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

readOnlyHint=true already tells the agent this is a safe read, so the bar is lower. The description adds that results are paginated and references the underlying endpoint, but says nothing about default page size, max results, ordering of records, or authentication/scope needs.

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 compact clauses, front-loaded with the core action and resource. The endpoint fragment ("Vital API: GET /v3/orders") is marginal but cheap; nothing is padded.

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 7-parameter, all-optional read-only list tool with full schema coverage and no output schema, the description covers what is needed to call it correctly. Missing only finer points like pagination defaults and result ordering, which the schema does not carry either.

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 every one of the 7 parameters is already documented in the schema. The description adds only the generalization "with filters, paginated" and no per-parameter meaning beyond that, so 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?

States a specific verb and resource ("List lab-test orders") plus scope modifiers (filters, paginated), which clearly distinguishes it from the singular siblings vital_get_order and vital_get_order_results. It stops short of explicitly naming which sibling to use instead when a single order is wanted.

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?

No when-to-use guidance beyond the implication of "filters". It never says to prefer this over vital_get_order, nor does it describe when a filtered listing is appropriate versus search. No exclusions or prerequisites are given.

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