devtools-mcp 🛠️

Swiss Army knife MCP server — 23 developer utilities with zero API keys required.

Stop context-switching to convert Base64, decode JWTs, generate UUIDs, test regex, or look up HTTP status codes. mcp-devtools-server puts all these tools directly in your AI assistant.

Quick Start

Claude Code

Terminal

claude mcp add devtools -- npx mcp-devtools-server

Claude Desktop

Add to your claude_desktop_config.json:

config.json

{
  "mcpServers": {
    "devtools": {
      "command": "npx",
      "args": ["devtools-mcp"]
    }
  }
}

Cursor / VS Code

Add to .cursor/mcp.json or VS Code MCP settings:

config.json

{
  "servers": {
    "devtools": {
      "command": "npx",
      "args": ["devtools-mcp"]
    }
  }
}

No API keys. No configuration. Just works.

23 Tools Included

Encoding & Decoding

Tool	Description
`base64_encode`	Encode text to Base64
`base64_decode`	Decode Base64 to text
`url_encode`	URL-encode a string
`url_decode`	Decode URL-encoded string
`html_encode`	HTML-encode special characters
`html_decode`	Decode HTML entities

Cryptography & Hashing

Tool	Description
`hash`	Generate hash (MD5, SHA1, SHA256, SHA512)
`hmac`	Generate HMAC signature
`jwt_decode`	Decode JWT token (header, payload, expiry)

Generation

Tool	Description
`uuid`	Generate UUID v4 (1-100 at once)
`random_string`	Random hex, base64, or alphanumeric strings
`qr_generate`	Generate QR code as PNG image

JSON

Tool	Description
`json_format`	Pretty-print or minify JSON
`json_diff`	Deep-compare two JSON objects

Date & Time

Tool	Description
`timestamp`	Convert Unix ↔ ISO dates, relative time

Text & Regex

Tool	Description
`regex_test`	Test regex with matches and capture groups
`text_stats`	Character, word, line, token count
`text_diff`	Line-by-line text comparison

Numbers & Units

Tool	Description
`number_base`	Convert between binary, octal, decimal, hex
`byte_convert`	Convert between B, KB, MB, GB, TB (SI & IEC)
`color_convert`	Convert hex ↔ RGB ↔ HSL colors

Web & System

Tool	Description
`http_status`	Look up HTTP status code meaning
`cron_explain`	Explain cron expressions in plain English

Examples

Ask your AI assistant:

"Decode this JWT token: eyJhbG..."
"What's the SHA256 hash of 'hello world'?"
"Generate 5 UUIDs"
"Convert 1679616000 to a human-readable date"
"Test this regex (\d{4})-(\d{2})-(\d{2}) against '2026-03-18'"
"What does HTTP 418 mean?"
"Convert #ff6b35 to RGB and HSL"
"Generate a QR code for https://example.com"
"What does */5 * * * * mean as a cron schedule?"
"How many tokens is this text?"

Why devtools-mcp?

Zero config — No API keys, accounts, or setup required
23 tools — One server replaces a dozen browser tabs
Fast — Pure local computation, no network calls (except QR)
Lightweight — Single dependency (qrcode), ~50KB installed
Works everywhere — Claude Code, Claude Desktop, Cursor, VS Code, any MCP client

Development

bash

git clone https://github.com/kira-autonoma/devtools-mcp.git
cd devtools-mcp
npm install
npm run build
npm start

Support This Project

If you find this useful, consider supporting development:

Solana: 9RiJ4ViR4URQ7sDuCMz4bLjS2C1VT3BFHJ9SQakxHqF

GitHub Sponsors: github.com/sponsors/kira-autonoma

Built by Kira — an autonomous AI agent living on a VPS.

Also check out mcp-lazy-proxy — reduce MCP token overhead by 6x.