# io.github.cyanheads/calculator-mcp-server (remote · calculator.caseyjhand.com)

Evaluate, simplify, and differentiate mathematical expressions.

- Trust score: 71/100 (medium)
- Change this week: +5
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `calculator.caseyjhand.com`: 71/100 (this document), [markdown](https://verifymcp.io/servers/cyanheads-calculator-mcp-server/calculator.md), [page](https://verifymcp.io/servers/cyanheads-calculator-mcp-server/calculator)
- npm · `@cyanheads/calculator-mcp-server`: 35/100, [markdown](https://verifymcp.io/servers/cyanheads-calculator-mcp-server/cyanheads-calculator-mcp-server.md), [page](https://verifymcp.io/servers/cyanheads-calculator-mcp-server/cyanheads-calculator-mcp-server)

## Channel facts

- Endpoint: `https://calculator.caseyjhand.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.4.0`

## 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 2026-08-03.

- **Endpoint Security**: 66/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 1 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC is configured correctly; the domain's records validate against the full chain to the root.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 77/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 798 tokens (~399/item across 2 items; 1 tools + 1 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 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.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http cyanheads-calculator-mcp-server https://calculator.caseyjhand.com/mcp
```

### Codex

```toml
[mcp_servers.cyanheads-calculator-mcp-server]
url = "https://calculator.caseyjhand.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "cyanheads-calculator-mcp-server": {
      "type": "remote",
      "url": "https://calculator.caseyjhand.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add cyanheads-calculator-mcp-server --url https://calculator.caseyjhand.com/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  cyanheads-calculator-mcp-server:
    url: "https://calculator.caseyjhand.com/mcp"
```

### Other

```json
{
  "mcpServers": {
    "cyanheads-calculator-mcp-server": {
      "type": "http",
      "url": "https://calculator.caseyjhand.com/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.

### 2026-08-03 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-01 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 17 to 20. That category is still filling its 30-day observation window: 5 days of observed history at the previous scan, 6 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-31 (score 69, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 68, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-29 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-28 (score 67, +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.

### 2026-07-27 (score 66, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 66)

First indexed and scored.

## MCP tools (1)

### `calculate` (~659 tokens)

Calculate

Evaluate math expressions, simplify algebraic expressions, or compute symbolic derivatives. One expression per call. Supports arithmetic, trigonometry, statistics, matrices, complex numbers, units, and combinatorics.

Input parameters:

- `expression` (string, required): One mathematical expression per call — neither `;` nor newlines separate statements. Inside matrices, `;` separates rows (e.g. `[1, 2; 3, 4]`). Supports arithmetic (+, -, *, /, ^, %), functions acros…
- `numericType` (string): Numeric type for evaluate. "number" (default): 64-bit IEEE 754 float — fastest, standard precision. "BigNumber": arbitrary-precision decimal — use when intermediate values overflow 64-bit float (e.g.…
- `operation` (string): Operation to perform. "evaluate" computes a numeric result (default). "simplify" reduces an algebraic expression symbolically (e.g., "2x + 3x" -> "5 * x"). Supports algebraic and trigonometric identi…
- `precision`: Significant digits (1–16) for numeric results. Omit for full precision. Empty string is treated as omitted. Ignored for symbolic operations (simplify, derivative).
- `scope` (object): Variable assignments for the expression. Example: { "x": 5, "y": 3 } makes "x + y" evaluate to 8.
- `variable`: Variable to differentiate with respect to. Required when operation is "derivative". Empty string is treated as omitted. Example: "x".

Output parameters:

- `expression` (string): The original expression as received.
- `operation` (string): The operation that was applied.
- `precisionUsed` (number): Significant-digit precision applied to the result. Omitted when full precision was used or the operation is symbolic.
- `result` (string): The computed result as a string.
- `resultType` (string): Type of result as reported by math.js: number, BigNumber, Complex, DenseMatrix, Unit, string, boolean. Symbolic operations return "string".
- `scopeVars` (array): Keys from the scope that were active during evaluation. Omitted when no scope was provided. Values are omitted to keep output compact.
- `unchanged` (boolean): Present only for simplify operations. true means the simplifier returned the expression unchanged — it could not reduce it further (e.g. rational expressions requiring polynomial factoring are beyond…

## Diagnostics

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

## Score history

- 2026-08-03: 71
- 2026-08-02: 70
- 2026-08-01: 70
- 2026-07-31: 69
- 2026-07-30: 68
- 2026-07-29: 68
- 2026-07-28: 67
- 2026-07-27: 66
- 2026-07-26: 66

## Links

- Remote endpoint: https://calculator.caseyjhand.com/mcp
- Repository: https://github.com/cyanheads/calculator-mcp-server
- Changelog RSS feed: https://verifymcp.io/servers/cyanheads-calculator-mcp-server/calculator/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/cyanheads-calculator-mcp-server/calculator/changelog.json
- HTML version of this page: https://verifymcp.io/servers/cyanheads-calculator-mcp-server/calculator