# io.github.coo-quack/calc-mcp (npm · @coo-quack/calc-mcp)

21 MCP tools for math, randomness, dates, encoding, hashing, and more — deterministic and accurate.

- Trust score: 77/100 (medium)
- Change this week: +31
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- npm · `@coo-quack/calc-mcp`: 77/100 (this document), [markdown](https://verifymcp.io/servers/coo-quack-calc-mcp/coo-quack-calc-mcp.md), [page](https://verifymcp.io/servers/coo-quack-calc-mcp/coo-quack-calc-mcp)

## Channel facts

- Registry: `npm`
- Package: `@coo-quack/calc-mcp`
- Version: `2.0.4`
- 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**: 87/100
  - No malware found by supply-chain analysis.
  - Only part of the dependency tree could be resolved (106 of 110), so this covers what we could see, not the whole tree.
  - No install/post-install scripts declared.
  - Only part of the dependency tree could be resolved (106 of 110), so this covers what we could see, not the whole tree.
- **Provenance & Transparency**: 84/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to coo-quack/calc-mcp).
  - License check failed: no license is declared.
  - Actively maintained (last published 10 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 77/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 1697 tokens (~80/item across 21 items; 21 tools + 0 resources), lean.
  - 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.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add coo-quack-calc-mcp -- npx -y @coo-quack/calc-mcp
```

### Codex

```bash
codex mcp add coo-quack-calc-mcp -- npx -y @coo-quack/calc-mcp
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add coo-quack-calc-mcp --command npx --arg -y --arg @coo-quack/calc-mcp
```

### Hermes

```yaml
mcp_servers:
  coo-quack-calc-mcp:
    command: "npx"
    args: ["-y", "@coo-quack/calc-mcp"]
```

### Other

```json
{
  "mcpServers": {
    "coo-quack-calc-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@coo-quack/calc-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.

### 2026-08-03 (score 77, +4)

- [functional improvement] Stability: unverified → 0.27

### 2026-08-02 (score 73, +37)

- [security improvement] Provenance: unverified → pass
- [security improvement] Install scripts: unverified → pass
- [security improvement] Known CVEs: unverified → partial
- [security] Stability: Stability not yet verified: not enough scan history yet (needs a 30-day window).
- [security] The attested source repository moved: coo-quack/calc-mcp
- [functional regression] License: unverified → fail
- [functional regression] Security disclosure: fail → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional improvement] Schema quality: unverified → excellent
- [functional improvement] Maintenance: unverified → pass
- [functional improvement] MCP protocol: unverified → pass
- [functional improvement] Dependency health: unverified → partial
- [functional] First check of Schema quality: unverified

### 2026-08-01 (score 36, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-07-31 (score 21, −25)

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

### 2026-07-27 (score 46)

First indexed and scored.

## MCP tools (21)

### `random` (~263 tokens)

Generate random values: UUID, ULID, secure password (with fine-grained options), random number, or shuffle a list

Input parameters:

- `charset` (string): Custom character set for password (overrides uppercase/numbers/symbols options)
- `excludeChars` (string): Characters to exclude from password (e.g. "\\|{}")
- `items` (array): Items to shuffle (for type=shuffle)
- `length` (integer): Length for password generation (default: 16)
- `max` (number): Maximum value for number generation (default: 100)
- `min` (number): Minimum value for number generation (default: 0)
- `numbers` (boolean): Include numbers in password (default: true)
- `readable` (boolean): Readable mode: excludes ambiguous characters (l/1/I/O/0/o) for easy reading
- `symbols` (boolean): Include symbols in password (default: true)
- `type` (string, required): Type of random value to generate: uuid, ulid, password, number, or shuffle
- `uppercase` (boolean): Include uppercase letters in password (default: true)
- `uuidVersion` (string): UUID version: v4 (random, default) or v7 (time-ordered)

### `hash` (~110 tokens)

Compute hash or HMAC of a string using MD5, SHA1, SHA256, SHA512, or CRC32. WARNING: MD5 and SHA1 are cryptographically broken and MUST NOT be used for security (use SHA-256 or SHA-512 instead).

Input parameters:

- `action` (string): Action: hash (default) or hmac
- `algorithm` (string, required): Hash algorithm to use
- `input` (string, required): String to hash
- `key` (string): Secret key for HMAC

### `base64` (~39 tokens)

Encode or decode Base64 strings

Input parameters:

- `action` (string, required): Whether to encode or decode
- `input` (string, required): String to encode or decode

### `encode` (~53 tokens)

Encode or decode strings using URL, HTML, or Unicode encoding

Input parameters:

- `action` (string, required): Whether to encode or decode
- `input` (string, required): String to encode or decode
- `type` (string, required): Encoding type

### `datetime` (~170 tokens)

Get current datetime, convert timezones, format dates, and convert UNIX timestamps

Input parameters:

- `action` (string, required): now: current datetime, convert: timezone conversion, format: reformat datetime, timestamp: unix↔ISO8601
- `datetime` (string): ISO8601 datetime string for convert/format
- `format` (string): Output format: iso, date, time, full, short, or date-fns pattern (e.g. yyyy/MM/dd HH:mm), or Intl JSON options
- `fromTimezone` (string): Source timezone for conversion
- `timestamp` (number): UNIX timestamp in seconds for timestamp action
- `timezone` (string): IANA timezone (e.g. Asia/Tokyo, America/New_York)
- `toTimezone` (string): Target timezone for conversion

### `count` (~50 tokens)

Count characters (grapheme clusters), words, lines, and bytes in text

Input parameters:

- `encoding` (string): Encoding for byte count (default: utf8)
- `text` (string, required): Text to analyze

### `math` (~54 tokens)

Evaluate math expressions or compute statistics on numbers

Input parameters:

- `action` (string): Action: eval (default) or statistics
- `expression` (string): Math expression to evaluate
- `values` (array): Array of numbers for statistics

### `date` (~93 tokens)

Date calculations: diff between dates, add to date, weekday, and Japanese wareki conversion

Input parameters:

- `action` (string, required): diff: date difference, add: add to date, weekday, wareki
- `amount` (number): Amount to add
- `date` (string, required): Date string (ISO8601)
- `date2` (string): Second date for diff
- `unit` (string): Unit for add

### `regex` (~78 tokens)

Test, match, matchAll, or replace using regular expressions

Input parameters:

- `action` (string, required): Action to perform
- `flags` (string): Regex flags (g, i, m, etc.)
- `pattern` (string, required): Regular expression pattern
- `replacement` (string): Replacement string for replace
- `text` (string, required): Text to search

### `base` (~61 tokens)

Convert numbers between bases (2-36), supports large numbers via BigInt

Input parameters:

- `from` (integer, required): Source base (2-36)
- `to` (integer, required): Target base (2-36)
- `value` (required): Value to convert (string or number)

### `diff` (~81 tokens)

Compare two texts: line-by-line diff (Myers algorithm, falls back to full replacement if edit distance exceeds 1000) or Levenshtein distance

Input parameters:

- `action` (string): diff: line diff (default), distance: Levenshtein distance
- `text1` (string, required): First text
- `text2` (string, required): Second text

### `format_validate` (~44 tokens)

Validate and parse JSON, CSV, XML, or YAML strings

Input parameters:

- `format` (string, required): Format to validate as
- `input` (string, required): String to validate/parse

### `cron_parse` (~73 tokens)

Parse cron expression and return next N execution times

Input parameters:

- `count` (integer): Number of next occurrences to return (default: 5, max: 100)
- `expression` (string, required): Cron expression (5 fields: min hour dom mon dow)
- `timezone` (string): IANA timezone (default: UTC)

### `luhn` (~50 tokens)

Validate or generate check digits using the Luhn algorithm

Input parameters:

- `action` (string): validate (default) or generate check digit
- `number` (string, required): Number string to validate or generate check digit for

### `ip` (~94 tokens)

IP address info, CIDR contains check, and range calculation

Input parameters:

- `action` (string, required): info: IP details, contains: check if IP in CIDR, range: CIDR range
- `cidr` (string): CIDR notation (e.g. 192.168.1.0/24)
- `ip` (string): IP address
- `target` (string): Target IP to check against CIDR

### `color` (~85 tokens)

Convert colors between HEX, RGB, and HSL formats

Input parameters:

- `color` (string, required): Color value: #hex (3/4/6/8 digits), rgb(r,g,b), rgba(r,g,b,a), hsl(h,s%,l%), hsla(h,s%,l%,a), or named color
- `to` (string): Target format (returns all if omitted)

### `convert` (~69 tokens)

Convert between units: length, weight, temperature, area, volume, speed, data, time

Input parameters:

- `category` (string): Category (auto-detected if omitted)
- `from` (string, required): Source unit
- `to` (string, required): Target unit
- `value` (number, required): Value to convert

### `char_info` (~35 tokens)

Get Unicode information about characters (code point, block, category)

Input parameters:

- `char` (string, required): Character(s) to get info about

### `jwt_decode` (~68 tokens)

Decode JWT token header and payload for inspection only. WARNING: this tool does NOT verify the signature; never trust the payload for authentication or authorization without separate signature verification using the issuer's verification key (shared secret or public key, depending on alg).

Input parameters:

- `token` (string, required): JWT token to decode

### `url_parse` (~35 tokens)

Parse a URL into its components (protocol, host, path, params, etc.)

Input parameters:

- `url` (string, required): URL to parse

### `semver` (~92 tokens)

Semantic versioning: compare, validate, and check range satisfaction

Input parameters:

- `action` (string, required): compare: compare two versions, valid: check validity, satisfies: range match, parse: extract components
- `range` (string): Version range for satisfies (e.g. ^1.0.0)
- `version` (string, required): Semver version string
- `version2` (string): Second version for compare

## Diagnostics

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

## Score history

- 2026-08-03: 77
- 2026-08-02: 73
- 2026-08-01: 36
- 2026-07-31: 21
- 2026-07-30: 46
- 2026-07-28: 46
- 2026-07-27: 46

## Links

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