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

Annotations already declare readOnlyHint, openWorldHint, and destructiveHint false, so the safety profile is covered. The description adds useful context about the NDC-adjusted API and the unusual charter-flight inventory, but it does not describe result format, availability behavior, or rate limits.

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 sentences, each carrying information: what the API searches, what data source it draws on, and what the user gets. It is slightly redundant with the title, but it remains compact and front-loaded.

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 17-parameter tool with no output schema and no required parameters, the description does not clarify which parameters must be combined to produce a valid flight search (e.g., orig, dest, and dates). It gives good market context but leaves invocation logic to the schema.

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 schema already documents all 17 parameters and defaults. The description only says results are 'based on search criteria' and adds no meaning beyond what the schema provides; baseline 3 is appropriate.

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 concrete action and resource: 'söka efter flygresor (endast flyg) tillgängliga från Sverige' [search for flights only available from Sweden]. The explicit '(endast flyg)' and the Sweden scope distinguish it from the sibling search_holidays and from general metasearch engines.

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?

It provides clear context: this is for flight-only charter inventory that is usually absent from Google Flights, Skyscanner, or Kayak. It does not name the sibling alternative or give an explicit when-not-to-use statement, but '(endast flyg)' plus the search_holidays sibling make the intended use reasonably clear.

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