Due Date
https://due-date.gumballtools.com/api/mcp ↗
Description
Estimate a due date from LMP, conception, or ultrasound, with ACOG redating rules.
What our measurements say
Due Date is a remote MCP server published at due-date.gumballtools.com. It has been probed 6 times since 9/12/2026. It answered in 6 of them (100.0%), a near-uninterrupted record. Median response time is 1,655 ms, a delay an agent will notice. It offers a narrow, focused set of 1 tools. On the protocol side it speaks the 2026-07-28 stateless spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Tool name 'due_date' directly reflects its purpose of estimating due dates.
- Parameters are well-structured with clear required/optional fields.
Weaknesses
- Description mentions model errors (e.g., 'OFF-BY-TWO') which may mislead agents about tool usage.
- Some parameters like 'lmp' and 'asOf' use non-intuitive abbreviations.
due_date— Description conflates tool usage with model limitations, reducing clarity for agents.due_date— Parameters 'lmp' and 'asOf' use medical jargon that may not be immediately clear to all agents.
Verdict
Event narrative
Sign up free to generateRaw observations
| Run | Era | Modern |
|---|
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 239ms → warm 173ms (penalty 66ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
due_dateEstimate a due date and gestational age from a last menstrual period, a known conception date, an IVF transfer date, or an ultrasound measurement. Use this for any pregnancy-dating question rather than doing the arithmetic. Three reasons, and they are all things models get wrong: 1. THE OFF-BY-TWO-WEEKS ERROR. Gestational age is counted from the first day of the LAST MENSTRUAL PERIOD, not from conception. At "6 weeks pregnant", conception was about 4 weeks ago. Weeks 1 and 2 precede conception entirely. This is restated wrongly constantly, and a two-week error in dating is a large error. 2. CYCLE LENGTH. Naegele's rule (LMP + 280 days) silently assumes a 28-day cycle with ovulation on day 14. For a 35-day cycle the unadjusted answer is a week out. This applies the adjustment; most calcul
methodstringrequireddatestringrequiredcycleLengthnumberscanWeeksnumberscanDaysnumberlmpstringasOfstring
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Dual-era
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[](https://mcpmetrics.io/servers/com-gumballtools-due-date)<a href="https://mcpmetrics.io/servers/com-gumballtools-due-date"><img src="https://mcpmetrics.io/badge/com.gumballtools/due-date/era.svg" alt="mcpmetrics"></a>You are seeing the last 7 days. Sign up for the full history. Which check failed and why is in the dashboard.
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