io.github.ProjectMakersDE/horizon-mcp
horizOn
Docs, live API tools and prompts for the horizOn game backend in Godot, Unity and Unreal.
alive probed 2026-10-19
121tools
≈ 68ktokens, estimate
≈ 33.8 %of Claude's 200k window
47×the median server
414 msto initialize
27 msto list tools
- Run it
- npx -y horizon-mcp@1.8.1 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- horizon-mcp 1.8.1
- Capabilities
- prompts, resources, tools
- Instructions
- none
- Of a 1M window
- ≈ 6.8 % of a 1M context window, estimate
- Claude count
- The count_tokens endpoint refused the tool schemas: invalid x-api-key. The estimate stands in.
- Repository
- https://github.com/ProjectMakersDE/horizOn-mcp
- Website
- https://horizon.pm
- Registry
- active, updated 2026-10-10 · registry entry
- Reachable
- 1 of the last 1 probe
Most expensive tools
Estimates with the o200k_base tokenizer.
| Tool | o200k estimate | Share of this server |
|---|---|---|
| horizon_submit_validated | 1 673 | 2 % |
| horizon_admin_news_update | 1 132 | 2 % |
| horizon_start_run | 1 127 | 2 % |
| horizon_admin_giftcodes_create | 1 127 | 2 % |
| horizon_admin_emailtemplates_create | 1 123 | 2 % |
Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- This server is in the heaviest 10 % of the registry. Shorter descriptions, fewer optional parameters and fewer tools cut the cost. The command npx mcpcost --url <endpoint> --tools 50 lists every tool with its cost.
- The Anthropic count_tokens endpoint refused the tool schemas (invalid x-api-key). A client that validates schemas can refuse them too.