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{"type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_0123pMtsSSJY4qEqeEVT7C9d","type":"tool_result","content":[{"type":"text","text":"Successfully navigated to https://en.wikipedia.org/wiki/World_population.\n## Pages\n1: https://en.wikipedia.org/wiki/World_population [selected]"}]}]},"parent_tool_use_id":null,"session_id":"e78abc88-59d9-438c-b25c-1c7b3f9f7b7e","uuid":"bd144c53-5c9b-4319-bc0f-68ded982835a","timestamp":"2026-04-03T07:29:06.119Z","tool_use_result":[{"type":"text","text":"Successfully navigated to https://en.wikipedia.org/wiki/World_population.\n## Pages\n1: https://en.wikipedia.org/wiki/World_population [selected]"}]}
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{"type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01FqagYHvPwZRSxzzpmAXqMV","type":"tool_result","content":[{"type":"text","text":"Script ran on page and returned:\n```json\n\"World population milestones in billions[62] (Worldometers estimates)\\nPopulation\\n(in billions)\\t1\\t2\\t3\\t4\\t5\\t6\\t7\\t8\\t9\\t10\\nYear\\t1804\\t1927\\t1960\\t1974\\t1987\\t1999\\t2011\\t2022\\t2037\\t2057\\nYears elapsed\\t—\\t123\\t33\\t14\\t13\\t12\\t12\\t11\\t15\\t 20 \\t—\"\n```"}]}]},"parent_tool_use_id":null,"session_id":"e78abc88-59d9-438c-b25c-1c7b3f9f7b7e","uuid":"23e5b3b3-492b-426d-b262-9e1633d57624","timestamp":"2026-04-03T07:29:09.476Z","tool_use_result":[{"type":"text","text":"Script ran on page and returned:\n```json\n\"World population milestones in billions[62] (Worldometers estimates)\\nPopulation\\n(in billions)\\t1\\t2\\t3\\t4\\t5\\t6\\t7\\t8\\t9\\t10\\nYear\\t1804\\t1927\\t1960\\t1974\\t1987\\t1999\\t2011\\t2022\\t2037\\t2057\\nYears elapsed\\t—\\t123\\t33\\t14\\t13\\t12\\t12\\t11\\t15\\t 20 \\t—\"\n```"}]}
{"type":"assistant","message":{"model":"claude-sonnet-4-6","id":"msg_013mku4YxbZJnLHL67ppCbbL","type":"message","role":"assistant","content":[{"type":"text","text":"Here are the years when world population reached each billion milestone, per the Wikipedia table (Worldometers estimates):\n\n| Billion | Year |\n|---------|------|\n| 1 billion | 1804 |\n| 2 billion | 1927 |\n| 3 billion | 1960 |\n| 4 billion | 1974 |\n| 5 billion | 1987 |\n| 6 billion | 1999 |\n| 7 billion | 2011 |\n| 8 billion | 2022 |\n\nNotable observations: the first billion took all of human history until 1804, but subsequent billions came faster — the gap shrank from 123 years (1→2B) down to about 11–15 years for recent milestones."}],"stop_reason":null,"stop_sequence":null,"stop_details":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":324,"cache_read_input_tokens":30291,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":324},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"},"context_management":null},"parent_tool_use_id":null,"session_id":"e78abc88-59d9-438c-b25c-1c7b3f9f7b7e","uuid":"17c55b8b-315a-42ab-bff8-e7c8348f2474"}
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