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

Annotations already declare destructiveHint=true, idempotentHint=true, and openWorldHint=true, but the description adds meaningful behavior beyond them: public list names/descriptions are checked before publication, and clearing is possible. It does not cover failure modes or response behavior, so it stops short of 5.

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?

Front-loaded and appropriately sized: every clause identifies a capability or constraint, with no filler. The single long sentence is dense but readable; bullet structure would help marginally but is not required.

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?

Given five parameters, a nested item object, no output schema, and rich annotations, the description covers the mutation surface, visibility semantics, and public-page check. Minor gaps such as name-collision behavior or return details keep it from 5.

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 100%, so the baseline is 3; the description adds real meaning by explaining the visibility enum distinction (link = anyone with the share link, public = also on the user's public page). Nested item fields such as title/item_id remain schema-only, keeping it at 4.

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?

Opens with a specific verb and resource ('Change a list') and enumerates exactly what can be edited: name, description, visibility, and one entry's note/position. This clearly scopes it apart from create_list, delete_list, and add_to_list, though it does not explicitly name those siblings.

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?

Gives a clear usage constraint: 'Only change visibility when the user asks.' It also implies the tool is for existing lists and existing entries, but does not name alternative tools for adding entries or editing notes elsewhere.

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