What is the key difference between MCP Server and MCP Js?

MCP Server belongs to the Code Execution category with local stdio execution, while MCP Js belongs to the Code Execution category with cloud HTTP/SSE execution.

How do I install MCP Server or MCP Js in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are MCP Server and MCP Js free or paid?

MCP Server operates under a Free / Open Source model (No auth required). MCP Js operates under a Free / Open Source model (API Key required).

Which MCP server has more tools and community activity?

MCP Server lists 6 tools with 2 views and 5 GitHub stars. MCP Js lists 5 tools with 2 views and 57 GitHub stars.

Can I use both MCP Server and MCP Js together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

MCP Server vs MCP Js

In-depth architectural comparison of the MCP Server and MCP Js MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

MCP Server

Code Execution · Local stdio

Quality: 48/100 (Fair) | Auth: No auth required

MCP Js

Code Execution · Remote HTTP/SSE

Quality: 59/100 (Good) | Auth: API Key required

Verdict Summary: Choose MCP Server if you need specialized Code Execution tools running via a local process. Choose MCP Js if your workspace requires Code Execution integration with remote web transport. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose MCP Server when:

You need dedicated capabilities in the Code Execution domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
Primary tools included: Unified capability manifest enforcing allowed hosts, CPU, and memory limits, Multiple sandbox kernels: Node.js VM, WASM (QuickJS, Pyodide, Wasmtime), remote microVMs, Runtime firewall for vetting and policy enforcement of tool calls.

Explore MCP Server Details

Choose MCP Js when:

You need dedicated capabilities in the Code Execution domain.
You prefer remote streaming HTTP/SSE transport architecture.
Your security boundary fits: API Key required (Free / Open Source).
You have access to required keys: MCP_V8_CONFIG.

Feature & Specification Comparison

Specification	MCP Server telleroutlook/agentkit-js Code Execution	MCP Js r33drichards Code Execution
Summary	Code-mode MCP server: collapses N user-defined tools into a two-tool surface (executecode + docssearch). Backed by a unified capability manifest (allowedHosts / cpuMs / memoryLimitBytes) honoured across three sandbox kernels — in-process node:vm, WASM (QuickJS / Pyodide / Wasmtime), and remote microVM (E2B / Cloudflare Sandbox). Token-saving benchmark in repo CI.	A Javascript code execution sandbox that uses v8 to isolate code to run AI generated javascript locally without fear. Supports heap snapshotting for persistent sessions.
Category & Scope

Tools & Capabilities Breakdown

MCP Server Tools (6)

Unified capability manifest enforcing allowed hosts, CPU, and memory limits

Multiple sandbox kernels: Node.js VM, WASM (QuickJS, Pyodide, Wasmtime), remote microVMs

Runtime firewall for vetting and policy enforcement of tool calls

Signed evidence export (AEP) for auditing and compliance

Reducer-backed shared state syncing between agent and UI

Support for taint tracking and provenance of tool results

MCP Js Tools (5)

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

MCP Server Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "telleroutlook-agentkit-js-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "telleroutlook-agentkit-js-mcp-server"
      ]
    }
  }
}

MCP Js Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "r33drichards-mcp-js": {
      "url": "http://localhost:8080/mcp"
    }
  }
}

Frequently Asked Questions

MCP Server is categorized under Code Execution and uses a local stdio subprocess. In contrast, MCP Js belongs to Code Execution using remote streaming HTTP/SSE transport. Select MCP Server when you need capabilities focused on code execution and MCP Js when you require tools for code execution.

More alternatives to MCP Server More alternatives to MCP Js Code Execution category hub Canonical compare URL