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  "title": "Circuit breaker: phone request timeline",
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      "text": "Which calls reach the API?",
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      "type": "text",
      "text": "Quote API · fictional example",
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      "text": "CLOSED",
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      "text": "0s  → API timeout",
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      "text": "1s  → API timeout",
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      "text": "2s  → API timeout",
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      "text": "3 failures in 10s → breaker opens",
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      "text": "OPEN",
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      "text": "3s  → blocked locally",
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      "text": "Quote API gets no call",
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      "text": "HALF-OPEN",
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      "text": "32s → one test call",
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      "text": "Success → close breaker",
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      "type": "text",
      "text": "Policy: wait 30s after opening.",
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      "type": "text",
      "text": "A failed probe would reopen it.",
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      "type": "text",
      "text": "Retry is a separate per-request choice.",
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