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garminconnect-js

garminconnect-js

by DynamicsNinja
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Hybrid

get_body_composition

Read-only

Fetch body-composition data for a given date or date range from Garmin Connect; enddate defaults to startdate.

Instructions

Body-composition data for a date or a date range (enddate defaults to startdate). GETs /weight-service/weight/dateRange; throws GarminError if startdate > enddate getStatsAndBody (wellness service) now delegates to this instead of inlining its own copy of the same call.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "startdate": "<startdate>"
    },
    "name": "get_body_composition"
  }
}

Input Schema

NameRequiredDescriptionDefault
enddateNoCalendar date, YYYY-MM-DD (UTC)
startdateYesCalendar date, YYYY-MM-DD (UTC)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A3.8/5.0
Behavior4/5

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

Annotations already cover the safety profile (readOnlyHint=true, openWorldHint=true), and the description adds real behavioral context beyond them: the enddate default, the GarminError thrown when startdate > enddate, the underlying endpoint, and the delegation relationship. It stops short of describing return shape or pagination.

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?

Front-loaded with the core scope before the endpoint and delegation detail. The trailing clause about getStatsAndBody delegating is internal implementation trivia that adds little for an agent deciding how to call the tool.

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?

For a two-parameter read tool with no output schema, the description covers scope, defaulting, and the one failure mode. The main remaining gap is that 'body-composition data' is not elaborated into what fields come back, which would matter since no output schema exists.

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

Parameters4/5

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

Schema coverage is 100%, so the baseline is 3, but the description adds the default behavior of enddate ('defaults to startdate'), which is not expressed anywhere in the schema. That is genuine semantic value beyond the structured fields.

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?

States a specific verb+resource ('Body-composition data') and its scope (a date or a date range), and the delegation note about getStatsAndBody hints at how it relates to the sibling get_stats_and_body. It does not, however, explicitly contrast itself with the other weight-adjacent readers like get_weigh_ins or get_daily_weigh_ins.

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

Usage Guidelines3/5

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

Usage is implied by the scope ('for a date or a date range') and the note that getStatsAndBody delegates here suggests this is the canonical call. There is no explicit when-to-use / when-not-to-use statement or named alternative for the agent to route between.

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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