@bultcloud/mcp-server

Official Model Context Protocol (MCP) server for Bult. It lets MCP clients manage Bult projects, services, volumes, routes, templates, deployments, logs, and builds through the Bult API.

Demo

Related MCP server: Railway MCP Server

Features

• Project lifecycle tools: list, inspect, create, update, delete, deploy, start, stop, and discard changes.

• Service management for daemon and database services, including Docker image and Git-based deployments.

• Persistent volumes, route/domain mappings, templates, service logs, and build history.

• MCP tool annotations for read-only, idempotent, and destructive operations where supported.

• Works over stdio with Claude Desktop, Claude Code, Cursor, Google Antigravity and other MCP-compatible clients.

Requirements

• Node.js 18 or newer.

• Bult API token.

Installation

If you install the package globally, use the bult-mcp binary:

npm install -g @bultcloud/mcp-server
bult-mcp

You can also run it with npx from MCP client configs:

npx -y @bultcloud/mcp-server

Configuration

The server reads its configuration from environment variables.

The server exits during startup if either variable is missing.

MCP Client Setup

Claude Desktop

Add the server to claude_desktop_config.json.

Using npx:

{
  "mcpServers": {
    "bult": {
      "command": "npx",
      "args": ["-y", "@bultcloud/mcp-server"],
      "env": {
        "BULT_API_URL": "https://app.bult.ai",
        "BULT_API_TOKEN": "your-token"
      }
    }
  }
}

Claude Code

Using npx:

claude mcp add bult \
  -e BULT_API_URL=https://app.bult.ai \
  -e BULT_API_TOKEN=your-token \
  -- npx -y @bultcloud/mcp-server

Codex CLI

Using npx:

codex mcp add \
  --env BULT_API_URL=https://app.bult.ai \
  --env BULT_API_TOKEN=your-token \
  bult \
  -- npx -y @bultcloud/mcp-server

Available Tools

Projects

Services

Volumes

Routes

Templates

Logs and Builds

Example Prompts

• Deploy this GitHub repo to Bult and give me the public URL.

• Deploy the current project to Bult.

• Check why my deployment failed.

• Show the latest logs for my app.

• Set DATABASE_URL and restart the service.

• Deploy this Docker image to Bult.

• List my Bult projects and services.

Development

npm run dev      # run with tsx, no build step
npm run build    # compile TypeScript to dist/
npm run lint     # type-check without emitting files

Project layout:

src/index.ts          MCP server entrypoint
src/client.ts         Bult API client
src/tools/*.ts        MCP tool registrations by resource type

Security

BULT_API_TOKEN grants access to your Bult resources. Keep it out of source control, shell history, issue reports, and screenshots. Prefer scoped or rotatable tokens when available.

Some tools can create, delete, deploy, stop, or wipe resources. Review tool calls from your MCP client before approving destructive actions.

Contributing

Issues and pull requests are welcome at github.com/bultcloud/mcp-server.

Before opening a pull request, run:

npm run lint
npm run build

License

This project is licensed under the MIT License.