Connect browser agents, embedded AI assistants, and MCP clients to CesiumJS through one shared command layer.
Camera control, GeoJSON layers, 3D Tiles, terrain, imagery, entities, trajectories, heatmaps, geocoding, and more — organized into 12 selectable toolsets.
Expose page-local tools directly to compatible browsers, or connect MCP clients through the stable SDK v2 runtime with support for MCP 2025-11-25 and 2026-07-28.
Install `cesium-mcp-runtime` for standard MCP or `cesium-mcp-webmcp` for page-native WebMCP. Low-level packages remain available for custom applications.
Browser Agent, WebMCP, function calling, and MCP Runtime all reach the same command layer; WebSocket is used only for external MCP-to-Viewer sessions.
One command to start: `npx -y cesium-mcp-runtime`. The browser Bridge and built-in Viewer are already included.
Major.minor tracks the verified CesiumJS baseline (1.145.x targets Cesium ~1.145.0). Patch versions iterate independently for MCP features.
The diagram below shows the MCP runtime path. The default Runtime package already serves the Bridge and built-in Viewer; the separate Bridge SDK is only needed for a custom page. WebMCP is a browser-native adapter that connects a compatible browser agent directly to the same command layer, without the Node.js runtime or WebSocket transport. Compare the integration modes.
1. Your AI agent sends a natural language request, which the MCP client translates into a tool call.
2. cesium-mcp-runtime receives the call via stdio and forwards it as a WebSocket command.
3. The packaged cesium-mcp-bridge executes the command on the built-in Viewer or a custom CesiumJS page.
4. Results flow back through the same pipeline to the AI agent.
| Package | Description | Version |
|---|---|---|
cesium-mcp-contracts | Transport-neutral tool contracts and JSON Schemas |  |
cesium-mcp-bridge | Browser SDK — embed in your CesiumJS application |  |
cesium-mcp-webmcp | One-package Viewer integration and native browser WebMCP adapter |  |
cesium-mcp-runtime | One-package MCP Server, built-in Viewer, 62 command tools and 2 resources |  |
cesium-mcp-dev | IDE MCP Server — Cesium API docs and code generation |  |