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

The annotations already declare read-only, idempotent, non-destructive, and closed-world behavior. The description adds useful return-content context—entries include meaning, an example sentence, and a usage caution—but says nothing about limits, pagination, or result ordering, so it adds moderate value beyond the annotations.

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 two short sentences and is front-loaded with the tool's purpose. However, the second sentence is IELTS writing advice rather than tool-invocation guidance, so it does not fully earn its place in a tool definition.

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 and 0% schema description coverage, the description needs to carry more weight. It states what the tool returns but omits any explanation of the query, topic, or limit parameters, leaving an agent under-informed about how to invoke 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?

Schema description coverage is 0% and the description does not mention any of the three parameters: limit, query, or topic. It adds no meaning beyond the schema for how to filter, constrain, or interpret the inputs.

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 states a specific verb 'Search' and resource 'original IELTS vocabulary entries', and it lists the return content: meaning, example sentence, and usage caution. It does not explicitly differentiate from siblings such as search_practice or list_lessons, 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 gives no when-to-use or when-not-to-use guidance, and it never names an alternative tool. The second sentence is domain advice about using vocabulary correctly, not guidance for selecting this tool over search_practice or get_sample_answer.

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