get_tour_calendar

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

With no annotations, the description carries the full burden. It discloses that the tool performs a fetch and returns a JSON string with a specific content structure, which is useful. However, it does not explicitly state whether this is a read-only operation, potential side effects, or any authentication/rate-limit requirements. Given the name and 'Fetch', it is likely safe, but not explicitly confirmed.

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 two sentences, front-loaded with the action and resource, and each sentence contributes relevant information. No redundant or filler content.

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 the tool's simplicity, the existence of an output schema, and complete parameter descriptions in the schema, the description adequately covers the tool's purpose and behavior. It even mentions the return type and contents, which adds completeness beyond what the schema provides.

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?

All parameters (year, month, travel_type) have descriptions in the schema, covering 100% of them. The description adds no additional semantic meaning beyond saying 'for a given year and month', which is already in the schema. This meets the baseline for complete schema coverage.

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 uses a specific verb ('Fetch') and identifies the resource ('monthly departure calendar and tour schedule matrix') and the website (www.maitabi.jp). It clearly distinguishes itself from sibling tools like search_tours or get_tour_detail by focusing on the calendar/matrix for a given year and month.

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 makes it clear that the tool is for retrieving a calendar for a specific year/month, implying when to use it. However, it does not explicitly state when not to use it or mention alternatives among the sibling tools, so no clear exclusion or alternative guidance is provided.

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