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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds context about which service backs the id, but says nothing about not-found behavior, error handling, or what a 'scheduled workout' contains, which is the sort of detail that would earn a higher score.

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 short sentences with the purpose front-loaded and no filler. The second sentence is legitimately informative rather than padding, though the first sentence's fragment form costs it a perfect mark.

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?

With no output schema, the description should ideally hint at the shape of the returned scheduled workout and error cases. It only covers the id/endpoint distinction, which is helpful but leaves the agent without a return-value or failure picture.

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%, so the single `scheduledWorkoutId` parameter is already documented as 'Numeric id'. The description adds only that the id belongs to the scheduled-workout namespace; it does not resolve the schema's integer|string type union or say where a valid id comes from.

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 description names the resource (a single scheduled workout) and the key (scheduled-workout id), and explicitly contrasts itself with `getScheduledWorkouts` by endpoint base. The opening is a fragment with no verb ('One scheduled workout by its scheduled-workout id'), and it does not distinguish itself from other nearby siblings such as `get_next_scheduled_workout` or `get_scheduled_workout_summaries`, so it falls short of a 5.

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?

The endpoint note implies that this tool takes ids from the `/workout-service/schedule` namespace rather than `/calendar-service`, which is a useful usage signal. However, it never states when an agent should choose this over `get_scheduled_workouts`, `get_scheduled_workout_summaries`, or `get_next_scheduled_workout` — the routing is only implied.

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