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Analyzing MCP roots integration for everything server

I've analyzed the MCP roots specification and existing implementation. Here are my suggestions for integrating roots into the everything server:

Analysis and Recommendations

Why Add Roots to Everything Server?

As @headinthebox mentioned, having the everything server demonstrate every MCP feature makes it a comprehensive testing tool for MCP client builders. While the everything server doesn't perform file operations, roots integration would:

Complete feature coverage - Demonstrate all MCP capabilities in one server
Test client roots implementation - Provide a simple way to test roots protocol
Show best practices - Demonstrate proper roots handling patterns

Suggested Implementation Approach

1. Add Roots Capability Declaration

The everything server should declare roots support in its capabilities:

// In everything.ts line 156
{
  capabilities: {
    prompts: {},
    resources: { subscribe: true },
    tools: {},
    logging: {},
    completions: {},
    elicitation: {},
    roots: {}, // Add this line
  },
  instructions
}

2. Add Root Directory Tracking

Add state tracking for allowed directories:

// Add after line 168 in everything.ts
let allowedDirectories: string[] = [];

3. Add Roots Protocol Handlers

Implement the two key handlers for roots protocol:

// Handler for dynamic roots updates (notifications/roots/list_changed)
server.setNotificationHandler(RootsListChangedNotificationSchema, async () => {
  try {
    const response = await server.listRoots();
    if (response && 'roots' in response) {
      allowedDirectories = response.roots.map(root => 
        root.uri.startsWith('file://') ? root.uri.slice(7) : root.uri
      );
      console.error(`Updated allowed directories from MCP roots: ${allowedDirectories.length} directories`);
    }
  } catch (error) {
    console.error("Failed to request roots from client:", error);
  }
});

// Initialize roots on startup
server.oninitialized = async () => {
  const clientCapabilities = server.getClientCapabilities();
  
  if (clientCapabilities?.roots) {
    try {
      const response = await server.listRoots();
      if (response && 'roots' in response) {
        allowedDirectories = response.roots.map(root => 
          root.uri.startsWith('file://') ? root.uri.slice(7) : root.uri
        );
        console.error(`Initial roots: ${allowedDirectories.length} directories`);
      }
    } catch (error) {
      console.error("Failed to get initial roots:", error);
    }
  } else {
    console.error("Client does not support roots protocol");
  }
};

4. Add Roots Demonstration Tools

Add tools to demonstrate roots functionality:

// Add new tool schemas
const ListRootsSchema = z.object({});

const CheckPathAccessSchema = z.object({
  path: z.string().describe("Path to check access for")
});

// Add to ToolName enum
enum ToolName {
  // ... existing tools
  LIST_ROOTS = "listRoots",
  CHECK_PATH_ACCESS = "checkPathAccess"
}

// Add to tools list in ListToolsRequestSchema handler
{
  name: ToolName.LIST_ROOTS,
  description: "Lists the current root directories provided by the MCP client",
  inputSchema: zodToJsonSchema(ListRootsSchema) as ToolInput,
},
{
  name: ToolName.CHECK_PATH_ACCESS,  
  description: "Checks if a given path would be accessible within current roots",
  inputSchema: zodToJsonSchema(CheckPathAccessSchema) as ToolInput,
}

// Add tool implementations in CallToolRequestSchema handler
if (name === ToolName.LIST_ROOTS) {
  ListRootsSchema.parse(args);
  return {
    content: [
      {
        type: "text", 
        text: `Current allowed root directories:\n${allowedDirectories.map((dir, i) => `${i + 1}. ${dir}`).join('\n') || 'No roots configured'}`
      }
    ],
  };
}

if (name === ToolName.CHECK_PATH_ACCESS) {
  const { path } = CheckPathAccessSchema.parse(args);
  const hasAccess = allowedDirectories.some(root => 
    path.startsWith(root) || path === root
  );
  return {
    content: [
      {
        type: "text",
        text: hasAccess 
          ? `✅ Path "${path}" is accessible (within allowed roots)`
          : `❌ Path "${path}" is NOT accessible (outside allowed roots)`
      }
    ],
  };
}

5. Update Documentation

Update the README.md to document the new roots capability and tools.

Benefits of This Approach

Non-intrusive - Doesn't change existing functionality
Educational - Shows exactly how roots protocol works
Testable - Provides concrete tools to verify roots behavior
Complete - Demonstrates both initialization and runtime updates
Safe - No actual file operations, just demonstrates the protocol

Required Imports

Add to imports at top of everything.ts:

import {
  RootsListChangedNotificationSchema,
  type Root,
} from "@modelcontextprotocol/sdk/types.js";

This implementation would give the everything server complete MCP feature coverage while providing a practical way for client developers to test their roots protocol implementation.

Read repository setup instructions (CLAUDE.md)
Examine the everything server implementation
Review filesystem server's roots implementation
Analyze MCP roots specification
Suggest integration approach for everything server

Everything server does not support every thing #2552

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