Loading ToolBench
Garmin MCP has 21 well-named tools with consistent verb_noun patterns (get_*, all READ_ONLY). Descriptions are present and adequate (avg ~80 chars), explaining what each tool returns. Input schemas are visible and properly typed (string dates, integer limits). However, parameter descriptions are minimal, most lack detail on format constraints, valid ranges, or when to use one tool vs. another. Output schemas are not documented; LLMs cannot predict response structure. Error handling is absent, no guidance on retryability, rate limits, or recovery paths. No tool annotations (readOnlyHint present implicitly via naming but not declared). Missing dependency hints between related tools (e.g., when to call get_recent_activities vs get_activities_by_date). Composition is sound, each tool has one responsibility, but descriptions could better explain the distinction between single-day and range variants.
Activities in a date range, optionally filtered by activity type.
Body battery values for a day.
Body battery values across a date range (single Garmin API call).
Weight, BMI, body fat, muscle mass, etc. for a day.
Daily summary: steps, calories, resting HR, stress, body battery, intensity minutes.
Daily step aggregates over a date range. Auto-chunked for ranges > 28 days.
Output schemas not documented. LLMs cannot predict response structure (fields, types, nested objects). Agents must infer from trial-and-error or context.
Parameter descriptions lack format constraints and valid ranges. E.g., 'day' parameter says 'ISO date (YYYY-MM-DD)' but does not specify if past dates are allowed, how far back, or what happens if the date is in the future.
No error handling guidance. Tools do not document what happens on invalid dates, rate limits, authentication failures, or missing data. LLMs have no recovery path.
Inferred effective spec: <=2025-11-25.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-23 | C | 63 | <=2025-11-25 | v2 |
Floors ascended/descended for a day.
Heart-rate samples plus resting HR for a day.
Heart-rate samples + resting HR for each day in a date range, fetched in parallel.
Overnight HRV data for a day.
Overnight HRV for each day in a date range, fetched in parallel.
Daily stats for the last N days (default 7), fetched in parallel. Handy for trend analysis.
Most recent activities (defaults to last 10).
Nightly sleep analysis (stages, scores, SpO2, HRV, respiration).
Nightly sleep analysis for each day in a date range, fetched in parallel.
Intraday step samples for a single day.
Stress levels and rest/active durations for a day.
Stress levels and durations for each day in a date range, fetched in parallel.
Training readiness score(s) for a day.
Training readiness scores for each day in a date range, fetched in parallel.
Return the Garmin account display name, full name, and unit system.
Single-day vs. range-variant tools lack dependency hints. Descriptions do not explain when to call get_sleep_data vs get_sleep_data_range, or whether range tools auto-chunk large requests.
No tool annotations. Tools are READ_ONLY but lack explicit readOnlyHint declarations in schema. Agents cannot programmatically determine safety without parsing names.