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

Annotations already declare readOnlyHint=true, so the safety profile is covered; the description still adds meaningful context beyond them by noting the call is 'Free' (no credit cost) and that results come newest first. It also previews the returned fields, which the annotations do not mention.

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?

Front-loaded purpose sentence followed by clearly labelled Args and Returns sections; very little waste. The leading 'Free.' fragment is slightly cryptic but still informative about cost.

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 compensates by sketching the return envelope and item fields, and it documents the only parameter including its default. Only pagination/truncation behavior beyond 'newest first' is left unstated for what is a simple list tool.

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 0%, but there is only one parameter and the description does carry its range (1-50) plus a default (24) that the schema omits entirely. That is genuinely additive, though it adds no meaning about what the limit applies to (pages vs. total) or pagination beyond it.

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-less but clear operation: listing Video Studio / AI short / Music Video projects, with scope ('on the web') and ordering ('newest first'). It is distinguishable from studio_get_project (single project) by the plural resource and the items array, though it never names the singleton sibling explicitly.

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?

There is no when-to-use or when-not-to-use guidance and no named alternative (e.g., studio_get_project for a single project, library_list for non-Studio assets). Ordering ('newest first') hints at a browse use case but does not state it.

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