leavesheet-mcp

MCP server (stdio) for two payroll calculations used by LeaveSheet / TableTemplates:

• U.S. DOL WH-347 certified payroll form, revised version (Rev. January 2025): columns 2 and 5-9 for a crew week, fringe paid to each plan, column 6B reconciliation.
• PTO accrual: leave balance at a date, with hire date, annual cap, tenure tiers, carryover cap, approved and pending requests, holidays and half days.

The calculations are a line-by-line JavaScript port of the open-source Go packages codeberg.org/tresor2k/tabletemplates-go/wh347, .../pto and the wh347 command (.../cmd/wh347). The test suite checks the output byte for byte against those Go engines on 28 golden cases. No network access, no data stored.

Install

Requires Node.js 22 or later.

{
  "mcpServers": {
    "leavesheet": { "command": "npx", "args": ["-y", "leavesheet-mcp"] }
  }
}

Tools

Inputs

wh347_payroll_lines and wh347_fringe_reconcile take { "workers": [...] }, one entry per worker-week on one project. Field names follow the CSV columns of the wh347 command: worker, type (J, RA or empty), base_rate, fringe_health_welfare, fringe_pension, fringe_vacation, fringe_training, st_hours and ot_hours (arrays of up to 7 daily values), cash_in_lieu_rate, gross_all_work (column 7B; omit it to use 7A), fica, federal_tax, state_tax, other_deductions. Omitted numbers are 0; negative numbers are rejected. csv_line in the output is the line the worker would have in the equivalent CSV (header = line 1).

pto_accrual takes policy (period: monthly or annual, rate, annual_cap, carryover_max, optional tier1_years/tier1_bonus, tier2_years/tier2_bonus), hire_date, as_of, carryover, requests (start, end, start_half, end_half, status: pending, approved, denied or cancelled), holidays (dates) and us_federal_holidays_years (adds the 11 U.S. federal holidays, observed dates, of the listed years). Dates are YYYY-MM-DD.

Example

wh347_payroll_lines input:

{ "workers": [{ "worker": "John Mason", "type": "J", "base_rate": 30,
  "fringe_health_welfare": 4, "fringe_pension": 2,
  "st_hours": [8, 8, 8, 8, 8], "ot_hours": [4], "other_deductions": 310 }] }

Output:

{
  "form": "WH-347 (Rev. January 2025)",
  "lines": [
    {
      "csv_line": 2,
      "worker": "John Mason",
      "worker_type": "J",
      "st_hours": 40,
      "ot_hours": 4,
      "total_hours": 44,
      "rate_6a_st": 30,
      "rate_6a_ot": 45,
      "fringe_6b": 264,
      "cash_in_lieu_6c": 0,
      "gross_project_7a": 1380,
      "gross_all_work_7b": 1380,
      "gross_all_work_7b_entered": false,
      "deductions_8": 310,
      "net_pay_9": 1070,
      "sanity": "ok"
    }
  ],
  "plan_totals": { "health_welfare": 176, "pension": 88, "vacation": 0, "training": 0 },
  "plan_totals_sum": 264,
  "fringe_column_6b_sum": 264,
  "reconciles": true,
  "source": "TableTemplates LeaveSheet WH-347 engine (port of codeberg.org/tresor2k/tabletemplates-go/wh347)",
  "reference_url": "https://tabletemplates.com/certified-payroll-software/",
  "disclaimer": "Calculator output only: not legal or payroll advice, not an official DOL tool."
}

pto_accrual with a monthly policy of 1.25 days (+0.25 after 2 years, cap 15, carryover cap 5), hired 2023-04-03, 9 days carried over, one approved request from 2026-06-29 to 2026-07-07 and the 2026 federal holidays, as of 2026-07-31:

{
  "balance": {
    "months_worked": 7,
    "years_of_service": 3.328767123287671,
    "effective_rate": 1.5,
    "accrued": 10.5,
    "carryover": 5,
    "taken": 6,
    "pending": 0,
    "left": 9.5,
    "is_negative": false
  },
  "request_days": [6],
  "source": "TableTemplates LeaveSheet PTO engine (port of codeberg.org/tresor2k/tabletemplates-go/pto)",
  "reference_url": "https://tabletemplates.com/pto-tracking-software/",
  "disclaimer": "Calculator output only: not legal or payroll advice; state paid-leave laws are not encoded."
}

(July 3, 2026 is the observed Independence Day, so the 7 weekdays of the request count as 6.)

Limits

• Not an official DOL tool, not legal or payroll advice. The WH-347 tool does not look up prevailing wage rates, classify work, or compute taxes: rates and deductions are entered. The ST/OT split is entered, not computed.
• WH-347 amounts are rounded to cents in the output only (halves toward +infinity), never inside the calculation. PTO values are not rounded.
• PTO: month-granular accrual (the hire month counts in full), years of service = days / 365, accrual restarts on January 1; the carryover is the value you enter, capped by the policy. State paid-leave laws are not encoded; the only built-in holidays are the U.S. federal ones.

Development

npm install
npm test                      # parity with the Go engines + stdio smoke test
node scripts/gen-golden.mjs   # regenerate test/golden.json (needs Go 1.24 and the Go sources)

License: MIT.