mcp-transport-statefulne-sse-transport-statefulness-breaks-in-serverless-en-7e3ee7e5

THEN Use Streamable HTTP transport (stateless mode) instead of SSE for serverless deployments. If SSE is required, persist session state in an external database (e.g., DynamoDB) rather than in-memory storage to ensure all instances can access the transport context.

// Streamable HTTP stateless mode (recommended for serverless)
const transport = new StreamableHTTPServerTransport();
// No session management needed.

// SSE with DynamoDB persistence (workaround)
// Store transport state upon GET, retrieve on POST using sessionId.