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

Annotations already cover readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is clear. The description goes beyond this by revealing the response shape (flights[] array) and that one flight ident can map to several dated flights, which is a non-trivial behavioral nuance. No contradictions with annotations.

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 two sentences plus one inline example, front-loading the core purpose and adding only relevant detail about the array response. There is no filler or redundancy; every word serves a purpose.

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 moderate complexity (5 params, no output schema) and with all parameters fully described in the schema, the description covers the main purpose, the response array, and usage example. It does not address pagination or error behavior, but for a read-only flight status lookup the missing pieces are minor.

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 baseline is 3. The description's example call ({ ident, _apiKey }) illustrates basic usage but adds no semantics beyond what the schema already states (e.g., ident type, start/end bounds, ident_type inference). The example is mildly helpful but not compensating for any gap.

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 identifies the tool's verb and resource ('Get real-time flight status') and enumerates the data fields it returns (airports, times, status, aircraft type). It does not explicitly differentiate from sibling tools like flightaware_flight_position or flightaware_flight_track, but the scope is specific enough that it is unlikely to be confused.

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 alternative guidance is provided; the description simply says what the tool does. It does not mention sibling tools or conditions for choosing this tool over flightaware_flight_position or flightaware_flight_track, leaving the agent without a decision matrix.

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