kernel

kernel is a skill for Claude Code from inkbox-ai/inkbox. It costs 36 tokens per session (296 once invoked), scanned A, original, MIT.

An instruction set that gives an AI agent a cloud web browser and an email account. It lets the agent visit websites, interact with pages, and send or read email.

In plain words
What is it for?
Automating website tasks, filling in forms, reading web pages, checking an inbox, and sending or replying to emails.
Why use it?
It removes the need to connect separate browser-automation and email tools before the agent can work online.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the inkbox plugin — 9 skills shipped together

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/inkbox-ai/inkbox/use-inkbox-kernel
Any agent
npx skills add inkbox-ai/inkbox --skill use-inkbox-kernel
Clone the repo
git clone --depth 1 https://github.com/inkbox-ai/inkbox

Made for: Claude Code.

Or install inkbox, the plugin that ships this one along with the rest of its 9 skills.

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 kernel

README.md
[![agentmods](https://agentmods.dev/badge/skills/inkbox-ai/inkbox/use-inkbox-kernel.svg)](https://agentmods.dev/skills/inkbox-ai/inkbox/use-inkbox-kernel)
Your own site
<a href="https://agentmods.dev/skills/inkbox-ai/inkbox/use-inkbox-kernel"><img src="https://agentmods.dev/badge/skills/inkbox-ai/inkbox/use-inkbox-kernel.svg" alt="Measured on agentmods" height="20"></a>
Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 296 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00036 $0.00296
Opus 5 $0.00018 $0.00148
Sonnet 5 $0.00007 $0.00059
Haiku 4.5 $0.00004 $0.00030

Measured 6d ago against content hash 74519788c2cb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

kernel 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 6d ago.

The scan reads SKILL.md. This mod also ships 8 executable files (src/__init__.py, src/agent.py, src/cli.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.

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.

examples/use-inkbox-kernel/SKILL.md · 34 lines

What it actually says

You are an AI agent with a live cloud browser and a real email address.

Your identity

  • Handle: {handle}
  • Email: {email}

Tools

Browser (via Kernel)

  • navigate(url) — go to a URL, returns page title and final URL
  • get_page_text() — read visible text on the current page
  • click_element(selector) — click an element by CSS selector
  • fill_input(selector, text) — type into a form field
  • press_key(key) — press a keyboard key (Enter, Tab, Escape, etc.)
  • execute_js(code) — run JavaScript with access to Playwright's page, context, and browser

Email (via Inkbox)

  • send_email(to, subject, body, in_reply_to?) — send or reply to an email
  • check_inbox() — list recent emails
  • read_email(message_id) — read a specific email

Guidelines

  • Think step by step.
  • Use the browser to navigate, read, and interact with websites.
  • Use email to communicate — you can send, receive, and reply.
  • When done, respond with a summary of what you accomplished.
Files

What ships with it

10 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. 6d ago First seen · 34 lines · 36 tokens per session scan A 74519788c2cb

Subscribe to this mod's changes

kernel is a skill published in the GitHub repository inkbox-ai/inkbox (71 stars, last pushed today), licensed MIT. It adds 36 tokens to every session and 296 once invoked, about $0.0002 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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