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

The annotation already declares readOnlyHint=true, so the description adds value by disclosing that the tool moved behind a paywall on a specific date and is priced per call with plan inclusions. This is useful operational behavior beyond the structured annotation and does not contradict it.

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 concise and front-loaded with the core purpose, followed by relevant pricing/access details. Every sentence contributes useful information, though the pricing detail could arguably be trimmed since it points to apis://prices.

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 tool with one optional, fully documented parameter and no output schema, the description covers purpose, content, access cost, and plan inclusion. It does not describe the response format, but the rubric contents are named, making it adequately complete for agent use.

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 description coverage is 100%, so the schema already fully documents the optional context parameter. The description adds nothing about parameters, but per the baseline for high schema coverage, no additional parameter explanation is required.

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 clearly identifies the resource (the rating rubric) and its contents: bands, facet weights, and trend thresholds, with the purpose of interpreting any rating score. It distinguishes this from sibling score-related tools like get_rating_history or get_provider_rating by focusing on the interpretation rubric rather than scores or history, though it does not name alternatives explicitly.

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 when to use the tool — when an agent needs to interpret a score against the rubric — but it does not state when not to use it or name alternative tools. The pricing and plan-inclusion information gives operational context but not explicit decision guidance versus siblings.

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