core

A usage guide for agent-browser, a tool for navigating websites, interacting with page controls, reading content, taking screenshots, and handling forms.

In plain words
What is it for?
Use it when an agent needs to open pages, click, fill fields, select options, extract data, manage tabs, or work with authentication.
Why use it?
It explains the required way to inspect a page and refer to elements before performing browser actions.

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/friday-platform/friday-studio/skill
Any agent
npx skills add friday-platform/friday-studio --skill skill
Clone the repo
git clone --depth 1 https://github.com/friday-platform/friday-studio

Made for: Claude Code, Codex.

Per session 112 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,680 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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 $0.00112 $0.03680
Opus 5 $0.00056 $0.01840
Sonnet 5 $0.00022 $0.00736
Haiku 4.5 $0.00011 $0.00368

Measured 3d ago against content hash d7cc9dff343c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

core 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.

packages/bundled-agents/src/web/skill/SKILL.md · 446 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

Files

What ships with it

8 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.

  1. 3d ago First seen · 446 lines · 112 tokens per session scan A d7cc9dff343c

Subscribe to this mod's changes

core is a skill published in the GitHub repository friday-platform/friday-studio (101 stars, last pushed 4d ago), with no licence file. It adds 112 tokens to every session and 3,680 once invoked, about $0.0006 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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