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

No annotations are supplied, so the description carries the full burden. It usefully discloses two non-obvious behaviors: results are 'retained' (server-side persistence) and retrying issues 'no additional payment', which tells the agent this read is not billed. It says nothing about expiry windows, what the returned payload contains, or how signature verification failures manifest.

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?

Two sentences, front-loaded with the action and credential, then the recovery path. Every clause carries information; nothing is restated from the schema or title.

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 read tool with three crypto-credential parameters, no annotations and no output schema, the description covers the happy path and the retry path but omits the failure surface (expired or unretained results, invalid signature handling) and any hint of the returned result's shape. The gaps are real but narrow, since a read tool does not need mutation warnings.

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% across three required parameters, so the description must compensate. It loosely maps all three (ticket, challenge, signature) by naming 'retained ticket result' and 'signed result challenge', but adds no format detail, no explanation of how the signature binds to ticketId and challengeId, and no note that the signature is an ECDSA hex blob.

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 and resource ('Retrieve a retained ticket result') plus the credential required ('buyer's signed result challenge'), which distinguishes it from the write-side sibling submit_work_ticket_result and from create_work_result_challenge. It stops short of naming those siblings explicitly, so differentiation is inferred rather than stated.

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?

Gives a concrete conditional path: if the response is interrupted, mint a fresh challenge via the challenge-creation sibling and retry. That is genuine when-to-use guidance with an alternative. It does not cover other decision points, e.g. when to prefer get_work_ticket_status or what to do if the result is no longer retained.

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