com.usephysics/physics-calculators
usephysics
Is the com.usephysics/physics-calculators MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-14.
Physics calculators that show their work, plus the CODATA 2022 constants. Educational use.
alive probed 2026-11-14 · HTTP 200
- Endpoint
- https://usephysics.com/api/mcp (streamable-http)
- Host
- usephysics.com
- Protocol
- 2025-11-25
- Reports itself as
- usephysics 0.1.0
- Capabilities
- tools
- Instructions
- 532 characters
- Of a 1M window
- <0.1 % of a 1M context window
- Count
- 864 tokens in Claude Opus 5.5, exact, measured 2026-11-14. With the Claude Code prefix mcp__…__ on each tool name: 908. The o200k_base estimate is 500. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/jukkablomberg/usephysics
- Website
- https://usephysics.com
- Registry
- active, updated 2026-11-03 · registry entry
- Changes
- 3 recorded, reachable in 2 of them. A row is added when the result, the tool count or the cost changes.
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.73×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| calculate | 299 | 173 | 35 % |
| get_constant | 254 | 147 | 29 % |
| list_calculators | 161 | 93 | 19 % |
| list_constants | 150 | 87 | 17 % |
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History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-11-14 10:44 | alive | 832 ms | 4 | 864 | 500 |
| 2026-11-13 11:23 | not MCP | ||||
| 2026-11-03 11:09 | alive | 1.6 s | 4 | 864 | 500 |
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
- The server answers initialize and tools/list. Nothing to fix.
Fixed something? Probe it now, with the same steps as the daily run. This page updates with the next daily run.