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

readOnlyHint=true and openWorldHint=true already tell the agent this is a safe, open-world read, so the bar is lower. The description adds that input must be a canonical author URL and hints at the payload, but it adds no auth, rate-limit, or data-freshness context beyond annotations, and the shape of the return is already covered by the output 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?

Two sentences with zero filler. The core action and returned fields come first, and the sibling routing is a compact second sentence.

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 required parameter, full schema coverage, a declared output schema, and read-only open-world annotations, the description is nearly complete. The only omission is how to recognize or obtain a canonical author URL versus an article URL, which would help an agent avoid calling it with the wrong identifier.

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 sole parameter is documented as 'Canonical India Today author URL'. The description's phrase 'from canonical author `url`' largely restates that, adding no format example or guidance on where to obtain the canonical URL. Baseline 3 is appropriate.

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 (Fetch) plus resource (India Today author profile) and enumerates the returned content: job title, headshot, biography, recent stories. It also names the sibling indiatoday_article as the tool for a single story, so an agent can distinguish it from the article/headlines/news/sections siblings without opening a schema.

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?

Explicitly routes the agent: use this for an author's profile, use indiatoday_article for one story. That is a clear when-to-use condition and a named alternative. It stops short of stating exclusions or prerequisites (e.g., that the URL must be a canonical profile page rather than an article byline URL), so not a full 5.

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