com.onlyworlds/mcp
OnlyWorlds
Read and write typed fictional worlds (22 linked element types) via the OnlyWorlds open standard.
alive probed 2026-10-07 · HTTP 200
12tools
4.4ktokens in Claude Opus 5.5
4.4ktokens in Claude Code
2.2 %of a 200k context window
2.8ko200k_base estimate
942 msto initialize
122 msto list tools
- Endpoint
- https://www.onlyworlds.com/mcp (streamable-http)
- Host
- www.onlyworlds.com
- Protocol
- 2025-11-25
- Reports itself as
- OnlyWorlds 3.4.4
- Capabilities
- experimental, extensions, logging, prompts, resources, tools
- Instructions
- none
- Claude count
- Claude Opus 5.5, measured 2026-10-07. Counted again when the tool definitions change. Method.
- Website
- https://www.onlyworlds.com
- Registry
- active, updated 2026-07-24 · registry entry
- Reachable
- 7 of the last 7 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| get_changes | 339 | 12 % |
| edit_links | 321 | 12 % |
| get_image_upload_ticket | 314 | 11 % |
| bulk_apply | 287 | 10 % |
| update_element | 281 | 10 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-07 11:03 | alive | 1.4 s | 12 | 4.4k | 2.8k |
| 2026-10-05 13:30 | alive | 942 ms | 11 | 3.8k | 2.4k |
| 2026-10-05 00:18 | alive | 5.3 s | 11 | 2.4k | |
| 2026-10-04 09:57 | alive | 2.6 s | 11 | 2.4k | |
| 2026-10-04 07:51 | alive | 2.1 s | 11 | 2.4k | |
| 2026-10-03 20:31 | alive | 2.1 s | 11 | 2.4k | |
| 2026-10-03 17:49 | alive | 734 ms | 11 | 2.4k |
Badge and feed
[](https://mcpcost.ulehla.dev/s/com.onlyworlds/mcp)
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.