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

No annotations are provided, so the description carries the full behavioral burden. It usefully declares a strict data-provenance policy: 'No AI, no estimation - only values copied from vendor pages.' That is valuable trust context. However, it does not disclose key operational traits such as pagination, result size, rate limits, or whether missing prices are omitted. For a list tool with no annotations, this is adequate but incomplete.

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 tightly written sentences. The first front-loads what the tool returns, the second immediately states the provenance guarantee. There is no filler and every clause contributes relevant information.

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?

The description covers purpose, scope, and provenance, which is enough for an agent to understand what it will get. However, with no annotations and no output schema, it omits structural details an agent may need, such as the shape of returned records, pagination behavior, and error conditions. For a parameter-light list tool this is passable but leaves gaps.

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% and the single optional category parameter is fully described in the schema with enum-like values. The description adds the semantic frame that the list covers OG-image, screenshot, and template services, reinforcing the category scope. Since zero parameters are required and schema coverage is complete, the baseline is already high; the description does not introduce syntax or format details beyond the schema.

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 clear verb and resource: list every OG-image, screenshot, and template service in the index with published prices and the page each price was read from. This is specific and distinguishes the tool as a comprehensive index lister. It does not explicitly differentiate from siblings like get_service_prices or get_cheapest_by_category, so it falls short of 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 implies the tool is for retrieving the full indexed catalog with source references, but gives no explicit when-to-use guidance, prerequisites, or alternatives. Siblings such as get_service_prices or compare_services are not mentioned, leaving the agent to infer that this is the broad enumeration tool.

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