Midnight MCP Server

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

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"
      ]
    }
  }
}

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

27 Tools

| Category | Tools | Description | | ----------------- | --------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------ | | Search | search-compact, search-typescript, search-docs | Semantic search across Midnight codebase | | Analysis | analyze-contract, explain-circuit, extract-contract-structure | Static analysis with 15+ checks (P0-P2 severity) | | Repository | get-file, list-examples, get-latest-updates | Access files and examples | | Versioning | get-version-info, check-breaking-changes, get-migration-guide, get-file-at-version, compare-syntax, get-latest-syntax | Version tracking and migration | | AI Generation | generate-contract, review-contract, document-contract | AI-powered code generation (requires sampling) | | Compound | upgrade-check, get-repo-context | Multi-step operations (saves 50-70% tokens) | | Health | health-check, get-status, check-version | Server status and version checking | | Discovery | list-tool-categories, list-category-tools, suggest-tool | Explore available tools and get recommendations |

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

MCP Capabilities

| Capability | Feature | | --------------- | ----------------------------------------------- | | Tools | 27 tools with listChanged notifications | | Resources | 9 embedded resources with subscription support | | Prompts | 5 workflow prompts | | Logging | Client-controllable log level | | Completions | Autocomplete for prompt arguments | | Progress | Real-time progress for compound tools | | Sampling | AI-powered generation (when client supports it) |

9 Embedded Resources

Quick references available offline:

• Compact syntax guide (v0.16-0.18)
• SDK API reference
• OpenZeppelin contracts
• Tokenomics overview
• Wallet integration
• Common errors & solutions

Static Analysis

extract-contract-structure catches common mistakes before compilation:

| Check | Severity | Description | | ------------------------- | -------- | ------------------------------------------------------- | | deprecated_ledger_block | P0 | Catches ledger { } → use export ledger field: Type; | | invalid_void_type | P0 | Catches Void → use [] (empty tuple) | | invalid_pragma_format | P0 | Catches old pragma → use >= 0.16 && <= 0.18 | | unexported_enum | P1 | Enums need export for TypeScript access | | module_level_const | P0 | Use pure circuit instead | | + 10 more checks | P1-P2 | Overflow, division, assertions, etc. |

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 39 Midnight repositories:

| Category | Repositories | | --------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Core | compact, midnight-js, midnight-wallet, midnight-docs, midnight-node, midnight-indexer, midnight-ledger, midnight-zk | | Examples | example-counter, example-bboard, example-dex, create-mn-app | | Infrastructure | midnight-node-docker, midnight-dapp-connector-api, compact-tree-sitter, setup-compact-action | | Partner Libraries | OpenZeppelin/compact-contracts, OpenZeppelin/midnight-apps (LunarSwap) | | Official Partners | bricktowers/midnight-seabattle, bricktowers/midnight-identity, bricktowers/midnight-rwa, MeshJS/midnight-starter-template, midnames/core | | Core Partner | PaimaStudios/midnight-game-2, PaimaStudios/midnight-wasm-prover, PaimaStudios/midnight-batcher, PaimaStudios/midnight-impact-rps-example | | Hackathon Winners | Sea Battle: ErickRomeroDev/naval-battle-game_v2, eddex/midnight-sea-battle-hackathon • Mini DApp: statera-protocol, nel349/midnight-bank, Imdavyking/zkbadge |

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

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

Links

• Midnight Docs
• MCP Spec
• Midnight GitHub

License

MIT

Thanks to all Stargazers ⭐️