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 aj-geddes/useful-ai-prompts --skill reactive-programminggit clone --depth 1 https://github.com/aj-geddes/useful-ai-promptsWrote 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/aj-geddes/useful-ai-prompts/reactive-programming)<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/reactive-programming"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/reactive-programming/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/aj-geddes/useful-ai-prompts/reactive-programming"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/reactive-programming.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
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 | $0.00042 | $0.00533 |
| Opus 5 | $0.00021 | $0.00267 |
| Sonnet 5 | $0.00008 | $0.00107 |
| Haiku 4.5 | $0.00004 | $0.00053 |
Grade A, and why
reactive-programming scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 97 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Reactive Programming
Table of Contents
Overview
Build responsive applications using reactive streams and observables for handling asynchronous data flows.
When to Use
- Complex async data flows
- Real-time data updates
- Event-driven architectures
- UI state management
- WebSocket/SSE handling
- Combining multiple data sources
Quick Start
Minimal working example:
import {
Observable,
Subject,
BehaviorSubject,
fromEvent,
interval,
} from "rxjs";
import {
map,
filter,
debounceTime,
distinctUntilChanged,
switchMap,
} from "rxjs/operators";
// Create observable from array
const numbers$ = new Observable<number>((subscriber) => {
subscriber.next(1);
subscriber.next(2);
subscriber.next(3);
subscriber.complete();
});
numbers$.subscribe({
next: (value) => console.log(value),
// ... (see reference guides for full implementation)
Reference Guides
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| RxJS Basics | RxJS Basics |
| Search with Debounce | Search with Debounce |
| State Management | State Management |
| WebSocket with Reconnection | WebSocket with Reconnection |
| Combining Multiple Streams | Combining Multiple Streams |
| Backpressure Handling | Backpressure Handling |
| Custom Operators | Custom Operators |
Best Practices
✅ DO
- Unsubscribe to prevent memory leaks
- Use operators to transform data
- Handle errors properly
- Use shareReplay for expensive operations
- Combine streams when needed
- Test reactive code
❌ DON'T
What ships with it
8 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.
- references/backpressure-handling.md 697 B
- references/combining-multiple-streams.md 1.1 KB
- references/custom-operators.md 603 B
- references/rxjs-basics.md 1.2 KB
- references/search-with-debounce.md 958 B
- references/state-management.md 1.7 KB
- references/websocket-with-reconnection.md 1.4 KB
- templates/component-template.tsx 318 B
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.
- 9d ago First seen · 97 lines · 42 tokens per session scan A 39b85c4ed3d7
reactive-programming is a skill published in the GitHub repository aj-geddes/useful-ai-prompts (338 stars, last pushed 6mo ago), licensed MIT. It adds 42 tokens to every session and 533 once invoked, about $0.0002 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.
Other skills, from other repositories
nextjs-pages-router
Set up tRPC in Next.js Pages Router with createNextApiHandler, createTRPCNext, withTRPC HOC, SSR via ssr option and ssrPrepass, SSG via createServerSideHelpers with getStaticProps, and server-side helpers for getServerSideProps prefetching.
with-tanstack-query
Compose Angular Query with signal-owned Table filtering, sorting, and pagination state using reactive query options, manual row-model boundaries, direct query data, server counts, and valid injection context.
auth-web-cloudbase
CloudBase Web Authentication Quick Guide for frontend integration after auth-tool has already been checked. Provides concise and practical Web authentication solutions with multiple login methods and complete user management.
service-digital-engagement-channel-configure
Configures and deploys enhanced chat Messaging Channels for Messaging for In-App and Web (MIAW). Use when the user needs to create, deploy, and activate a messaging channel configured with Omni-Channel Flow, Omni-Channel Queue, User, or Agentforce Service Agent routing. Generates MessagingChannel metadata, deploys it…
pinme-llm
Use this skill when a PinMe project (Worker TypeScript) needs to call OpenRouter-backed LLM APIs, including models, chat/completions, streaming, or OpenRouter web search. Guides AI to generate correct Worker TS code.
om-system-extension
Extend installed Open Mercato modules through UMES enrichers, interceptors, mutation guards, widgets, menus, entity extensions, events, component/page replacements, and overrides. Use for "extend core", "add field/column/action", "hide page", "intercept API", "UMES", or "rozszerz moduł".