# com.usephysics/physics-calculators (remote · usephysics.com)

Physics calculators that show their work, plus the CODATA 2022 constants. Educational use.

- Trust score: 74/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `usephysics.com`: 74/100 (this document), [markdown](https://verifymcp.io/servers/com-usephysics-physics-calculators/api-mcp.md), [page](https://verifymcp.io/servers/com-usephysics-physics-calculators/api-mcp)

## Channel facts

- Endpoint: `https://usephysics.com/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Nothing on it is marked destructive, but we can't show that an anonymous caller can only read: full credit needs the server to list at least one tool and every tool to be verifiably read-only. We use a best-effort check of tool names and descriptions to tell read-only tools from tools that change things, so some genuinely read-only tools may not get full credit. Names that start with a read verb (get, list, read, search and similar) and accurate readOnlyHint annotations help. Meet that to earn full credit, or require authorisation.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 75/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 441 tokens (~110/item across 4 items; 4 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 7/100
  - Stability observed for 2 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the com.usephysics/physics-calculators MCP server?

com.usephysics/physics-calculators is a hosted endpoint at https://usephysics.com/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http com-usephysics-physics-calculators 'https://usephysics.com/api/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-usephysics-physics-calculators": {
      "url": "https://usephysics.com/api/mcp"
    }
  }
}
```

### VS Code

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

### Codex

```toml
[mcp_servers.com-usephysics-physics-calculators]
url = "https://usephysics.com/api/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-usephysics-physics-calculators": {
      "type": "remote",
      "url": "https://usephysics.com/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-usephysics-physics-calculators --url 'https://usephysics.com/api/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-usephysics-physics-calculators:
    url: "https://usephysics.com/api/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-usephysics-physics-calculators": {
      "Transport": "http",
      "Url": "https://usephysics.com/api/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-usephysics-physics-calculators -t streamable-http -u 'https://usephysics.com/api/mcp'
```

### Other

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

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-04 (score 74, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-11-03 (score 74)

First indexed and scored.

## MCP tools (4)

### `list_calculators` (~61 tokens)

List the calculators

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

Input parameters:

- `category` (string): e.g. Mechanics, Energy, Electricity & Waves, Everyday Life

### `calculate` (~112 tokens)

Run a calculator

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 of the solved page.

Input parameters:

- `calculator_id` (string, required): The calculator id (slug) from list_calculators, e.g. kinetic-energy
- `inputs` (object, required): Input values keyed by input key, in the listed units; a missing key takes the default

### `get_constant` (~99 tokens)

Look up a physical 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.

Input parameters:

- `query` (string, required): id, symbol or name, e.g. 'c', 'speed-of-light-in-vacuum', 'Planck constant'

### `list_constants` (~55 tokens)

List the physical constants

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

Input parameters:

- `group` (string): A group id from a previous answer, e.g. si-defining-constants

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-usephysics-physics-calculators/api-mcp#diagnostics

## Score history

- 2026-11-05: 74
- 2026-11-04: 74
- 2026-11-03: 74

## Common questions

### What is the com.usephysics/physics-calculators MCP server?

com.usephysics/physics-calculators is an MCP server listed in the public MCP registry as com.usephysics/physics-calculators. Physics calculators that show their work, plus the CODATA 2022 constants. Educational use. This page covers its hosted endpoint (https://usephysics.com/api/mcp).

### Is the com.usephysics/physics-calculators MCP server safe to use?

com.usephysics/physics-calculators scores 74 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the com.usephysics/physics-calculators MCP server expose?

com.usephysics/physics-calculators exposes 4 tools: list_calculators, calculate, get_constant, list_constants. Their descriptions and schemas cost roughly 327 tokens of context every time the server is loaded.

### Does the com.usephysics/physics-calculators MCP server require authentication?

No. We connected to com.usephysics/physics-calculators without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the com.usephysics/physics-calculators MCP server still maintained?

com.usephysics/physics-calculators is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What did VerifyMCP test on the com.usephysics/physics-calculators MCP server?

VerifyMCP ran 13 checks on com.usephysics/physics-calculators, covering TLS certificate, Authorization, HTTPS, HSTS header and 9 more. Supply Chain Security and Provenance & Transparency do not apply to a hosted endpoint, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- Remote endpoint: https://usephysics.com/api/mcp
- Repository: https://github.com/jukkablomberg/usephysics
- Website: https://usephysics.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-usephysics-physics-calculators/api-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-usephysics-physics-calculators/api-mcp/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/com-usephysics-physics-calculators/api-mcp.json
- HTML version of this page: https://verifymcp.io/servers/com-usephysics-physics-calculators/api-mcp