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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds genuinely useful behavior: the response is JSON:API { data, links }, pagination flows through links.next/links.prev cursors, and the returned objects contain PII — none of which the annotations or schema convey.

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 tight sentences plus an endpoint reference; the resource definition is front-loaded and the PII caveat is placed with the return shape. Slightly dense with filter enumeration that duplicates the schema, but nothing is wasted.

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 usefully explains the JSON:API return shape and cursor pagination, and flags PII. It is complete enough for a read-only list tool, though it says nothing about auth requirements, rate limits, or default page size.

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 nine parameters are already documented, and the description merely enumerates the filter set. It adds only the mapping of page_after/page_before to the links.next/links.prev cursors, which the schema partly states already. 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 (identity-verification inquiries), and immediately glosses the domain term as "an end-user's KYC verification session" plus the underlying REST endpoint. An agent can distinguish it from the singular persona_get_inquiry and the other persona_list_* siblings without opening a 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?

Usage is implied by the name and the mention of optional filters, but there is no explicit when-to-use or when-not-to-use guidance — e.g. nothing says to prefer persona_get_inquiry when you already have an inquiry id, or that this is the discovery path for the other persona_get_* tools.

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