What is ultrapack CLAUDE.md?

Repository instructions for Ultrapack, including its folder layout, naming rules, design principles, and versioning guidance. The available text does not explain what Ultrapack itself does.

Navigating the repository and making changes that match its layout, naming, design, and release-version rules.

It helps an AI coding assistant follow the repository's conventions and avoid inconsistent changes, but the input does not identify a specific problem it removes.

How btseytlin/ultrapack configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to btseytlin/ultrapack. 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/btseytlin/ultrapack/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/btseytlin/ultrapack

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/btseytlin/ultrapack/claude-md/github.svg)](https://agentmods.dev/instructions/btseytlin/ultrapack/claude-md)

Your own site

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

Per session 529 This file is loaded in full into every session.

When invoked 529 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00529	$0.00529
Opus 5.5	$0.00212	$0.00212
Sonnet 5.5	$0.00106	$0.00106
Haiku 4.5	$0.00053	$0.00053

Measured 1mo ago against content hash d493d3c4126d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ultrapack CLAUDE.md 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 1mo 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.

CLAUDE.md · 30 lines

The source is not reproduced here

Licensed WTFPL

The repository is licensed WTFPL, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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.

1mo ago Changed · +12 tokens per session d493d3c4126d
2mo ago Changed · +26 tokens per session 03fd0e4df0cb
2mo ago First seen · 30 lines · 491 tokens per session scan A 89d8e3451592

Subscribe to this mod's changes

ultrapack CLAUDE.md is an instructions file published in the GitHub repository btseytlin/ultrapack (47 stars, last pushed 24d ago), licensed WTFPL. It adds 529 tokens to every session, about $0.0021 per session on Opus 5.5. 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.

ultrapack CLAUDE.md next to 6 instructions from other repositories
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ultrapack CLAUDE.mdbtseytlin/ultrapack	Instructions file	47	24d ago	WTFPL	A	529	Claude Code
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ultrapack: Instructions file for Claude Code