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 rules/heavyblotto/caelus/copygit clone --depth 1 https://github.com/heavyblotto/caelusWhat 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 | $0.00000 | $0.00365 |
| Opus 5 | $0.00000 | $0.00182 |
| Sonnet 5 | $0.00000 | $0.00073 |
| Haiku 4.5 | $0.00000 | $0.00036 |
Grade A, and why
copy 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 yesterday.
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
Copy and prose (Caelus)
Before editing user-facing text, read docs/editorial-voice.md and docs/ai-slop-style-sheet.md.
Voice
- Dry engineer, not pitch deck. Facts and measurements over adjectives.
- Short sentences. Name sources and numbers.
- No manifesto lines, mic-drops, or performed wit ("full stop", "mail to Zurich", "every layer needs its own referee").
Banned patterns
- AI filler: delve, unpack, landscape, tapestry, testament, resonates, pivotal, holistic, "it's important to note"
- Meta: "the lesson generalizes", "what this buys you", "cannot hide inside it", "the actual asset"
- Em-dash chains — prefer comma, colon, or a new sentence
Workflow
- Edit copy in
apps/web/ordocs/. - Run
npm run lint:proseand fix warnings. - Do not rewrite package API docs or golden test commentary unless asked.
Terminology
- Caelus (capitalized) for the project/engine in prose
caelus(lowercase) for the npm package name, imports (from "caelus"), andnpm install caelus- Title case for page headings and nav labels
- Emoji only in the home-page hero bullets and CTA labels; nowhere else
Swiss Ephemerisas oracle/referee, never as source codeclean-roomsparingly; prefer "written from published sources"
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.
- yesterday First seen · 37 lines · 0 tokens per session scan A c3ffad48e762
copy is a cursor rule published in the GitHub repository heavyblotto/caelus (0 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 365 tokens. 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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