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Releases: Blazemeter/jmeter-mcp-plugin

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v1.0.0

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@diego-ferrand diego-ferrand released this 19 Oct 17:37
v1.0.0
a0eba12

BlazeMeter MCP Plugin 1.0.0 is the first release. It adds an MCP client to Apache JMeter so the same test plan can check, automate, or load-test a Model Context Protocol server.

Components

  • bzm - MCP Client Config shares one MCP client across the test. Transports are STDIO, SSE, and Streamable HTTP.
  • bzm - MCP Server Process starts an HTTP or SSE MCP server from the test plan, for example @modelcontextprotocol/server-everything.
  • bzm - MCP Sampler calls that client and records each call as a sample.

Sampler operations

PING, LIST_TOOLS, CALL_TOOL, LIST_RESOURCES, READ_RESOURCE, LIST_PROMPTS, and GET_PROMPT.

CALL_TOOL can load the tool argument schema in the GUI. A tool result with isError=true fails the sample.

Also in this release

  • HTTP headers come from an HTTP Header Manager on the client config, including Authorization for a hosted MCP server.
  • Connect and initialize can run when the test starts, or on the first sampler. Elapsed time is the MCP call only. Time spent waiting for the client is Connect Time.
  • Sample results show request headers, MCP session metadata in response headers, and pretty-printed JSON in the body.
  • The managed server process stops when the test ends. HTTP clients are closed first so the SSE stream shuts down cleanly.
  • STDIO commands resolve on Windows through PATHEXT.
  • An MCP v2 server (2026-07-28) fails the sample with a clear “not supported” message.
  • Example plans for STDIO, SSE and Streamable HTTP are in examples/.

Requirements

Java 17 or 21 with JMeter through 5.6.3. The shaded JAR bundles the MCP SDK, so Plugins Manager or a copy into JMETER_HOME/lib/ext is enough.

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