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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint=false and destructiveHint=false, so the safety profile is fully covered by structured data. The description adds the useful notion that the payload includes limitations, not just evidence, but says nothing about provenance, freshness, or the shape of that evidence.

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 tight sentence with no filler, front-loading the verb and the payoff ('validation evidence and limitations'). Every word earns its place.

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-value description is not required, and the lone input parameter is covered. The remaining gap is routing: nothing tells the agent how this differs from faith_service_detail or when evidence retrieval is the right call.

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 100% and the single service_id parameter is fully documented with a pattern, so the schema does the heavy lifting. The description only reinforces that the ID refers to one public Christian Faith service; it adds no syntax or format information beyond the schema.

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?

Clear verb ('Get') plus a specific resource ('validation evidence and limitations for one public Christian Faith service'), which distinguishes it from siblings like faith_service_detail and faith_service_page that presumably return service content rather than validation metadata. It stops short of making that contrast explicit, so an agent must infer it from the name.

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?

No when-to-use or when-not-to-use guidance. With ten sibling faith_* tools, including faith_service_detail, an agent is given no cue as to when evidence/limitations retrieval is warranted versus fetching the service record itself. Usage is only implied by the resource name.

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