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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and openWorldHint=false, so safety is covered. The description adds useful context beyond them: the data is a 'live' offer, implying dynamic pricing/freshness rather than a cached static list, which matters for a pricing tool. It does not mention output shape, but an output schema exists.

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?

Front-loads the identity of the tool before the inventory of returned fields, and every clause is an informative item rather than filler. The long semicolon list makes it dense but not padded.

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 one-parameter read tool with rich annotations and an output schema, the description covers identity, scope, returned content, and workflow placement. An agent has everything needed to call it correctly and to know when to prefer it over its siblings.

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% and the single enum parameter already documents tbs-evn/evn-tbs and the both-directions default. The description reinforces 'per direction' departure times but adds no syntax or semantics beyond the schema, so baseline 3 applies.

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?

Names a specific resource set (live GeoArm Taxi offer for the Tbilisi–Yerevan route) and enumerates exactly what is returned: currencies, per-car-type seats and prices, departure points with ids, departure times per direction, and key facts. An agent can distinguish this read-only pricing tool from create_booking and get_booking_status without opening the schema.

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?

Explicitly routes the agent: 'Read it before create_booking,' which names the sibling and the sequencing condition. It does not state when not to call it or how it differs from get_booking_status, so it falls just short of full when/when-not guidance.

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