# MatrixCalculator.net (remote · mcp.matrixcalculator.net)

Exact matrix calculations with step-by-step results for six core matrix operations.

- Trust score: 69/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-17

## Components

- remote · `mcp.matrixcalculator.net`: 69/100 (this document), [markdown](https://verifymcp.io/servers/gamestarry-matrixcalculator-mcp/mcp.md), [page](https://verifymcp.io/servers/gamestarry-matrixcalculator-mcp/mcp)

## Channel facts

- Endpoint: `https://mcp.matrixcalculator.net/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 2026-10-17.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - 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**: 80/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 632 tokens (~105/item across 6 items; 6 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 6 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the MatrixCalculator.net MCP server?

MatrixCalculator.net is a hosted endpoint at https://mcp.matrixcalculator.net/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 gamestarry-matrixcalculator-mcp 'https://mcp.matrixcalculator.net/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "gamestarry-matrixcalculator-mcp": {
      "url": "https://mcp.matrixcalculator.net/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "gamestarry-matrixcalculator-mcp": {
      "type": "http",
      "url": "https://mcp.matrixcalculator.net/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.gamestarry-matrixcalculator-mcp]
url = "https://mcp.matrixcalculator.net/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "gamestarry-matrixcalculator-mcp": {
      "type": "remote",
      "url": "https://mcp.matrixcalculator.net/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add gamestarry-matrixcalculator-mcp --url 'https://mcp.matrixcalculator.net/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  gamestarry-matrixcalculator-mcp:
    url: "https://mcp.matrixcalculator.net/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "gamestarry-matrixcalculator-mcp": {
      "Transport": "http",
      "Url": "https://mcp.matrixcalculator.net/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add gamestarry-matrixcalculator-mcp -t streamable-http -u 'https://mcp.matrixcalculator.net/mcp'
```

### Other

```json
{
  "mcpServers": {
    "gamestarry-matrixcalculator-mcp": {
      "type": "http",
      "url": "https://mcp.matrixcalculator.net/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.

### 2026-10-17 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-16 (score 68, +8)

- [security improvement] Authorization: unverified → partial
- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “matrix_add” rewrote its description, which is the text the model reads
- [security] Tool “matrix_determinant” rewrote its description, which is the text the model reads
- [security] Tool “matrix_inverse” rewrote its description, which is the text the model reads
- [security] Tool “matrix_multiply” rewrote its description, which is the text the model reads
- [security] Tool “matrix_subtract” rewrote its description, which is the text the model reads
- [security] Tool “matrix_transpose” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 67 → 105
- [functional improvement] Stability: unverified → 0.03

### 2026-10-15 (score 60)

First indexed and scored.

## MCP tools (6)

### `matrix_add` (~81 tokens)

Add two matrices of the same dimensions entry by entry. Useful for exact matrix addition or explaining each entry step by step. Accepts integers, decimals, and fraction strings (for example 1/2); returns the exact sum matrix and a calculation for each position.

Input parameters:

- `matrixA` (array, required): First matrix.
- `matrixB` (array, required): Second matrix.

### `matrix_subtract` (~80 tokens)

Subtract matrix B from matrix A when both have the same dimensions. Useful for exact matrix subtraction, including negative values and step-by-step entry calculations. Accepts integers, decimals, and fraction strings; returns each exact difference and its calculation.

Input parameters:

- `matrixA` (array, required): Matrix to subtract from.
- `matrixB` (array, required): Matrix to subtract.

### `matrix_multiply` (~85 tokens)

Multiply A by B when A's column count equals B's row count, including non-square matrices. Useful for exact matrix multiplication and step-by-step row-by-column dot products. Returns exact results plus each factor pair, product, and entry calculation; accepts fractions and decimals.

Input parameters:

- `matrixA` (array, required): Left matrix A.
- `matrixB` (array, required): Right matrix B.

### `matrix_determinant` (~67 tokens)

Find the exact determinant of a square matrix using fraction-preserving elimination. Use for determinant questions requiring row swaps, elimination steps, pivot multipliers, sign changes, diagonal products, or singularity checks. Returns the determinant and detailed operation steps.

Input parameters:

- `matrix` (array, required): Square matrix.

### `matrix_inverse` (~80 tokens)

Find an exact inverse of a square matrix with step-by-step Gauss-Jordan elimination. Use for inverse questions needing exact fractions, augmented matrices, row swaps, normalization, elimination, and verification that A times A-inverse is identity. Returns the inverse and verification, or null with singular=true if not invertible.

Input parameters:

- `matrix` (array, required): Square matrix.

### `matrix_transpose` (~66 tokens)

Transpose a rectangular or square matrix by exchanging rows and columns. Useful for requests to show where each result entry originated. Preserves exact integer, decimal, and fraction inputs and returns the transposed matrix with source-to-result position mappings.

Input parameters:

- `matrix` (array, required): Matrix to transpose.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/gamestarry-matrixcalculator-mcp/mcp#diagnostics

## Score history

- 2026-10-17: 69
- 2026-10-16: 68
- 2026-10-15: 60

## Common questions

### What is the MatrixCalculator.net MCP server?

MatrixCalculator.net is an MCP server listed in the public MCP registry as io.github.gamestarry/matrixcalculator-mcp. Exact matrix calculations with step-by-step results for six core matrix operations. This page covers its hosted endpoint (https://mcp.matrixcalculator.net/mcp).

### Is the MatrixCalculator.net MCP server safe to use?

MatrixCalculator.net scores 69 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 MatrixCalculator.net MCP server expose?

MatrixCalculator.net exposes 6 tools: matrix_add, matrix_subtract, matrix_multiply, matrix_determinant, matrix_inverse, matrix_transpose. Their descriptions and schemas cost roughly 459 tokens of context every time the server is loaded.

### Does the MatrixCalculator.net MCP server require authentication?

No. We connected to MatrixCalculator.net without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the MatrixCalculator.net MCP server still maintained?

MatrixCalculator.net is still listed as active in the MCP registry. We last reached this channel on 17 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://mcp.matrixcalculator.net/mcp
- Repository: https://github.com/gamestarry/matrixcalculator-mcp
- Website: https://matrixcalculator.net/
- Changelog RSS feed: https://verifymcp.io/servers/gamestarry-matrixcalculator-mcp/mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/gamestarry-matrixcalculator-mcp/mcp.json
- HTML version of this page: https://verifymcp.io/servers/gamestarry-matrixcalculator-mcp/mcp