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

Since the annotations are empty, the description carries the full behavioral disclosure. It reveals stacked cap of 90, that last day without renew deletes the site and frees the slug, that only the same claiming wallet is eligible, and explains the alternate card/PromptPay payment path. These are significant, non-obvious behaviors that an agent must know before calling the 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?

The description is front-loaded with the core purpose and constraint, then continues with nuanced operational rules. Some sentences are dense and combine multiple ideas into a single flowing sentence, but every clause contributes meaningful operational detail. No wń garbage, method but structure could be improved by splitting.

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 no output schema, the description covers everything needed for an agent: when to renew, when not, expiration consequences, payment alternatives for the wallet, support contact, and polling steps after payment. It also covers the 'th likable' slug-free-to-use. The cardinal detail of last-day deletion is explicitly given, avoiding a dangerous edge case.

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 only parameter is 'slug', yet the description never mentions it or explains how to obtain the matching slug. The input schema gives only the type, not the meaning; with schema description coverage at 0%, the description was expected to compensate but does not. The user can infer 'slug' identifies the site to renew, but it is not explicit.

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 first sentence specifies the exact action ('Renew hosting'), resource ('hosting'), duration ('+30 days'), and cost ('$1 USDC'), so the agent immediately knows what this tool does. It also distinguishes itself from 'claim' by stating that after expiry you must claim again as a new site.

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 explicit conditions for using the tool: it is allowed only while the site is live, with remaining < 90 days and a 90-day stacked cap. It explicitly says after expiry renew is unavailable and points to 'claim again' as the alternative. It also describes the no-wallet payment flow through a 402 response and polling, leaving no ambiguity about when 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.