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 systemoperators/claude-plugins --skill altoindexgit clone --depth 1 https://github.com/systemoperators/claude-pluginsWrote 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/systemoperators/claude-plugins/altoindex)<a href="https://agentmods.dev/skills/systemoperators/claude-plugins/altoindex"><img src="https://agentmods.dev/badge/skills/systemoperators/claude-plugins/altoindex/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.
<a href="https://agentmods.dev/skills/systemoperators/claude-plugins/altoindex"><img src="https://agentmods.dev/badge/skills/systemoperators/claude-plugins/altoindex.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00052 | $0.01367 |
| Opus 5.5 | $0.00021 | $0.00547 |
| Sonnet 5.5 | $0.00010 | $0.00273 |
| Haiku 4.5 | $0.00005 | $0.00137 |
Grade A, and why
altoindex 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.
How it starts
The opening of the file, as written. The whole thing — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.
alto.index Data
alto.index is a macOS app that syncs data from Apple apps to ~/Documents/alto-index/ as markdown files. This skill teaches you how to work with the synced data.
Base Path
All data lives in ~/Documents/alto-index/. Each data source has its own subfolder with a CLAUDE.md containing source-specific details. Always read the relevant CLAUDE.md first when working with a source you haven't seen yet.
Native App Links
Most exported files contain deep links back to the original item in the native macOS app. When referencing any item, always include the native link so the user can click through to the source app. The link is typically in the frontmatter link or source field, or at the bottom of the file body. Supported link schemes: notes://, x-apple-reminder://, addressbook://, calshow:.
Data Sources
notes/
Apple Notes exported as markdown files.
- path:
notes/{folder}/{title}.md - folders match Apple Notes folder names, nested folders supported
- frontmatter: title, id, created, modified, folder, attachments, links, source
- deep link:
notes://showNote?identifier={uuid}(insourcefield) - body contains the note content in markdown, with a link back to the original note at the bottom
reminders/
Apple Reminders (active/non-completed only).
- path:
reminders/{list}/{title}.md - lists match Apple Reminders list names
- frontmatter: title, reminder_id, list, priority (none/low/medium/high), flagged, url, images, created_date, modified_date, link
- deep link:
x-apple-reminder://{reminder_id}(inlinkfield) - body may contain URLs and images sections
calendar/
Apple Calendar events.
- path:
calendar/{calendar-name}/{YYYY-MM-DD}/{event}.md - organized by calendar name, then by date
- frontmatter: title, event_id, calendar, start_date, end_date, all_day, location, url, organizer, attendees (list with name/status/role), status, availability, alarms, recurrence, created_date, modified_date, link
- deep link:
calshow:{timeIntervalSinceReferenceDate}(inlinkfield) - body includes time/location info, notes, and attendee list
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 First seen · 141 lines · 52 tokens per session scan A 17870e4fe388
altoindex is a skill published in the GitHub repository systemoperators/claude-plugins (6 stars, last pushed 8mo ago), licensed MIT. It adds 52 tokens to every session and 1,367 once invoked, about $0.0002 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.
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