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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is fully covered by structured data. The description adds only the raw endpoint path, with nothing about authentication, what fields the list contains, or what happens when the id is unknown — minimal value beyond the annotations.

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 very short fragments with no padding, and the resource identification is front-loaded. The telegraphic style is efficient but borders on under-specification rather than tight writing.

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 should indicate what a returned contact list looks like, and it says nothing. For a simple one-parameter read tool this is a modest gap, but the description leaves the return shape and field contents entirely unknown.

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 0%, so the description must carry the burden for the single list_id parameter. It does so only weakly: 'by id' and the {list_id} path fragment confirm the parameter identifies the list, but no format, range, or source for obtaining a valid id is given.

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?

The description states a specific resource and scope: a single contact list fetched by id, backed by the endpoint GET /lists/{list_id}. The singular 'One contact list by id' implicitly distinguishes it from the sibling vision6_list_lists, though it never names that sibling or uses an explicit verb like 'retrieve'.

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?

There is no guidance on when to use this tool versus vision6_list_lists or vision6_list_list_fields, and no mention of prerequisites or error cases (e.g. invalid id). The agent must infer the choice from the singular phrasing alone.

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