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

Annotations already declare readOnly, idempotent and non-destructive, so the safety profile is covered. The description adds value beyond them by disclosing the SuperAdmin AI key authorization requirement and the semantics of the listingActive filter (live vs hidden vs omitted). It does not discuss pagination behavior beyond what the limit parameter implies, so it falls just short of a 5.

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 clauses, front-loaded with the resource definition, then prerequisites, then the sibling exclusion. No sentence is redundant and nothing is buried.

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-only list tool with a fully documented 3-parameter schema and annotations covering the safety profile, the description supplies the remaining essentials: what counts as a vendor here, who may call it, and how it differs from the related tools. Nothing an agent needs to invoke it correctly is missing.

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 all three parameters (limit, farmId, listingActive) are already documented in the schema, including ranges and defaults. The description only restates the listingActive filter at a high level, adding no syntax or format detail beyond the schema; 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 (List) and resource (Rent-a-Hatch vendors), and immediately disambiguates the resource by defining it as 'farms with rentalSettings'. It also names the sibling it is not (get_vendors_and_pos) so the agent can distinguish this from purchase-order vendors without opening either schema.

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 an explicit eligibility constraint ('SuperAdmin AI key only') and an explicit exclusion with a named alternative ('Not purchase-order vendors (use get_vendors_and_pos for those)'). When-to-use and when-not-to-use are both stated, leaving nothing to inference.

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