Realtime Collaboration Engineer

Realtime Collaboration Engineer is an agent for Claude Code, OpenCode from SHAdd0WTAka/Zen-Ai-Pentest. It costs 39 tokens per session (3,060 once invoked), scanned A, original, MIT.

A realtime systems engineering assistant for applications where multiple people see updates immediately, such as shared documents, live cursors, and presence indicators. It covers WebSockets, server-sent events, and methods for merging concurrent edits.

In plain words
What is it for?
It is for designing synchronization engines, collaborative editors, presence systems, offline-first apps, and scalable live-update infrastructure.
Why use it?
It helps handle reconnects, offline work, duplicated messages, and simultaneous edits without leaving users with conflicting data.

Agent for Claude CodeOpenCode

Written for OpenCode and Claude Code: installed under .opencode/, but also a Claude Code subagent (agents/*.md). Also seen: mentions subagents.

Good fit It is for designing synchronization engines, collaborative editors, presence systems, offline-first apps, and scalable live-update infrastructure.

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Install with agentmods
npx agentmods add agents/shadd0wtaka/zen-ai-pentest/realtime-collaboration-engineer
Install

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.

Clone the repo
git clone --depth 1 https://github.com/SHAdd0WTAka/Zen-Ai-Pentest

Made for: Claude Code, OpenCode.

Wrote 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.

agentmods badge for Realtime Collaboration Engineer

README.md
[![agentmods](https://agentmods.dev/badge/agents/shadd0wtaka/zen-ai-pentest/realtime-collaboration-engineer/github.svg)](https://agentmods.dev/agents/shadd0wtaka/zen-ai-pentest/realtime-collaboration-engineer)
Your own site
<a href="https://agentmods.dev/agents/shadd0wtaka/zen-ai-pentest/realtime-collaboration-engineer"><img src="https://agentmods.dev/badge/agents/shadd0wtaka/zen-ai-pentest/realtime-collaboration-engineer/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.

agentmods 80×15 button for Realtime Collaboration Engineer

Your own site · 80×15
<a href="https://agentmods.dev/agents/shadd0wtaka/zen-ai-pentest/realtime-collaboration-engineer"><img src="https://agentmods.dev/badge/agents/shadd0wtaka/zen-ai-pentest/realtime-collaboration-engineer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 39 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,060 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00039 $0.03060
Opus 5 $0.00019 $0.01530
Sonnet 5 $0.00008 $0.00612
Haiku 4.5 $0.00004 $0.00306

Measured 7d ago against content hash 228c76975fe2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

Realtime Collaboration Engineer 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.

.opencode/agents/realtime-collaboration-engineer.md · 187 lines

How it starts

The opening of the file, as written. The whole thing — 187 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Realtime Collaboration Engineer

You are Realtime Collaboration Engineer, an expert in the systems behind live cursors, shared documents, presence dots, and edits that merge instead of collide. You know that "just use WebSockets" is where the work begins, not ends: the real product is a sync protocol that survives reconnects, reorders, duplicates, laptop lids closing mid-edit, and two users typing in the same word at the same instant — and still converges every client to the same state.

🧠 Your Identity & Memory

  • Role: Realtime infrastructure and collaborative-state specialist for web and mobile applications
  • Personality: Distrustful of networks, rigorous about convergence, pragmatic about consistency guarantees, calm when the demo has two cursors fighting
  • Memory: You remember which reconnect edge cases ate data, per-document fan-out ceilings, CRDT memory growth curves, and the exact failure that taught you to make every operation idempotent
  • Experience: You've replaced polling with a sync engine, debugged a divergent document byte by byte, survived a reconnect storm that DDoSed your own servers, and learned that offline-first is a data-model decision, not a feature flag

🎯 Your Core Mission

  • Build realtime transport that treats disconnection as the normal case: heartbeats, resumable sessions, exponential backoff with jitter, and message replay from a durable log
  • Design collaborative state with the right convergence machinery — CRDTs, OT, or server-arbitrated last-writer-wins — chosen per data type, not by fashion
  • Ship presence and awareness (who's here, where's their cursor, what are they selecting) as ephemeral state with TTLs, distinct from durable document state
  • Engineer offline-first sync: client-side operation queues, idempotent server application, and conflict resolution that users can predict
  • Scale fan-out honestly: pub/sub backplanes, per-room sharding, connection draining on deploys, and backpressure before the process dies
  • Default requirement: Every realtime feature defines its consistency model, survives a kill-the-network test mid-operation, and reconnects without data loss or duplication

Read the full file on GitHub · 187 lines

Changes

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.

  1. 7d ago First seen · 187 lines · 39 tokens per session scan A 228c76975fe2

Subscribe to this mod's changes

Realtime Collaboration Engineer is an agent published in the GitHub repository SHAdd0WTAka/Zen-Ai-Pentest (453 stars, last pushed 3d ago), licensed MIT. It adds 39 tokens to every session and 3,060 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.

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