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UsePhysics MCP server

Which MCP servers are UsePhysics's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-11-03

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Whose server it is
  • Registry namecom.usephysics/physics-calculatorsverified in the MCP registry

The registry name sits under usephysics.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-11-03
  • Stateanswerschecked 2026-11-03
  • Tools4
  • Server calls itselfusephysics
  • Server version0.1.0
  • Protocol version2025-06-18

On 2026-11-03 the server answered initialize and tools/list without a sign-in. First answer in 146 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.
  • Checked on 1 of the 7 days it takes to judge reliability.

Once connected

  • For "compute projectile range from launch speed and angle", the likely first call is list_calculators.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 1, the first on 2026-11-03
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 1 so far
  • Answeredmeasuring1 of the 7 daily checks it takes to print a share
  • Median first answer193 ms
  • Space in an agent's context≈ 529 tokensthe definitions of all its tools (4), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results0 of 4 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • not sure · check homework answers against worked physics formulas
  • not sure · estimate yearly running cost of household appliances
  • can do · compute projectile range from launch speed and angle

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers4 tools · read 2026-11-03
  • list_calculators

    Every UsePhysics calculator: id (slug), name, category, formula, inputs (key, unit, default) and page URL. Optional category filter.

  • calculate

    Run one calculator by id with numeric inputs (keys from list_calculators, in the listed units). Returns every result with its unit, the formula, the Given → Formula → Substitute → Result working when the engine can derive it, and the URL…

  • get_constant

    One CODATA 2022 constant by id, symbol or name (e.g. 'c', 'speed of light', 'planck-constant'): value as NIST prints it, machine-readable value, standard uncertainty (null = exact), unit, note, page and NIST source.

  • list_constants

    The CODATA 2022 constants UsePhysics keeps, grouped; optional group id filter. Values are NIST's.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "physics-calculators": {
      "type": "http",
      "url": "https://usephysics.com/api/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http usephysics https://usephysics.com/api/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://usephysics.com/api/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.