Tester Client for Model Context Protocol (MCP)

Implementation of a model context protocol (MCP) client that connects to an MCP server using HTTP streamable (recommended) transport and displays the conversation in a chat-like UI. It is a standalone Actor server designed for testing MCP servers over HTTP streamable. It uses Pay-per-event pricing model.

For more information, see the Model Context Protocol website or blogpost What is MCP and why does it matter?.

Once you run the Actor, check the output or logs for a link to the chat UI interface to interact with the MCP server. The URL will look like this and will vary each run:

Navigate to https://...apify.net to interact with chat-ui interface.

🚀 Main features

• 🔌 Connects to an MCP server using HTTP streamable
• 💬 Provides a chat-like UI for displaying tool calls and results
• 🇦 Connects to an Apify MCP Server for interacting with one or more Apify Actors
• 💥 Dynamically uses tools based on context and user queries (if supported by a server)
• 🔓 Use Authorization headers and API keys for secure connections
• 🪟 Open source, so you can review it, suggest improvements, or modify it

🎯 What does Tester MCP Client do?

When connected to Apify MCP Server the Tester MCP Client provides an interactive chat interface where you can:

• "What are the most popular Actors for social media scraping?"
• "Show me the best way to use the Instagram Scraper"
• "Which Actor should I use to extract data from LinkedIn?"
• "Can you help me understand how to scrape Google search results?"

📖 How does it work?

The Apify MCP Client connects to a running MCP server over HTTP streamable and it does the following:

• Initiates a streamable HTTP connection to the MCP server.
• Sends user queries to the MCP server.
• Receives real-time streamed responses that may include LLM output, and tool usage blocks
• Based on the LLM response, orchestrates tool calls and displays the conversation
• Displays the conversation

⚙️ Usage

• Test any remote MCP server
• Test Apify MCP Server and the ability to dynamically select amongst thousands of tools

Learn about the key features and capabilities in the Apify MCP Server Tutorial: Integrate 5,000+ Apify Actors and Agents Into Claude video

Apify MCP Server Tutorial: Integrate 5,000+ Apify Actors and Agents Into Claude

Normal Mode (on Apify)

You can run the Tester MCP Client on Apify and connect it to any MCP server that supports HTTP streamable. Configuration can be done via the Apify UI or API by specifying parameters such as the MCP server URL, system prompt, and API key.

Once you run Actor, check the logs for a link to the Tester MCP Client UI, where you can interact with the MCP server: The URL will look like this and will be different from run to run:

INFO  Navigate to https://......runs.apify.net in your browser to interact with an MCP server.

💰 Pricing

The Apify MCP client uses a modern and flexible approach for AI Agents monetization and pricing called Pay-per-event. You only need to have Apify account and you can use it, LLM provider API key is not required but you can supply it if you want to use your own LLM provider.

Supported models

Current models:

• Claude Sonnet 4.5 (claude-sonnet-4-5-20250929) - Default for Sonnet
• Claude Haiku 4.5 (claude-haiku-4-5-20251001)

... View full README on GitHub