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

readOnlyHint=true already declares this is a safe read, so the description only needs to add context. It contributes the underlying endpoint (GET /qualifications/{id}/users), but says nothing about pagination, result size, or what happens when the qualification has no holders.

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?

Two short sentences with the purpose front-loaded and the endpoint as a secondary detail. No filler, though the API line is redundant for most agent decisions.

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?

For a one-parameter read-only list tool with full schema coverage and annotations declaring safety, the description plus structured fields are sufficient to call it correctly. The only gap is return/pagination behavior, which is modest given no output schema exists.

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 coverage is 100% with a single required qualification_id that is already documented and pattern-constrained. The description adds no syntax or format detail beyond the schema, so the baseline of 3 applies.

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 and resource ('List the users who hold one qualification'), which is distinguishable from galaxydigital_list_users (all users) and galaxydigital_list_qualifications (the qualifications themselves). It never names a sibling explicitly, so differentiation is inferred rather than stated.

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 phrase 'who hold one qualification' implies the use case (reverse lookup from qualification to members), but there is no explicit when-to-use guidance, no prerequisites, and no named alternative such as list_users or list_qualification_users.

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