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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so safety is covered. The description adds the ordering guarantee ('newest first') and cross-list scope, which is useful, but says nothing about return format, default page size, or how the cursor paginates.

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 sentences, front-loaded with the core action and scope, with the sibling-exclusion clause last. 'Matching Saved picks in the app' is slightly redundant but earns its place as a UI anchor.

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 zero-required-parameter, read-only listing tool with no output schema, the description covers purpose, scope, ordering and sibling boundaries adequately. Only the shape of returned pick entries is left implicit.

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 67%, with list and cursor documented but limit left bare. The description contributes no parameter meaning at all, so it neither compensates for the undocumented limit nor adds anything beyond the schema baseline.

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 ('read back your saved picks across every list') plus ordering ('newest first') and explicitly names the siblings it is not (saved_lists, my_library). An agent can distinguish it from those tools without opening any 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?

It clearly routes the agent away from saved_lists and my_library, implying when this tool applies, but never states an explicit condition for choosing it over those siblings (e.g. 'use this to see individual items; use saved_lists for list metadata').

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