get_timetable

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

With no annotations, the description carries full burden. It adds useful context by disclosing the data source (ODPT) and that it doesn't depend on Yahoo, but it doesn't explain behavior such as error handling, response format, or whether it covers real-time vs. scheduled times. This partial transparency is average.

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 one tight sentence with an informative emoji, front-loading the purpose and then the data source. Every phrase adds value (source, independence, directness) without padding, making it highly 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?

The tool is simple with 2 parameters, but there is no output schema, so the description should clarify return values. It mentions '時刻を提供' (provides times), which hints at the output, but lacks specifics on the structure (e.g., departure/arrival lists) or edge cases. This is sufficient but not complete.

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 baseline is 3. The description repeats '指定駅' (station_name) but doesn't add extra meaning about the railway parameter or provide examples. It adds no insight beyond the schema, so the score stays at baseline.

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 the tool searches for timetables of a specified station using ODPT data, with a specific verb (search) and resource (timetable) that distinguishes it from siblings like get_station_info or search_route. The mention of '指定駅' and 'ODPTデータ' provides precise scope.

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 gives clear context: use this tool when you need a station's timetable directly from ODPT data, as opposed to relying on Yahoo. It doesn't explicitly name alternatives or exclusions, but the purpose is unambiguous enough to guide selection among sibling tools.

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