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

Annotations already declare readOnlyHint=true, openWorldHint=false, and destructiveHint=false, so the safety profile is fully covered structurally. The description adds only the ownership scope ('API key owner's'), contributing modest behavioral context without covering return shape or ordering.

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 front-loaded sentence with no filler. The verb and resource come first, and the qualifying detail follows immediately.

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 zero-parameter, read-only list tool whose annotations fully cover safety, this is nearly complete as a selection aid. The one gap is that without an output schema the description doesn't indicate what the listed entries look like (IDs vs names), though the clip_video reference partially compensates.

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 the schema baseline of 4 applies. The description usefully ties the output to the clip_video.starter_template_id field, giving the agent a sense of what the enumerated values feed into.

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 (List) and resource (starter templates) with an explicit scope (the API key owner's). The trailing reference to clip_video.starter_template_id distinguishes it from the many sibling list_* tools by naming where the results are consumed.

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 clause 'for clip_video.starter_template_id' makes the usage context clear: call this to obtain a valid value for that clip_video parameter. It gives no explicit exclusions or named alternatives, but the purpose-driven context is unambiguous.

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