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

Annotations already declare readOnlyHint=true, openWorldHint=false and destructiveHint=false, so safety is covered. The description adds only that the videos are trainer-recorded for exercises, with no word on whether it returns media URLs, metadata, counts, or ordering — minimal value beyond structured fields.

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?

A single short sentence with no padding, though it opens with the object rather than the action the tool performs. Nothing is wasted, but it is also under-loaded rather than front-loaded with actionable information.

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 and no parameters, the description is the only place to explain what comes back (e.g., video URLs, exercise names) and whose videos are returned, and it does neither. For a simple read tool this is thin even by low-complexity standards.

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?

The tool takes zero parameters, so there is no parameter semantics for the description to explain; the baseline for 0 params is 4. Nothing in the description misleads about inputs.

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 sentence identifies the resource (videos recorded by the trainer for exercises) but is a noun fragment with no verb telling the agent it lists/returns them. The tool name carries the action ('list'), so the description only restates the object rather than adding a specific verb+resource statement.

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?

No indication of when to use this versus related siblings such as list_exercise_templates, list_favorite_exercises, or list_student_workouts. An agent must infer the distinction ('my' videos vs. catalog/exercise templates) purely from the name.

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