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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered. The description adds real value by characterizing the output shape ('with examples and a memory tip') for a tool with no output schema. Beyond that it says nothing about length limits, error behavior for unknown topics, or language of the response, and it does not contradict 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?

Two sentences, front-loaded with the core purpose and level before the topic enumeration. The long topic list is dense but earns its place by defining scope and doubling as a discovery hint; the no-topic fallback is stated last, which is the one slightly buried detail.

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 single optional parameter, zero-required, read-only lookup tool, the definition covers level (A2), content (examples plus memory tip), and the no-argument behavior, which is everything needed to invoke it correctly. The only gap is that topics are referenced as 'the list' without describing its format, which the agent must discover by calling without a topic.

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% and the schema already states that topic accepts 'a topic id from the list, or a few words like "de or het" or "word order"'. The description's topic list reinforces that but adds no syntax or matching behavior beyond the schema, 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?

The description uses a concrete verb+resource ('Short Dutch grammar lessons at A2 level') and enumerates the exact topic coverage (de/het, plurals, word order, negation, modal and separable verbs, etc.), so an agent knows precisely what this returns. It does not explicitly contrast itself with siblings like practice or inburgering_help, but the topic enumeration makes the distinction obvious in practice.

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?

'Without a topic: the list' establishes a clear two-step usage pattern — call with no topic to discover available topics, then call again with a topic id. It does not state when to prefer this over practice or knm_facts, so an explicit alternative rule is missing, but the invocation context is unambiguous.

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