Tip Splitter MCP. Calculate accurate costs from shared bills.
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Deterministic Fair-Share Tip Splitter calculates complex restaurant bills precisely. It splits costs based on individual items consumed, then proportionally applies taxes and tips across all parties.
Crucially, it resolves fractional penny discrepancies automatically, guaranteeing 100% mathematical closure for the entire group.
What your AI agents can do
Split bill
This function calculates individual shares by accepting a JSON array of items, total tax amounts, and tip percentages for proportional distribution.
The tool determines each person's share of the bill, correctly distributing taxes and tips based on individual items.
It dynamically maps a single menu item to multiple consumers, splitting its cost before applying any secondary rates.
The MCP guarantees 100% mathematical closure by automatically adjusting for missing or extra fractional cents in the total.
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Supported MCP Clients
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Deterministic Fair-Share Tip Splitter: 1 Tool
The single tool available calculates bill shares based on individual items consumed, ensuring proportional distribution of taxes and tips.
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Start using Deterministic Fair-Share Tip Splitter on Vinkius019e38fcsplit bill
This function calculates individual shares by accepting a JSON array of items, total tax amounts, and tip percentages for proportional distribution.
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Works with Claude, ChatGPT, Cursor, and more
The Model Context Protocol standardizes how applications expose capabilities to LLMs. Instead of operating in isolation, your AI gains direct access to external platforms, live data, and real-world actions through secure, standardized connections.
This server provides 1 capabilities that interface natively with Claude, ChatGPT, Cursor, and any MCP client. No middleware. No custom integration required.
The nightmare of reconciling group expenses
You know the drill: The dinner ends, and someone pulls out a massive receipt. Everyone remembers their items, but taxes and tips are added last. You end up in an awkward round table discussion, pulling out your phone to calculate who owes what, cross-checking percentages and worrying if you missed that single penny discrepancy.
With this MCP, you simply hand the data—the item list, the tax rate, the tip percentage—to your agent. It handles the math instantly. You get a clean, final breakdown showing exactly how much each person owes, guaranteed to balance perfectly.
Deterministic Fair-Share Tip Splitter: Precise Splits
The need for complex calculations—mapping shared appetizers vs. individual drinks, and then applying proportional tax/tip rates—disappears. You don't have to worry about the subtle errors or assumptions that plague general AI models.
It’s not just a splitter; it’s an accounting engine. It delivers undeniable mathematical certainty for every single dollar.
What you can do with this MCP connector
Splitting a bill after dinner is always math-heavy. When you have shared appetizers alongside specific drinks, plus tax and tip percentages, general AI models struggle; they often hallucinate decimal distributions or fail to balance the final total. This MCP handles that exact calculation using an internal V8 engine. It first maps consumption: it knows if Nachos were for two people or just one.
Then, it calculates each person's base share. Finally, it takes care of the secondary rates—tax and tip—by distributing them proportionally across everyone’s calculated total. If a fractional cent leaves a discrepancy between the individual shares and the actual receipt amount, the MCP automatically reconciles that penny. You can connect this through Vinkius and let your agent handle financial math that usually requires an Excel sheet.
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How Tip Splitter MCP Works
- 1 You provide the list of items, who ordered them, and the tax rate/tip percentage.
- 2 The MCP processes the inputs through its V8 engine, calculating base shares for all consumers and mapping shared item costs.
- 3 It returns a final breakdown showing exactly how much each person owes, including the reconciled total.
The bottom line is that you get an accurate cash-out statement without having to manually solve complex algebra.
Who Is Tip Splitter MCP For?
Operations managers and finance analysts who deal with expense reports are the primary users. It’s for anyone tired of using spreadsheets just to figure out who owes what after a group dinner.
They use this MCP when gathering receipts from multiple team members, ensuring every single expense is allocated fairly and accurately before submitting the report.
When managing client dinners or group site visits, they need a reliable way to split costs that account for varying consumption levels and local tax rules.
They rely on this tool when processing shared vendor invoices where the taxable amount needs precise allocation among partners or staff members.
What Changes When You Connect
- Stop manually balancing books. The
split_billfunction handles the entire math process, eliminating rounding errors that mess up expense reports. - It correctly accounts for mixed consumption. If one person orders a drink and two share an appetizer, the MCP splits those costs accurately.
- You get guaranteed mathematical closure. When fractions of a penny cause discrepancies between individual totals and the receipt grand total, this MCP fixes it automatically.
- The calculation is fast and deterministic. Since it runs natively in V8, you don't wait on heavy external library calls; the result comes through instantly.
- It separates base costs from overhead. It first splits out the cost of goods sold, then proportionally applies the tax and tip burden.
Real-World Use Cases
The client dinner needs splitting
A PM receives a bill for three people: Client A had wine ($30), Client B had salad ($12), and all shared nachos ($10). The agent uses split_bill with the tax and tip percentages to determine that Client A owes $38.07, and Client B owes $19.03. It's instant.
Handling purely shared group costs
Three colleagues share a large steak dinner ($90). They need to split the total cost plus tax and tip. The agent runs split_bill and gets a precise breakdown, ensuring the final payments of $37.16 and $37.17 perfectly match the bill's grand total.
Reconciling complex vendor invoices
A small business owner receives an invoice for shared catering ($45). They need to know how much tax/tip applies proportionally if one department used $30 worth of food and another used $15. Using split_bill gives them the exact allocation percentage.
Comparing cost estimates
An architect needs to estimate costs for a meeting involving shared catering and individual coffee orders. They run split_bill with sample numbers, allowing their agent to immediately compare potential expenditures across different scenarios.
The Tradeoffs
Relying on general AI math
Asking a general-purpose agent to split $100 with tax and tip. The result is usually slightly off, maybe missing the extra penny or miscalculating proportions.
→
You must use split_bill. This MCP handles the complex mathematics—specifically the proportional distribution of taxes and tips—and guarantees that the final numbers add up exactly to the receipt total.
Manual spreadsheet calculation
Opening Excel, creating columns for base cost, tax %, tip %, multiplying everything out, and manually checking the penny balance. This takes 15 minutes of focus.
→
Feed the data into this MCP using split_bill. It processes all those calculations—including shared item mapping and reconciliation—in seconds.
Only calculating base cost
Calculating just how much each person spent on items, but forgetting to factor in the tax and tip burden. The final numbers are wrong.
→
The split_bill tool requires you to provide both the item list and the total tax/tip percentages, ensuring every component of the bill is distributed correctly.
When It Fits, When It Doesn't
Use this MCP if your primary need is mathematically accurate division of a shared financial expense. You need to ensure that when items are split, the resulting individual totals account for proportional taxes and tips, AND that those final numbers sum up perfectly to the original grand total (the penny reconciliation). Don't use it if you simply need to divide a bill into equal shares; in that case, general arithmetic is fine. You also don't use it if you just need to calculate sales tax on one single item. The power of this MCP lies in its deterministic handling of the shared burden (tax/tip) across unevenly consumed items. If your calculation needs more than basic addition or subtraction, but involves financial reconciliation, this is your tool.
Common Questions About Tip Splitter MCP
How does deterministic fair-share tip splitter handle shared items? +
The MCP maps the item first. When you use split_bill, it determines that a shared item, like Nachos, is split proportionally among all listed consumers before calculating the individual base costs.
Is this tool better than just splitting by equal shares? +
Yes. If you divide expenses equally, you ignore consumption differences and fail to allocate tax/tip proportional to usage. This MCP calculates based on actual item value.
Does the split_bill function fix penny rounding issues? +
Absolutely. The core strength of this tool is its reconciliation algorithm; it guarantees that the sum of all individual payments equals the original grand total, even down to the cent.
What inputs does I need for split_bill? +
You must provide three things: a JSON array detailing the items and who ordered them, the total tax amount, and the tip percentage.
How does using the split_bill function perform when handling many line items? +
The calculation is extremely fast because it runs natively within a rigorous V8 mathematical engine. This guarantees quick, deterministic results even with complex ratios and numerous consumed items.
If my bill details are incomplete, what happens when running split_bill? +
The tool requires all necessary inputs, including the total taxAmount and tipPercentage. Providing partial or malformed data will trigger an immediate validation error, preventing any inaccurate calculations.
Is the split_bill function compatible with various AI agents and clients? +
Yes. Because this MCP adheres to the Model Context Protocol standard, any AI client connected via Vinkius can access and use it. It works regardless of your agent's underlying technology.
Does split_bill support currencies other than USD? +
The core mathematical engine supports various currency formats. You just need to ensure that the input data you pass to the function is correctly structured and formatted for calculation.
How does it handle shared items like an appetizer? +
The agent passes an array of 'consumers' for each item. If 'Nachos' ($15) has consumers ['John', 'Jane'], the engine automatically divides the base cost ($7.50 each) before proportionally applying their individual tax and tip burden.
Why do LLMs fail at this without an MCP? +
LLMs lack true mathematical persistence. When calculating multi-step proportions (subtotal -> ratio -> tax allocation -> tip allocation -> fractional rounding), they often lose tracking of pennies, resulting in individual totals that don't add up to the receipt's grand total.
What is the 'Penny Reconciliation Algorithm'? +
Due to floating-point toFixed(2) rounding on 5 different people, the sum of individual owed amounts might equal $100.01 while the actual grand total is $100.00. The engine detects this and surgically subtracts or adds the penny discrepancy to guarantee an exact match.
Use it with your favorite AI tools
Connect this server to Cursor, Claude, VS Code, and more.