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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds the 'public, sale-ready' eligibility filter, which is real behavioral context, but says nothing about volume, pagination, ordering, or what 'sale-ready' excludes.

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?

One short, front-loaded sentence with no filler or repetition. It is arguably too terse: 'sale-ready' is unexplained domain jargon that a caller may not be able to interpret.

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?

An output schema exists, so return values need no explanation, annotations cover the safety profile, and there are no parameters to document. The only gap is the undefined 'sale-ready' qualifier and no hint of result size or pagination.

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 tool takes zero parameters, so per the rubric the baseline is 4. There are no per-parameter semantics for the description to add or omit.

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?

Names a specific verb+resource ('List ... services') and narrows scope with 'public, sale-ready Christian Faith and Theology'. It is distinguishable from faith_services_search (querying) and faith_service_detail (single item), though it never names those siblings explicitly.

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 'public, sale-ready' qualifier implies this is the unfiltered catalog listing rather than a query tool, which is implicit usage guidance. However, there is no explicit statement of when to use this versus faith_services_search, faith_services_preview-style tools, or faith_service_detail.

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