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

Annotations already declare readOnlyHint=true, and the description repeats that. It adds the HTTP endpoint, which provides some operational context, but does not describe pagination behavior, response format, or edge cases. With annotations covering the safety profile, the added value is modest.

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 description is two short sentences with no filler. It front-loads the core action and then adds the HTTP method and endpoint, which is efficient and easy to scan.

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 operation with fully documented parameters, the description is nearly complete. The only minor gap is that it does not describe the response shape or pagination metadata, but the schema covers paging inputs and the operation is straightforward.

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 100%, so the schema fully documents videoId, pageSize, and currentPage. The description adds no parameter-level detail beyond what the schema already provides, meriting the baseline score of 3.

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 and resource: 'List chapter tracks for a video.' This distinguishes it from sibling list tools like list_captions and list_videos. The endpoint GET /videos/{videoId}/chapters further pins down the operation.

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 description gives clear context (chapters scoped to a video) but does not explicitly say when to use this tool over alternatives such as list_captions. Usage is implied by the resource name rather than stated with exclusions or alternative conditions.

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