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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so safety is covered. The description adds genuine behavioral context beyond that: the top-level 'comment' flag when pricing/stock is not captured, and the credit/charging semantics (2 credits, no data = no charge).

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?

Front-loads the purpose, then the grouping, then per-link fields, then caveats and cost. The long field enumeration is dense but earns its place because no output schema exists; no filler sentences.

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 carries return-value disclosure itself: group order, per-link fields (title, vendor, price, currency, stock, URL status, rating, position, anchor text, update), and the comment caveat. An agent has enough to invoke and interpret it correctly.

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?

Only one parameter (domain) and schema description coverage is 100%, with the example 'connox.com' already in the schema. The description adds no syntax or format information beyond the schema, so the baseline 3 applies.

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 a specific verb+resource ('A brand's current homepage top links') and quantifies scope (up to 10) plus how results are grouped (Products, Categories, Content). An agent can tell it returns links, not an analysis. It does not explicitly distinguish itself from close siblings like get_homepage_analysis or get_homepage_product_shelf_and_markdowns, which keeps it from a 5.

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 explains what is returned and the billing model but gives no when-to-use/when-not guidance and never names an alternative tool. For a niche homepage endpoint with several homepage-adjacent siblings, the routing guidance is a clear gap.

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