Get setup, capabilities and prices

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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so the safety profile is covered. The description adds genuinely new behavioral context: the tool is public and requires no account or authentication, and it performs no side effects. Minor gap: no note on response size or rate limits, though an output schema exists.

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?

Three tight sentences, front-loaded with the routing cue 'Start here' and the content enumeration. Every clause (onboarding paths, operations, limits, prices, payment steps) carries information an agent needs to decide to call it.

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-value detail is not required here. With annotations covering safety and the description covering auth requirements, scope, and no-side-effect behavior, an agent has everything needed to invoke it correctly.

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, which is the baseline-4 case per the rubric. The description correctly implies a no-argument call by framing it as a public discovery endpoint requiring no account.

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 ('discover') and enumerates the exact resource content: MCP/OAuth and guest REST onboarding, supported scoreboard operations, free limits, prices, and payment steps. 'Does not create anything' explicitly separates it from the create_* siblings, and 'Start here' positions it as the entry point ahead of get_account/get_scoreboard.

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?

'Start here' gives a clear first-call directive, and 'Does not create anything' rules out a class of misuse. It does not name specific alternatives for narrower needs (e.g., get_account for existing credentials), so it falls short of explicit when-not/alternative routing.

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