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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds genuine value by disclosing that related entities (authors, assignees, tags, collection) are expanded in the response, but it says nothing about error behavior or whether missing relations appear as empty fields.

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?

One front-loaded sentence with no filler: the action, the keying parameter, and the contents of the result all appear immediately. Nothing could be removed without losing information.

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?

For a single-record read with a documented parameter, an output schema, and full annotation coverage, the description supplies what an agent needs to select and call it. The only modest gap is the absence of any guidance on the list/search-to-fetch workflow or failure modes.

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% — the single article_id parameter is documented as an integer sourced from list_articles. The description restates the ID concept without adding format, range, or retrieval guidance beyond what the schema already provides, so the baseline of 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?

The description gives a specific verb and resource ('Get an article') and scopes it to a single-record fetch 'by ID', which distinguishes it from list_articles and search_articles among the siblings. It stops short of naming those alternatives explicitly, so it is clear but not maximally differentiated.

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?

Usage is only implied: 'by ID' plus the schema note '(from list_articles)' suggests you must already have an ID, which hints at the list/search-then-fetch workflow. There is no explicit statement of when to choose this over search_articles or list_articles, and no note about what happens with an invalid or unknown ID.

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