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MCPBin MCP Server

mcpbin is a lightweight testing service similar to httpbin, designed specifically for MCP (Model Context Protocol) environments.

Installation

Add the following to your MCP client configuration file.

Configuration

View docs

{
  "mcpServers": {
    "bugffet-mcpbin": {
      "url": "https://mcpbin.fastmcp.app/mcp"
    }
  }
}

You can use this MCP server to test MCP client implementations with a hosted endpoint and a local development route. It provides a ready-to-use HTTP endpoint for remote clients and a simple stdio flow for local testing, along with a suite of tools to exercise common MCP capabilities.

How to use

Connect your MCP client to the hosted endpoint to test remote MCP interactions. Use the HTTP URL provided for standard MCP communication, which supports typical MCP client workflows.

For local development and testing, run the built-in development command to start a local MCP server instance that you can connect to from your client. This lets you experiment with prompts, timing controls, and the tool suite in a controlled environment.

How to install

Prerequisites: ensure you have a shell environment with the ability to run build and development commands. You should have a toolchain available to execute the provided commands.

Step 1: Synchronize or install development tooling needed for MCP work. Run the following command in your terminal:

Step 2: Start the local development server to test MCP client interactions locally by running the development command:

HTTP MCP endpoint

Hosted MCP endpoint you can connect to from your client.

Local development flow

Start a local MCP development server to test interactions in isolation.

Available tools

echo

Echo back input data to verify request/response handling.

echo_context

Return information about the request context to help you understand metadata and routing.

status_error

Raise an error with a message and code to test error handling paths.

random_error

Return either a success or an error to simulate intermittent failure.

delay

Pause execution for a specified duration to test timing and timeouts.

generate_uuid

Generate a UUID version 4 string for testing unique identifiers.

timestamp

Return the current timestamp for timing-related tests.

base64_encode

Encode input data to Base64 to verify encoding/transport.

base64_decode

Decode Base64 data back to its original form.

sample_echo

Perform basic sampling on input data to exercise the sampling workflow.

sample_with_system

Sampling that uses a predefined system prompt to shape outputs.

sample_with_params

Sampling with temperature and max_tokens to explore output variation.

sample_multi_turn

Handle multi-turn conversations to test context retention.

elicit_string

Request a string input from the client to simulate user prompts.

elicit_number

Request an integer input from the client to test numeric prompts.

elicit_boolean

Request a boolean choice from the client to validate decision prompts.

elicit_choice

Request a selection from a list of options to test options handling.

elicit_structured

Request structured data to validate complex data collection.