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

Annotations already declare readOnly, idempotent, closed-world and non-destructive behavior, so the safety profile is covered. The description adds that each entry carries licence and refresh metadata, which is useful return-content context but not rich behavioral disclosure (no note on how often sources refresh or size of the list).

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 sentence with no filler, and the resource being listed is front-loaded. It loses a point for the ambiguous 'license and refresh' clause, which could be tightened to state exactly what metadata is returned.

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?

With zero params, full annotation coverage and no output schema, the description's job is largely to say what comes back, and it does name the provenance and per-source metadata. A brief note on ordering or scope would make it fully self-sufficient, but nothing critical is missing.

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 there is nothing for the description to clarify; the baseline for a parameterless tool applies. No misleading parameter hints are given.

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?

States a specific verb ('List') and a specific resource (the provenance of marriage licence office data), so an agent can distinguish it from data-oriented siblings like get_listing or get_stats. The phrasing is slightly garbled ('with the license and refresh of each source' is ambiguous), but the intent is readable.

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 indication of when to call this versus siblings such as get_listing, list_categories, or get_stats, and no prerequisites or exclusions stated. Usage is only inferable from the tool name.

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