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

Annotations already declare readOnlyHint=true, idempotentHint=true, non-destructive and non-open-world, so the safety profile is covered. The description adds that results are month-by-month and cover weather and wildlife seasons, which is useful domain context. It doesn't disclose pagination, response completeness, or error behavior, but with an output schema present that burden is reduced.

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 no waste. The key resource and scope (best time, weather, wildlife, month by month) are immediately clear.

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 read-only lookup with an output schema and 100% param coverage, the description is largely sufficient. It could add explicit routing to sibling tools or note how interest interacts with month, but nothing critical is missing for correct invocation.

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%, so the schema already documents destination, month, and interest with examples and semantics. The description adds little param-level detail beyond restating month-by-month behavior. Baseline 3 is appropriate when the schema does the heavy lifting.

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 (get) and resource (named destination's best time to visit, weather and wildlife seasons), and scopes it month by month. Among siblings like destination_events, destination_faq, destination_guide, it clearly carves out the seasonality/timing niche.

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?

Implies use when you want seasonal timing for a named destination, but gives no explicit when-to-use or when-not-to-use guidance, and doesn't route to alternatives like destination_overview or destination_guide. Usage is inferable but not stated.

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