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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and a closed-world scope, so the safety profile is covered. The description adds the return payload shape (practice sets with size, free questions, price), which is useful context, but says nothing about empty-result behavior or how many matches come back by default.

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 tight sentences with the matching criteria front-loaded and examples embedded inline rather than as a list. The closing sentence restates return fields that the output schema already declares, which is the only wasted weight.

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 two-parameter read tool with full annotation coverage and an output schema, the description supplies what structured fields cannot: the three matching modes. The only real gap is the undocumented limit parameter and unspecified default result count.

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%, so the description must carry the parameter burden. It does a good job on query by enumerating code/name/topic matching with concrete examples, but the limit parameter is never mentioned — no default, no maximum, no effect on result count — leaving half the surface undocumented.

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?

Specific verb ("Find") plus a concrete resource ("certification exams") with three example query forms that make the matching semantics unambiguous. It does not differentiate itself from the sibling list_exams, so an agent must still infer which of the two is the browsable-listing tool.

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 examples of acceptable query inputs imply when this tool applies (you have a code, name, or topic in hand), but there is no explicit when-not guidance and no routing to list_exams or get_exam_details. Usage is inferable rather than stated.

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