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MCP Openmsx logo

MCP Openmsx

nataliapc/mcp-openmsx

This server provides comprehensive tools for MSX software development, testing, and automation through standardized MCP protocols.

View on GitHub

Install

npx @nataliapc/mcp-openmsx

Client configuration

{
  "mcpServers": {
    "mcp-openmsx": {
      "command": "npx",
      "args": [
        "@nataliapc/mcp-openmsx"
      ],
      "env": {
        "OPENMSX_SHARE_DIR": "<OPENMSX_SHARE_DIR>"
      }
    }
  }
}

Environment variables

OPENMSX_SHARE_DIROPENMSX_EXECUTABLEOPENMSX_SCREENSHOT_DIROPENMSX_SCREENDUMP_DIROPENMSX_REPLAYS_DIROPENMSX_ENABLE_RAW_TCLOPENMSX_LAUNCH_HEADLESSMCP_HTTP_PORTMCP_ALLOWED_ORIGINS
Author
@nataliapc
Category
Gaming & Gamification, Developer Tools
License
GPL-2.0
Updated
Oct 6, 2026

About MCP Openmsx

"Orchestrating a binary opera where AI conducts, MCP interprets, and openMSX acts as the 8-bit diva."

Tools (20)

  • emu_control

    Controls an openMSX emulator: launch, close, powerOn, powerOff, reset, getEmulatorSpeed, setEmulatorSpeed, machineList, extensionList, wait.

  • emu_replay

    Controls emulation timeline: start, stop, status, goBack, absoluteGoto, advanceFrame, reverseFrame, truncate, saveReplay, loadReplay.

  • emu_info

    Obtain informacion about the current emulated machine: getStatus, getSlotsMap, getIOPortsMap.

  • emu_media

    Manage ROM, disk, and tape media: tapeInsert, tapeRewind, tapeEject, romInsert, romEject, diskInsert, diskInsertFolder, diskEject.

  • emu_vdp

    Manage VDP (Video Display Processor): getPalette, getRegisters, getRegisterValue, setRegisterValue, screenGetMode, screenGetFullText.

  • basic_programming

    BASIC tools: isBasicAvailable, newProgram, runProgram, setProgram, getFullProgram, getFullProgramAdvanced, listProgramLines, deleteProgramLines.

  • debug_run

    Control execution: break, isBreaked, continue, stepIn, stepOut, stepOver, stepBack, runTo.

  • debug_cpu

    Read/write CPU registers, CPU info, Stack pile, and Disassemble code: getCpuRegisters, getRegister, setRegister, getStackPile, disassemble, getActiveCpu.

  • debug_memory

    RAM memory operations: selectedSlots, getBlock, readByte, readWord, writeByte, writeWord, writeBlock, searchBytes.

  • debug_vram

    VRAM operations: getBlock, readByte, writeByte, searchBytes.

  • debug_breakpoints

    Breakpoint management: create, remove, list.

  • debug_log

    Debug log: log, read.

  • debug_conditions

    Condition management (like breakpoints, but not tied to an address — a Tcl expression evaluated continuously while the CPU runs): create, remove, list.

  • emu_keyboard

    Send text or key combinations to emulator: sendText, sendKeyCombo.

  • emu_savestates

    Save and restore machine states: load, save, list.

  • screen_shot

    Capture emulator screen: as_image, to_file.

  • screen_dump

    Export screen data as BASIC BSAVE instruction.

  • msxdocs_resource_get

    Retrieve MCP resources for MCP clients that don't support MCP resources.

  • vector_db_query

    Hybrid search (semantic embeddings + BM25) over the local MSX documentation index, for information about MSX systems, cartridges, programming, and other…

  • openmsx_tcl_cmd

    Executes a native Tcl command in the connected openMSX instance.

Details on this page are taken from the project's README. Open README

Supported clients

Clients mentioned in this server's README:

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