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

Annotations indicate readOnlyHint=true and destructiveHint=false. The description adds significant behavioral context: rankings cover products launched in the period, ordered purely by community vote (no paid placement), weeks are ISO weeks anchored to America/Los_Angeles, and date parameter behavior. No contradictions.

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 description is a single paragraph with no fluff, front-loading the main purpose. It could be slightly more concise but is well-structured and efficient.

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?

Given 3 parameters and no output schema, the description covers key behavioral aspects: ranking criteria, timezone handling, date semantics. Missing details about pagination or default limit behavior, but overall complete enough for an agent to use 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 has 3 parameters with 33% description coverage. The description explains the semantics of period (enum of time ranges), date (gets period containing the date, omit for current), and limit (default 20, implicitly). This adds value beyond the schema, though limit is not explicitly described.

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 clearly states it returns community-voted rankings for a period, specifying when to use it ('trending, popular or winning on uneed.best'). It distinguishes itself from sibling tools by describing the unique ranking mechanism and community voting aspect.

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?

The description explicitly says 'Use this when the user asks what is trending, popular or winning on uneed.best.' It provides clear context for when to use the tool, though it does not mention when not to use it or list alternative tools.

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