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fix: enable json response in stateless transport #263

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Merged
HugoRCD merged 1 commit into from
May 19, 2026
Merged

fix: enable json response in stateless transport #263

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5 changes: 5 additions & 0 deletions .changeset/stateless-json-response.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"@nuxtjs/mcp-toolkit": patch
---

fix(transport): use JSON response mode for stateless Node transport
11 changes: 10 additions & 1 deletion packages/nuxt-mcp-toolkit/src/runtime/server/mcp/providers/node.ts
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Expand Up @@ -84,7 +84,16 @@ export default createMcpTransportHandler(async (createServer, event) => {

const server = createServer()
event.context._mcpServer = server
const transport = new WebStandardStreamableHTTPServerTransport({ sessionIdGenerator: undefined })
const transport = new WebStandardStreamableHTTPServerTransport({
sessionIdGenerator: undefined,
// In stateless mode, use JSON responses instead of SSE so that H3 can
// fully await the response and afterResponse fires only after the tool
// handler completes. With SSE the response stream is returned immediately
// (before the handler runs), which causes serverless runtimes to fire
// afterResponse too early and drops any log.set() calls made after async
// work inside the handler.
enableJsonResponse: true,
})
onResponseClose(event, () => {
transport.close()
server.close()
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