InstaDomain

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

No annotations provided, so description carries full burden. Discloses critical Stripe checkout session creation (payment flow) and 1-year limitation. However, misses idempotency, error states, or post-payment completion requirements despite being a financial transaction tool.

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?

Efficient three-part structure: purpose statement, behavioral mechanism (Stripe), parameter definition. No redundant text; every sentence conveys unique information about scope, payment method, or input requirements.

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?

Adequate given output schema exists (no need to describe returns). Covers the essential renewal flow and parameter meaning. However, for a payment mutation with no annotations, could disclose side effects, failure modes, or authentication requirements to reach 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 coverage is 0%, requiring description to compensate. Successfully explains order_id semantics ('completed domain purchase') and provides format example ('ord_abc123'). Clear documentation for the single required parameter.

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 specific action (renew) and scope (1 additional year) clearly. Uses 'renewal' terminology which implicitly distinguishes from sibling buy_domain, but lacks explicit guidance on when to choose this over initial purchase tools.

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?

No explicit when-to-use or when-not-to-use guidance. Does not mention prerequisites like 'domain must be owned' or contrast with buy_domain for new registrations. Only implicit context from 'completed domain purchase' reference.

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