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

Annotations declare destructiveHint=true and idempotentHint=false, so the description needs only to add surrounding context — but it adds none. Critically, it never says whether the 'body' fields are replaced wholesale or merged as a partial update, which is the single most important behavioral fact for a destructive non-idempotent mutation; nor does it mention permissions or whether omitted fields are cleared.

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?

Both sentences express the identical proposition, so the second earns nothing. Brevity here is a product of under-specification rather than efficient front-loading.

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?

This is a destructive, non-idempotent mutation on a nested-object schema with no output schema and no annotations beyond hints. The description omits update semantics, required permissions, the ID-type ambiguity, and project scoping — all of which an agent needs to call it correctly.

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 reported as 0%, so the description must carry the load and it does not: it never explains the dual ID semantics (external ID vs moderation API ID), the projectId scoping rules, or the optional author body fields. The nested schema happens to document individual fields, but the description's role in disambiguating the envelope parameters is unfilled.

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 two sentences restate the tool name ('Update author details' / 'Update the details of a specific author') without adding a specific verb-resource scope. It never distinguishes itself from the many sibling author tools (authors-block, authors-suspend, authors-delete, authors-create), so an agent learns nothing about what 'details' means or how this differs.

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 guidance on when to use this versus alternatives such as authors-create for new authors or authors-block/authors-suspend for status changes. The agent must infer from the name alone that this is the general-purpose edit path.

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