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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The word 'public' usefully signals no authentication is needed and 'readable body paragraphs' hints at the extraction shape, but no rate-limit, failure, or paywall/blocking behavior is disclosed.

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 semicolon-linked sentence with no filler, front-loading the extracted content before the URL constraint. Every clause earns its place.

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 and annotations cover the read-only/open-world profile, so return values and safety need not be explained. For a single-URL extractor the definition is close to complete; only the routing guidance against the headline/news siblings 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?

With one parameter at 100% schema description coverage, the schema already documents 'url'. The description adds the qualifier 'canonical dated story URL', which gives useful meaning (must be a canonical article permalink, not a section or search URL), but adds no format or validation detail beyond that.

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 ('Extract') and resource ('Malay Mail article metadata and readable body paragraphs'), which is enough to distinguish it from the feed-style siblings malaymail_headlines/news/sections. It does not explicitly name those siblings, so it stops short of a 5.

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 required 'url' plus 'canonical dated story URL' implies this tool operates on a single known article rather than browsing, but there is no explicit when-to-use statement or pointer to malaymail_headlines/malaymail_news as the discovery alternatives. Usage is implied, not stated.

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