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Add Lambda/Serverless Support for Sunpeak MCP Apps #38

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Add Lambda/Serverless Support for Sunpeak MCP Apps #38

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4144028
Expose & Set up config client name in stateless mode
dcguim Apr 7, 2026
5978b16
Remove unecessary logs and unecessary ui uri resource injection
dcguim Apr 7, 2026
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19 changes: 17 additions & 2 deletions packages/sunpeak/src/mcp/production-server.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -143,6 +143,17 @@ export interface ProductionServerConfig {
* where holding open SSE connections is unreliable. Defaults to `true`.
*/
enableJsonResponse?: boolean;
/**
* Override the client name used for domain resolution (e.g. `'chatgpt'`).
*
* Normally, client name is detected from the MCP initialization handshake.
* In stateless/serverless environments where each request creates a fresh
* server instance, the client name won't be available for non-initialize
* requests. Set this to ensure proper domain resolution for resources.
*
* Common values: `'chatgpt'`, `'openai-mcp'`, `'claude'`
*/
clientName?: string;
}

/**
Expand Down Expand Up @@ -194,6 +205,7 @@ export function createProductionMcpServer(config: ProductionServerConfig): McpSe
tools,
resources,
serverUrl,
clientName: configClientName,
} = config;

const mcpServer = new McpServer(
Expand All @@ -218,9 +230,11 @@ export function createProductionMcpServer(config: ProductionServerConfig): McpSe
// Read callbacks close over this variable to resolve host-specific domain maps.
// Also update listing-level _meta on all resources so that `resources/list`
// returns the resolved domain (hosts like ChatGPT check domain from the listing).
let clientName: string | undefined;
// In stateless/serverless mode, use configClientName as the default since
// oninitialized won't fire for non-initialize requests.
let clientName: string | undefined = configClientName;
mcpServer.server.oninitialized = () => {
clientName = mcpServer.server.getClientVersion()?.name;
clientName = mcpServer.server.getClientVersion()?.name ?? configClientName;

for (const handle of resourceHandles) {
const currentMeta = handle.metadata?._meta as Record<string, unknown> | undefined;
Expand Down Expand Up @@ -269,6 +283,7 @@ export function createProductionMcpServer(config: ProductionServerConfig): McpSe
if (typeof result === 'string') {
return { content: [{ type: 'text' as const, text: result }] };
}

return result;
};
};
Expand Down