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

Annotations already declare readOnlyHint=true, openWorldHint=false and destructiveHint=false, so the safety profile is covered. The description adds that results include 'historical data and analysis,' which hints at payload depth, but says nothing about behavior on unknown IDs, permission requirements, or the shape/size of the response — and idempotentHint=false on a read tool goes unremarked.

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, front-loaded with the core action; nothing extraneous. The second sentence is largely an elaboration of the first and repeats the title, a minor redundancy rather than a flaw.

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-parameter read tool with annotations and no output schema, the definition covers the essential purpose. Gaps remain: the description does not explain what 'historical data and analysis' concretely contains, nor the project-scoping rule that the nested schema imposes, leaving the agent dependent on schema prose alone.

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% at the top level, and the description never mentions the id or projectId parameters. However, the nested schema itself carries substantive prose for both fields (external vs. moderation-assigned ID, project scoping rules), so the parameter burden is largely carried by structured data rather than the description.

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 ('Get author details' / 'detailed information about a specific author'), making single-record retrieval unambiguous. It does not explicitly distinguish itself from authors-list or analytics-authors, so the agent must infer the singular-vs-list split from the word 'specific'.

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: an agent can infer this is the tool for fetching one author once it already has an ID, versus authors-list for enumeration. There is no explicit when-to-use, when-not-to-use, or named alternative, and the choice between authors-retrieve and analytics-authors for author-level stats is left unaddressed.

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