v86

v86 is a skill for Claude Code from ai-ecoverse/slicc. It costs 56 tokens per session (1,380 once invoked), scanned A, original, Apache-2.0.

A guide to v86, a tool that runs x86 virtual machines in WebAssembly. It explains how to install its engine, provide BIOS and guest images, boot systems, interact with them, and save or restore machine state.

In plain words
What is it for?
Use it to boot ISO files, disks, floppies, or Linux kernels; inspect or control running guests; take screenshots; type or use the mouse; and save or restore VM snapshots.
Why use it?
It documents the required files and commands for running a virtual machine and makes the boot and interaction steps repeatable.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Good fit Use it to boot ISO files, disks, floppies, or Linux kernels; inspect…

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Install with agentmods
npx agentmods add skills/ai-ecoverse/slicc/v86
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 ai-ecoverse/slicc --skill v86
Clone the repo
git clone --depth 1 https://github.com/ai-ecoverse/slicc

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 v86

README.md
[![agentmods](https://agentmods.dev/badge/skills/ai-ecoverse/slicc/v86.svg)](https://agentmods.dev/skills/ai-ecoverse/slicc/v86)
Your own site
<a href="https://agentmods.dev/skills/ai-ecoverse/slicc/v86"><img src="https://agentmods.dev/badge/skills/ai-ecoverse/slicc/v86.svg" alt="Measured on agentmods" height="20"></a>
Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,380 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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 $0.00056 $0.01380
Opus 5 $0.00028 $0.00690
Sonnet 5 $0.00011 $0.00276
Haiku 4.5 $0.00006 $0.00138

Measured yesterday against content hash 8930107945b3, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

v86 scanned grade A with 1 finding 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 yesterday.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -o /workspace/.v86/seabios.bin https://raw.githubusercontent.com/copy/v86/master/bios/seabios.bin
packages/vfs-root/workspace/skills/v86/SKILL.md · 96 lines

How it starts

The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.

v86 virtual machines

The v86 shell command boots x86 guests (ISO, raw disk, floppy, or direct Linux kernel) on the v86 wasm engine. Nothing is bundled: install the engine first, then supply BIOS blobs and a guest image as VFS files.

Install prerequisites

ipk add -g [email protected]
mkdir -p /workspace/.v86
curl -o /workspace/.v86/seabios.bin https://raw.githubusercontent.com/copy/v86/master/bios/seabios.bin
curl -o /workspace/.v86/vgabios.bin https://raw.githubusercontent.com/copy/v86/master/bios/vgabios.bin

There is no CDN fallback; missing pieces produce an actionable error with these exact commands.

Boot and lifecycle

v86 start -cdrom alpine.iso              # boot an ISO (prints pid)
v86 start -n dos -fda freedos.img -m 64  # named VM, floppy boot, 64 MiB RAM
v86 start -kernel bzImage -initrd rootfs.img -append "console=ttyS0" -nographic
v86 ls                                   # list running VMs
v86 stop [-n name] [--force]             # power off
v86 state [-n name] save|load <file>     # snapshot / restore full VM state

Arch Linux (copy.sh demo image)

The fastest full-Linux guest is the pre-booted Arch state image from copy.sh (the same one behind https://copy.sh/v86/?profile=archlinux). It resumes straight into a root shell — no BIOS blobs, no boot wait:

curl -o "$TMPDIR/arch_state.bin.zst" https://i.copy.sh/arch_state-v3.bin.zst   # ~15 MB
v86 start -n arch -state "$TMPDIR/arch_state.bin.zst" -fs9p https://i.copy.sh/arch/ -net virtio -m 512
v86 text -n arch                         # should show a root@localhost prompt
v86 type -n arch "uname -a\n"
v86 text -n arch

-state resumes a snapshot (.zst decompresses inside the engine), -fs9p attaches the network-backed 9p root the guest's files live on (fetched on demand, host must send CORS headers), and -net virtio matches the NIC the snapshot was saved with.

Guest networking (fetch relay)

-net <model>,relay=fetch gives the guest outbound HTTP without a gateway: v86's fetch relay answers guest DNS in-engine and turns guest port-80 connections into host fetches, which SLICC reroutes through its CORS-bypassing fetch proxy. Plain-http requests to external hosts are upgraded to https before hitting the proxy (http://localhost stays local).

Read the full file on GitHub · 96 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. yesterday First seen · 96 lines · 56 tokens per session scan A 8930107945b3

Subscribe to this mod's changes

v86 is a skill published in the GitHub repository ai-ecoverse/slicc (30 stars, last pushed yesterday), licensed Apache-2.0. It adds 56 tokens to every session and 1,380 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-05.

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