# Cruncher (npm · @slbdn/cruncher-mcp)

Scientific calculator MCP server with 43 tools: arithmetic, trig, stats, unit conversion.

- Trust score: 67/100 (medium)
- Change this week: −7
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- npm · `@slbdn/cruncher-mcp`: 67/100 (this document), [markdown](https://verifymcp.io/servers/islobodan-cruncher-mcp/slbdn-cruncher-mcp.md), [page](https://verifymcp.io/servers/islobodan-cruncher-mcp/slbdn-cruncher-mcp)

## Channel facts

- Registry: `npm`
- Package: `@slbdn/cruncher-mcp`
- Version: `1.2.29`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, 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.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - No production dependencies, so there is no dependency health to assess.
- **Provenance & Transparency**: 45/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 33 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 66/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 1179 tokens (~34/item across 34 items; 34 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 23/100
  - Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 68/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 4% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add islobodan-cruncher-mcp -- npx -y @slbdn/cruncher-mcp
```

### Codex

```bash
codex mcp add islobodan-cruncher-mcp -- npx -y @slbdn/cruncher-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "islobodan-cruncher-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@slbdn/cruncher-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add islobodan-cruncher-mcp --command npx --arg -y --arg @slbdn/cruncher-mcp
```

### Hermes

```yaml
mcp_servers:
  islobodan-cruncher-mcp:
    command: "npx"
    args: ["-y", "@slbdn/cruncher-mcp"]
```

### Other

```json
{
  "mcpServers": {
    "islobodan-cruncher-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@slbdn/cruncher-mcp"
      ]
    }
  }
}
```

## 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.

### 2026-08-02 (score 67, +18)

- [security improvement] Malware scan: unverified → pass
- [functional improvement] Stability: unverified → 0.20

### 2026-08-01 (score 49, −7)

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

### 2026-07-31 (score 56, −18)

- [security regression] Malware scan: pass → unverified

### 2026-07-27 (score 74, +27)

- [functional improvement] Tool coverage: unverified → 100
- [functional] First check of Schema quality: fail
- [functional] First check of Tool coverage: 4
- [functional] First check of Schema quality: pass
- [functional] First check of Schema quality: good

### 2026-07-26 (score 47)

First indexed and scored.

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

## MCP tools (34)

### `add` (~25 tokens)

Adds two numbers.

Input parameters:

- `a` (number, required)
- `b` (number, required)

### `subtract` (~27 tokens)

Subtracts two numbers.

Input parameters:

- `a` (number, required)
- `b` (number, required)

### `multiply` (~27 tokens)

Multiplies two numbers.

Input parameters:

- `a` (number, required)
- `b` (number, required)

### `divide` (~31 tokens)

Divides two numbers. Errors on zero divisor.

Input parameters:

- `a` (number, required)
- `b` (number, required)

### `power` (~29 tokens)

Raises a to the power of b.

Input parameters:

- `base` (number, required)
- `exponent` (number, required)

### `sqrt` (~22 tokens)

Square root. Errors on negative input.

Input parameters:

- `value` (number, required)

### `sine` (~39 tokens)

Sine. Angle in degrees by default, or radians with unit: "radians".

Input parameters:

- `angle` (number, required)
- `unit` (string)

### `cosine` (~39 tokens)

Cosine. Angle in degrees by default, or radians with unit: "radians".

Input parameters:

- `angle` (number, required)
- `unit` (string)

### `tangent` (~39 tokens)

Tangent. Angle in degrees by default, or radians with unit: "radians".

Input parameters:

- `angle` (number, required)
- `unit` (string)

### `asin` (~37 tokens)

Arcsine. Result in degrees by default, or radians with unit param.

Input parameters:

- `unit` (string)
- `value` (number, required)

### `acos` (~38 tokens)

Arccosine. Result in degrees by default, or radians with unit param.

Input parameters:

- `unit` (string)
- `value` (number, required)

### `atan` (~37 tokens)

Arctangent. Result in degrees by default, or radians with unit param.

Input parameters:

- `unit` (string)
- `value` (number, required)

### `logarithm` (~27 tokens)

Base-10 logarithm. Errors on non-positive input.

Input parameters:

- `value` (number, required)

### `natural_log` (~27 tokens)

Natural logarithm (ln). Errors on non-positive input.

Input parameters:

- `value` (number, required)

### `absolute` (~17 tokens)

Absolute value.

Input parameters:

- `value` (number, required)

### `get_constant` (~29 tokens)

Returns a mathematical, physical, or chemical constant. See enum values.

Input parameters:

- `name` (string, required)

### `sum` (~18 tokens)

Sum of numbers.

Input parameters:

- `numbers` (array, required)

### `avg` (~21 tokens)

Average (mean) of numbers.

Input parameters:

- `numbers` (array, required)

### `median` (~40 tokens)

Median of numbers.

Input parameters:

- `numbers` (array, required)
- `timeout` (number): Custom timeout in ms (100-60000, default: 3000)

### `min` (~18 tokens)

Minimum of numbers.

Input parameters:

- `numbers` (array, required)

### `max` (~18 tokens)

Maximum of numbers.

Input parameters:

- `numbers` (array, required)

### `count` (~17 tokens)

Count elements.

Input parameters:

- `numbers` (array, required)

### `range` (~23 tokens)

Range (max - min) of numbers.

Input parameters:

- `numbers` (array, required)

### `variance` (~38 tokens)

Sample variance (n-1). Set population: true for population variance (n).

Input parameters:

- `numbers` (array, required)
- `population` (boolean)

### `std_dev` (~39 tokens)

Sample standard deviation (n-1). Set population: true for population (n).

Input parameters:

- `numbers` (array, required)
- `population` (boolean)

### `percentage_of` (~42 tokens)

What is X% of Y? e.g., 15% of 200 = 30

Input parameters:

- `percent` (number, required)
- `total` (number, required)

### `percentage_change` (~40 tokens)

Percentage change from A to B. e.g., 50→80 = +60%

Input parameters:

- `from` (number, required)
- `to` (number, required)

### `percentage_reverse` (~42 tokens)

X is Y% of what? e.g., 30 is 15% of 200

Input parameters:

- `percent` (number, required)
- `value` (number, required)

### `modulo` (~34 tokens)

Remainder of a / b. Errors on zero divisor.

Input parameters:

- `a` (number, required)
- `b` (number, required)

### `factorial` (~52 tokens)

Factorial of non-negative integer (n!). n > 170 overflows.

Input parameters:

- `n` (number, required)
- `timeout` (number): Custom timeout in ms (100-60000, default: 3000)

### `evaluate_expression` (~142 tokens)

Evaluate a mathematical expression. PRIMARY tool for ALL math: +, -, *, /, %, ^. Functions: sqrt, sin, cos, tan, asin, acos, atan, log10, ln, log(x,base), abs, round, floor, ceil, min, max. Constants: pi, e, tau, phi, sqrt2, euler_mascheroni, c, g, G, h, k, R, NA, e_charge, m_e, m_p. Parentheses and scientific notation (1e6) supported. Use explicit operators: 2 * pi, not 2pi.

Input parameters:

- `expression` (string, required)

### `convert_unit` (~60 tokens)

Convert between common units. Categories: length, weight, temperature, area, volume, time, speed, digital_storage.

Input parameters:

- `category` (string, required)
- `from` (string, required)
- `to` (string, required)
- `value` (number, required)

### `set_angle_mode` (~30 tokens)

Set global trig angle mode. Individual calls with unit param override this.

Input parameters:

- `mode` (string, required)

### `get_angle_mode` (~15 tokens)

Get current trig angle mode.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/islobodan-cruncher-mcp/slbdn-cruncher-mcp#diagnostics

## Score history

- 2026-08-03: 67
- 2026-08-02: 67
- 2026-08-01: 49
- 2026-07-31: 56
- 2026-07-29: 74
- 2026-07-28: 74
- 2026-07-27: 74
- 2026-07-26: 47

## Links

- npm package: https://www.npmjs.com/package/@slbdn/cruncher-mcp
- Socket report: https://socket.dev/npm/package/@slbdn/cruncher-mcp
- Repository: https://github.com/islobodan/cruncher-mcp
- Changelog RSS feed: https://verifymcp.io/servers/islobodan-cruncher-mcp/slbdn-cruncher-mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/islobodan-cruncher-mcp/slbdn-cruncher-mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/islobodan-cruncher-mcp/slbdn-cruncher-mcp