add_global_public_holiday_working_days

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Use this when you need a 2026-2028 date offset and accept the OpenHolidays nationwide-only, no-inferred-substitute-day reference semantics. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when the task requires a direct official authority, regional/local or employer calendar, substitute-day rules, or dates outside the published coverage. What it computes: Adds or subtracts working days using the pinned OpenHolidays nationwide public-holiday reference and CLDR weekend rule for a supported country. Example user requests: Add five reference working days to 2026-10-23 in Austria. Inputs: start_date (date); territory (enum); working_days (integer, working days). Complete JSON argument examples: {"start_date":"2026-10-23","territory":"AT","working_days":5} Outputs: start_date, result_date, working_days_added [working days], calendar_days_elapsed [days], non_working_weekend_days_skipped [days], public_holidays_skipped, territory, territory_name, weekend_days, holiday_names, holiday_policy, calendar_scope, calendar_profile, substitute_day_policy, source_quality, dataset_version, coverage_start, coverage_end, source_commit. Formula: move one Gregorian day at a time; decrement remaining only when the reference status is_working_day=true Direct REST fallback: POST https://tttkmbb.com/api/v1/calculate/global-public-holiday-add-working-days with the same JSON input fields. Do not guess another /api/* path. Docs: https://tttkmbb.com/everyday/global-public-holiday-add-working-days.md