modelcontextprotocol/inspector
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Merge branch 'main' into main

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Cliff Hall 2025-05-21 16:27:13 -04:00 • committed by GitHub
commit efa4959ec4
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2 changed files with 111 additions and 52 deletions
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4
server/package.json
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@ -1,6 +1,6 @@
{
"name": "@modelcontextprotocol/inspector-server",
"version": "0.12.0",
"version": "0.13.0",
"description": "Server-side application for the Model Context Protocol inspector",
"license": "MIT",
"author": "Anthropic, PBC (https://anthropic.com)",
@ -27,7 +27,7 @@
"typescript": "^5.6.2"
},
"dependencies": {
"@modelcontextprotocol/sdk": "^1.11.0",
"@modelcontextprotocol/sdk": "^1.11.5",
"cors": "^2.8.5",
"express": "^5.1.0",
"ws": "^8.18.0",

17
server/src/mcpProxy.ts
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@ -1,4 +1,5 @@
import { Transport } from "@modelcontextprotocol/sdk/shared/transport.js";
import { isJSONRPCRequest } from "@modelcontextprotocol/sdk/types.js";
function onClientError(error: Error) {
console.error("Error from inspector client:", error);
@ -19,7 +20,21 @@ export default function mcpProxy({
let transportToServerClosed = false;
transportToClient.onmessage = (message) => {
transportToServer.send(message).catch(onServerError);
transportToServer.send(message).catch((error) => {
// Send error response back to client if it was a request (has id) and connection is still open
if (isJSONRPCRequest(message) && !transportToClientClosed) {
const errorResponse = {
jsonrpc: "2.0" as const,
id: message.id,
error: {
code: -32001,
message: error.message,
data: error,
},
};
transportToClient.send(errorResponse).catch(onClientError);
}
});
};
transportToServer.onmessage = (message) => {