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 fellipeutaka/leon --skill tanstack-pacergit clone --depth 1 https://github.com/fellipeutaka/leonWrote 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/fellipeutaka/leon/tanstack-pacer)<a href="https://agentmods.dev/skills/fellipeutaka/leon/tanstack-pacer"><img src="https://agentmods.dev/badge/skills/fellipeutaka/leon/tanstack-pacer/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/fellipeutaka/leon/tanstack-pacer"><img src="https://agentmods.dev/badge/skills/fellipeutaka/leon/tanstack-pacer.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 | $0.00062 | $0.01515 |
| Opus 5 | $0.00031 | $0.00758 |
| Sonnet 5 | $0.00012 | $0.00303 |
| Haiku 4.5 | $0.00006 | $0.00152 |
Grade A, and why
tanstack-pacer 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 7d 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 — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.
TanStack Pacer
Version: @tanstack/react-pacer@latest Requires: React 16.8+, TypeScript recommended
Quick Setup
npm install @tanstack/react-pacer
import { useDebouncedCallback } from '@tanstack/react-pacer'
function SearchInput() {
const debouncedSearch = useDebouncedCallback(
(query: string) => fetchResults(query),
{ wait: 300 },
)
return <input onChange={(e) => debouncedSearch(e.target.value)} />
}
4 Hook Variants Per Utility
Each utility (Debouncer, Throttler, RateLimiter, Queuer, Batcher) provides 4 React hooks:
| Hook | Returns | Use Case |
|---|---|---|
use[Utility] |
Instance | Full control, custom state subscriptions |
use[Utility]Callback |
Wrapped function | Simple event handler wrapping |
use[Utility]State |
[value, setValue, instance] |
Debounced/throttled React state |
use[Utility]Value |
[derivedValue, instance] |
Read-only derived value from props/state |
PacerProvider (Optional)
import { PacerProvider } from '@tanstack/react-pacer'
<PacerProvider
defaultOptions={{
debouncer: { wait: 300 },
throttler: { wait: 200 },
}}
>
<App />
</PacerProvider>
Devtools
npm install -D @tanstack/react-devtools @tanstack/react-pacer-devtools
import { TanStackDevtools } from '@tanstack/react-devtools'
import { pacerDevtoolsPlugin } from '@tanstack/react-pacer-devtools'
<TanStackDevtools plugins={[pacerDevtoolsPlugin()]} />
Utilities must have a key option to appear in devtools.
Rule Categories
| Priority | Category | Rule File | Impact |
|---|---|---|---|
| CRITICAL | Hook Selection | rules/hook-selection.md |
Correct hook choice per use case |
| CRITICAL | Debouncing | rules/deb-debouncing.md |
Prevents wasted API calls and flickering UI |
| HIGH | Throttling | rules/thr-throttling.md |
Smooth, evenly-spaced execution |
| HIGH | State & Reactivity | rules/state-reactivity.md |
Prevents unnecessary re-renders |
| HIGH | Async Patterns | rules/async-patterns.md |
Correct async execution with retry, abort, error handling |
| MEDIUM | Rate Limiting | rules/rl-rate-limiting.md |
Enforces execution budgets |
| MEDIUM | Queuing | rules/que-queuing.md |
Lossless ordered/priority task processing |
| MEDIUM | Batching | rules/bat-batching.md |
Groups operations for bulk processing |
| LOW | Configuration | rules/config-options.md |
Dynamic options, providers, shared config |
| LOW | Devtools | rules/devtools.md |
Debugging and monitoring utilities |
What ships with it
11 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- agents/openai.yaml 202 B
- rules/async-patterns.md 2.2 KB
- rules/bat-batching.md 2.3 KB
- rules/config-options.md 2.0 KB
- rules/deb-debouncing.md 2.0 KB
- rules/devtools.md 1.4 KB
- rules/hook-selection.md 2.4 KB
- rules/que-queuing.md 2.1 KB
- rules/rl-rate-limiting.md 2.2 KB
- rules/state-reactivity.md 1.8 KB
- rules/thr-throttling.md 1.8 KB
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.
- 7d ago First seen · 167 lines · 62 tokens per session scan A 79c701f3ed62
tanstack-pacer is a skill published in the GitHub repository fellipeutaka/leon (5 stars, last pushed 7d ago), licensed MIT. It adds 62 tokens to every session and 1,515 once invoked, about $0.0003 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 2026-09-03.
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