MCP Aggregation Nexus

A central server designed to interface with and govern several underlying MCP (Model Context Protocol) instances.

Abstract

This implementation establishes a core nexus for linking disparate MCP servers, cataloging their accessible functionalities, and routing invocations through a unified command structure. Its primary utility lies in transcending the standard 40-tool limitation imposed by certain environments like Cursor. Furthermore, it enhances reliability by simplifying the exposed API surface, thereby diminishing inadvertent invocation of inappropriate utilities.

Core Capabilities

• Automated bootstrapping of connections to remote MCP services based on configuration directives.
• Dynamic introspection of the tool inventories resident on all linked hosts.
• Remote tool execution routing with seamless result relay back to the caller.

Setup Directives

Integrate the following definition within your primary mcp.json manifest:

Via npx Execution

{ "mcpServers": { "mcp-nexus": { "command": "npx", "args": [ "-y", "mcp-hub-mcp", "--config-path", "/path/to/your/nexus-operational-settings.json" ] } } }

Via Direct Node Invocation

When iterative refinement necessitates direct execution or when npx environment caching causes issues:

{ "mcpServers": { "mcp-nexus": { "command": "node", "args": [ "/path/to/your/mcp-hub-mcp/dist/index.js", "--config-path", "/path/to/your/nexus-operational-settings.json" ] } } }

Prerequisite: Ensure the distribution artifact is up-to-date (e.g., run npm run build or equivalent) so that dist/index.js is present.

System Protocol Mandate (AI Context Rules)

Prior to fulfilling any user directive, the designated command list_all_tools MUST be invoked to ascertain the current functional landscape.

This guarantees that the assisting agent maintains an accurate, real-time map of executable capabilities.

Deployment and Operation

Prerequisites

• Runtime Environment: Node.js version 18.0.0 or newer.
• Package Manager: npm, yarn, or pnpm.

Acquisition

bash

Obtain the source code repository

git clone cd mcp-hub-mcp

Install requisite dependencies

npm install

OR

yarn install

OR

pnpm install

Compilation

bash npm run build

OR

yarn build

OR

pnpm build

Activation

bash npm start

OR

yarn start

OR

pnpm start

Iterative Development Mode

bash npm run dev

OR

yarn dev

OR

pnpm dev

Configuration Schema

The nexus employs a configuration structure analogous to the Claude Desktop model to bootstrap connections to subordinate MCP services. The specific path to this configuration file is determined via three fallback mechanisms:

1. Environment Variable: Setting the MCP_CONFIG_PATH variable to the desired file location.
2. Argument Override: Utilizing the --config-path command-line flag.
3. Default Location: Searching for a file named mcp-config.json in the execution directory.

Expected Configuration File Structure:

{ "mcpServers": { "serverAlias1": { "command": "launch_directive", "args": ["param1", "param2", ...], "env": { "ENV_VAR_ID": "value_set", ... } // Optional environment variables }, "serverAlias2": { "command": "alternative_directive", "args": ["paramA", "paramB", ...] } } }

Illustrative Example:

{ "mcpServers": { "system_fs_access": { "command": "npx", "args": [ "-y", "@modelcontextprotocol/server-filesystem", "/Users/username/DocumentsRoot", "/Users/username/SharedData" ] }, "external_api_handler": { "command": "node", "args": ["/srv/scripts/external-mcp-interface.js"] } } }

Exposed Toolset

The MCP-Nexus service exposes the following interface commands:

1. list-all-tools

Retrieves a consolidated inventory of all functions available across all affiliated servers.

{ "name": "list-all-tools", "arguments": {} }

2. call-tool

Dispatches an execution request to a specific underlying service endpoint.

• serverName: Identifier for the target MCP instance.
• toolName: The function to be invoked.
• toolArgs: The parameters required by the target function.

{ "name": "call-tool", "arguments": { "serverName": "system_fs_access", "toolName": "read_file_contents", "toolArgs": { "file_path": "/Users/username/project_notes.md" } } }

Commit Protocol Standard

Adherence to Conventional Commits standard is enforced for automated version tracking and changelog generation.

Schema: <classification>(<area>): <summary_of_change>

Examples:

• feature: integrate secure connection handshake
• bugfix: rectify race condition during concurrent tool calls
• docs: overhaul configuration parameter definitions
• chore: update dependency lock files

Critical Revisions: Append BREAKING CHANGE: in the footer section to mandate a MAJOR version increment.

Classifications:

• feature: New functionality (MINOR increment).
• bugfix: Error resolution (PATCH increment).
• docs: Documentation modifications only.
• style: Formatting/cosmetic code adjustments.
• refactor: Structural code improvements without functional change.
• perf: Performance optimization modifications.
• test: Addition or correction of testing artifacts.
• chore: Build system maintenance or auxiliary utility updates.

Technology Foundation

• Core Language Runtime: Node.js
• Source Language: TypeScript
• Primary SDK: @modelcontextprotocol/sdk (v: ^1.9.0)
• Validation Utility: zod (v: ^3.22.4)

Licensing

Open Source - MIT

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