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

Annotations already declare readOnlyHint=true and openWorldHint=true, covering the safety and network profile. The description adds modest context: 'public' (no auth), 'readable body paragraphs' (cleaned text rather than raw HTML), and a canonical URL. It does not disclose rate limits, paywall behavior, or failures.

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 compact sentence with the verb front-loaded and no filler. The second clause about the canonical URL is slightly confusing in context but the definition wastes no 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?

An output schema exists, so return values need not be described, and annotations cover safety. For a one-parameter extraction tool the description is adequate, but it leaves the input url unexplained and offers no routing guidance relative to its news/headlines siblings.

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 0% for the single required 'url' parameter, so the description should compensate but does not explain what the url should point to or how it is consumed. Worse, 'provide a canonical dated story URL' reads as an output claim and is ambiguous against the required input url.

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 distinguishes it from the malaymail_headlines/news/sections siblings that only list rather than extract. The scope is clear even without naming a sibling explicitly.

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 singular 'article' plus 'body paragraphs' implies this is for pulling one full story rather than a list, so usage is inferable. However, it gives no explicit when-to-use statement or pointer to how it relates to malaymail_headlines or malaymail_news.

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