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Fix: Handle error responses in Streamable HTTP SSE streams (#1390)

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Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
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Anthony 2026-03-31 12:53:52 +02:00 • committed by GitHub
commit 9bc9abc68b
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1 changed files with 80 additions and 1 deletions
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4
packages/client/src/client/streamableHttp.ts
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@ -4,6 +4,7 @@ import type { FetchLike, JSONRPCMessage, Transport } from '@modelcontextprotocol
import {
createFetchWithInit,
isInitializedNotification,
isJSONRPCErrorResponse,
isJSONRPCRequest,
isJSONRPCResultResponse,
JSONRPCMessageSchema,
@ -412,7 +413,8 @@ export class StreamableHTTPClientTransport implements Transport {
if (!event.event || event.event === 'message') {
try {
const message = JSONRPCMessageSchema.parse(JSON.parse(event.data));
if (isJSONRPCResultResponse(message)) {
// Handle both success AND error responses for completion detection and ID remapping
if (isJSONRPCResultResponse(message) || isJSONRPCErrorResponse(message)) {
// Mark that we received a response - no need to reconnect for this request
receivedResponse = true;
if (replayMessageId !== undefined) {