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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world. The description adds that the tool takes no input and enumerates what it returns (products, option keys and choice ids, valid set quantities, ordering facts), which is useful beyond the annotations. It stops short of describing output format or caching, so not a 5.

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?

A single dense sentence plus a short exclusion sentence, with the call-to-action ('Use this first') front-loaded. Every clause carries distinguishing information—product scope, return contents, and exclusions—with no filler.

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-input, read-only discovery tool with no output schema, the description supplies the return contents, the sequencing relative to siblings, and the exclusion boundary. An agent has everything needed to select and call 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 and the schema is empty with additionalProperties false, so there is nothing to disambiguate; the description's 'Takes no input' correctly confirms this. Baseline of 4 applies for a parameter-free tool.

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 and resource (returns pricing capabilities: products, option keys/choice ids, set quantities, ordering facts) and scopes it to the exact product family (custom-printed index tab dividers), with parenthetical synonyms so the agent can match user phrasing. This is clearly distinguishable from quote_price and draft_order.

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?

Explicitly says 'Use this first, before quote_price or draft_order' when the user wants dividers priced or ordered, naming both siblings and the ordering relationship. It also states a negative boundary: not for blank/write-on dividers, labels, or binders.

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