What is worldlabs-mcp CLAUDE.md?

An MCP server connects coding assistants to the World Labs Marble API for generating three-dimensional worlds and to the Spark 2.0 spatial viewer.

It covers starting the server, its standard tool structure, response fields, and connections over local or HTTP communication.

It gives an assistant a documented entry point and response format for working with these World Labs services.

How sandraschi/worldlabs-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to sandraschi/worldlabs-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/sandraschi/worldlabs-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/sandraschi/worldlabs-mcp

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/sandraschi/worldlabs-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/sandraschi/worldlabs-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/sandraschi/worldlabs-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/sandraschi/worldlabs-mcp/claude-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/sandraschi/worldlabs-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/sandraschi/worldlabs-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 197 This file is loaded in full into every session.

When invoked 197 The same file — it is already loaded in full.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00197	$0.00197
Opus 5.5	$0.00079	$0.00079
Sonnet 5.5	$0.00039	$0.00039
Haiku 4.5	$0.00020	$0.00020

Measured 2mo ago against content hash 929bc7fcc2aa, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

worldlabs-mcp CLAUDE.md 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 2mo 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

notepadpp-mcp CLAUDE.md — 86% identical, 6 lines differ

CLAUDE.md · 19 lines

What it actually says

worldlabs-mcp — Claude Code Guide

Overview

MCP server wrapping the World Labs Marble API for 3D world generation and the Spark 2.0 spatial viewer

Entry Points

uv run worldlabs-mcp → worldlabs_mcp.server:main

Standards

FastMCP 3.2+ portmanteau tool pattern — tools use operation enum param
Responses: structured dicts with success, message, domain-specific fields
Dual transport: stdio (Claude Desktop) + HTTP (MCP_TRANSPORT=http)
See mcp-central-docs for fleet-wide coding standards

Key Files

README.md — full documentation
pyproject.toml — build config and entry points
AGENTS.md — OpenAI Codex agent context (if present)

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.

2mo ago First seen · 19 lines · 197 tokens per session scan A 929bc7fcc2aa

Subscribe to this mod's changes

worldlabs-mcp CLAUDE.md is an instructions file published in the GitHub repository sandraschi/worldlabs-mcp (24 stars, last pushed today), licensed MIT. It adds 197 tokens to every session, about $0.0008 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 2026-08-30.

Creative and media marble mcp-server webapp worldlabs

worldlabs-mcp CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
worldlabs-mcp CLAUDE.mdsandraschi/worldlabs-mcp	Instructions file	24	today	MIT	A	197	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

worldlabs-mcp: Instructions file for Claude Code