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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered by structured data. The description adds nothing beyond that – not how activities map to days, how the day count is used, or what happens if activities outnumber days.

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?

Three words is not conciseness but under-specification; there is no front-loaded statement of action, input, or result to anchor an agent.

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 three-parameter transformation tool with no output schema and two undocumented required parameters, the description provides none of the information an agent needs to invoke it correctly or predict its result.

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 33%: only startDate carries a description. The two required parameters, days and activities, are documented nowhere – the description never explains that activities are distributed across the supplied number of days, nor any constraint or ordering. With low coverage the description must compensate and it does not.

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?

"Travel itinerary splitter" gestures at the resource (a travel itinerary) but the verb "splitter" is ambiguous – it never says whether activities are distributed across days, truncated, or grouped. An agent cannot tell what output shape to expect or how this differs from planning_packing_list or planning_travel_countdown.

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?

There is no when-to-use guidance, no prerequisites, and no mention of the sibling planning tools that might be the better choice. The only signal is the name itself, which is inference rather than instruction.

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