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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered. The description adds nothing beyond that — no mention of pagination, result ordering, size limits, or whether it spans all projects. It essentially restates the resource contents.

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?

One short clause with no padding, so nothing wasted, but it is a content inventory rather than a front-loaded statement of function. Brevity here reflects under-specification rather than efficient information packing.

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?

For a simple read-only list tool with no output schema, the description should at least say what is returned (file objects, metadata) and whether results are scoped or paginated. None of that is present, so an agent knows only that a media library exists, not what calling this yields.

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?

There is a single optional parameter and the schema description coverage is 100%, with project_id clearly documented including the default behavior and the list_projects reference. Baseline 3 applies since the schema does all the work and the description adds no parameter detail.

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 is a noun fragment ('The media library: videos, photos, audio, documents') that names the resource domain but never states the action. It only implies a listing via the tool name and title, and does not distinguish it from the many other list_* siblings. An agent must rely on the name and title to know this enumerates files.

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 when-to-use guidance, no alternatives named, no prerequisites. With roughly 40 sibling tools including list_agents, list_calls, list_inventory and list_notes, the agent gets no help deciding that this is the one for media assets rather than textual/structured resources.

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