OpenSysML MCP server runs on your own machine — the client starts it, so there is no endpoint to ping. 401 installs a week from npm. Last commit 2 Nov 2026.
SysML v2 and KerML for coding agents: workspace diagnostics and edits, execution, REPL sessions.
What the code does
We read the source, 23 h ago · rules 995398eba69f
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
const child = spawn(binary, args, { stdio: "inherit", windowsHide: true });
Found in continuous integration, deployment or infrastructure files, or in a neighbouring package of the same monorepo. None of this is installed when you add the server: it describes how the project is built and released. We list it because a leaked key in a build pipeline is still a real problem, but it is not something this server does on your machine.
fileDesc("CgtzeXNtbC5wcm90bxIFc3lzbWwiqQMKB1ZlcmRpY3QSDAoEa2luZBgBIAEoCRISCgplbGVtZW50X2lkGAIgASgJEg8KB2VsZW1lbnQYAyABKAkSDQoFaG9sZHMYBCABKAgSEQoJY29uZGl0aW9uGAUgASgJEhMKC2luc3RhbmNlX2lkGAYgASgDEhgKEGluc3RhbmNlX3R5cGVfaWQYByABKAkSDQoFZXJyb3IYCCABKAkSLAoOZmFpbHVyZV9yZWFzb24YCSAB…
Object name = stream.readObject();
process = subprocess.Popen(command)
path = os.path.join(staging_dir, name)
this.model(call).eval(String(call.request["expression"]), {
step.kind = stepDelete
default:
return nil, "is a " + sort + " message, which has no v2 form"
new ProcessBuilder(
def eval(self, expression, context_symbol_id=None, subject=None):
fileDesc("CgtzeXNtbC5wcm90bxIFc3lzbWwiqQMKB1ZlcmRpY3QSDAoEa2luZBgBIAEoCRISCgplbGVtZW50X2lkGAIgASgJEg8KB2VsZW1lbnQYAyABKAkSDQoFaG9sZHMYBCABKAgSEQoJY29uZGl0aW9uGAUgASgJEhMKC2luc3RhbmNlX2lkGAYgASgDEhgKEGluc3RhbmNlX3R5cGVfaWQYByABKAkSDQoFZXJyb3IYCCABKAkSLAoOZmFpbHVyZV9yZWFzb24YCSAB…
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
This code can reach further than it looks
We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add sysml-mcp -- npx -y @openmbee/sysml-mcp{
"mcpServers": {
"sysml-mcp": {
"command": "npx",
"args": [
"-y",
"@openmbee/sysml-mcp"
]
}
}
}[mcp_servers.sysml-mcp]
command = "npx"
args = ["-y", "@openmbee/sysml-mcp"]{
"mcpServers": {
"sysml-mcp": {
"command": "npx",
"args": [
"-y",
"@openmbee/sysml-mcp"
]
}
}
}{
"servers": {
"sysml-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@openmbee/sysml-mcp"
]
}
}
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OpenSysML MCP server — questions
Answers built from our own checks of this server.