Tester Client for Model Context Protocol (MCP)

What is Tester Client for Model Context Protocol (MCP)?

A standalone Apify Actor server that connects to an MCP server over Server-Sent Events (SSE) or Streamable HTTP and displays the conversation in a chat-like UI. It is designed for testing MCP servers and is open source.

How to use Tester Client for Model Context Protocol (MCP)?

Run the Actor on Apify or locally. On Apify, configure the MCP server URL, system prompt, and API key via the UI or API. After launch, check the logs for a link to the chat UI. For local development, clone the repository, install dependencies, create a .env file with your tokens, and run npm start.

Key features of Tester Client for Model Context Protocol (MCP)

• Connects to MCP servers using SSE or Streamable HTTP
• Provides a chat-like UI for tool calls and results
• Connects to the Apify MCP Server for interacting with Apify Actors
• Dynamically uses tools based on context and user queries
• Supports Authorization headers and API keys for secure connections
• Open source for review, improvement, and modification

Use cases of Tester Client for Model Context Protocol (MCP)

• Test any MCP server that supports SSE or Streamable HTTP
• Experiment with the Apify MCP Server and its thousands of available tools
• Ask natural language questions about Apify Actors, such as “Show me the best way to use the Instagram Scraper”

FAQ from Tester Client for Model Context Protocol (MCP)

What does Tester Client for Model Context Protocol (MCP) do compared to other MCP clients?

It is specifically built for testing MCP servers over SSE/Streamable HTTP, featuring a lightweight chat UI and dynamic tool orchestration. It does not support all MCP features such as Prompts and Resources.

What platforms or models does it support?

It runs on the Apify platform or locally as a Node.js server. It connects to any MCP server that communicates via SSE or Streamable HTTP, and uses an LLM provider (user-provided API key or Apify’s default) for processing queries.

Does it support any MCP server?

It works with any MCP server that supports SSE or Streamable HTTP. It has a built‑in connection to the Apify MCP Server for testing Apify Actors.

What is the pricing and licensing?

The Actor is free to use; you pay only for LLM provider usage and Apify platform resources under a Pay-per-event model. It is open source.

What are its known limitations?

The client does not support MCP Prompts or Resources. It focuses on tool‑calling and chat interactions over SSE/Streamable HTTP.