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

No annotations are provided, so the description carries the full behavioral burden. 'Re-read' implies a non-mutating fetch and it discloses the returned fields including 'expiry', hinting that offers can lapse, but it says nothing about behavior for expired/missing offers, auth requirements, or rate limits.

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?

A single front-loaded sentence with the verb and lookup key first, followed by the field list. Every clause earns its place with no filler.

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?

There is no output schema, so the description usefully enumerates the return fields (merchant, product, agent price, shipping, landed price, terms, expiry). For a simple one-param read tool this is nearly complete; only edge-case behavior for expired or missing offers is absent.

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 schema already documents the single offerId parameter including its origin ('from search_products'). The description's 'by id' adds no meaning beyond that, so the baseline 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?

States a specific verb+resource ('Re-read an offer by id') and enumerates the returned fields, so an agent knows this is an id-based retrieval of an existing offer rather than a search or mutation. It does not explicitly name a sibling, so it falls 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?

The word 'Re-read' implies fetching an offer previously surfaced (the id origin lives in the schema, 'Offer id from search_products'), which hints at usage. However there is no explicit when-to-use/when-not guidance or mention of alternatives like search_products or extend_offer.

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