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

Annotations declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds that the profile is public and enumerates the return fields, but it doesn't cover auth requirements, request limits, or what happens if the author is missing. With annotations carrying the heavy lifting, a 3 is appropriate.

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?

One sentence, front-loaded with the resource, zero waste. Efficient and clear.

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?

An output schema exists, so return values needn't be explained. For a simple read-only profile fetch, the description plus annotations are largely sufficient. The only gaps are the URL format and failure behavior, which are minor against a complete structured schema.

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?

The single required 'url' parameter has zero schema description coverage. The description doesn't specify the expected URL format (e.g., globalnews.ca/author/slug), whether it must be an author page URL, or any validation rules. With one undocumented parameter, the description fails to compensate for the schema gap.

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+resource: retrieving a Global News author's public profile, and enumerates the fields returned. It distinguishes itself from the sibling article tool (globalnews_article) by focusing on the author, though it doesn't explicitly differentiate from other author-profile tools in the same family (none exist for Global News). Clear but lacks explicit sibling differentiation.

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?

Usage is implied: you call it when you have an author URL. There is no explicit guidance on when to use this versus globalnews_article or other sources, no prerequisites, and no exclusions. Minimum viable, with clear gaps in routing guidance.

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