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

Annotations already mark this as read-only, idempotent, and non-destructive. The description adds useful behavioral context by specifying that the tool returns product, pricing, and privacy information rather than producing a video or photo.

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 with no filler. The product definition is front-loaded, and the call triggers are compactly listed in one sentence. Every phrase earns its place.

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 informational tool with strong safety annotations and no output schema, the description covers what the tool does, what it returns, and when to invoke it. Nothing essential for correct invocation is missing.

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 has no parameters and schema coverage is effectively complete, so the baseline for zero-parameter tools applies. The description still adds value by indicating the content areas covered (what it is, how it works, prices, privacy).

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 the tool's job with a specific verb ('Describe') and resource ('GrowingUpVideo'), plus a one-line definition of what the product does. This clearly distinguishes it from the sibling tools as informational rather than creation or advice.

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?

Explicitly lists call triggers: 'when the user asks what they can do with old photos... or asks about price.' It gives clear conditions but does not name the sibling tools as alternatives or state when not to call it, missing the top tier.

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