Jo Link MCP Server

A lightweight, headless Java IDE for AI coding agents. It runs locally over stdio via the published package.

People who work with coding agent, java debugger and jdwp and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-09-29 · ★ 2 · #91 OF 180 MAINTAINED DEVELOPER TOOLS · VERIFIED 2026-09-30

MIT · Python servers · how we verify → /methodology

01 · Install Jo Link

before you install - you'll need

Set JOLINK_RUN_MCP_JAVA_E2E, JOLINK_RUN_FAST_TEST_E2E, JOLINK_FAST_TEST_JAVA8_HOME before connecting.

Claude Code

claude mcp add l1ch404-jolink-runtime -- uvx jolink-runtime

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "l1ch404-jolink-runtime": {
      "command": "uvx",
      "args": [
        "jolink-runtime"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license MIT - declared in the repository

pypi package jolink-runtime - check the name against the project README before installing (PyPI has no namespace ownership)

registry namespace io.github.L1ch404 is GitHub-verified and matches the repo owner

03 · Who maintains Jo Link

joLink is maintained by l1ch404. It's the only MCP server we track from this author; the repo dates to Jul 2026.

04 · Facts

repository: github.com/l1ch404/jolink-runtime
website: https://github.com/L1ch404/jolink-runtime
category: developer tools - ranked #91 of 180 actively-maintained developer tools servers as of 2026-09-30.
registry: io.github.L1ch404/jolink-runtime (active, first published 2026-09-23 · 2 versions)
packages: pypi:jolink-runtime

05 · Jo Link FAQ

What is Jo Link?

A lightweight, headless Java IDE for AI coding agents. It runs locally over stdio via the published package.

Is Jo Link still maintained?

Yes - as of 2026-09-30, its last commit was 2026-09-29. We re-verify nightly.

How do I install Jo Link?

Run `uvx jolink-runtime`. The README documents 3 environment variables (JOLINK_RUN_MCP_JAVA_E2E, JOLINK_RUN_FAST_TEST_E2E, JOLINK_FAST_TEST_JAVA8_HOME) to set first. Set JOLINK_RUN_MCP_JAVA_E2E, JOLINK_RUN_FAST_TEST_E2E, JOLINK_FAST_TEST_JAVA8_HOME before connecting. You can also paste the ready-made client config above.

Does Jo Link run locally?

Yes - it's a stdio server: it runs on your machine (via uvx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

06 · Alternatives to Jo Link

Alternatives to Jo Link

Maintained developer tools servers if Jo Link isn't the fit.

Pairs well with

Servers that cover what Jo Link doesn't - only shown when the pairing reason fits the companion.

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