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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, so the safety profile is covered. The description adds real value beyond them by disclosing the response content (price or 'priced per case', refund terms, who decides) and the existence of a free checker to run first, though it says nothing about rate limits or freshness of pricing.

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?

One dense sentence that front-loads the scope ('beyond single placements') before the parenthetical service list and the optional filter. The long inline enumeration of eight service types is slightly heavy, but each clause carries information the agent needs.

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?

With no output schema, the description must frame returns, and it does by naming price, refund terms, decision-maker, and the prerequisite checker. For a single-parameter read-only catalogue tool this is close to sufficient, with only the placement-vs-service boundary 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?

Schema description coverage is 100% with a single enum-constrained optional parameter already documented as 'Only services in this category.' The description's 'Optional category filter' merely restates the schema, so the baseline 3 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?

States a specific verb and resource (list services with prices) and scopes it precisely as 'every Essentras service beyond single placements', which implicitly separates it from quote_placements and quote_service. The enumerated service types and the promised fields (USD price or 'priced per case', refund terms, who decides) make the output contract visible without opening anything.

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 'free checker to run first' line routes the agent toward the check_* siblings as a prerequisite step, and 'beyond single placements' implies single placements belong to the quote tools. There is no explicit when-not or a direct naming of quote_service/quote_placements as alternatives, so it stops short of a full 5.

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