All servers · Payments & accounting

Penny Rounding

com.gumballtools/penny-rounding · v0.1.0

Instruction-like text in descriptions

Measured by MCP Station

Last check	Reachable
Checked at	—
Check success 7 / 30 days	—
First-try success 30 days	—
Median response	—
Lookups 30 days	—
Authentication	No auth
MCP version	2025-06-18
Rank score	—
Declared risk	Read-only (all tools declare readOnlyHint)
Capabilities declared	tools
Tool definitions	3 tools · with description 100% · input schema is an object 100% · read/destructive hints 100%

Instruction-like text was found in round_cash_total. This is a pattern match, not a verdict. What we look for

Round cash totals to the nearest nickel correctly — after tax, on the total, cash only.

streamable-http · https://penny-rounding.gumballtools.com/api/mcp

claude mcp add --transport http penny-rounding https://penny-rounding.gumballtools.com/api/mcp

{
  "mcpServers": {
    "penny-rounding": {
      "url": "https://penny-rounding.gumballtools.com/api/mcp"
    }
  }
}

round_cash_total
Settle a transaction under post-penny cash rounding: exact subtotal, tax on the exact subtotal, then round the final total to the nearest nickel — and only for cash. Use this for any "what does X round to" or "what do I owe in cash" question. Four things are wrong in most explanations of this, and e
rounding_impact
Compute what cash rounding is actually worth across a list of prices: mean delta per transaction, the up/down/unchanged split, and a per-thousand figure. Use this whenever someone asks whether rounding costs or earns money — a very common question and one usually answered with a guess. Do not guess.
price_band
For a list price and a tax rate, find every nearby list price that settles to the SAME cash total, and the highest one. Use this for "what price should I charge" and "can I price to gain from rounding" questions. There is exactly one free move here and it is easy to get backwards, so do not reason a

Repository · Website · JSON · Text for agents · Registry updated 2026-09-05