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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the description is not carrying the safety burden. It adds useful behavioral context by enumerating the returned content (biography, headshot, recent articles), which tells the agent what to expect beyond 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?

A single sentence that front-loads the verb and resource, then lists the payload. No wasted words.

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?

One required parameter, an output schema that covers return structure, and annotations that cover safety all mean the description needs only to state scope and the expected payload, which it does completely.

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 there is only one parameter whose schema description ('Canonical Irish Times author URL') is more precise than the description's mention of a 'canonical author URL'. The description adds no format details beyond the schema, so 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 (Returns) and resource (an Irish Times author's profile) and enumerates the exact fields returned (name, job title, biography, headshot, contact details, recent articles). The Irish Times prefix distinguishes it from the many other *_author siblings.

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' tells the agent the precondition for calling it, which is a genuine usage constraint. However, it doesn't name alternatives (e.g., irishtimes_article for articles by the same author) or state when not to use it.

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