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

Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=false, covering the safety profile entirely. The description adds no behavioral context beyond usage motivation — no note about date-window defaults, result ordering, or scope limits. With annotations doing the work, the description contributes essentially nothing here.

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?

It is a single short sentence with no padding, so nothing is wasted, but it is a subjectless fragment rather than a front-loaded statement of what the tool returns. Brevity here reflects under-specification more than disciplined conciseness.

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?

The output schema exists and annotations cover the safety profile, so return values and read-only nature need no explanation. What is missing is the one thing only the description can provide: how this planned-workout list differs from sibling list_workouts/get_recent_workouts, leaving the definition minimally viable but incomplete.

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% and both 'from'/'to' already document ISO format and their defaults (today, today+14 days), so the schema fully carries parameter meaning. The description adds no syntax, format, or filtering nuance, which is the expected baseline-3 outcome when the schema is complete.

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?

The fragment 'What's coming up' only implies listing upcoming planned workouts; the resource (planned workouts) comes entirely from the name/title. It gestures at a date-windowed, forward-looking list, which is somewhat distinguishing, but it never states the verb+resource explicitly, so an agent must lean on the tool name to know what it does.

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?

'so the model can answer that and avoid double-booking' does give a use context — answer 'what's coming up' questions and check for conflicts before scheduling — which is better than nothing. However, it names no alternative (e.g. list_workouts for past sessions, get_workout for a specific one) and states no exclusions, so routing versus siblings is left to inference.

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