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* Remove handling of out-of-spec 'notification/stderr' messages. It's not a thing. See https://github.com/modelcontextprotocol/servers/pull/2469

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* Inspect the stderr output of STDIO servers and attempt to assign an appropriate RFC 5424 Syslog Protocol level before sending a leveled logging message to the client
This commit is contained in:
cliffhall 2025-08-21 18:01:29 -04:00
commit 9dbd5cc85b
1 changed files with 49 additions and 77 deletions
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51
server/src/index.ts
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@ -401,24 +401,65 @@ app.get(
(serverTransport as StdioClientTransport).stderr!.on("data", (chunk) => {
if (chunk.toString().includes("MODULE_NOT_FOUND")) {
// Server command not found, remove transports
const message = "Command not found, transports removed";
webAppTransport.send({
jsonrpc: "2.0",
method: "notifications/stderr",
method: "notifications/message",
params: {
content: "Command not found, transports removed",
level: "alert",
data: {
error: message,
},
},
});
webAppTransport.close();
serverTransport.close();
webAppTransports.delete(webAppTransport.sessionId);
serverTransports.delete(webAppTransport.sessionId);
console.error("Command not found, transports removed");
console.error(message);
} else {
// Inspect message and attempt to assign a RFC 5424 Syslog Protocol level
let level;
let message = chunk.toString();
let ucMsg = chunk.toString().toUpperCase();
if (ucMsg.includes("DEBUG")) {
level = "debug";
} else if (ucMsg.includes("INFO")) {
level = "info";
} else if (ucMsg.includes("NOTICE")) {
level = "notice";
} else if (ucMsg.includes("WARN")) {
level = "warning";
} else if (ucMsg.includes("ERROR")) {
level = "error";
} else if (ucMsg.includes("CRITICAL")) {
level = "critical";
} else if (ucMsg.includes("ALERT")) {
level = "alert";
} else if (ucMsg.includes("EMERGENCY")) {
level = "emergency";
} else if (ucMsg.includes("SIGINT")) {
level = "alert";
message = "SIGINT received. Server shutdown.";
} else if (ucMsg.includes("SIGHUP")) {
level = "alert";
message = "SIGHUP received. Server shutdown.";
} else if (ucMsg.includes("SIGTERM")) {
level = "alert";
message = "SIGTERM received. Server shutdown.";
} else {
level = "info";
}
webAppTransport.send({
jsonrpc: "2.0",
method: "notifications/stderr",
method: "notifications/message",
params: {
content: chunk.toString(),
level,
logger: "stdio",
data: {
error: message,
},
},
});
}