{"record":{"id":"654e158cc297bfd8","repo":"n8n-io/n8n","slug":"no-sessionid-provided","errorCode":null,"errorMessage":"No sessionId provided","messagePattern":"No sessionId provided","errorType":"http","errorClass":null,"httpStatus":400,"severity":"error","filePath":"packages/@n8n/nodes-langchain/nodes/mcp/McpTrigger/McpServer.ts","lineNumber":260,"sourceCode":"\t\tresp.flush?.();\n\n\t\t// A not-ready gate makes the CallTool handler short-circuit (returning the\n\t\t// actionable response over the transport instead of executing). Report it as\n\t\t// not a tool call so the node does not also trigger a workflow execution.\n\t\tconst wasGated = !!gateResult && !gateResult.readyToExecute;\n\n\t\treturn {\n\t\t\twasToolCall: MessageParser.isToolCall(rawBody) && !wasGated,\n\t\t\ttoolCallInfo,\n\t\t\tmessageId,\n\t\t};\n\t}\n\n\tasync handleDeleteRequest(req: express.Request, resp: CompressionResponse): Promise<void> {\n\t\tconst sessionId = this.getSessionId(req);\n\n\t\tif (!sessionId) {\n\t\t\tresp.status(400).send('No sessionId provided');\n\t\t\treturn;\n\t\t}\n\n\t\tconst transport = this.sessionManager.getTransport(sessionId);\n\n\t\tif (transport) {\n\t\t\tthis.pendingCallsManager.cleanupBySessionId(sessionId);\n\n\t\t\tif (transport instanceof StreamableHttpTransport) {\n\t\t\t\tawait transport.handleRequest(req, resp);\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tresp.status(405).send('Method Not Allowed');\n\t\t\treturn;\n\t\t}\n\n\t\tresp.status(404).send('Session not found');\n\t}","sourceCodeStart":242,"sourceCodeEnd":278,"githubUrl":"https://github.com/n8n-io/n8n/blob/5ac6606e81f67bb9534255570cd4e86fd8101eee/packages/@n8n/nodes-langchain/nodes/mcp/McpTrigger/McpServer.ts#L242-L278","documentation":"Error \"No sessionId provided\" thrown in n8n-io/n8n.","triggerScenarios":"Thrown at packages/@n8n/nodes-langchain/nodes/mcp/McpTrigger/McpServer.ts:260 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"5ac6606e81f67bb9534255570cd4e86fd8101eee","analyzedAt":"2026-08-12T05:26:35.080Z","schemaVersion":2},"datasetVersion":"2026-08-13T09:17:06.757Z"}