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

Annotations declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description then adds valuable behavioral context: the operation is a full replacement, not a partial patch, hence the instruction to send every content field back. It does not describe error cases or the response, but with annotations present the bar is lower.

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, front-loaded with the action and followed by the prerequisite workflow. No filler, no restatement of the title.

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 4-parameter mutation tool with a detailed nested content schema and no output schema, the description supplies the essential operational picture: it is a full replace that requires a prior read. It leaves the ID parameters and failure/return behavior unaddressed, but nothing critical to invoking it correctly 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?

Schema description coverage is 0%, so the description carries the burden for parameter meaning. It compensates partly by stating every content field must be supplied, which matches the nested object's required list, but the three ID parameters (projectId, siteId, assetId) get no explanation at all. Marginal value over the (self-documenting) nested schema.

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 ('Replace an article's editable content'), which clearly separates it from get_article and delete_article. It even names the read sibling in the workflow, though it does not explicitly distinguish itself from adjacent writes like regenerate_article_fields or update_article_improvement.

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?

Gives concrete workflow guidance: read with get_article first, then send every content field back. This establishes the read-modify-write pattern the agent must follow. It lacks explicit when-not-to-use or routing against other article-mutation siblings, keeping it short of a 5.

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