What is kobox CLAUDE.md?

Setup instructions for connecting Claude Code to kobox, a local server that controls a Teenage Engineering EP-133 K.O. II music device over USB MIDI.

Installing kobox in its project folder, adding it to Claude Code, checking that it connects, and confirming that the K.O. II is visible.

They reduce setup mistakes by specifying the environment, installation, registration, and connection checks.

How yangyue1974/kobox configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to yangyue1974/kobox. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/yangyue1974/kobox/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/yangyue1974/kobox

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/yangyue1974/kobox/claude-md/github.svg)](https://agentmods.dev/instructions/yangyue1974/kobox/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/yangyue1974/kobox/claude-md"><img src="https://agentmods.dev/badge/instructions/yangyue1974/kobox/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/yangyue1974/kobox/claude-md"><img src="https://agentmods.dev/badge/instructions/yangyue1974/kobox/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 483 This file is loaded in full into every session.

When invoked 483 The same file — it is already loaded in full.

Security scan C 2 findings. 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.

Model	Per session	Once invoked
Fable 5.1	$0.00483	$0.00483
Opus 5	$0.00242	$0.00242
Sonnet 5	$0.00097	$0.00097
Haiku 4.5	$0.00048	$0.00048

Measured 8d ago against content hash ac915c4eddda, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade C, and why

kobox CLAUDE.md scanned grade C with 2 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 8d 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

If `uv` is not installed, install it first: `curl -LsSf https://astral.sh/uv/install.sh | sh`

Makes network callslowCapability

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

If `uv` is not installed, install it first: `curl -LsSf https://astral.sh/uv/install.sh | sh`

CLAUDE.md · 47 lines

What it actually says

Installing kobox (instructions for Claude Code)

You are installing kobox, an MCP server that controls a Teenage Engineering EP-133 K.O. II over MIDI. Follow these steps exactly. Do not skip verification.

Steps

Ensure you are in the cloned kobox repo directory. If the user only gave you a GitHub URL, clone it first into a sensible location and cd into it.
Create an isolated environment and install pinned dependencies:
```
uv venv .venv
uv pip install --python .venv/bin/python -e .
```
If uv is not installed, install it first: curl -LsSf https://astral.sh/uv/install.sh | sh
Register the server with Claude Code at user scope (available in all projects). Use the ABSOLUTE path to the venv's console script:
```
claude mcp add kobox --scope user -- "$(pwd)/.venv/bin/kobox"
```
Verify the server connects:
```
claude mcp get kobox
```
Expected: Status: ✓ Connected.
Verify MIDI works and the device is visible (device must be plugged in via USB):
```
.venv/bin/python -c "import mido; print('outputs:', mido.get_output_names())"
```
Expected: a list including EP-133. If the list is empty or lacks EP-133, tell the user to connect the K.O. II via USB and power it on, then re-run this step.
Tell the user to RESTART Claude Code so the kobox tools load, then they can say "connect to my K.O. II" to begin.

Troubleshooting

No module named 'rtmidi' / no sound: dependencies didn't install; re-run step 2.
EP-133 not found: device not plugged in / powered on, or another app holds the MIDI port. Close other MIDI apps and re-run step 5.
claude: command not found: the user is not in Claude Code. See README for the Claude Desktop path.

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.

8d ago First seen · 47 lines · 483 tokens per session scan C ac915c4eddda

Subscribe to this mod's changes

kobox CLAUDE.md is an instructions file published in the GitHub repository yangyue1974/kobox (3 stars, last pushed 2mo ago), licensed MIT. It adds 483 tokens to every session, about $0.0024 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Creative and media Hardware and IoT claude ep-133 mcp midi model-context-protocol music

next.js AGENTS.md

AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.

vercel/next.js · 7,296 tokens

codex AGENTS.md

AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.

openai/codex · 5,153 tokens

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 6,785 tokens

kobox: Instructions file for Claude Code