org.r3js/r3
R3
Build 3D web apps: physics, audio, music, Blender import. Live edits, undo, versions, publishing.
alive probed 2026-10-15 · HTTP 200
50tools
24ktokens in Claude Opus 5.5
24ktokens in Claude Code
12.0 %of a 200k context window
15ko200k_base estimate
1.7 sto initialize
203 msto list tools
- Endpoint
- https://mcp.r3js.org/mcp (streamable-http)
- Host
- mcp.r3js.org
- Protocol
- 2025-11-25
- Reports itself as
- r3 3.30.0
- Capabilities
- completions, resources, tools
- Instructions
- 8 701 characters
- Claude count
- Claude Opus 5.5, measured 2026-10-15. Counted again when the tool definitions change. Method.
- Website
- https://r3js.org
- Registry
- active, updated 2026-10-15 · registry entry
- Reachable
- 10 of the last 10 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| r3_publish_settings_set | 970 | 6 % |
| r3_code_write | 874 | 6 % |
| r3_component_set | 655 | 4 % |
| r3_help_write | 449 | 3 % |
| r3_asset_delete | 424 | 3 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-15 11:45 | alive | 1.7 s | 50 | 24k | 15k |
| 2026-10-12 12:00 | needs auth | ||||
| 2026-10-11 10:39 | needs auth | ||||
| 2026-10-10 10:34 | needs auth | ||||
| 2026-10-09 11:37 | needs auth | ||||
| 2026-10-05 01:01 | needs auth | ||||
| 2026-10-04 10:09 | needs auth | ||||
| 2026-10-04 08:03 | needs auth | ||||
| 2026-10-03 20:42 | needs auth | ||||
| 2026-10-03 17:57 | needs auth |
Badge and feed
[](https://mcpcost.ulehla.dev/s/org.r3js/r3)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.