Tolk MCP Server

tolk-mcp-server

MCP server for the Tolk smart contract compiler. Compile, validate, and explore TON smart contracts from any MCP-compatible AI assistant (Claude Desktop, Cursor, Windsurf, etc.).

Features

Tools:

• get_compiler_version — Returns the Tolk compiler version
• compile_tolk — Compiles Tolk source code to Fift + BoC with full compiler options (optimization level, stack comments, experimental flags)
• check_tolk_syntax — Quick syntax validation without full output

Resources:

• tolk://reference — Tolk language quick reference (syntax, types, differences from FunC)
• tolk://examples/hello-world — Counter contract example
• tolk://examples/wallet — Wallet contract example
• tolk://examples/jetton — Jetton (token) contract skeleton

Prompts:

• write_smart_contract — Guided prompt for writing a new TON smart contract
• review_smart_contract — Guided prompt for security review and optimization analysis

Quick Start

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "tolk": {
      "command": "npx",
      "args": ["-y", "tolk-mcp-server"]
    }
  }
}

Cursor / Windsurf

Add to your MCP settings:

{
  "tolk": {
    "command": "npx",
    "args": ["-y", "tolk-mcp-server"]
  }
}

From Source

git clone https://github.com/oxgeneral/tolk-mcp-server.git
cd tolk-mcp-server
npm install
npm run build
npm start

Usage Examples

Compile a contract

> Use the compile_tolk tool to compile this contract:

fun onInternalMessage(myBalance: int, msgValue: int, msgFull: cell, msgBody: slice) {
}

get fun hello(): int {
    return 42;
}

The tool returns:

• Fift assembly code
• BoC (Bag of Cells) in base64 — ready for deployment
• Code hash — unique identifier of the compiled code
• Warnings (if any)

Check syntax quickly

> Use check_tolk_syntax to validate my contract before deploying

Returns OK + code hash, or a detailed error with line/column info.

Multi-file contracts

Pass all files in the sources parameter:

{
  "entrypointFileName": "main.tolk",
  "sources": {
    "main.tolk": "import \"./utils.tolk\";\nfun onInternalMessage(...) { ... }",
    "utils.tolk": "fun helper(): int { return 1; }"
  }
}

Standard library imports (@stdlib/*) are resolved automatically by the compiler.

Compiler Options

Option	Type	Default	Description
optimizationLevel	0-2	2	0 = none, 1 = basic, 2 = full
withStackComments	bool	false	Add stack layout comments to Fift output
experimentalOptions	string	""	Space-separated experimental compiler flags

Requirements

• Node.js >= 18
• No external dependencies beyond npm packages

Development

npm install
npm run dev    # Run with tsx (hot reload)
npm run build  # Compile TypeScript
npm test       # Run tests

License

MIT