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

Annotations already declare readOnly/destructive hints, and the description adds meaningful behavioral context beyond them: the tool does not render or charge. It also clarifies hookTemplateId's effect ('seeds the brief from Opening hooks') and distinguishes script opening from caption style, which is valuable behavioral nuance.

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?

Two sentences are used efficiently, with the core purpose front-loaded. The parenthetical about caption style is slightly dense but earns its place by preventing a common misunderstanding.

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 an output schema present, annotations covering safety, and near-complete parameter documentation, the description covers the essential invocation context well. It could be more complete by explicitly routing to generation/quoting sibling tools, but that gap is better attributed to usage guidance than overall completeness.

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 baseline is 3. The description reinforces the url/brief choice and hookTemplateId behavior, but it does not add meaning that the schema does not already provide.

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 names a specific verb and resource ('Research a Talking Short') and identifies the two accepted inputs (product URL or brief). It also distinguishes itself from sibling tools by explicitly stating it 'does not render or charge,' making the purpose unambiguous.

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 implies use when you need a Talking Short researched before rendering, and the 'does not render or charge' line provides exclusion criteria. However, it never explicitly names alternatives like generate_talking_short or quote_talking_short, nor gives direct when-to-use versus when-not-to-use guidance.

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