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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so safety is covered. The description adds genuinely useful behavioral context beyond annotations: the response is only a public preview in Arabic and English, and full content requires signing in on the website. It does not cover behavior for missing, unpublished, or private article ids, which keeps it from a 5.

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 short sentences with the core operation front-loaded and the access limitation immediately following. No filler or repetition.

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?

With no output schema, the description carries the burden of explaining returns and does so at a high level: a public preview in Arabic and English plus metadata. For a single-parameter read tool this is largely sufficient, though it leaves the exact response shape vague.

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 the single 'id' parameter already has a clear description including where to source it. The description reinforces that the id is numeric and refers to a published article, but adds no further syntax or constraint details beyond the schema. 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 and resource ('Fetch one published article by numeric id') and immediately scopes what is returned ('public preview in Arabic and English plus metadata'). The word 'one' and the id-based lookup clearly distinguish it from list-style siblings like list_recent_articles and search_archive.

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 description implies usage when you have a numeric article id, and the sign-in note clarifies a limitation, but it never states when to prefer this tool over siblings or what to do if you lack an id. Alternatives such as list_recent_articles or search_archive are mentioned only in the parameter schema, not in the description itself.

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