{"record":{"id":"ac4dc991661e9ed4","repo":"rohitg00/ai-engineering-from-scratch","slug":"unknown-pattern-pattern-name","errorCode":null,"errorMessage":"Unknown pattern: {pattern_name}","messagePattern":"Unknown pattern: (.+?)","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"phases/11-llm-engineering/01-prompt-engineering/code/prompt_engineering.py","lineNumber":197,"sourceCode":"    rendered = pattern[\"template\"].format(**variables)\n    system = system_override or f\"You are an AI assistant using the {pattern['name']}.\"\n\n    return {\n        \"system\": system,\n        \"user\": rendered,\n        \"temperature\": pattern[\"temperature\"],\n        \"pattern\": pattern_name,\n        \"metadata\": {\n            \"description\": pattern[\"description\"],\n            \"variables_used\": list(variables.keys()),\n        },\n    }\n\n\ndef build_multi_turn(pattern_name, turns, system_override=None):\n    pattern = PROMPT_PATTERNS.get(pattern_name)\n    if not pattern:\n        raise ValueError(f\"Unknown pattern: {pattern_name}\")\n\n    system = system_override or f\"You are an AI assistant using the {pattern['name']}.\"\n    messages = [{\"role\": \"system\", \"content\": system}]\n    for role, content in turns:\n        messages.append({\"role\": role, \"content\": content})\n\n    return {\n        \"messages\": messages,\n        \"temperature\": pattern[\"temperature\"],\n        \"pattern\": pattern_name,\n    }\n\n\ndef format_openai_request(prompt):\n    return {\n        \"model\": MODEL_CONFIGS[\"gpt-4o\"][\"model\"],\n        \"messages\": [\n            {\"role\": \"system\", \"content\": prompt[\"system\"]},","sourceCodeStart":179,"sourceCodeEnd":215,"githubUrl":"https://github.com/rohitg00/ai-engineering-from-scratch/blob/39ea8a1c6d0b61f071226eff7ede4d4105fed820/phases/11-llm-engineering/01-prompt-engineering/code/prompt_engineering.py#L179-L215","documentation":"Error \"Unknown pattern: {pattern_name}\" thrown in rohitg00/ai-engineering-from-scratch.","triggerScenarios":"Thrown at phases/11-llm-engineering/01-prompt-engineering/code/prompt_engineering.py:197 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":"39ea8a1c6d0b61f071226eff7ede4d4105fed820","analyzedAt":"2026-08-26T03:13:46.626Z","schemaVersion":2},"datasetVersion":"2026-08-26T07:17:17.940Z"}