J-Link MCP Server

by klievanio.github.Klievan/jlink-mcpv0.6.0

MCP server for SEGGER J-Link debug probes — LLM-driven embedded debugging with RTT, GDB server, and Trice/Pigweed support

34Node.jsstdioofficial registry

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security

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cold start

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freshness

Active25d ago

Install J-Link MCP server

claude mcp add jlink -e JLINK_DEVICE='<jlink-device>' -- npx -y jlink-mcp

{
  "mcpServers": {
    "jlink": {
      "command": "npx",
      "args": [
        "-y",
        "jlink-mcp"
      ],
      "env": {
        "JLINK_DEVICE": "<jlink-device>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "jlink": {
      "command": "npx",
      "args": [
        "-y",
        "jlink-mcp"
      ],
      "env": {
        "JLINK_DEVICE": "<jlink-device>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "jlink": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "jlink-mcp"
      ],
      "env": {
        "JLINK_DEVICE": "<jlink-device>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "jlink": {
      "command": "npx",
      "args": [
        "-y",
        "jlink-mcp"
      ],
      "env": {
        "JLINK_DEVICE": "<jlink-device>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
JLINK_DEVICE	yes	—	Target device name, exactly as J-Link spells it (e.g. nRF52840_XXAA, STM32F407VG). Use the search_devices tool to find it.
JLINK_SERIAL	—	—	Serial number of a specific probe, when more than one is attached.
SVD_PATH	—	—	CMSIS-SVD file for the target. Without it, peripheral reads are undecoded hex.
JLINK_RTT_ADDR	—	—	Address of the firmware's _SEGGER_RTT symbol. Lets RTT survive a reset or flash.

Freshness

Active — last maintenance signal 25d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-09-15 · 25d ago · GitHub
Latest release
2026-08-28 · 43d ago · GitHub · v0.7.0
Package published
no data · npm/PyPI
Registry entry updated
2026-08-28 · 43d ago · official registry · v0.6.0

FAQ

›How do I install the J-Link MCP server in Claude Code?

Run: claude mcp add jlink -e JLINK_DEVICE='<jlink-device>' -- npx -y jlink-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does J-Link require an API key?

Yes. It expects JLINK_DEVICE.

›Can I use J-Link as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is J-Link in the official MCP registry?

Yes, as io.github.Klievan/jlink-mcp.