Parseltongue MCP Server 🐍

A Model Context Protocol (MCP) server providing direct text encoding tools plus a consumer bridge for the current P4RS3LT0NGV3 transform catalog.

Features

🧬 P4RS3LT0NGV3 Consumer Bridge

• list_p4rs_transforms: Discover transforms from the local P4RS3LT0NGV3/src/transformers tree.
• apply_p4rs_transform: Apply any discovered P4RS transform by id or display name.
• decode_p4rs_transform: Decode/reverse any discovered reversible transform.
• Set P4RS3LT0NGV3_PATH if the repo is not at ~/git/P4RS3LT0NGV3.

🔤 Custom Spelling Alphabets

• encode_spelling_alphabet: Encode text with a custom ICAO-style A-Z alphabet JSON map.
• decode_spelling_alphabet: Decode spelling-alphabet text back to letters.

🔳 QR Codes & Barcodes

• generate_qr_code_svg and generate_qr_code_data_uri for QR code generation.
• generate_barcode_svg for Code 128, Code 39, and EAN-13 SVG generation.

📦 Basic Encodings (22 tools)

• Base64: Encode/decode Base64
• Base64URL: Encode/decode Base64 URL-safe format
• Base32: Encode/decode Base32
• Base58: Encode/decode Base58 (Bitcoin-style)
• Base62: Encode/decode Base62
• Base45: Encode/decode Base45
• ASCII85: Encode/decode ASCII85
• Hexadecimal: Encode/decode hex
• Binary: Encode/decode 8-bit binary
• URL Encoding: Percent encoding for URLs
• HTML Entities: Encode/decode HTML entities

🔐 Ciphers (8 tools)

• ROT13: Classic rotation cipher (encode/decode)
• Caesar Cipher: Custom shift cipher (encode/decode)
• Atbash: Reverse alphabet substitution (encode/decode)
• Morse Code: Encode/decode to Morse code

🎨 Unicode Transformations (6 tools)

• Zalgo Text: Glitch effect with combining marks
• Upside Down: Flip text using Unicode
• Bubble Text: Circle-enclosed letters (Ⓐⓑⓒ)
• Full Width: Vaporwave aesthetic (ｆｕｌｌ　ｗｉｄｔｈ)
• Strikethrough: S̶t̶r̶i̶k̶e̶t̶h̶r̶o̶u̶g̶h̶
• Underline: U̲n̲d̲e̲r̲l̲i̲n̲e̲d̲

🕵️ Steganography (3 tools)

• Zero-Width Encoding: Hide text using invisible Unicode characters (encode/decode)
• Invisible Ink: Hide messages within cover text

🔧 Utilities (2 tools)

• Reverse Text: Simple string reversal
• Pig Latin: Classic word game transformation

Installation

# Clone the repository
git clone 
cd parseltongue_mcp

# Install dependencies using uv
uv sync

# Or using pip
pip install -e .

Usage

As an MCP Server

Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

{
  "mcpServers": {
    "parseltongue": {
      "command": "uv",
      "args": [
        "--directory",
        "(Full path)/parseltongue_mcp",
        "run",
        "parseltongue-mcp"
      ]
    }
  }
}

Running Directly

# Using uv
uv run parseltongue-mcp

# Or with python
python main.py

Available Tools

Encoding Examples

# Base64
encode_base64(text="Hello World")
# Returns: "SGVsbG8gV29ybGQ="

# Base64URL (URL-safe)
encode_base64url(text="Hello World")
# Returns: "SGVsbG8gV29ybGQ="

# Base58 (Bitcoin-style)
encode_base58(text="Hello")
# Returns: "9Ajdvzr"

# Base62
encode_base62(text="Hello")
# Returns: "5TP3P3v"

# Base45
encode_base45(text="Hello")
# Returns: "JBSWY3DP"

# ASCII85
encode_ascii85(text="Hello")
# Returns: "87cURD]i"

# Morse Code
encode_morse(text="SOS")
# Returns: "... --- ..."

# Binary
encode_binary(text="Hi")
# Returns: "01001000 01101001"

# Hexadecimal
encode_hex(text="Hi")
# Returns: "4869"

# Zero-Width (Steganography)
encode_zero_width(text="secret")
# Returns invisible Unicode characters

Cipher Examples

# ROT13
encode_rot13(text="Hello World")
# Returns: "Uryyb Jbeyq"

# Caesar Cipher with custom shift
encode_caesar(text="Attack at dawn", shift=5)
# Returns: "Fyyfhp fy ifbs"

# Atbash
encode_atbash(text="SECRET")
# Returns: "HVXIVG"

Unicode Transformation Examples

# Zalgo Text
encode_zalgo(text="Chaos", intensity="high")
# Returns: C̴̢̛͇̽h̵͎̓a̸̰͊ö̶́̚s̸̰̈

# Upside Down
encode_upside_down(text="Hello")
# Returns: "olləH"

# Bubble Text
encode_bubble_text(text="Hello")
# Returns: "Ⓗⓔⓛⓛⓞ"

# Full Width
encode_fullwidth(text="Wave")
# Returns: "Ｗａｖｅ"

# Strikethrough
encode_strikethrough(text="Cancelled")
# Returns: "C̶a̶n̶c̶e̶l̶l̶e̶d̶"

# Underline
encode_underline(text="Important")
# Returns: "I̲m̲p̲o̲r̲t̲a̲n̲t̲"

Tool Categories

All tools are exposed as MCP tools with detailed descriptions and type hints:

Development

# Install development dependencies
uv sync

# Run the server in development mode
uv run python main.py

# Test with MCP inspector
npx @modelcontextprotocol/inspector uv run python main.py

Technical Details

• Framework: FastMCP (MCP Python SDK)
• Python Version: 3.12+
• Dependencies:
  • mcp[cli]>=1.16.0 - MCP server framework
  • httpx>=0.28.1 - HTTP client (for potential future features)
  • qrcode[pil]>=8.0 and pillow>=10.0.0 - QR PNG/SVG generation
  • python-barcode>=0.15.1 - Code 128, Code 39, and EAN-13 SVG generation

Credits

Inspired by P4RS3LT0NGV3.

License

Open source. See LICENSE file for details.

Contributing

Contributions welcome. Useful areas to expand:

• Native wrappers for high-use P4RS bridge transforms.
• QR/barcode image decoding parity with the browser app.
• More structured batch transform chains.
• Better diagnostics when the local P4RS checkout is stale relative to the hosted app.

Examples in Action

Hiding Messages

# Create invisible message
hidden = encode_zero_width(text="TOP SECRET")
visible = f"This is a normal message{hidden}"
# Looks like: "This is a normal message"
# But contains hidden text!

# Decode it
decode_zero_width(encoded_text=hidden)
# Returns: "TOP SECRET"

Text Styling

# Create stylized text for social media
normal = "AWESOME"
bubble = encode_bubble_text(text=normal)      # ⒶⓌⒺⓈⓄⓂⒺ
wide = encode_fullwidth(text=normal)          # ＡＷＥＳＯＭＥ
zalgo = encode_zalgo(text=normal)             # A̴W̸E̵S̶O̴M̵E̸
strike = encode_strikethrough(text=normal)    # A̶W̶E̶S̶O̶M̶E̶
underline = encode_underline(text=normal)     # A̲W̲E̲S̲O̲M̲E̲
upside = encode_upside_down(text=normal)      # ƎWOSƎפ∀

Classic Ciphers

# Encode a message with Caesar cipher
message = "Meet at the park"
encoded = encode_caesar(text=message, shift=7)
# Returns: "Tlla ha aol whyr"

# Decode it
decode_caesar(text=encoded, shift=7)
# Returns: "Meet at the park"

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