hub_check

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

With no annotations, the description carries the full burden. It discloses the tool's behavior: checks connections, identifies dead legs, suggests fixes, and shows carrier combos. It does not mention permissions or side effects, but the behavior is sufficiently transparent for a read-like analysis tool.

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 concise with three sentences: first states purpose, then lists capabilities, then gives use cases. It is front-loaded and contains no redundant or irrelevant information.

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 complexity and absence of output schema, the description covers purpose and usage well. It explains what the tool does and when to use it, but lacks explicit information about output format or return values, which could be inferred from the described behaviors.

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?

Input schema has 100% coverage with descriptions for each parameter. The description adds context about alliance fares but does not elaborate on parameters beyond what the schema provides. Baseline score of 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 clearly states the tool checks the best connection between two airports and lists specific capabilities like identifying dead legs and suggesting hub routing fixes. It also distinguishes from siblings by focusing on hub routing and alliance fares, making it essential for specific routing contexts.

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 provides clear context on when to use the tool, citing transpacific, kangaroo, and intra-Asia routing. However, it does not explicitly state when not to use it or compare with sibling tools, missing an opportunity to guide selection.

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