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Old pattern

Do not scrape terminal output: 
sf portfolio history | grep ...

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New pattern

Use JSON: 
sf portfolio history --json --ticks 20 --trades 10 --since 2026-04-23
Parse stdout as one JSON document.

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Error handling

Use exit code and JSON error envelope: 
sf query x --json
returns: 
{
  "ok": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Query must be at least 2 characters."
  }
}

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Discovery

Replace hardcoded command assumptions with: 
sf describe --all --json