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

There are no annotations, so the description must carry the full behavioral burden. It lists the data domains but does not explicitly state that this is a read-only retrieval, whether the pricing is account-scoped, whether it requires authentication, or what the response looks like.

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?

It is a single compact sentence with no wasted words. The structure is a bare noun phrase rather than a front-loaded action statement, but it remains extremely concise.

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 zero-parameter tool with no output schema, the description gives a useful outline of returned content. It is still incomplete because it does not clarify how pricing relates to plan caps in reattest_limits or whether the pricing is global or account-specific.

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 there are no parameter semantics for the description to clarify. The baseline score of 4 applies because no input documentation is needed.

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 phrase 'Exact prices, plan caps and the one-time trial rule' identifies the resource as pricing information and adds specific content categories. However, it is a noun fragment with no verb and does not explicitly state that it retrieves or returns pricing data, nor does it clearly distinguish itself from the overlapping sibling reattest_limits.

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 gives no guidance on when to use this tool versus reattest_limits or other siblings, no prerequisites, and no exclusions. A reader must infer usage entirely from the tool name and the listed data categories.

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