We need to produce JSON with fields: seo_title, summary, key_entities, expert_faq, internal_link_anchor, primary_keyword, secondary_keywords, content_type.

But user only asked: "Rewrite this news as a polished 180-250 word summary. Output ONLY valid JSON."

Wait: In previous system instructions, they gave a JSON schema with many fields. However user now says "Rewrite this news as a polished 180-250 word summary. Output ONLY valid JSON."

But they didn't specify which fields. However earlier in the system prompt they defined a JSON schema with many fields. The user now asks to rewrite as polished summary, output only valid JSON. Likely they still expect the full JSON with all fields as previously defined. The instruction says "Output ONLY valid JSON." So we must output JSON containing the required fields: seo_title, summary, key_entities, expert_faq, internal_link_anchor, primary_keyword, secondary_keywords, content_type.

We must produce a summary of 180-250 words, split into 3-4 paragraphs each 45-65 words, separated by double newline in the summary string. Must bold 3-5 key details across entire summary using double asterisks. Must not use banned words etc.

We must not invent facts. Source is extremely thin: "The leverage that helped fuel the US stock rally is now becoming an increasing source of unease." That's 17 words. We need to elaborate based on what is provided, but not invent facts. We can rephrase, add context, explain implications, but must not add info not in source. However we can add context about leverage in markets generally, but must be directly implied? The source only says leverage helped fuel rally and now is source of unease. We can elaborate on why leverage matters, but must not add numbers not present. However we can mention "investors" etc? The source doesn't mention investors. But we can infer that leverage is used by investors? Might be risky. Must stick strictly to what source says or clearly implied. The source implies that leverag