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

Annotations already declare readOnly=true, idempotent=true, destructive=false, so safety is covered. The description's added value is enumerating the returned fields, which is useful given there is no output schema, but it says nothing about pagination, filtering on the returned statuses, or auth requirements. Modest incremental value over 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?

A single economical fragment with the resource front-loaded and zero filler. It is not padded, though its brevity reflects under-specification rather than disciplined concision.

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 simple read-only, single-parameter list tool with no output schema, the field enumeration partially substitutes for a return-value spec. Still missing are usage context, the source of client_id, and any note on how the listed 'supported change types' relate to the sibling change tools.

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% and the description never mentions client_id or its format/source. The possessive 'The client's' only weakly implies the client_id parameter. With a low-coverage schema, the description fails to compensate for the missing parameter documentation.

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 fragment 'The client's ad accounts' names the resource and the returned fields (platform, currency, connection status, supported change types), which distinguishes it loosely from siblings like list_campaigns and list_clients. However, it is a noun phrase rather than a verb+resource statement, so it never explicitly says the tool retrieves/lists accounts. Purpose is inferable but not stated outright.

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 when-to-use guidance, no prerequisite (e.g. that client_id must come from list_clients), and no mention of alternatives despite many sibling list_* and *_ads tools. The agent must guess the calling context entirely.

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