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

The readOnlyHint annotation already establishes this as a safe read, so the bar is lower. The description adds the backing endpoint (GET /v2/summary/workouts/{user_id}), which is modest context, but says nothing about pagination, result limits, or upstream default behavior for end_date.

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

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

Two tight sentences, zero filler, with the core purpose leading and the endpoint reference trailing. Nothing needs to be trimmed or reordered.

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

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

No output schema exists, but for a simple read of a fully documented parameter set with annotations covering safety, an agent has essentially everything needed to invoke it. Only minor gaps remain, such as behavior when the range is large or how results are ordered.

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

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

Schema description coverage is 100%, with user_id, start_date, end_date, and provider all documented including formats and defaults, so the schema carries the parameter burden. The description adds only the generic 'date range' framing, no syntax or semantic detail beyond the schema.

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

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

States a specific verb (Get), resource (workouts summaries), and scope (for a user over a date range). The resource name cleanly separates it from siblings like vital_get_activity, vital_get_sleep, and vital_get_body, and the underlying endpoint is even cited.

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

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

Usage is only implied by the resource name and the 'over a date range' phrase; there is no explicit when-to-use, when-not-to-use, or pointer to an alternative such as a detailed/timeseries endpoint. Adequate but leaves routing to inference.

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