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iz-tolk-mcp

MCP server for the Tolk smart contract compiler — compile, check, and deploy TON blockchain smart contracts from any AI assistant

🇷🇺 Русский | 🇬🇧 English

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MCP server that brings the Tolk smart contract compiler directly into AI assistants like Claude — write, compile, check, and deploy TON contracts without leaving the conversation.

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📖 Overview

iz-tolk-mcp is a Model Context Protocol (MCP) server that integrates the Tolk smart contract compiler into AI assistants, enabling a seamless write-compile-deploy workflow for TON blockchain development.

• Tolk is the next-generation smart contract language for the TON blockchain, designed as a modern successor to FunC with familiar syntax (C/TypeScript-like), type safety, and cleaner semantics.
• MCP (Model Context Protocol) is an open standard that lets AI assistants use external tools, access data sources, and follow guided workflows — turning them into capable development environments.

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✨ Features

Feature	Description
🔨 4 MCP Tools	compile_tolk, check_tolk_syntax, get_compiler_version, generate_deploy_link
📄 6 MCP Resources	Language guide, stdlib reference, changelog, FunC migration guide, example contracts
💬 3 MCP Prompts	Guided workflows for writing, reviewing, and debugging smart contracts
⚙️ Full Compiler Options	Optimization levels (0-2), stack comments, multi-file compilation
📦 Multi-file Support	Compile projects with multiple .tolk source files and @stdlib/* imports
🔗 Deployment Links	Generate ton:// deeplinks and Tonkeeper URLs for wallet deployment
🚀 Zero Configuration	Runs via npx with no external dependencies beyond Node.js

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🚀 Quick Start

npx iz-tolk-mcp

The server communicates over stdio and is designed to be launched by an MCP client.

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📦 Installation

Using npx (no install needed)

MCP clients launch the server automatically — just add it to your configuration (see below).

Global install

npm install -g iz-tolk-mcp

From source

git clone https://github.com/izzzzzi/izTolkMcp.git
cd izTolkMcp
npm install
npm run build

Requirement: Node.js >= 18

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🔧 MCP Client Configuration

<details> <summary><b>Claude Desktop</b></summary>

Add to claude_desktop_config.json:

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

</details>

<details> <summary><b>Claude Code</b></summary>

claude mcp add tolk -- npx -y iz-tolk-mcp

</details>

<details> <summary><b>Cursor</b></summary>

Add to .cursor/mcp.json:

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

</details>

<details> <summary><b>Windsurf</b></summary>

Add to ~/.windsurf/mcp.json:

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

</details>

<details> <summary><b>VS Code (Copilot)</b></summary>

Add to .vscode/mcp.json:

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

</details>

<details> <summary><b>Local build (any client)</b></summary>

{
  "mcpServers": {
    "tolk": {
      "command": "node",
      "args": ["/absolute/path/to/izTolkMcp/dist/index.js"]
    }
  }
}

</details>

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🛠️ MCP Tools

🔍 get_compiler_version

Returns the version of the Tolk compiler bundled in @ton/tolk-js (WASM).

Parameter	Type	Required	Description
(none)	—	—	No parameters

🔨 compile_tolk

Compiles Tolk smart contract source code. Returns Fift output, BoC (Bag of Cells) in base64, and the code hash.

Parameter	Type	Required	Description
entrypointFileName	string	✅	The main .tolk file to compile (e.g., "main.tolk")
sources	object	✅	Map of filename -> source code. Must include the entrypoint file.
optimizationLevel	number	—	Optimization level 0-2 (default: 2)
withStackComments	boolean	—	Include stack layout comments in Fift output

✅ check_tolk_syntax

Checks Tolk source code for syntax and type errors without returning full compilation output. Faster feedback loop for iterative development.

Parameter	Type	Required	Description
entrypointFileName	string	✅	The main .tolk file to check
sources	object	✅	Map of filename -> source code

🔗 generate_deploy_link

Generates TON deployment deeplinks for a compiled contract. Computes the deterministic contract address and returns ton:// and Tonkeeper links ready for wallet deployment.

Parameter	Type	Required	Description
codeBoc64	string	✅	Base64-encoded BoC of compiled contract code (from compile_tolk)
initialDataBoc64	string	—	Base64-encoded BoC for initial data cell (default: empty cell)
workchain	number	—	Target workchain ID (default: 0)
amount	string	—	Deploy amount in nanoTON (default: "50000000" = 0.05 TON)

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📄 MCP Resources

Resource	URI	Description
📘 language-guide	tolk://docs/language-guide	Complete Tolk language syntax reference
📗 stdlib-reference	tolk://docs/stdlib-reference	Standard library modules and functions reference
📋 changelog	tolk://docs/changelog	Tolk compiler version history from v0.6 to latest
🔄 tolk-vs-func	tolk://docs/tolk-vs-func	FunC to Tolk migration guide — key differences and comparison
📝 example-counter	tolk://examples/counter	Simple counter smart contract example in Tolk
💎 example-jetton	tolk://examples/jetton	Jetton (fungible token) minter contract example in Tolk

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💬 MCP Prompts

write_smart_contract

Guided workflow for writing a new Tolk smart contract on TON. Injects the language reference and a relevant example contract into the conversation context.

Argument	Type	Required	Description
description	string	✅	Description of what the smart contract should do
contractType	string	—	"counter" | "jetton" | "nft" | "wallet" | "custom" (default: "custom")

review_smart_contract

Security-focused review of a Tolk smart contract. Checks for access control, message handling, integer overflow, gas management, storage integrity, and TON-specific vulnerabilities.

Argument	Type	Required	Description
code	string	✅	The Tolk smart contract source code to review

debug_compilation_error

Diagnose and fix a Tolk compilation error. Analyzes the error against the language reference and provides corrected code.

Argument	Type	Required	Description
errorMessage	string	✅	The compilation error message from the Tolk compiler
code	string	✅	The Tolk source code that failed to compile

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💡 Usage Examples

Once configured, interact with the Tolk MCP server through natural language in your AI assistant:

Compile a contract:

"Compile this Tolk smart contract:"

import "@stdlib/tvm-dicts";

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

Write a new contract from scratch:

"Write a simple counter contract for TON that stores a number and lets anyone increment it. Include a getter to read the current value."

Review an existing contract:

"Review this contract for security issues" (paste code)

Debug a compilation error:

"I'm getting this error when compiling: unexpected token 'fun' — here's my code:" (paste code)

Generate a deploy link:

"Generate a deployment link for the contract we just compiled."

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📁 Project Structure

src/
├── index.ts        — Server initialization and stdio transport
├── tools.ts        — 4 MCP tools (compile, check, version, deploy)
├── resources.ts    — 6 MCP resources (docs, examples)
├── prompts.ts      — 3 MCP prompts (write, review, debug)
└── content/        — Bundled documentation and example contracts
    ├── language-guide.md
    ├── stdlib-reference.md
    ├── changelog.md
    ├── tolk-vs-func.md
    ├── example-counter.tolk
    └── example-jetton.tolk

Key dependencies:

• @modelcontextprotocol/sdk — MCP server framework
• @ton/tolk-js — Tolk compiler (WASM, runs locally)
• @ton/core — TON primitives for address computation and cell serialization
• zod — Schema validation for tool parameters

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🧑‍💻 Development

npm install          # Install dependencies
npm run build        # Compile TypeScript + copy content files
npm run dev          # Run with tsx (hot reload for development)
npm test             # Run test suite (vitest)
npm run lint         # Check for lint errors
npm run lint:fix     # Fix lint errors automatically
npm run format       # Format code with Biome

Pre-commit hooks enforce code quality automatically:

• Biome — fast linter and formatter for TypeScript
• Husky — Git hooks manager
• lint-staged — runs checks only on staged files