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Dry Run

by modernmustardseed.com · remote · no sign-in to list tools · v1.0.0 · published by com.modernmustardseed

Monte Carlo cash-flow simulator for a small services business: odds of running short, and why.

Changes · 2
CompareRegistry entry

3 tools: 2 change things and 1 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http dry-run https://mcp.modernmustardseed.com/dry-run

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

3 tools

Changes things 2Claude Code: ask
  • rank_leversTest nine single changes a small business owner can make and rank them by how much each lowers the chance of running short of money in the next 52 weeks, with the change in year-en…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Test nine single changes a small business owner can make and rank them by how much each lowers the chance of running short of money in the next 52 weeks, with the change in year-end money as a tiebreak. The levers: take a third up front, take 15 days off payment terms, raise prices 5 percent, take a fifth less owner draw for six months, cut overhead 10 percent, raise the credit line by half, run one crew lighter, add a crew, and buy three more enquiries a week. Each lever and the baseline run 3,000 simulated years with the same seed, so the difference is the lever and not the luck. Takes the same business description as a cash year simulation: a preset plus any overridden inputs. Pure arithmetic: no network access, nothing stored.

    Annotations the server declares

    • title: Rank levers
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • simulate_cash_yearSimulate the next 52 weeks of a small services business 10,000 times (Monte Carlo) and report the chance it runs short of money, the week that is most likely to happen, reachable m…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Simulate the next 52 weeks of a small services business 10,000 times (Monte Carlo) and report the chance it runs short of money, the week that is most likely to happen, reachable money (bank balance plus unused credit) week by week at the 10th, 50th and 90th percentile, the drivers that separated the futures that ran short from the ones that survived, and the profit the business makes at its own averages. Start from a trade preset (excavation, plumbing, hvac, landscaping, roofing, or general) and override any input: cash, credit line, money owed to the business, work already sold, crews and their weekly cost, overhead, owner draw, monthly bills, enquiries, close rate, seasonality, job types with value, materials, deposit and payment terms, bad debt, tax, and random setbacks. Money is in dollars and rates are fractions (0.3 is 30 percent). The same inputs and seed always return the same answer. Pure arithmetic: no network access, nothing stored.

    Annotations the server declares

    • title: Simulate a cash year
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
Only reads 1Claude Code: allow
  • list_presetsList the six built-in business presets (excavation and septic, plumbing and drain, heating and cooling, landscaping and snow, roofing, and a general small services business) with e…No findings

    Why it is in this group

    • The name "list_presets" says "list": a word for reading.
    Description, as the server wrote it
    List the six built-in business presets (excavation and septic, plumbing and drain, heating and cooling, landscaping and snow, roofing, and a general small services business) with every default input in the exact field names a simulation accepts, and the revenue, costs and profit each makes at its own averages. Static reference: no network access.

    Annotations the server declares

    • title: List presets
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http dry-run https://mcp.modernmustardseed.com/dry-run

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__dry-run__list_presets"
    ],
    "ask": [
      "mcp__dry-run__simulate_cash_year",
      "mcp__dry-run__rank_levers"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as dry-run. Review it before you use it.