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kerf: Instructions file for Claude Code

CLAUDE.md

kerf CLAUDE.md is an instructions file for Claude Code from OrellBuehler/kerf. It costs 3,340 tokens per session, scanned A, original, no licence file.

A set of coding instructions for kerf, including an introduction to its ffmpeg feature. FFmpeg is software commonly used to process audio and video.

In plain words
What is it for?
Working on kerf’s media-processing feature, running common commands, and changing its engine or export graph.
Why use it?
It tells the coding agent what to read first, which commands to use, and how the engine and export graph fit together.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is OrellBuehler/kerf's own configuration. It tells Claude Code how to work on kerf itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything kerf configures →

not rated 12repo +2 changed 4d ago A scan 3,340 tokens custom licence
View source ↗ OrellBuehler/kerf orellbuehler.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to OrellBuehler/kerf. 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/OrellBuehler/kerf/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/OrellBuehler/kerf

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 kerf CLAUDE.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/orellbuehler/kerf/claude-md/github.svg)](https://agentmods.dev/instructions/orellbuehler/kerf/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/orellbuehler/kerf/claude-md"><img src="https://agentmods.dev/badge/instructions/orellbuehler/kerf/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.

agentmods 80×15 button for kerf CLAUDE.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/orellbuehler/kerf/claude-md"><img src="https://agentmods.dev/badge/instructions/orellbuehler/kerf/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 3,340 This file is loaded in full into every session.
When invoked 3,340 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.03340 $0.03340
Opus 5.5 $0.01336 $0.01336
Sonnet 5.5 $0.00668 $0.00668
Haiku 4.5 $0.00334 $0.00334

Measured 4d ago against content hash c13e070a9b5b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

kerf 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 4d 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 · 175 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

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.

  1. 4d ago Changed · +16 tokens per session c13e070a9b5b
  2. 5d ago Changed · +1 lines · +24 tokens per session bb892335e7c0
  3. 9d ago Changed · +10 tokens per session 3da8273852e0
  4. 12d ago Changed · +4 lines · +106 tokens per session d86a03fbff12
  5. 15d ago Changed · +1 lines · +30 tokens per session 24b18675acea
  6. 19d ago Changed · +12 lines · +338 tokens per session 9ab4603e3fc8
  7. 29d ago Changed · -1,208 lines · -23,312 tokens per session 40c6a4b1f429
  8. 1mo ago Changed · +207 lines · +4,433 tokens per session e135c974b1f4
  9. 1mo ago Changed · +27 lines · +479 tokens per session 3e859757cfe8
  10. 1mo ago First seen · 1,131 lines · 21,216 tokens per session scan A 1d0d0c1cfc3c

Subscribe to this mod's changes

kerf CLAUDE.md is an instructions file published in the GitHub repository OrellBuehler/kerf (12 stars, last pushed yesterday), with no licence file. It adds 3,340 tokens to every session, about $0.0134 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 2026-08-31.

LLMaiai-video-editingclaudedesktop-appffmpeg
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