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

The readOnlyHint annotation already establishes the safety profile, so the description's burden is lighter. It adds the underlying endpoint (GET /benchmarks), which is mild context, but says nothing about default ordering, pagination requirements, or whether the full collection is ever returned at once — the traits an agent most needs beyond the annotation.

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 clauses, front-loaded with the purpose, with no filler. The trailing 'API: GET /benchmarks' is marginally useful rather than essential, which keeps it just below a 5.

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 five optional filter parameters, no required fields, and annotations covering the safety profile, the definition is adequate to invoke the tool. However, with no output schema there is nothing describing what a benchmark record contains or how paging terminates, so the agent is left to discover return shape empirically.

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% and every parameter carries its own description, including the since_id paging idiom and the show_inactive enum, so the schema does the heavy lifting. The description adds no parameter meaning at all beyond this, making a baseline 3 correct.

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 site's benchmarks') and defines the domain term with a parenthetical ('hour or activity goals'), which an agent could not infer otherwise. It does not explicitly distinguish itself from galaxydigital_get_benchmark or galaxydigital_list_benchmark_users, but the list-vs-get distinction in the name carries most of the weight.

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?

Usage is only implied: the agent can infer this is the collection-listing counterpart to get_benchmark. There is no explicit guidance on when to prefer this over list_benchmark_users or whether pagination is mandatory, so the agent must reason about the sibling set itself.

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