get_cheapest_travel_day

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

With no annotations provided, the description carries the full burden. It states the return value (day-by-day price breakdown) but does not disclose side effects, whether it is read-only, or any authentication requirements. The behavior is minimally transparent.

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 concise and well-structured, with a clear one-sentence purpose followed by labeled Args and Returns sections. Every part adds value without redundancy.

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 description covers the basic functionality and return type, but given the existence of sibling tools related to routes and transport, it lacks context on prerequisites (e.g., whether the route must exist) or error conditions. The output schema exists but is not shown, so the description adequately explains returns.

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?

Despite 0% schema description coverage, the description adds meaning to both parameters: 'Origin city slug' and 'Destination city slug' with examples (e.g., 'rome', 'milan', 'florence'). This helps the agent understand the expected format and provides value beyond the schema titles.

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's purpose: to find the cheapest day of the week for travel between two Italian cities. The verb 'Find' and specific resource 'cheapest day of the week to travel' are distinct from sibling tools like 'get_route_info' and 'list_italy_routes', which focus on routes and transport options respectively.

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 implies usage through its purpose, but it does not explicitly state when to use this tool versus alternatives. No guidance on prerequisites, limitations (e.g., only Italian cities), or when to choose another tool is provided. The sibling tools exist but are not mentioned.

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