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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds the notable behavioral fact that returned identity+revision is usable without expanding membership, and gestures at pagination ('exact continuation where needed'), but does not state cursor semantics, page limits, or what happens when the account has no lists.

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 no filler, and the return payload (IDs, revisions, continuation) is front-loaded. Slightly dense jargon ('exact continuation') is the only cost.

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?

There is no output schema, so the description does usefully enumerate the return fields and the practical use of identity+revision. However, for a 3-parameter paginated tool with two undocumented parameters, an agent still lacks enough to page correctly or understand request_id, so it is only minimally viable.

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 only 33%: limit is documented in the schema, but after_id and request_id carry no description anywhere. The phrase 'exact continuation where needed' vaguely gestures at the cursor but does not explain that it is supplied via after_id, nor what request_id is for (idempotency/deduplication). With low coverage the description should compensate and does not.

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+resource ('List this account's accessible saved Lists') and specifies what is returned (IDs, revisions, continuation). It implicitly separates itself from the sibling get_list by being the plural, account-scoped enumeration, though it never names the alternative explicitly.

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?

It hints at a downstream use case ('Activity research can use a returned List identity and revision without expanding its displayed membership'), which implies when the tool is useful, but it never states when to prefer this over get_list or search-style siblings, and gives no exclusions or prerequisites.

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