list_accessible_customers

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

No annotations are provided. The description correctly indicates a read operation ('list'), but does not disclose potential behaviors such as pagination, rate limits, or error cases. For a parameterless tool, the transparency is acceptable but minimal.

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?

The description is a single concise sentence with no unnecessary words. It is front-loaded with the action and resource.

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 the tool has no parameters and no output schema, the description is nearly complete. It could mention the return type (a list), but the purpose is clear. The simplicity justifies a slight deduction.

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?

The input schema has zero parameters with 100% coverage. The description adds no parameter details, which is appropriate since there are none. Baseline 4 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?

The description explicitly states the action ('List'), the resource ('Google Ads customer ids'), and the context ('the authenticated user can access'). It clearly distinguishes from sibling tools 'search' and 'describe_resource'.

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?

The description implies when to use this tool (to get a list of accessible customers), but provides no explicit guidance on when not to use it or alternatives. Given the simplicity and distinct sibling names, the implied usage is adequate.

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