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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so safety is covered. The description adds one genuinely useful behavioral fact: third-party documents are not hosted but linked at their source. It says nothing about result size, ordering, or pagination.

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 with the resource and both scoping modes front-loaded. The type enumeration largely duplicates the enum in the schema, which costs a little space for little gain.

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 two-optional-parameter list tool with no output schema, the description covers what the tool returns at a high level (document links, third-party at source) but leaves the no-argument 'list everything' behavior and result shape unstated.

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 coverage is 50% (only 'series' is documented), so the description must compensate. It conveys the meaningful semantic that the two filters are optional and combinable ('across the site' = type only), which is real added value, but it omits the 'other' enum value and never states what happens when both parameters are omitted.

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?

Specific verb ('List') and resource ('documents') with the publisher named and the two scoping modes spelled out ('for a series, or of one type across the site'). It never names a sibling tool, so differentiation from search/find_series is left implicit.

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?

The 'for a series, or of one type' phrasing implies the two ways to call it, but there is no explicit when-to-use guidance, no exclusions, and no pointer to alternatives (e.g., use search for keyword queries, find_series to obtain the series id).

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