Use this skill whenever the user wants to do anything with PDF files. This includes reading or extracting text/tables from PDFs, combining or merging multiple PDFs into one, splitting PDFs apart, rotating pages, adding watermarks, creating new PDFs, filling PDF forms, encrypting/decrypting PDFs, extracting images, and OCR on scanned PDFs to make them searchable. If the user mentions a .pdf file or asks to produce one, use this skill.
当任务以表格数据为中心（CSV/Excel/TSV/JSON/Parquet）并需要分析、清洗、聚合、可视化、导出时，必须使用本技能。该技能强调人类数据分析师式流程：先多轮探查数据，再分段写小块 Python 代码逐步求解。禁止跳过探查直接编码，禁止一次写大段复杂代码。
Use this skill for any task that requires in-depth research, investigation, or comprehensive report generation on a topic. This includes: producing industry analysis, market research, technology surveys, competitive intelligence, trend reports, or any deliverable that synthesizes information from multiple sources into a structured long-form document; answering complex questions that require gathering evidence from the web, analyzing data, and presenting findings with charts and citations; any request where the user explicitly asks for a 'report', 'research', 'survey', 'white paper', or 'deep dive'. Trigger especially when the task cannot be answered from memory alone and requires active information gathering. Do NOT trigger for simple factual Q&A, code-only tasks, single-file data analysis (use data-analysis skill), or creative writing without research backing.