MCP Servers

basic-mcp

Provides a suite of deterministic tools for time calculations, math, and string manipulation that LLMs often struggle to perform accurately. It also includes utilities for secure randomness, data validation, and basic network operations like DNS lookups.

README

basic-mcp

MCP server providing deterministic tools for operations that LLMs commonly struggle with: time, math, counting, randomness, and validation.

Installation

bun install

Usage

With Claude Code

Add to ~/.claude.json:

{
  "mcpServers": {
    "basic-tools": {
      "command": "bun",
      "args": ["run", "/path/to/basic-mcp/index.ts"]
    }
  }
}

Standalone

bun run index.ts

Tools

Time

Tool	Description
`now`	Get current date/time with timezone support
`date_diff`	Calculate difference between two dates
`date_add`	Add/subtract time from a date
`unix_timestamp`	Convert between Unix timestamps and dates

Math

Tool	Description
`calculate`	Evaluate math expressions (supports "15% of 200", sqrt, trig, etc.)
`convert_units`	Convert between units (km to miles, celsius to fahrenheit, etc.)
`statistics`	Calculate mean, median, mode, std dev, min, max, sum

Strings

Tool	Description
`count`	Count characters, words, lines, bytes, sentences, paragraphs
`hash`	Generate MD5, SHA1, SHA256, SHA512 hashes
`uuid`	Generate UUID v4
`base64`	Encode/decode base64
`regex_test`	Test strings against regex patterns

Random

Tool	Description
`random_int`	Cryptographically secure random integer
`random_float`	Cryptographically secure random float
`random_choice`	Select random item(s) from a list
`shuffle`	Randomly shuffle an array (Fisher-Yates)

Validation

Tool	Description
`validate`	Validate email, URL, IPv4, IPv6, UUID, JSON, credit card (Luhn)
`json_parse`	Parse JSON with optional path extraction
`url_parse`	Parse URL into components
`dns_lookup`	DNS lookup (A, AAAA, MX, TXT, NS, CNAME records)

License

MIT

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