A production-oriented Model Context Protocol (MCP) server for Express.js applications that enables AI clients to inspect backend systems through structured engineering tools instead of direct file system access.

The server exposes backend engineering context including Git history, Winston logs, OpenAPI/Swagger contracts, and sandboxed source code through MCP tools. The implementation has been validated using both the official MCP Inspector and Claude Desktop.

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Features

• MCP-compliant server using the official MCP SDK
• Tool Registry based architecture
• Git history provider
• Winston log provider
• Dynamic Swagger/OpenAPI provider
• Sandboxed source code provider
• Compatible with Claude Desktop
• Validated using the official MCP Inspector
• Extensible provider architecture
• Read-only engineering context

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Architecture

flowchart TD

Client[Claude Desktop / MCP Inspector]

Transport[STDIO Transport]

Server[MCP Server]

Registry[Tool Registry]

Git[Git Provider]

Swagger[Swagger Provider]

Logs[Winston Provider]

Source[Source Code Provider]

Express[(Express Application)]

Client <--> Transport
Transport <--> Server
Server --> Registry
Registry --> Git
Registry --> Swagger
Registry --> Logs
Registry --> Source

Git --> Express
Swagger --> Express
Logs --> Express
Source --> Express

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Provider Responsibilities

Provider	Responsibility
Git Provider	Reads Git commit history for project files
Swagger Provider	Reads dynamically generated OpenAPI contracts
Log Provider	Retrieves Winston application logs
Source Provider	Lists directories and securely reads project source code
Tool Registry	Registers and dispatches MCP tool requests

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Tech Stack

Category	Technology
Runtime	Node.js
Framework	Express.js
Protocol	Model Context Protocol
Logging	Winston
API Documentation	Swagger JSDoc
Database	MySQL + Sequelize
Version Control	Git
AI Client	Claude Desktop
Testing	MCP Inspector

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Installation

git clone <repository>

npm install

npm run dev

Configure Claude Desktop:

{
  "mcpServers": {
    "engineering-intelligence": {
      "command": "node",
      "args": [
        "/absolute/path/mcp/server.js"
      ]
    }
  }
}

Restart Claude Desktop.

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Available MCP Tools

Tool	Description
check_file_history	Returns recent Git history for a file
read_winston_logs	Reads recent Winston logs
analyze_api_contract	Reads OpenAPI contract for an endpoint
list_directory	Lists project directories
read_source_code	Reads project source files securely

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Working Example

Prompt

Compare the implementation of POST /orders with its OpenAPI contract.

Tool Execution

Phase	Tool
API Contract Inspection	analyze_api_contract
Source Inspection	read_source_code
Analysis	Claude Desktop

Result

The server successfully detected a contract mismatch between the documented API and the controller implementation.

Example:

• Swagger contract expects customerId
• Controller consumes userId

This demonstrates how multiple MCP tools can be orchestrated by an AI client to investigate backend implementation issues.

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Testing

The implementation was validated using two independent MCP clients.

MCP Inspector

• Tool discovery
• Tool execution
• Protocol validation
• Response verification

Claude Desktop

Successfully connected without code changes.

Validated:

• Git history inspection
• Winston log retrieval
• Swagger analysis
• Source code inspection

This confirms interoperability with real MCP clients.

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Project Structure

project/
├── app.js
├── index.js
├── logger.js
├── swaggerConfig.js
├── controllers/
├── models/
├── routes/
├── validations/
├── config/
├── mcp/
│   ├── server.js
│   ├── registry/
│   │    └── toolRegistry.js
│   └── providers/
│        ├── gitProvider.js
│        ├── logProvider.js
│        ├── swaggerProvider.js
│        └── sourceCodeProvider.js
└── package.json

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Roadmap

• AST-based source code analysis
• Sequelize schema provider
• Express route dependency graph
• Architecture summarization
• Middleware analysis
• Configuration provider
• Project dependency analysis

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License

Licensed under the ISC License.