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

Annotations already establish read-only, idempotent, non-destructive behavior, and the description adds genuinely new context: MCP never starts checkout and payment never changes a verdict, which bounds what this tool can do. It also advertises that unsold items are enumerated, a useful behavioral trait beyond the annotations.

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?

"START HERE" is front-loaded and the pricing list is compact, with each clause carrying information. The telegraphic price fragments are slightly dense, but nothing is redundant.

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 details are not required in the description. Coverage of pricing, sold/unsold scope, and the no-checkout guarantee is sufficient for a zero-parameter read tool, with only the sibling routing left implicit.

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 no parameters, so the schema has nothing to document and the baseline of 4 applies. The description correctly adds no parameter detail because none 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 description concretely states it returns the exact sold catalogue, the scientific contract, and pricing tiers, and it explicitly notes it lists what is NOT sold. That is specific content an agent can identify, though it stops short of naming siblings like get_pine_converter_contract or describe_survival_audit as distinct alternatives.

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 sequencing instruction that tells the agent to call this before other catalogue-related tools. It does not spell out exclusions or name a sibling to use instead for narrower questions, so it falls short of full when/when-not guidance.

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