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

Annotations already declare readOnly/idempotent/non-destructive, yet the description adds substantial behavioral context: guide authority over external sources, no invented questions, a personal-data prohibition, disclaimer display, unvetted-additions labeling, and version-note handling. This is well beyond what the annotations convey.

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?

Purpose is front-loaded in one sentence, but the six-item rules block is long and policy-heavy for a simple read-only lookup, reading more like global agent instructions than tool-specific guidance. Content is largely non-redundant, but the density is high relative to the tool's simplicity.

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?

Covers what is returned (summary plus covered guide pages) and the constraints needed to use it safely; with no output schema and full schema coverage, little else is required. The only minor gap is that it never states how to obtain valid country/topic values other than referencing list_tests.

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 each parameter already documents its format and provenance (topic id from list_tests, two-letter country, language code). The description adds no further parameter-level detail, 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 and resource: 'short study summary of one topic of a country's official study guide, with the guide pages it covers.' This is clearly distinct from the question-oriented siblings (get_practice_questions, check_answer) and the discovery tool (list_tests).

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?

Gives strong framing guidance ('present it as a summary of the guide, not a substitute') and links inputs to list_tests, but never states explicitly when to choose this tool over get_practice_questions or the practice-link tool. Context is clear without naming exclusions.

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