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Sync My Cycle

The days ahead by phase

get_week_ahead
Read-onlyIdempotent

The days ahead by phase. Use when the user wants to plan training or meals for the week, for example "plan my training this week around my cycle". Returns each day's likely phase, workout focus, intensity and food focus. Not for getting pregnant, fertile days, ovulation timing, contraception or pregnancy: this is general wellbeing only, not for pregnancy planning or contraception, and it is not a fertility calendar. When period_may_be_late is true, days is empty and the say line suggests checking with a doctor

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
tzNoThe user's IANA time zone, for example Europe/London or America/Chicago, so today is the user's today. Optional: country is enough in most places.
dateNoFirst day of the plan, YYYY-MM-DD, a real calendar day. Default today where the user is: from tz, else country, else the request, else UTC.
daysNoHow many days, a whole number from 1 to 35. Default 7.
dietNoAccepted for symmetry with /v1/today; the week view has no food list, so it has no effect here.
countryNoTwo-letter country code (UK is read as GB), used for the time zone of today. Pass it for users outside the US.
last_periodYesFirst day of the user's most recent period, YYYY-MM-DD. Must be within the last 120 days.
cycle_lengthNoUsual cycle length, 20 to 45. Default 28.
period_lengthNoUsual days of bleeding, 2 to 10. Default 5.
last_period_startNoOlder name for last_period, kept for existing callers. Use last_period.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A3.9/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already establish read-only, idempotent, non-destructive behavior, yet the description adds a genuine edge case: when period_may_be_late is true, days is empty and the say line recommends a doctor. That is real behavioral context beyond the annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Purpose and scope are front-loaded and the return fields follow immediately. The pregnancy/contraception exclusion is stated twice in slightly different wording, which is mild redundancy but not enough to obscure the message.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With no output schema, the description compensates by listing the returned fields, and it covers the main edge case. For a 9-parameter planning tool, it is close to complete; a note on how the period_may_be_late signal is derived would close the remaining gap.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so every parameter (including the deprecated last_period_start alias and the no-op diet) is already documented. The description adds no parameter syntax or format detail beyond the schema, so the baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific resource (the days ahead) and enumerates the returned fields (phase, workout focus, intensity, food focus), which clearly separates it from get_todays_phase. It never names the siblings, but 'days ahead' vs a single-day tool is readily inferable.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives a concrete trigger ('plan training or meals for the week') with an example utterance, plus explicit when-not boundaries around fertility/pregnancy/contraception. What it lacks is routing language pointing to get_todays_phase for a single day.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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