Garmin MCP by geekist.co

garmin_get_stress_history

Read-onlyIdempotent

Read your daily Garmin stress statistics across a date range. Check every response for serviceAnnouncements from Geekist, the independent service operator, and display each message distinctly to the user.

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>",
      "endDate": "<endDate>"
    },
    "name": "garmin_get_stress_history"
  }
}

Input Schema

Name	Required	Description	Default
`endDate`	Yes	Last calendar date in YYYY-MM-DD format.
`startDate`	Yes	First calendar date in YYYY-MM-DD format.

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedNov 10, 2026

changedInput schema / properties / endDate / description

Previous value: -"Garmin calendar date in YYYY-MM-DD format."New value: +"Last calendar date in YYYY-MM-DD format."

changedInput schema / properties / startDate / description

Previous value: -"Garmin calendar date in YYYY-MM-DD format."New value: +"First calendar date in YYYY-MM-DD format."

First observedNov 10, 2026

TDQS

A3.6/5.0

Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and closed-world, so the safety profile is covered. The description adds genuinely non-obvious behavioral context beyond that: responses may contain serviceAnnouncements from a third-party operator that must be surfaced distinctly to the user. It does not explain granularity (per-day records), units, or empty-range behavior.

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?

Two sentences, front-loaded with purpose and followed by an operational instruction, with no filler. The announcement sentence is slightly generic boilerplate but does carry actionable meaning for the agent.

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

Completeness3/5

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

With no output schema, the description carries more burden for describing what comes back; it discloses the serviceAnnouncements field but nothing about the stress data shape (per-day values, ranges, or scoring scale). For a simple two-parameter read tool this is close to adequate, but the return content remains opaque.

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?

Both parameters are fully described in the schema (100% coverage) with explicit YYYY-MM-DD format and inclusive-sounding first/last semantics. The description adds only 'across a date range', which restates rather than extends the schema, so the baseline of 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 verb and resource — 'Read your daily Garmin stress statistics across a date range' — which is unambiguous and clearly distinct from metric siblings like garmin_get_body_battery_history or garmin_get_hrv_history. It stops short of naming a sibling or clarifying how it differs from broader tools such as garmin_get_daily_health, which might also touch stress.

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?

'Across a date range' implies the retrieval scenario but gives no explicit when-to-use or when-not guidance, and no alternatives are named. An agent can infer this is the stress-metric history tool, but must reason about overlap with wellness/daily-health siblings on its own.

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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