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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and closed-world, so the safety profile is fully covered. The description adds no behavioral context of its own — no pagination, no scope, no note about whether option sets are included inline — and the approval sentence is generic boilerplate that risks suggesting a read needs approval.

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 first sentence is efficient and front-loaded. The second sentence about MCP approval configuration and business workflow approvals does not earn its place on a read-only, zero-parameter listing tool and dilutes the payload.

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 shape need not be described, and annotations cover safety. What is missing is scope disambiguation from the custom-field value siblings and any hint about result size or organization-wide vs location-level applicability.

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 disambiguate; per the baseline this scores 4. The empty schema with additionalProperties=false confirms the description need not explain inputs.

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 first sentence states a specific verb and resource: reading the organization's location custom field definitions and option sets. It is clear what data comes back, but it never distinguishes itself from the value-level siblings get_site_custom_fields / set_site_custom_field or from the create/update/delete_custom_field group.

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?

There is no statement of when to call this versus get_site_custom_fields (read values applied to a site) or the CRUD siblings. The only guidance offered concerns approvals, which is not a selection criterion for a read-only listing tool.

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