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

Beyond annotations, it discloses concrete side effects: one confirmation email and a later invite email, plus 'No newsletter'. It also states the consent requirement and privacy policy link, which are valuable behavioral details for an external write action.

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 front-loaded with the core action and scope, then adds only useful behavioral and compliance details. Every sentence contributes to correct invocation.

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 external waitlist action with complete parameter descriptions and rich annotations, the description covers purpose, side effects, consent, and privacy context. No output schema exists, so return-value explanation is not required.

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 coverage is 100%, so the baseline is 3. The description adds meaningful semantics for the email parameter by requiring the user's own address and consent, and it reinforces the waitlist context for device and interests.

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 states a specific verb and resource: putting the user on the Protoship waitlist. It also scopes the use to PCBs, 3D prints, CNC parts, sheet metal, or devices outside the catalog, which distinguishes it from catalog/order-oriented siblings.

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?

It gives a clear use context by describing the waitlist categories and 'outside the catalog' condition. It also adds consent and own-email constraints, but it does not explicitly name sibling alternatives or when not to use this tool.

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