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

Annotations already cover readOnly, idempotent, non-destructive and closed-world traits, so the bar is low. The description adds real value beyond them: the no-signup practice_url behavior and the graceful 'no guide published' fallback with a nearest practice scenario suggestion — non-obvious behavior an agent could not infer from the schema.

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?

Dense but front-loaded: it leads with the action and resource, then the return payload, then the fallback. Every clause conveys a distinct fact, though the run-on sentence structure makes it slightly heavy to parse.

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-param, read-only lookup with an output schema and full annotation coverage, the description supplies ample context — what it returns, the practice_url extra, and the empty-result path. Return-value detail is technically redundant given the output schema, but nothing an agent needs to call it correctly is missing.

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% with a single required param, so the schema already documents the input. The description reinforces the topic semantics ('a topic... the words the child used') and examples that parallel the schema description but adds no format or constraint detail beyond it; 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 ('Finds') plus the precise resource ('published Life Scenario "What to say" guide for parents') and enumerates the returned fields, so the agent knows exactly what it yields. It does not name the sibling find_practice_situation even though it clearly overlaps with it, so sibling differentiation is only implicit.

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?

It gives the input context (a child's situation topic, with examples) and describes the fallback when no guide is published, which implies usage. However, it never says when to prefer find_practice_situation over this tool or states an explicit precondition, so routing is left to inference.

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