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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description still adds real behavioral detail beyond that: results are newest-first, the listing is account-scoped, and results are paged — all useful for planning calls and consuming output.

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?

A single front-loaded sentence with no waste; scope, content, ordering and pagination are packed into one clause each.

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?

An output schema exists, so return values need not be explained; the description covers scope, ordering and pagination adequately for a simple filtered-list tool. Only minor gaps remain, such as behavior at cursor exhaustion.

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 (kind, limit, cursor) are already documented in the schema. The description adds nothing parameter-specific beyond the word 'paged', so the 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 ('Lists') and resource ('photos saved in the account's TASVR library'), and narrows scope to person avatars and object references. It is distinguishable from list_presets and search_presets by resource, though it never names a sibling 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?

Usage is implied by the phrase 'saved in the account's TASVR library', which contrasts with uploads and saves, but there is no explicit when-to-use or when-not-to-use guidance relative to siblings like save_reference_to_library or isolate_reference_item.

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