{"record":{"id":"a619a63352a58d9f","repo":"earendil-works/pi","slug":"mistral-stream-ended-without-a-finish-reason","errorCode":null,"errorMessage":"Mistral stream ended without a finish reason","messagePattern":"Mistral stream ended without a finish reason","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"packages/ai/src/api/mistral-conversations.ts","lineNumber":155,"sourceCode":"\n\t\t\tconst normalizeMistralToolCallId = createMistralToolCallIdNormalizer();\n\t\t\tconst transformedMessages = transformMessages(context.messages, model, (id) => normalizeMistralToolCallId(id));\n\n\t\t\tlet payload = buildChatPayload(model, context, transformedMessages, options);\n\t\t\tconst nextPayload = await options?.onPayload?.(payload, model);\n\t\t\tif (nextPayload !== undefined) {\n\t\t\t\tpayload = nextPayload as MistralChatPayload;\n\t\t\t}\n\t\t\tconst mistralStream = await requestMistralStream(model, payload, apiKey, options);\n\t\t\tstream.push({ type: \"start\", partial: output });\n\t\t\tawait consumeChatStream(model, output, stream, mistralStream);\n\n\t\t\tif (options?.signal?.aborted) {\n\t\t\t\tthrow new Error(\"Request was aborted\");\n\t\t\t}\n\n\t\t\tif (output.stopReason === \"pending\") {\n\t\t\t\tthrow new Error(\"Mistral stream ended without a finish reason\");\n\t\t\t}\n\t\t\tif (output.stopReason === \"aborted\" || output.stopReason === \"error\") {\n\t\t\t\tthrow new Error(output.errorMessage || \"An unknown error occurred\");\n\t\t\t}\n\n\t\t\tstream.push({ type: \"done\", reason: output.stopReason, message: output });\n\t\t\tstream.end();\n\t\t} catch (error) {\n\t\t\tfor (const block of output.content) {\n\t\t\t\t// partialArgs is only a streaming scratch buffer; never persist it.\n\t\t\t\tdelete (block as { partialArgs?: string }).partialArgs;\n\t\t\t}\n\t\t\toutput.stopReason = options?.signal?.aborted ? \"aborted\" : \"error\";\n\t\t\toutput.errorMessage = formatMistralError(error);\n\t\t\tstream.push({ type: \"error\", reason: output.stopReason, error: output });\n\t\t\tstream.end();\n\t\t}\n\t})();","sourceCodeStart":137,"sourceCodeEnd":173,"githubUrl":"https://github.com/earendil-works/pi/blob/4af9d21d3b4d664e4a29fcabfec85171077248e3/packages/ai/src/api/mistral-conversations.ts#L137-L173","documentation":"Error \"Mistral stream ended without a finish reason\" thrown in earendil-works/pi.","triggerScenarios":"Thrown at packages/ai/src/api/mistral-conversations.ts:155 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Retry; check for stream truncation before a finish reason arrived."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"4af9d21d3b4d664e4a29fcabfec85171077248e3","analyzedAt":"2026-08-24T13:07:14.692Z","schemaVersion":2},"datasetVersion":"2026-08-24T17:17:21.512Z"}