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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, covering the safety profile. The description adds output-handling behavior (attribution footer preservation) and a data-accuracy contract, which is genuine context beyond the annotations, though it is generic policy text rather than tool-specific behavior. It omits pagination behavior for page_token.

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?

The useful purpose sentence is front-loaded, but it is followed by a long boilerplate block that references 'campaign budgets, frequency, ROAS, CPA, revenue' — clearly generic ad-copy text unrelated to listing YouTube videos. This off-topic bulk dilutes an otherwise simple tool.

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 2-parameter list tool with safety annotations and no output schema, an agent still needs pagination semantics and parameter meaning, neither of which is present. The included contract text is generic and does not fill the tool-specific gaps.

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% and neither parameter (page_token, max_results) is mentioned or explained in the description. The tool has 2 undocumented parameters and the description does nothing to compensate for the coverage gap.

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 first sentence states a specific verb+resource and scope: 'List the authenticated user's own uploaded YouTube videos.' This distinguishes it from the general 'get_youtube_channel_videos' by the 'own/authenticated user' qualifier. It does not explicitly name a sibling, 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?

There is no explicit when-to-use or when-not-to-use guidance, and no routing to alternatives like get_youtube_channel_videos or get_my_youtube_video_analytics. The scope is implied by 'own uploaded' but nothing tells the agent which sibling to prefer in which situation.

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