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 agentmods add skills/causify-ai/helpers/book.update_contentnpx skills add causify-ai/helpers --skill book.update_contentgit clone --depth 1 https://github.com/causify-ai/helpersWrote 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/causify-ai/helpers/book.update_content)<a href="https://agentmods.dev/skills/causify-ai/helpers/book.update_content"><img src="https://agentmods.dev/badge/skills/causify-ai/helpers/book.update_content.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 | $0.00014 | $0.00259 |
| Opus 5 | $0.00007 | $0.00130 |
| Sonnet 5 | $0.00003 | $0.00052 |
| Haiku 4.5 | $0.00001 | $0.00026 |
Grade A, and why
book.update_content 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 today.
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.
What it actually says
-
Given the content of a book in the form of a markdown or tex file
<TARGET>and a source file<SOURCE>, find and incorporate the changes from<SOURCE>into<TARGET> -
The file
<SOURCE>contains a header with the last version, in terms of Git hash and timestamp, of the material used to generate the current version of<TARGET>- E.g.,
% git_hash=<GIT_HASH>, timestamp=<TIMESTAMP> % <SOURCE> - E.g.,
% git_hash=f15bc6b9, timestamp=2026-07-15 14:41:12 EDT % book_springer/lectures_source/Lesson02.1_From_Data_Science_To_Decision_Science.txt
- E.g.,
-
Find what changed in
<SOURCE>from<GIT_HASH>to now, and modify<TARGET>to incorporate those changes -
Follow the same style as
<TARGET>(e.g., read the corresponding.claude/skills/*.rules.md)
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.
- today Changed e3107decd1be
- 3d ago First seen · 29 lines · 14 tokens per session scan A daf7c181f42e
book.update_content is a skill published in the GitHub repository causify-ai/helpers (145 stars, last pushed today), licensed Apache-2.0. It adds 14 tokens to every session and 259 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 2026-08-30.
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