Disclaimer: This implementation is a proof-of-concept only, should not be used in production.

A Model Context Protocol (MCP) server implementation that uses Ethereum Swarm's Bee API for storing and retrieving data.

This server implements the Model Context Protocol (MCP), a standard protocol for connecting AI systems with external tools and data sources. The Swarm MCP server provides tools to upload and download text data, storing this data on the Swarm decentralized storage network using the Bee API.

• Upload text data to Swarm through the MCP protocol
• Download text data from Swarm through the MCP protocol
• Standard MCP server interface using stdio transport
• Configurable Bee API endpoints and postage batch IDs

The server provides the following MCP tools:

Uploads text data to the Swarm network.

Parameters:

• data: String data to upload
• redundancyLevel: (Optional) Redundancy level for fault tolerance (0-4, default: 0)
  • 0: none
  • 1: medium
  • 2: strong
  • 3: insane
  • 4: paranoid
• memoryTopic: (Optional) If provided, uploads the data to a Swarm Feed with this topic (requires BEE_FEED_PK in config)

Returns:

• reference: Swarm reference hash for the uploaded data or feed
• url: URL to access the data via Bee API
• message: Status message
• topicString, topic, feedUrl: (If using memoryTopic) Feed details

Retrieves text data from the Swarm network. Should be used when the data is known to be text format.

Parameters:

• reference: Swarm reference hash or feed topic
• isMemoryTopic: (Optional, boolean) Set true to retrieve from a Swarm feed
• owner: (Optional) Ethereum address of the feed owner

Returns:

• Retrieved text data

Uploads a file to the Swarm network.

Parameters:

• data: Base64 encoded file content or file path
• isPath: (Optional) Whether the data parameter is a file path (default: false)
• redundancyLevel: (Optional) Redundancy level for fault tolerance (0-4, default: 0)

Returns:

• reference: Swarm reference hash for the uploaded file
• url: URL to access the file via Bee API
• message: Status message

Uploads a folder to the Swarm network.

Parameters:

• folderPath: Path to the folder to upload
• redundancyLevel: (Optional) Redundancy level for fault tolerance (0-4, default: 0)

Returns:

• reference: Swarm reference hash for the uploaded folder
• url: URL to access the folder via Bee API
• message: Status message

Downloads folder, files, or binary data from a Swarm reference. This tool should be prioritized over download_text if there is no assumption about the data type.

Parameters:

• reference: Swarm reference hash
• filePath: (Optional) File path to save the downloaded content (only available in stdio mode)

Returns:

• If filePath is not provided: List of files in the manifest
• If filePath is provided: Content saved to specified location

• Node.js 18+ installed
• npm
• A running Bee node or access to a public Bee gateway
• A valid postage batch ID (for production use)

1. Clone this repository
2. Install dependencies:

npm ci

The server configuration is located in src/config.ts:

You can customize:

• Bee API endpoint: Set to any Swarm Bee node or gateway
• Postage Batch ID: Required for uploading data to Swarm (the default ID is a placeholder for testing)

Modify these values as needed for your environment.

You can run the server locally in two different modes: stdio or web.

This is the standard mode for direct integration with MCP clients that manage their own subprocesses.

Development (with hot-reloading):

npm run dev

Development (without building):

npm run serve

Production: First, build the project:

npm run build

Then, run the server:

npm start
# or
npm run start:stdio

This runs the server as a web service on port 3000, with endpoints for both HTTP and SSE.

Development (without building):

npm run serve:web

Production: First, build the project:

npm run build

Then, run the server:

npm run start:web

This project includes a Dockerfile to run the Swarm MCP server as a containerized service, with both HTTP and SSE transports.

• Dockerfile: Builds a single image for the server, which runs on port 3000.

To build the Docker image, run the following command from the project root:

docker build -t swarm-mcp .

To run the server, use the docker run command. The container exposes port 3000 for both HTTP and SSE.

docker run --name swarm-mcp -p 3000:3000 swarm-mcp

To configure the server, pass environment variables to the container using the -e flag. This is necessary to connect to your own Bee node or use features like Swarm Feeds.

docker run -p 3000:3000 \
  -e BEE_API_URL="http://localhost:1633" \
  -e BEE_BATCH_ID="your_batch_id_here" \
  -e BEE_FEED_PK="your_private_key_here" \
  swarm-mcp

You can test if the servers are running correctly by sending a tools/list request using curl.

This command asks the server to list all available tools and expects a single JSON response.

curl -X POST http://localhost:3000/mcp \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-d '{
  "jsonrpc": "2.0",
  "method": "tools/list",
  "id": 1
}'

Note: text/event-stream in the accept header is required for the HTTP server, even to return a JSON response.

A successful response will be a JSON object containing a list of the server's tools.

Interacting with the SSE server is a two-step process. First, you establish a connection to get a sessionId, and then you use that ID to send messages.

Step 1: Open the SSE connection

Run the following command in a terminal. It will connect to the server and wait for events. The server will send back a sessionId which you will need for the next step.

# In Terminal 1
curl -N -H "Accept:text/event-stream" http://localhost:3000/sse

The output will contain the session ID, for example: id: "<your-session-id>"

Step 2: Send a message

In a second terminal, use the sessionId from Step 1 to send a request. Replace <your-session-id> with the actual ID.

# In Terminal 2
curl -X POST -H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"tools/list","params":{},"id":2}' \
"http://localhost:3000/message?sessionId=<your-session-id>"

The response will appear in Terminal 1.

The server supports two connection methods:

When running the server in Docker, it operates as a web service with both HTTP and SSE endpoints. To connect your MCP client, you must use one that supports connecting to a remote server via URL.

• HTTP Server URL: http://localhost:3000/mcp
• SSE Server URL: http://localhost:3000/sse

In your client's settings, add a new remote/custom connector and provide the appropriate URL.

Note on supported features: Functionalities that require direct access to the local file system are not available in web mode. This includes using local paths for uploads (e.g., upload_folder or upload_file with isPath: true) and downloading directly to a file (e.g., download_folder with filePath). These features are only supported when running the server in stdio mode.

For local development or with clients that manage their own server subprocesses, you can run the server directly in stdio mode.

For detailed instructions on how to configure your MCP client for stdio, please refer to the Swarm MCP Client Setup guide.

To run the server in this mode, see the commands under the Stdio (Default) section above.