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/tonyghiani/ai-essentials/typescript-stylegit clone --depth 1 https://github.com/tonyghiani/ai-essentialsWhat 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 | $0.00831 |
| Opus 5 | $0.00000 | $0.00415 |
| Sonnet 5 | $0.00000 | $0.00166 |
| Haiku 4.5 | $0.00000 | $0.00083 |
Grade A, and why
typescript-style 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 2d 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 — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Project conventions win. Read the neighbouring files first; apply these where a project has no established convention of its own.
Naming
❌ const d = users.filter(u => u.active) ❌ const rc = clientMock() ✅ const activeUsers = users.filter((user) => user.active) ✅ const rulesClient = clientMock() ❌ const disabled = !status ❌ const refetchInterval = 30000 ✅ const isDisabled = !status ✅ const REFETCH_INTERVAL_MS = 30_000
is/has for state, should/can for intent. assert* throws, get* is cheap and sync, fetch*
hits the network, resolve* is multi-step, create*/make* is a factory. Props take onX, the
internal handler takes handleX.
Types
❌ enum Reason { License = 'license' } ✅ type TReason = 'license' | 'pricing_tier' ✅ const REASONS = ['license', 'pricing_tier'] as const // only when the runtime list is needed type TReason = (typeof REASONS)[number]
✅ interface IChecklist {} type TChecklistSlug = string
I on interfaces, T on type aliases. Reach for interface wherever it can substitute a type.
❌ const entry = value as MemoryEntry
✅ function isMemoryEntry(value: unknown): value is IMemoryEntry {}
any is banned, tests included. @ts-expect-error needs an inline reason; @ts-ignore never.
❌ if (reason === 'license') {} else if (reason === 'pricing_tier') {} ✅ const MESSAGES: Record<TReason, () => string> = { license: () => '', pricing_tier: () => '' } // Keying by reason makes this exhaustive: TypeScript errors if a reason lacks a message.
Explicit return types on exported server functions, factories, route handlers, and hooks returning a
wide or nullable object. Inferred elsewhere. Generics only where they remove an unsafe cast.
null means explicitly absent; undefined means not provided.
Control flow
❌ for (let i = 0; i < items.length; i++) { ids.push(items[i].id) } ✅ const ids = items.map((item) => item.id) Declarative by default. An imperative loop is a performance escape hatch; say why in a comment.
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.
- 2d ago First seen · 77 lines · 0 tokens per session scan A 7af86402e5f9
typescript-style is a cursor rule published in the GitHub repository tonyghiani/ai-essentials (6 stars, last pushed 24d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 831 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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