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io.github.kira-autonoma/devtools

Official registry Developer tools

23 developer utilities — base64, JWT, UUID, hash, QR, regex, timestamps. No API keys.

Source code Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package mcp-devtools-server
Claude Code 
claude mcp add devtools -- npx -y mcp-devtools-server@1.0.1
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "devtools": {
            "command": "npx",
            "args": [
                "-y",
                "mcp-devtools-server@1.0.1"
            ]
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. devtools-mcp 🛠️
  2. Quick Start
  3. 23 Tools Included
  4. Examples
  5. Why devtools-mcp?
  6. Development
  7. Support This Project

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
claude mcp add devtools -- npx mcp-devtools-server
Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "devtools": {
      "command": "npx",
      "args": ["devtools-mcp"]
    }
  }
}
Cursor / VS Code

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

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

No API keys. No configuration. Just works.

23 Tools Included

Encoding & Decoding
ToolDescription
base64_encodeEncode text to Base64
base64_decodeDecode Base64 to text
url_encodeURL-encode a string
url_decodeDecode URL-encoded string
html_encodeHTML-encode special characters
html_decodeDecode HTML entities
Cryptography & Hashing
ToolDescription
hashGenerate hash (MD5, SHA1, SHA256, SHA512)
hmacGenerate HMAC signature
jwt_decodeDecode JWT token (header, payload, expiry)
Generation
ToolDescription
uuidGenerate UUID v4 (1-100 at once)
random_stringRandom hex, base64, or alphanumeric strings
qr_generateGenerate QR code as PNG image
JSON
ToolDescription
json_formatPretty-print or minify JSON
json_diffDeep-compare two JSON objects
Date & Time
ToolDescription
timestampConvert Unix ↔ ISO dates, relative time
Text & Regex
ToolDescription
regex_testTest regex with matches and capture groups
text_statsCharacter, word, line, token count
text_diffLine-by-line text comparison
Numbers & Units
ToolDescription
number_baseConvert between binary, octal, decimal, hex
byte_convertConvert between B, KB, MB, GB, TB (SI & IEC)
color_convertConvert hex ↔ RGB ↔ HSL colors
Web & System
ToolDescription
http_statusLook up HTTP status code meaning
cron_explainExplain 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

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.

Frequently asked questions

What is io.github.kira-autonoma/devtools?

23 developer utilities — base64, JWT, UUID, hash, QR, regex, timestamps. No API keys.

How do I install io.github.kira-autonoma/devtools?

It runs on your machine. In Claude Code: claude mcp add devtools -- npx -y mcp-devtools-server@1.0.1. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.kira-autonoma/devtools need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is io.github.kira-autonoma/devtools open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains io.github.kira-autonoma/devtools?

It is published by kira-autonoma. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.