hep-browser

hep-browser is a skill for Claude Code from agentlas-ai/Agentlas-OS. It costs 15 tokens per session (545 once invoked), scanned A, original, Apache-2.0.

A browser skill for tasks that need a real rendered web page, including login state, JavaScript behavior, clicks, and forms.

In plain words
What is it for?
Opening pages, inspecting rendered content, clicking controls, filling forms, and performing browser-based tasks.
Why use it?
It provides browser-visible evidence and can reuse an already signed-in browser session when available.

Skill for Claude Code

Written for Claude Code: $ARGUMENTS substitution. Also seen: mentions Codex.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is for c in "$HOME/.agentlas/runtime/current/bin/hephaestus" ./bin/hephaestus; do.

Good fit Opening pages, inspecting rendered content, clicking controls, filling forms, and performing browser-based tasks.

Compare 6 skills from other repositories ↓
About the project

Agentlas OS is a local-first system for creating, storing, borrowing, and running specialist AI agents and temporary agent teams through supported hosts and models. It serves people who want reusable agents that remain available across computers and model workspaces, and the catalogue contains its skills, commands, hooks, agents, instructions, plugin, and rule.

agentlas-ai/Agentlas-OS · 1,103 stars · on GitHub · agentlas.cloud

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/agentlas-ai/Agentlas-OS
agentmods
npx agentmods add skills/agentlas-ai/agentlas-os/hep-browser

Made for: Claude Code.

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 hep-browser

README.md
[![agentmods](https://agentmods.dev/badge/skills/agentlas-ai/agentlas-os/hep-browser.svg)](https://agentmods.dev/skills/agentlas-ai/agentlas-os/hep-browser)
Your own site
<a href="https://agentmods.dev/skills/agentlas-ai/agentlas-os/hep-browser"><img src="https://agentmods.dev/badge/skills/agentlas-ai/agentlas-os/hep-browser.svg" alt="Measured on agentmods" height="20"></a>
Per session 15 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 545 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 pass 7 Sept 2026
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 $0.00015 $0.00545
Opus 5 $0.00008 $0.00272
Sonnet 5 $0.00003 $0.00109
Haiku 4.5 $0.00002 $0.00055

Measured 5d ago against content hash 1bae2393c427, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

hep-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 5d 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.

kimi/skills/hep-browser/SKILL.md · 48 lines

What it actually says

Update fallback: 자동 업데이트가 안 되면 hephaestus update를 한 번 실행하세요. 업데이트하지 않아도 현재 버전 명령은 그대로 동작합니다.

Hephaestus Browser

Raw arguments: everything the user typed after /skill:hep-browser.

Codex plugins cannot register slash commands, so this custom prompt is the explicit entrypoint: /prompts:hep-browser.

Use this when the task needs a real browser, page rendering, login-visible state, click/form behavior, or JS-heavy evidence. Prefer the Agentlas browser hardpoint first.

Behavior:

  • /prompts:hep-browser <url> reads a rendered browser snapshot.
  • /prompts:hep-browser <url> "<instruction>" or /prompts:hep-browser <url> --act "<instruction>" performs browser automation through browser.agent_cli, then captures a snapshot.
  • If the Agentlas Browser CDP port is already live, the command attaches to it by default so logged-in Desktop/browser state is reused.
  • Prefer the human-facing URL a person would type over app-shell automation URLs. For example, use https://mail.google.com/ instead of https://mail.google.com/mail/u/0/#inbox unless that exact deep route is required. Add --raw-url to preserve the exact URL.
  • Use --click @e1 or --click-text "Compose" for LLM-free browser primitives after the host has selected a ref/text target.
  • Add --wait-ms 2000 when a dynamic app opens dialogs after a short delay.
  • Add --read to force snapshot-only mode when extra text is context rather than an action.
RUNNER=""
for c in "$HOME/.agentlas/runtime/current/bin/hephaestus" ./bin/hephaestus; do
  [ -x "$c" ] && RUNNER="$c" && break
done
[ -n "$RUNNER" ] || { echo "Hephaestus runtime not found. Run the installer first." >&2; exit 1; }
"$RUNNER" hep-browser "$ARGUMENTS"

Report whether browser.agent_cli mounted, whether setup is needed, and the receipt id. For automation, also report the action, whether CDP/profile flags were used, and the final snapshot status. If setup is needed, show hep-browser --setup and hep-browser --check.

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. 5d ago First seen · 48 lines · 15 tokens per session scan A 1bae2393c427

Subscribe to this mod's changes

hep-browser is a skill published in the GitHub repository agentlas-ai/Agentlas-OS (1,103 stars, last pushed 2d ago), licensed Apache-2.0. It adds 15 tokens to every session and 545 once invoked, about $0.0001 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 2026-09-03.

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