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fix(initialize scenario): return 202 No Content for notifications (closes #274) #299

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fix(initialize scenario): return 202 No Content for notifications (closes #274) #299

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6 changes: 6 additions & 0 deletions src/scenarios/client/initialize.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,12 @@ export class InitializeScenario implements Scenario {
this.handleInitialize(request, res);
} else if (request.method === 'tools/list') {
this.handleToolsList(request, res);
} else if (request.method === 'notifications/initialized') {
// Per MCP spec 2025-11-25 section 2.1 (Sending Messages to the Server),
// point 4: "If the input is a JSON-RPC response or notification ...
// the server MUST return HTTP status code 202 Accepted with no body."
res.writeHead(202);
res.end();
} else {
res.writeHead(200, { 'Content-Type': 'application/json' });
res.end(
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