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

The description goes beyond the annotations by explicitly stating 'Public, no key needed,' clarifying the authentication requirement. Combined with readOnlyHint=true, it makes the read-only, open nature of the operation fully transparent. No side effects are mentioned, and none are implied.

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 description is a single, compact sentence that lists the key output components without any redundant words. It is well-structured and immediately conveys the tool's purpose.

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?

Even without an output schema, the description comprehensively tells the agent what to expect: rate benchmarks, verdict rules, and live combined reach. It also notes the public nature of the data, giving enough context for correct invocation and interpretation.

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 has zero parameters, so the input schema is fully covered by an empty object. The description adds no parameter meaning because none is needed; the operation is a simple getter with no 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 description clearly identifies the resource (market benchmarks) and the specific data returned (rate benchmarks, offer verdict rules, live combined reach). It distinguishes itself from sibling tools like get_creator and list_creators, which focus on individual creators or listings, not market-level data.

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 description implies when to use the tool (when market-rate benchmarks or offer verdict rules are needed) and explicitly notes 'Public, no key needed' for authentication. While it does not name alternative tools, the unique purpose makes the usage context clear, though an explicit 'use this when' would have been stronger.

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