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Copilot Instructions for Pluraal

This project is a TypeScript-based Model Context Protocol (MCP) server implementation. Here are the key development guidelines:

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Jan 15, 2026

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Copilot Instructions for Pluraal

This project is a TypeScript-based Model Context Protocol (MCP) server implementation. Here are the key development guidelines:

Project Overview

Language: TypeScript with Node.js
Framework: Model Context Protocol SDK
Purpose: Lean MCP server with comprehensive development tooling

Development Guidelines

Code Style

Use TypeScript strict mode
Prefer explicit types over
```
any
```
Use ES modules (import/export)
Follow Prettier formatting rules
Use single quotes for strings
Include trailing commas in multi-line structures

MCP Server Development

All tools should be defined using the
```
server.tool()
```
method
Use Zod schemas for parameter validation
Always return content in the MCP standard format
Log to stderr, never stdout (breaks MCP communication)
Handle errors gracefully with appropriate error messages

Testing

Write unit tests for all tools and utilities
Use Vitest for testing framework
Aim for high test coverage
Test both success and error cases

File Organization

Keep MCP server logic in
```
src/index.ts
```
Separate complex tools into their own modules
Use descriptive file and function names
Group related functionality together

MCP SDK Reference

For more information about implementing MCP servers:

SDK Documentation: https://github.com/modelcontextprotocol/typescript-sdk
Server Examples: https://github.com/modelcontextprotocol/create-python-server

Key Commands

```
npm run dev
```
- Development with hot reload
```
npm run build
```
- Compile TypeScript
```
npm test
```
- Run tests
```
npm run lint
```
- Check code style
```
npm run format
```
- Format code

Important Notes

Never use
```
console.log()
```
in MCP servers (use
```
console.error()
```
for debugging)
Always validate inputs with Zod schemas
Return results in the standard MCP content format
Handle async operations properly with try/catch blocks
Always use
```
npm run build:all
```
to verify correctness after changes