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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description adds genuinely new context: the authorization scoping ('exact authorized terms'), the credential model (offer-link token vs. token of a request linked to the offer), and a full inventory of the data surfaced. It stops short of a 5 by omitting what happens when the token is invalid or the request is not linked to the offer.

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?

The main purpose is front-loaded and the parenthetical groupings (counteroffers, purchasing, fulfilment) keep a dense enumeration readable. The single long sentence is heavy on dotted field paths, but each listed item maps to real returned content rather than filler. Slightly tighter phrasing would make it easier to scan.

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?

With no output schema, the description carries the burden of describing returns and does so thoroughly across terms, order state, payment links and three thread sections. Credentials and authorization scope are covered. Remaining gaps are error/failure behavior for invalid or mismatched credentials, which matter for a token-gated read.

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 id and token are already documented in the schema. The description reinforces the credential meaning of token ('offer link credentials, or credentials of the request explicitly linked to this offer'), which is a modest addition over the schema's 'private token from your receipt'. No format or linkage constraints are added beyond that, so the 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?

The description opens with a specific verb and resource ('Read the exact authorized terms, terms hash, order state and processor payment links') and then enumerates the thread sub-objects it returns (thread.counteroffers, thread.purchasing, thread.fulfilment). This clearly separates it from request_status and describe_business. It falls short of a 5 because it never names the closely related siblings (inspect_delivery, answer_remedy) even though thread.fulfilment overlaps with their territory.

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?

Usage is only implied: an agent can infer this is the read path for a specific offer, and the final sentence gives a credential prerequisite ('Use the offer link credentials, or credentials of the request explicitly linked to this offer'). There is no explicit when-to-use/when-not-to-use guidance and no routing to alternatives such as request_status for lightweight status checks or inspect_delivery for delivery-only views.

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