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 Bbeierle12/Skill-MCP-Claude --skill multiplayer-buildinggit clone --depth 1 https://github.com/Bbeierle12/Skill-MCP-ClaudeWrote 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/bbeierle12/skill-mcp-claude/multiplayer-building)<a href="https://agentmods.dev/skills/bbeierle12/skill-mcp-claude/multiplayer-building"><img src="https://agentmods.dev/badge/skills/bbeierle12/skill-mcp-claude/multiplayer-building/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/bbeierle12/skill-mcp-claude/multiplayer-building"><img src="https://agentmods.dev/badge/skills/bbeierle12/skill-mcp-claude/multiplayer-building.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 | $0.00040 | $0.00314 |
| Opus 5.5 | $0.00016 | $0.00126 |
| Sonnet 5.5 | $0.00008 | $0.00063 |
| Haiku 4.5 | $0.00004 | $0.00031 |
Grade A, and why
multiplayer-building 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 1mo 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.
What it actually says
Multiplayer Building
Networking layer for multiplayer building games.
Quick Start
import { BuildingNetworkServer, BuildingNetworkClient } from './scripts/building-network-manager.js';
// Server
const server = new BuildingNetworkServer(buildingSystem, {
tickRate: 20,
conflictStrategy: 'first_write'
});
server.start();
// Client
const client = new BuildingNetworkClient(buildingSystem);
client.connect('ws://server:8080');
const localPiece = client.placeRequest('wall', position, rotation);
Reference
See references/multiplayer-networking.md for:
- Authority model comparison
- Delta compression strategy
- Conflict resolution approaches
- Large structure synchronization
Scripts
scripts/delta-compression.js- Only sync changed state (Source engine pattern)scripts/client-prediction.js- Optimistic placement with rollbackscripts/conflict-resolver.js- Handle simultaneous builds (first-write, timestamp, lock-based)scripts/building-network-manager.js- Complete server/client system
Architecture
Server-authoritative with client prediction:
- Client predicts placement locally (ghost piece)
- Server validates and confirms/rejects
- Client reconciles with server state
- Delta compression syncs only changes
What ships with it
6 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.
- 1mo ago First seen · 50 lines · 40 tokens per session scan A 653a95f6f99f
multiplayer-building is a skill published in the GitHub repository Bbeierle12/Skill-MCP-Claude (9 stars, last pushed yesterday), licensed MIT. It adds 40 tokens to every session and 314 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-31.
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