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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), and the description still adds real behavioral facts: results are capped at 25 unique UUIDs, supplied order is preserved without reranking, and one missing record fails the entire request. It also scopes out adjacent actions ('does not save a list, verify suitability, or make a booking'), preventing misuse.

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?

Four tight sentences, each carrying distinct information: purpose, parameter semantics, ordering behavior, failure mode, and exclusions. The scoping constraint is front-loaded and nothing is repeated from the schema or annotations.

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?

An output schema exists, so return values need not be explained, and the description covers the input, ordering, and failure semantics well. The one soft spot is what 'open' actually means operationally for a read-only, non-open-world tool, which an agent may still wonder about, though it does not block correct invocation.

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 0%, so the description must carry the semantics and it does: the array must contain unique UUIDs, is capped at 25, and the omit-vs-empty-array distinction is spelled out with the precondition for []. It also discloses that ordering is meaningful and preserved, which the schema cannot express.

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 states a specific verb and resource ('Open provider exploration with current records') and bounds the input ('up to 25 unique UUIDs returned by discovery'), which is enough to tell it apart from a single-provider fetch or a search. It never names the sibling tools (search_providers, get_provider) explicitly, so routing is inferred from 'discovery' rather than stated, keeping it short of a 5.

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?

Clear conditions are given for the optional parameter: omit provider_ids to start with no results, pass [] only after a successful search with no matches. That is precise when-to-use guidance for the only input. What is missing is an explicit steer to a different sibling (e.g. get_provider) when a single record is wanted.

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