LEGO Oracle

LEGO sets, parts, minifigs, and inventories. An MCP server.

---

Ask your AI assistant about LEGO sets, find specific bricks, look up minifigures, browse themes, and compare sets. All backed by Rebrickable's catalog (26k sets, 62k parts, 17k minifigs), not hallucinations.

10 tools. Zero config. Works with every MCP-compatible IDE.

Install

npx -y lego-oracle

Add to your IDE

Claude Code

claude mcp add lego-oracle -- npx -y lego-oracle

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%/Claude/claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "lego-oracle": {
      "command": "npx",
      "args": ["-y", "lego-oracle"]
    }
  }
}

Cursor

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "lego-oracle": {
      "command": "npx",
      "args": ["-y", "lego-oracle"]
    }
  }
}

VS Code (Copilot)

Add to .vscode/mcp.json:

{
  "servers": {
    "lego-oracle": {
      "command": "npx",
      "args": ["-y", "lego-oracle"]
    }
  }
}

Windsurf

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

{
  "mcpServers": {
    "lego-oracle": {
      "command": "npx",
      "args": ["-y", "lego-oracle"]
    }
  }
}

Zed

Add to settings.json:

{
  "context_servers": {
    "lego-oracle": {
      "command": {
        "path": "npx",
        "args": ["-y", "lego-oracle"]
      }
    }
  }
}

Tools

Set Tools

Tool	Description
search_sets	Search for sets by name, theme, year, or piece count. Full-text search with filters.
get_set	Get complete set details: inventory (grouped by part category), minifigures, theme hierarchy.
compare_sets	Compare 2-4 sets side by side: piece count, year, theme, minifigs, shared parts.

Part Tools

Tool	Description
search_parts	Search parts by name, category, colour, or material.
get_part	Get part details including available colours and mold/print variants.
find_part_in_sets	Find which sets contain a specific part (optionally in a specific colour), sorted by quantity.

Minifig Tools

Tool	Description
search_minifigs	Search minifigures by name.
get_minifig	Get minifig details and every set it appears in.

Discovery Tools

Tool	Description
browse_themes	Browse the LEGO theme hierarchy. Top-level themes or drill into sub-themes with set counts.
find_mocs	Find community alternate builds (MOCs) for a set's parts.

Data

All data is embedded at build time from Rebrickable. No network calls at runtime.

Category	Count
Sets	26,339
Parts	61,702
Colours	275
Minifigures	16,646
Inventory entries	1,483,652
Part relationships	35,757
Themes	490

Data is updated daily via GitHub Actions. New npm versions are published automatically when Rebrickable data changes.

Development

npm install
npm run build
npm test             # 141 tests

To refresh data from Rebrickable:

npm run fetch-data
npm run build

Attribution

Data from Rebrickable. LEGO is a trademark of the LEGO Group. This project is not produced by or endorsed by the LEGO Group.

License

MIT