Xk6 MCP Server

@dgzlopes

Repository

Basic information

About Xk6 MCP Server

Test MCP servers with k6

#xk6

Xk6 MCP Server config

No standard config provided

This server doesn't expose a parseable MCP config block in its README. See the repository for install instructions.

Repository

Xk6 MCP Server tools

Tool list not available yet

This listing does not currently have a tool list to display. This does not mean the server has no tools; check its documentation for supported capabilities.

We auto-extract tools from the README. The maintainer can list them under a ## Tools heading to populate this section.

Overview

What is xk6-mcp?

xk6-mcp is a k6 extension for testing Model Context Protocol (MCP) servers. It lets developers load-test MCP servers using k6, providing client support for stdio, SSE, and Streamable HTTP transports, built-in pagination, and automatic RED-style metrics.

How to use xk6-mcp?

Install xk6, then build a k6 binary with the extension: xk6 build --with github.com/dgzlopes/xk6-mcp. Import the module in your script with import mcp from 'k6/x/mcp'; and run the built binary: ./k6 run script.js.

Key features of xk6-mcp

Supports stdio, SSE, and Streamable HTTP transports
Automatic pagination via *All methods (e.g., listAllTools())
Manual pagination for fine-grained control
Built-in RED metrics (request duration, count, errors)
Tagged metrics per MCP method (e.g., GetPrompt, ListTools)
Enables connection, tool, resource, and prompt operations

Use cases of xk6-mcp

Load testing MCP server responsiveness and reliability
Validating tool, resource, and prompt availability under load
Monitoring MCP server error rates and latency in k6 tests

Frequently asked questions

What about non-stdio transports?

Both SSE and Streamable HTTP are supported — use `mcp.SSEClient` or `mcp.StreamableHTTPClient` respectively.

What about pagination?

The extension offers two ways: `listAllTools()` (and similar) automatically handle pagination, while `listTools()` requires a cursor argument for manual pagination.

What about metrics?

xk6-mcp automatically tracks RED-style metrics: `mcp_request_duration` (trend), `mcp_request_count` (counter), and `mcp_request_errors` (counter), each tagged with the MCP method name.