MCP Server

Expose R functions as MCP tools to external clients.

Details

Serves R tools and resources via MCP protocol over stdio.

Public fields

name

Server name

version

Server version

tools

Registered tools

resources

Registered resources

Methods

Public methods

• McpServer$new()

• McpServer$add_tool()

• McpServer$add_resource()

• McpServer$listen()

• McpServer$process_message()

• McpServer$clone()

---

Method new()

Create a new MCP Server

Usage

McpServer$new(name = "r-mcp-server", version = "0.1.0")

Arguments

name

Server name

version

Server version

Returns

A new McpServer object

---

Method add_tool()

Add a tool to the server

Usage

McpServer$add_tool(tool)

Arguments

tool

A Tool object from the SDK

Returns

self (for chaining)

---

Method add_resource()

Add a resource to the server

Usage

McpServer$add_resource(
  uri,
  name,
  description = "",
  mime_type = "text/plain",
  read_fn
)

Arguments

uri

Resource URI

name

Resource name

description

Resource description

mime_type

MIME type

read_fn

Function that returns the resource content

Returns

self (for chaining)

---

Method listen()

Start listening for MCP requests on stdin/stdout This is a blocking call.

Usage

McpServer$listen()

---

Method process_message()

Process a single MCP message (for testing)

Usage

McpServer$process_message(json_str)

Arguments

json_str

The JSON-RPC message

Returns

The response, or NULL for notifications

---

Method clone()

The objects of this class are cloneable with this method.

Usage

McpServer$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.