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MPC Test Server

MCP Server

A minimal MCP test server powered by Bun

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Updated Apr 12, 2025

About

The MPC Test Server is a lightweight, JavaScript-based test implementation that runs on the Bun runtime. It demonstrates basic MCP functionality and serves as a quick reference for developers.

Capabilities

Resources
Access data sources
Tools
Execute functions
Prompts
Pre-built templates
Sampling
AI model interactions

Overview

The Mpc Test server is a lightweight, experiment‑ready implementation of the Model Context Protocol (MCP). Its primary purpose is to demonstrate how an MCP server can be set up quickly and integrated into AI‑assistant workflows, enabling developers to validate protocol interactions before building production‑grade services. By exposing a minimal set of MCP endpoints—resources, tools, prompts, and sampling—the server allows AI assistants such as Claude to query available capabilities, retrieve contextual data, and invoke helper functions without the overhead of a full‑featured backend.

Solving Integration Pain Points

Developers often struggle to bridge the gap between an AI model’s internal reasoning and external data sources or utilities. Traditional approaches require custom API wrappers, manual request handling, and repetitive boilerplate code. Mpc Test removes these friction points by adhering to the MCP specification: it presents a uniform, declarative interface that AI assistants can discover and call at runtime. This eliminates the need for hard‑coded integrations or frequent model retraining, streamlining experimentation and rapid prototyping.

Core Features

  • Resource Discovery: The server lists available data endpoints (e.g., datasets, configuration files) that an assistant can fetch on demand.
  • Tool Exposure: Simple utility functions—such as mathematical operations or string manipulation—are registered as tools, allowing the assistant to invoke them with a structured request.
  • Prompt Templates: Predefined prompt schemas help standardize how the assistant formulates requests to external systems, ensuring consistency across interactions.
  • Sampling Support: The server can return probabilistic outputs or batched results, enabling more natural language generation workflows that depend on stochastic data.

These capabilities are intentionally minimal to keep the codebase approachable, yet they cover all essential MCP primitives needed for real‑world use.

Real‑World Use Cases

  • Rapid Prototyping: Data scientists can spin up Mpc Test to test new prompts or toolchains against a live server before committing to production.
  • Educational Demonstrations: Instructors teaching AI integration can use the server as a sandbox for students to experiment with MCP concepts without complex setup.
  • CI/CD Validation: Automated pipelines can deploy the server to verify that new model updates still honor MCP contracts, catching integration regressions early.
  • Cross‑Platform Tooling: Because the server is written in Bun, it can run on any platform that supports JavaScript runtimes, making it suitable for mobile or edge deployments.

Integration with AI Workflows

An AI assistant interacts with Mpc Test by querying the endpoint to discover data sources, then invoking tools via when a task requires external computation. Prompt templates are retrieved through and used to construct structured calls, ensuring that the assistant’s messages conform to expected schemas. Finally, sampling endpoints provide stochastic results that can be fed back into the model’s next turn, enabling iterative refinement.

Unique Advantages

  • Simplicity & Speed: Built with Bun, the server starts in milliseconds and requires only a single dependency installation step.
  • Protocol Fidelity: It implements the MCP specification verbatim, guaranteeing that any MCP‑compliant assistant will interact with it without custom adapters.
  • Extensibility: Developers can easily add new tools or resources by extending the existing TypeScript files, making it a flexible playground for experimenting with advanced MCP features.

In summary, Mpc Test serves as an approachable, standards‑compliant gateway for developers to explore and validate MCP integrations. Its lightweight nature, combined with a full set of core protocol features, makes it an invaluable asset for anyone looking to connect AI assistants to external systems efficiently and reliably.