Midnight MCP Server

MCP server that gives AI assistants access to Midnight blockchain—search contracts, analyze code, and explore documentation.

This project extends the Midnight Network with additional developer tooling.

Requirements

• Node.js 20+ (LTS recommended)

Check your version: node --version

If you use nvm, Claude Desktop may not see your nvm-managed Node. Use this config instead:

{
  "mcpServers": {
    "midnight": {
      "command": "/bin/sh",
      "args": [
        "-c",
        "source ~/.nvm/nvm.sh && nvm use 20 >/dev/null 2>&1 && npx -y midnight-mcp@latest"
      ]
    }
  }
}

Related MCP server: thegraph-mcp

Quick Start

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "midnight": {
      "command": "npx",
      "args": ["-y", "midnight-mcp@latest"]
    }
  }
}

Config file locations:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

• Windows: %APPDATA%\Claude\claude_desktop_config.json

• Linux: ~/.config/Claude/claude_desktop_config.json

Cursor

One-click install:

Or manually add to .cursor/mcp.json:

{
  "mcpServers": {
    "midnight": {
      "command": "npx",
      "args": ["-y", "midnight-mcp@latest"]
    }
  }
}

VS Code Copilot

Add to .vscode/mcp.json or use Command Palette: MCP: Add Server → "command (stdio)" → npx -y midnight-mcp@latest

Windsurf

Add to ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "midnight": {
      "command": "npx",
      "args": ["-y", "midnight-mcp@latest"]
    }
  }
}

No API keys required. Restart your editor after adding the config.

Why @latest? Unlike cached npx packages that never auto-update, @latest ensures you get new features and fixes on each restart. If upgrading from an older config without @latest, also clear your npx cache: rm -rf ~/.npm/_npx

What's Included

29 Tools

All tools are prefixed with midnight- (e.g., midnight-search-compact).

Real Contract Compilation

The midnight-compile-contract tool validates Compact code using a hosted compiler service:

✅ Compilation successful (Compiler v0.29.0) in 2841ms

• Fast mode (skipZk=true): Syntax validation in ~1-2 seconds

• Full mode (fullCompile=true): Complete ZK circuit generation in ~10-30 seconds

• Automatic fallback: Falls back to static analysis if the compiler service is unavailable

This catches semantic errors that static analysis misses (sealed fields, disclose rules, type mismatches).

MCP Capabilities

9 Embedded Resources

Quick references available offline:

• Compact syntax guide (v0.16-0.21)

• SDK API reference

• OpenZeppelin contracts

• Tokenomics overview

• Wallet integration

• Common errors & solutions

Static Analysis

extract-contract-structure catches common mistakes before compilation:

5 Prompts

• create-contract — Generate new contracts

• review-contract — Security and code review

• explain-concept — Learn Midnight concepts

• compare-approaches — Compare implementation patterns

• debug-contract — Troubleshoot issues

Indexed Repositories

The API indexes 115+ Midnight repositories from the entire Midnight ecosystem:

All non-archived repositories from the midnightntwrk organization plus community partners. See api/README.md for the complete list.

Advanced Configuration

HTTP Mode

Run as an HTTP server for web integrations or remote deployment:

# Start HTTP server on port 3000
npx midnight-mcp --http --port 3000

Endpoints:

• /health - Health check

• /mcp - Streamable HTTP (MCP protocol)

• /sse - Server-Sent Events

CLI Options

npx midnight-mcp --help

Options:
  --stdio          Use stdio transport (default, for Claude Desktop)
  --http           Use HTTP transport with SSE support
  --port <number>  HTTP port (default: 3000)
  --json           Output in JSON (default: YAML for better LLM efficiency)
  --github-token   GitHub token (overrides GITHUB_TOKEN env var)
  -h, --help       Show help
  -v, --version    Show version

Why YAML by default? YAML is ~20-30% more token-efficient than JSON, which means AI assistants can process more context from tool responses.

Local Mode

Run everything locally for privacy or offline use:

{
  "mcpServers": {
    "midnight": {
      "command": "npx",
      "args": ["-y", "midnight-mcp@latest"],
      "env": {
        "MIDNIGHT_LOCAL": "true",
        "OPENAI_API_KEY": "sk-...",
        "CHROMA_URL": "http://localhost:8000"
      }
    }
  }
}

Requires ChromaDB (docker run -d -p 8000:8000 chromadb/chroma) and OpenAI API key.

GitHub Token

Add "GITHUB_TOKEN": "ghp_..." for higher GitHub API rate limits (60 → 5000 requests/hour).

Developer Setup

git clone https://github.com/Olanetsoft/midnight-mcp.git && cd midnight-mcp
npm install && npm run build && npm test

# Lint & format
npm run lint          # ESLint (typescript-eslint)
npm run lint:fix      # Auto-fix lint issues
npm run format        # Prettier

The hosted API runs on Cloudflare Workers + Vectorize. See api/README.md for backend details.

Links

• Midnight Docs

• MCP Spec

• Midnight GitHub

License

MIT

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