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 curiositech/some_claude_skills --skill real-time-collaboration-enginegit clone --depth 1 https://github.com/curiositech/some_claude_skillsWrote 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/curiositech/some_claude_skills/real-time-collaboration-engine)<a href="https://agentmods.dev/skills/curiositech/some_claude_skills/real-time-collaboration-engine"><img src="https://agentmods.dev/badge/skills/curiositech/some_claude_skills/real-time-collaboration-engine/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/curiositech/some_claude_skills/real-time-collaboration-engine"><img src="https://agentmods.dev/badge/skills/curiositech/some_claude_skills/real-time-collaboration-engine.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector 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 | $0.00088 | $0.03357 |
| Opus 5 | $0.00044 | $0.01679 |
| Sonnet 5 | $0.00018 | $0.00671 |
| Haiku 4.5 | $0.00009 | $0.00336 |
Grade A, and why
real-time-collaboration-engine 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 8d 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 — 562 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Real-Time Collaboration Engine
Expert in building Google Docs-style collaborative editing with WebSockets, conflict resolution, and presence awareness.
When to Use
✅ Use for:
- Collaborative text/code editors
- Shared whiteboards and design tools
- Multi-user video editing timelines
- Real-time data dashboards
- Multiplayer game state sync
❌ NOT for:
- Simple chat applications (use basic WebSocket)
- Request-response APIs (use REST/GraphQL)
- Single-user applications
- Read-only data streaming (use Server-Sent Events)
Quick Decision Tree
Need real-time collaboration?
├── Text editing? → Operational Transform (OT)
├── JSON data structures? → CRDTs
├── Cursor tracking only? → Simple WebSocket + presence
├── Offline-first? → CRDTs (better offline merge)
└── No conflicts possible? → Basic broadcast
Technology Selection
Conflict Resolution Strategies (2024)
| Strategy | Best For | Complexity | Offline Support |
|---|---|---|---|
| Operational Transform (OT) | Text, ordered sequences | High | Limited |
| CRDTs | JSON objects, sets | Medium | Excellent |
| Last-Write-Wins | Simple state | Low | Basic |
| Three-Way Merge | Git-style editing | High | Good |
Timeline:
- 2010: Google Wave uses OT
- 2014: Figma adopts CRDTs
- 2019: Yjs (CRDT library) released
- 2022: Automerge 2.0 (CRDT library) released
- 2024: PartyKit simplifies real-time infrastructure
Common Anti-Patterns
Anti-Pattern 1: Broadcasting Every Keystroke
Novice thinking: "Send every change immediately for real-time feel"
Problem: Network floods with tiny messages, poor performance.
Wrong approach:
// ❌ Sends message on every keystroke
function Editor() {
const handleChange = (text: string) => {
socket.emit('text-change', { text }); // Every keystroke!
};
return <textarea onChange={(e) => handleChange(e.target.value)} />;
}
Why wrong: 100 WPM typing = 500 messages/minute = network congestion.
What ships with it
5 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.
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.
- 8d ago First seen · 562 lines · 88 tokens per session scan A bcf60102917e
real-time-collaboration-engine is a skill published in the GitHub repository curiositech/some_claude_skills (219 stars, last pushed 5d ago), licensed MIT. It adds 88 tokens to every session and 3,357 once invoked, about $0.0004 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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