Garmin Coach MCP

get_heart_rate_data

Fetch detailed heart rate data from Garmin Connect for a specific date, or request summary-only metrics for a daily overview.

Instructions

Get detailed heart rate data for a specific date

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "get_heart_rate_data"
  }
}

Input Schema

Name	Required	Description
`date`	No	Date in YYYY-MM-DD format (defaults to today)
`summary`	No	[DEPRECATED: Use includeSummaryOnly] Return only summary data instead of detailed breakdown (default: false)
`includeSummaryOnly`	No	Return only summary data instead of detailed breakdown (default: false)

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.5.0Oct 1, 2026

TDQS

C2.9/5.0

Behavior2/5

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

With no annotations, the description carries full burden for behavioral disclosure. It only says 'Get' (implying read-only) but does not disclose any other behavioral traits such as rate limits, authentication needs, or what 'detailed' vs 'summary' means in terms of output structure.

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?

A single sentence is very concise and front-loaded with the key action. However, it could be expanded slightly to cover key behavioral aspects without being verbose. It earns a 4 for efficiency but not a 5 due to the sacrifice of completeness.

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

Completeness2/5

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

Given no output schema and no annotations, the description should explain return values and behavior (e.g., what detailed vs summary includes). It does not mention that 'date' defaults to today (though schema does). The description is too sparse to be considered complete for a tool with multiple parameters and possible outputs.

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 the schema already documents all parameters. The description adds the word 'detailed' which relates to the includeSummaryOnly parameter, but this is minimal extra meaning. The baseline of 3 is appropriate as the description does not significantly enhance understanding beyond the schema.

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 clearly states 'Get detailed heart rate data for a specific date', specifying the verb and resource. However, it does not differentiate from sibling tools like 'get_health_metrics' which might also return heart rate data, so it loses one point for lack of sibling distinction.

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

Usage Guidelines2/5

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

The description provides no guidance on when to use this tool versus alternatives. There is no mention of prerequisites, context, or explicit exclusions. The agent has to infer usage from the tool name alone.

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