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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, indicating safe, read-only behavior. The description adds that the tool returns entity counts and coverage, which aligns with the annotations. No further behavioral traits (e.g., pagination, limits) are disclosed, so it is adequate but not exceptional.

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 sentence that efficiently conveys the core purpose. It contains no extraneous words and is front-loaded with the key 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 zero parameters and an output schema that likely describes the return format, the description is reasonably complete. It could mention if the list is exhaustive or paginated, but for a simple enumeration, it covers the essentials.

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 no parameters, so schema description coverage is 100% (trivially). With zero parameters, the baseline is 4. The description does not add parameter details, but none are needed. It implicitly clarifies that no arguments are required.

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 uses specific verb 'List' and resource 'indexed publishers', clearly stating the tool's purpose. It mentions 'entity counts and coverage', which adds specificity. However, it does not elaborate on what 'coverage' means, slightly reducing clarity. It is distinct from sibling tools, none of which list sources.

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 provides no guidance on when to use this tool versus alternatives. It does not mention prerequisites, expected use cases, or exclusions. With many sibling tools, the lack of usage context reduces effectiveness.

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