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.
npx skills add lexfrei/ccc --skill m4b-audiobookgit clone --depth 1 https://github.com/lexfrei/cccWrote 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.
[](https://agentmods.dev/skills/lexfrei/ccc/m4b-audiobook)<a href="https://agentmods.dev/skills/lexfrei/ccc/m4b-audiobook"><img src="https://agentmods.dev/badge/skills/lexfrei/ccc/m4b-audiobook.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00025 | $0.01353 |
| Opus 5 | $0.00013 | $0.00677 |
| Sonnet 5 | $0.00005 | $0.00271 |
| Haiku 4.5 | $0.00003 | $0.00135 |
Grade A, and why
m4b-audiobook 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 7d 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.
How it starts
The opening of the file, as written. The whole thing — 186 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Assemble a single .m4b audiobook from a directory of audio files. Adds chapter markers, metadata, and cover art.
Prerequisites
ffmpegandffprobemust be installed
Arguments
directory— path to the directory with audio files. If omitted, use the current working directory.
Process
1. Inventory
List all audio files in the directory. Supported formats: .m4a, .mp3, .aac, .ogg, .opus, .flac, .wav.
Also look for a cover image: .jpg, .jpeg, .png files with names suggesting cover art (e.g., cover, folder, front, or any single image file present).
2. Determine file order
Analyze filenames to determine the correct playback order. Common patterns:
- Numeric prefixes:
01 - Title.m4a,1.1. Title.m4a - Chapter/part indicators:
Chapter 1,Part 1,Глава 1,Часть 1 - Structured names:
Week 1. 1.1. Title,Неделя 1. 1.1. Title
Sort rules:
- Group by logical sections (introduction, parts/chapters/weeks, ending/epilogue)
- Within each group, sort by numeric indicators
- Files without clear numbering: sort alphabetically within their group
Present the proposed order to the user. Ask for confirmation before proceeding.
3. Determine metadata
Try to extract metadata from:
- Directory name
- Existing tags in audio files (
ffprobeoutput) - File naming patterns
Required metadata fields:
- title — book title
- artist / album_artist — author name
- album — same as title (convention for audiobooks)
- genre — set to
Audiobook - date — year if determinable from file metadata
- language — detected from content/filenames (e.g.,
rus,eng)
Present proposed metadata to user. Ask for confirmation or corrections.
4. Probe audio formats
Run ffprobe on each file to determine:
- Codec (aac, mp3, flac, etc.)
- Sample rate
- Channels
- Bitrate
If all files share the same codec and parameters: use -c:a copy (no re-encoding — fast and lossless).
If formats differ: re-encode to AAC-LC. Choose parameters:
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.
- 7d ago First seen · 186 lines · 25 tokens per session scan A 1bf79b4cbe24
m4b-audiobook is a skill published in the GitHub repository lexfrei/ccc (10 stars, last pushed 4d ago), licensed BSD-3-Clause. It adds 25 tokens to every session and 1,353 once invoked, about $0.0001 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 2026-08-31.
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