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/axiomantic/spellbook/documentation-updatesnpx skills add axiomantic/spellbook --skill documentation-updatesgit clone --depth 1 https://github.com/axiomantic/spellbookWrote 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/axiomantic/spellbook/documentation-updates)<a href="https://agentmods.dev/skills/axiomantic/spellbook/documentation-updates"><img src="https://agentmods.dev/badge/skills/axiomantic/spellbook/documentation-updates.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 | $0.00026 | $0.00512 |
| Opus 5 | $0.00013 | $0.00256 |
| Sonnet 5 | $0.00005 | $0.00102 |
| Haiku 4.5 | $0.00003 | $0.00051 |
Grade A, and why
documentation-updates 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.
How it starts
The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Documentation Updates
Invariant Principles
- Library changes require documentation trail - Every modification to installed content must be traceable through CHANGELOG
- Counts must match reality - README totals reflect actual files, never stale
- Generated docs stay fresh - Run generator after any library content change
- Repo skills are invisible - Internal tooling never touches external docs
Required Updates Matrix
| Change | CHANGELOG | README | Docs Generator |
|---|---|---|---|
| Add library skill | "Added" section | count++, add table row, add link ref | Run |
| Modify library skill | "Changed" section | Only if description changed | Run |
| Remove library skill | "Removed" section | count--, remove row/link | Run |
| Add/modify command | Appropriate section | Update if count/description affected | Run |
Verification Checklist
- CHANGELOG.md has entry under
## [Unreleased] - README.md counts match
ls skills/*/SKILL.md | wc -landls commands/*.md | wc -l - New items have table rows AND link references
-
python3 scripts/generate_docs.pyexecuted - Pre-commit hooks committed generated files
CHANGELOG Entry Format
## [Unreleased]
### Added
- **skill-name skill** - one-line description
- Notable feature bullet
### Changed
- **skill-name skill** - what changed and why
### Removed
- **skill-name skill** - removal rationale
README Link Reference Pattern
[skill-name]: https://axiomantic.github.io/spellbook/latest/skills/skill-name/
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.
- 4d ago First seen · 67 lines · 26 tokens per session scan A 845c36602cf2
documentation-updates is a skill published in the GitHub repository axiomantic/spellbook (10 stars, last pushed today), licensed MIT. It adds 26 tokens to every session and 512 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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