0.01116
Sonnet 5	$0.00028	$0.00446
Haiku 4.5	$0.00014	$0.00223

Measured 3d ago against content hash 85e5e32d7c53, 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 3d 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.

server/resources/bundled-skills/browser/SKILL.md · 188 lines

How it starts

The opening of the file, as written. The whole thing — 188 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Browser

Use Rudder's built-in Browser only when the user explicitly names or selects that surface, for example by saying Rudder Browser, Rudder's built-in Browser, or $browser, or by referring to a page or tab already open there. The request must identify the Rudder Browser as the intended surface; a generic request to browse the web, visit a URL, research a site, test localhost, take a screenshot, or interact with a page is not enough to invoke this skill.

When explicitly selected, the Browser may share signed-in website state from the local Rudder Browser profile. If the user does not explicitly select it, do not open, inspect, or interact with Rudder's Browser on the skill's behalf.

The Browser is a separate optional integration named rudder-browser. Do not look for Browser tools inside rudder-tools, launch another browser, or inspect Browser profile files to work around it.

Start With The Right State

Call rudder_browser_tabs once. Reuse a run-owned tab when it already has useful in-progress state.
Call rudder_browser_user_tabs only when the task refers to a page the user already has open in Rudder. It returns privacy-safe hostname and origin summaries, never the real title, path, query, fragment, or credentials. Results are read-only context; opaque ids cannot be passed to interaction tools. Open the returned origin only when it is sufficient. Otherwise ask the user for the exact URL instead of guessing a path.
Open a new run-owned tab with rudder_browser_open when no existing run tab fits. Navigate an existing tab only when replacing its current page is intentional.
Keep Browser work hidden by default. Use rudder_browser_visibility when the user asks to see the page or watching the interaction is useful.

If the Browser server is disabled or unavailable, follow Availability And Recovery. Do not silently substitute another browser surface.

Observe, Decide, Act

Before each interaction, understand the current visible state with the cheapest observation that answers the next question:

Read the full file on GitHub · 188 lines

Files

What ships with it

5 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.

3d ago First seen · 188 lines · 142 tokens per session scan A 85e5e32d7c53

Subscribe to this mod's changes

browser is a skill published in the GitHub repository Undertone0809/rudder (287 stars, last pushed 3d ago), licensed Apache-2.0. It adds 142 tokens to every session and 2,232 once invoked, about $0.0007 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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