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cesium-mcp: Instructions file for Claude Code

CLAUDE.md

cesium-mcp CLAUDE.md is an instructions file for Claude Code from gaopengbin/cesium-mcp. It costs 1,113 tokens per session, scanned B, a copy of cesium-mcp AGENTS.md, MIT.

A set of project instructions for cesium-mcp, a monorepo: one repository containing several related packages. The project connects AI agents to a CesiumJS 3D globe in a browser and includes commands, conventions, structure, and guidance for adding tools.

In plain words
What is it for?
Use it when developing cesium-mcp, adding a tool, navigating its packages and examples, or running the project’s standard checks.
Why use it?
It gives an agent the project-specific information needed to work consistently across packages. It explains which commands build, test, lint, and type-check the repository.

Instructions file for Claude Code

Written for Claude Code: SessionStart hook event. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is gaopengbin/cesium-mcp's own configuration. It tells Claude Code how to work on cesium-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything cesium-mcp configures →

not rated 135repo +1 yesterday B scan 1,113 tokens copy · 97% MIT
View source ↗ gaopengbin/cesium-mcp gaopengbin.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to gaopengbin/cesium-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/gaopengbin/cesium-mcp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/gaopengbin/cesium-mcp

Made for: Claude Code.

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README.md
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Per session 1,113 This file is loaded in full into every session.
When invoked 1,113 The same file — it is already loaded in full.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin 97% copy Near-identical to another mod 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 $0.01113 $0.01113
Opus 5 $0.00557 $0.00557
Sonnet 5 $0.00223 $0.00223
Haiku 4.5 $0.00111 $0.00111

Measured 8d ago against content hash 967d76e1f448, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade B, and why

cesium-mcp CLAUDE.md scanned grade B with 1 finding 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.

Reads MCP configurationmediumAgent snooping

mcp.json carries server URLs and auth tokens; reading it lets a mod discover and abuse other integrations.

- Commit `.env` files, `.vscode/mcp.json`, or any Ion tokens / API keys.
Origin

This is a copy

97% identical to cesium-mcp AGENTS.md — 4 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CLAUDE.md · 84 lines

How it starts

The opening of the file, as written. The whole thing — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md — cesium-mcp

AI agent integration for CesiumJS. A monorepo providing an MCP server that lets AI agents control a 3D globe (CesiumJS) in the browser via WebSocket, plus IDE tooling for Cesium API doc lookup and code generation.

Monorepo Structure

packages/
  cesium-mcp-bridge/    # SDK — command execution layer (browser-side, controls Cesium viewer)
  cesium-mcp-runtime/   # MCP stdio/HTTP server — bridges AI agents to browser via WebSocket
  cesium-mcp-dev/       # IDE assistant — Cesium API doc queries and code generation
examples/               # browser-agent, dify-integration, emergency-response, minimal, video
docs/                   # VitePress site (guide, api, design, examples, zh-CN)
.claude-plugin/         # Claude Code plugin manifest
hooks/                  # Plugin hooks (SessionStart, etc.)
skills/                 # Plugin skills (/cesium-quickstart)

Commands

Command Purpose
npm run build Build all packages (tsup)
npm test / npx vitest run Run tests
npm run lint ESLint all packages
npm run typecheck tsc --noEmit across workspaces
npm run clean Remove all dist/
npm run build -w packages/cesium-mcp-bridge Build one package
npm run changeset Add a changeset for versioning

Install: npm ci at root (workspaces + patch-package postinstall).

Code Conventions

  • No semicolons. Single quotes. Trailing commas on multi-line.
  • 2-space indent. ESM throughout.
  • import type { ... } separate from value imports.
  • Files: kebab-case. Symbols: camelCase functions/vars, PascalCase types/classes.
  • Type suffixes: XxxParams, XxxResult.
  • One file per domain under src/commands/ (camera.ts, layer.ts, scene.ts, etc.).
  • Commands are plain functions (viewer: Cesium.Viewer, params: XxxParams) => result, not classes.
  • Tests: Vitest, colocated as *.test.ts. Import source via ./foo.js (NodeNext ESM).
  • Types in types.ts with // ========== Section ========== banners. No zod in bridge.

Read the full file on GitHub · 84 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. 8d ago First seen · 84 lines · 1,113 tokens per session scan B 967d76e1f448

Subscribe to this mod's changes

cesium-mcp CLAUDE.md is an instructions file published in the GitHub repository gaopengbin/cesium-mcp (135 stars, last pushed yesterday), licensed MIT. It adds 1,113 tokens to every session, about $0.0056 per session on Opus 5. A static security scan graded it B with 1 finding (reads mcp configuration). It is 97% identical to cesium-mcp AGENTS.md, differing in 4 lines, and is treated as a copy.

3d-visualizationaiai-agentcesiumcesiumjsgeospatial
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