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

The annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false. Beyond that, the description adds useful behavioral context by saying the result is a readable document/prose containing a defined set of record sections, which helps the agent understand the output shape before invoking it.

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?

The definition is two tightly written sentences. The primary action and record contents are front-loaded, followed immediately by the routing guidance to specialized alternatives.

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?

With an output schema, one fully documented required parameter, and rich annotations, the description provides enough context to select and invoke the tool correctly. It also helpfully characterizes the response as a readable prose document rather than structured sections.

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%, and the single `id` parameter is already documented in the schema as coming from a `search` result. The description repeats that same guidance rather than adding new syntax, format, or validation details, so baseline 3 is appropriate.

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 states a specific verb and resource: retrieve the full Chrome-Stats record for one extension or app. It also enumerates the record contents and explicitly distinguishes this prose-oriented fetch from the narrower structured siblings.

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?

It explains that the id comes from `search` and gives an explicit alternative rule: use get_extension, get_trends, get_reviews, or get_ranking when a single section is needed as structured data rather than prose. That is clear when-to-use and when-not-to-use guidance.

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