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

No annotations are provided, so the description carries the full behavioral burden for a 33-parameter mutation, and it discloses almost nothing. It does not say whether the update is a merge/partial patch (only implied by "fields"), whether omitted fields are preserved, what permissions are required, or whether edits are reversible. For a write tool with zero annotation coverage this is a substantial gap.

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 front-loaded sentence with zero filler — the verb and resource come first. It is efficient, though the brevity here reflects under-specification rather than disciplined conciseness.

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 33-parameter mutation with no annotations, no output schema, and 27% schema coverage, this one-liner is far too thin. Nothing addresses partial-update semantics, enum-governed interactions (e.g. status/scheduled_for), or the many parameter relationships an agent must respect.

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 only 27% across 33 parameters, so the description is required to compensate and it adds no parameter meaning whatsoever. It never clarifies that only supplied fields change, nor explains the many undocumented fields (slug, tags, keywords, primary_category) that the schema also leaves bare.

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 uses a specific verb+resource ("Update fields on an existing article") and implies partial rather than full replacement, so the purpose is immediately legible. However, it does nothing to distinguish itself from close siblings such as Update_Collection, Update_SEO_Fields, or Write_Article, 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?

There is no when-to-use guidance, no mention of when to prefer Write_Article (create) or Update_SEO_Fields, and no prerequisites such as the article needing to exist. The agent is left to infer routing entirely from the name.

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