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

Annotations already declare readOnlyHint=true, idempotentHint=true, and openWorldHint=false, so the safety profile is covered. The description adds useful context beyond annotations: no API key is needed, the listed pairs are bookable, and the returned language_pair_id is consumed by other tools. It does not cover pagination or full return shape, but the read-only list behavior is sufficiently clear.

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 short sentences, front-loaded with the key fact that no key is needed and the tool lists bookable language pairs. Every sentence contributes purpose, downstream usage, or filtering guidance.

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 simple read-only list tool with two optional parameters, full schema coverage, and clear annotations, the description covers the essential context: authentication, resource, returned identifier, filtering, and downstream consumers. No output schema exists, but the key returned field is described.

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 both the lang locale parameter and language_id are already documented in the schema. The description adds that language_id should come from tolk2go_interpreting_list_languages and that filtering keeps the list short, but it does not add information about the lang parameter beyond the schema.

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 uses a specific verb and resource: it lists bookable language pairs and explicitly returns the language_pair_id. It also distinguishes the resource from sibling list_languages by referring to language pairs and their downstream use in availability search and create_booking.

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 states the tool's role in the workflow: the returned language_pair_id is needed by availability search and create_booking. It also tells the agent to filter using a language_id from tolk2go_interpreting_list_languages to keep the list short, though it does not explicitly state when not to use this tool.

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