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

The annotations already declare readOnlyHint=true and openWorldHint=true, so the safety and access profile is covered. The description adds useful content scope by listing profile fields and recent articles, but it does not disclose pagination, freshness, rate limits, or other behavioral traits beyond what the annotations provide.

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 definition is a single front-loaded sentence that efficiently lists the profile contents and the required URL source. Every phrase contributes to understanding what the tool returns and how it is invoked.

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?

Given one fully documented input parameter, existing annotations, and an output schema, the description is complete enough. It covers the input source and the scope of returned data without needing to restate return schema details.

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 there is one required parameter, so the schema already documents the canonical author URL. The description reinforces that the URL must be canonical but adds no syntax, format, or validation details beyond the schema.

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 identifies a specific resource, a Globe and Mail reporter's public profile, and lists the returned contents including name, job title, location, biography, headshot, contact/social links, and recent articles. It is clear enough to distinguish from article/headline/news siblings, but it does not explicitly name or rule out those alternatives.

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 phrase 'from a canonical author URL' implies the tool should be used when an agent already has a canonical Globe and Mail author URL. However, it gives no explicit when-to-use guidance, no when-not-to-use guidance, and no named alternatives for other author-related retrieval scenarios.

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