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fix: create new MCP transport per request for stateless mode #739

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fix: create new MCP transport per request for stateless mode #739

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13 changes: 6 additions & 7 deletions packages/happy-cli/src/claude/utils/startHappyServer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -74,19 +74,18 @@ export async function startHappyServer(client: ApiSessionClient) {
}
});

const transport = new StreamableHTTPServerTransport({
// NOTE: Returning session id here will result in claude
// sdk spawn to fail with `Invalid Request: Server already initialized`
sessionIdGenerator: undefined
});
await mcp.connect(transport);

//
// Create the HTTP server
// Use a new stateless transport per request as required by MCP SDK >=1.26
// (stateless transports cannot be reused across requests)
//

const server = createServer(async (req, res) => {
try {
const transport = new StreamableHTTPServerTransport({
sessionIdGenerator: undefined
});
await mcp.connect(transport);
await transport.handleRequest(req, res);
} catch (error) {
logger.debug("Error handling request:", error);
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