load_timetable_index

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

With no annotations, the description carries full burden. It explains the action (download and index) and the cache behavior via force_refresh. However, it does not disclose potential side effects like network usage, duration, or whether it clears existing data. Minimal but acceptable for a simple initialization tool.

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?

Very concise: two sentences for purpose/usage and one line per parameter. No wasted words, front-loaded with the main action. Efficient and easy to parse.

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 (one optional parameter, no nested objects), the description covers the core purpose, usage context, and parameter semantics. It could mention potential time cost or that it prepares data for other tools, but the existing context (output schema exists) reduces the need for return value details.

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 coverage is 0%, so the description fully compensates. For the only parameter 'force_refresh', it explains exactly what true/false does ('re-download all data instead of using cache'), adding essential meaning beyond the schema's type and default.

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?

Description clearly states the tool downloads and indexes all accessible timetable datasets, with a specific verb and resource. It distinguishes itself from siblings by being a preparatory step, and the instruction 'Call this first if stop/route search tools return no results' further clarifies its unique role.

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?

Explicitly states when to use ('if stop/route search tools return no results') and implies it as a prerequisite. However, it does not explicitly state when not to use or mention alternatives, but the guidance is clear enough for the intended use case.

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