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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so 'Read-only' in the description is redundant. The description does add value beyond annotations by disclosing the default result ordering (soonest expiry first) and the fields present in each row, but it says nothing about pagination or what an empty result means.

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 core purpose and followed by the return shape. Nearly every clause earns its place; only the trailing 'Read-only' restates what annotations already declare.

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 three-parameter, zero-coverage, no-output-schema tool, the description does well to enumerate returned row fields. The remaining gaps are the undocumented limit/pagination behavior and no guidance on how to expand or narrow results when the default cap is hit.

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 burden. It explains the semantics of token filtering and of kind ('call or put'), covering two of three parameters, but the 'limit' parameter (default 10, max 50) and its paging behavior are never mentioned, and the token format constraint is left entirely to the schema pattern.

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 gives a concrete verb and resource: it lists purchasable open option offers, with filters and a defined sort order ('soonest expiry first'). This clearly separates it from singular lookups like get_offer and from compare_offers, though it never names an alternative explicitly.

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?

'Open option offers you can buy right now' implies a pre-purchase discovery use case, which is useful context. However, there is no explicit when-to-use versus when-to-use-something-else guidance (e.g., compare_offers for side-by-side evaluation, get_offer for a single detailed offer by id).

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