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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the agent knows this is a safe, closed-world read operation. The description adds no behavioral traits beyond that—no authentication, rate limits, or caching info. Since annotations carry the safety profile and the tool is parameterless, a 3 is appropriate as the description adds nothing but also contradicts nothing.

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 single sentence is front-loaded and efficient, listing the three key pricing areas. It avoids waste, though it is a fragment (no verb) and could be slightly more structured. It earns its place by summarizing the scope.

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?

Given no parameters, an output schema, and simple annotations, the description provides the necessary scope (what pricing information is returned). The output schema presumably details return values, so the description need not explain them. It is complete enough for an agent to invoke, though it lacks sibling differentiation.

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?

With zero parameters, the baseline is 4. The description does not need to explain parameters, and it correctly omits any. No penalty 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?

The description states a specific resource (Universal Agents pricing) and enumerates the sub-topics covered: paid pilot, cost to continue rollout, and licensing and support. It is a clear retrieval tool, though it doesn't explicitly differentiate itself from siblings like 'about_universal_agents' or 'answer_faq'. It implies pricing-specific content, which is clear enough to distinguish from a general FAQ, but not as sharply as naming the sibling.

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 explicit guidance on when to use this tool versus alternatives like 'about_universal_agents' or 'answer_faq'. A user might ask a general pricing question, and it's not stated whether this tool is the right one or if 'answer_faq' handles pricing. The description implies usage context (pricing queries) but leaves the agent to infer when this is preferable to siblings.

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