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

Annotations already indicate read-only, non-destructive behavior, so the description does not need to restate that. It adds useful context: API key required, a $0.10 cost, and restriction to completed trips. It does not explain canonicalization behavior or result shape, but the output schema covers returns.

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 extremely compact, front-loads the purpose, and adds only high-value operational notes (cost and API key). No filler or redundant restatement of the tool name exists.

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 output schema exists, so return value documentation is not needed. However, with 0% parameter coverage, no usage guidance, and no explanation of 'to'/'from', the description is not complete enough for an agent to invoke the tool correctly in all cases.

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 0%, and the 'to' and 'from' parameters have no descriptions. The description does not clarify whether these are dates, place identifiers, or some other range, so an agent cannot reliably determine parameter format or meaning.

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 names a specific resource ('canonical cities') and the source domain ('completed trips'), and the tool name reinforces the action. It does not explicitly contrast with siblings like get_countries_visited or get_travel_history, but the core purpose is understandable.

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?

No when-to-use guidance is provided, and no alternative tools are mentioned. The phrase 'from completed trips' implies a filter condition, but it does not explain when an agent should prefer this tool over get_countries_visited, get_place_visits, or get_travel_history.

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