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

With no annotations, the description carries the full burden. It discloses an important precondition (must call get_dispatch_context_and_time first) and warns against guessing dates, which is valuable. However, it does not describe the return shape, failure behavior, or confirm the operation is read-only.

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 short and front-loaded with the core purpose, followed by a required prerequisite and a usage note. The all-caps warnings are attention-grabbing but not wasteful; every sentence 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?

For a 5-parameter tool with no output schema and no annotations, the description gives the key prerequisite and a clear usage scenario but omits what the returned slots look like or how results should be interpreted. It is adequate for invocation but incomplete on output expectations.

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 100%, so the baseline is 3. The description reinforces that dates must come from context and that validityToken originates from get_dispatch_context_and_time, but those facts are already in the schema. It adds no new detail for aircraftId or durationHours.

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 opens with 'Find free flight slots,' a clear verb+resource statement that tells an agent the tool locates open time windows. It does not explicitly differentiate from siblings like get_aircraft_availability, so it stops short of a 5, but the core purpose is unambiguous.

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 gives explicit usage context: call get_dispatch_context_and_time first, and use this tool when a user asks to fly in order to find and suggest a gap. It does not state when not to use it or name alternative tools, so it lacks full exclusion guidance.

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