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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety and determinism profile is covered. The description adds genuine business context beyond that — pack-based pricing, the 15% retainer discount, VAT exclusion — but says nothing about whether the quote is binding, validity period, or minimum pack thresholds.

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?

Two tight sentences: the core deliverable and its unit first, then the supplementary retainer and VAT caveats. No filler, no repetition, and the most important information is front-loaded.

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?

There is no output schema, so the description carries the burden of explaining the return, and it does name the three components (fixed price, retainer price, VAT treatment). For a simple read-only pricing tool this is nearly sufficient; the main omission is any indication of whether the quote is binding or how long it holds.

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%, so both parameters are fully documented in the schema, including the 'pages after de-duplication' semantics and the GBP/EUR/CHF currency enum. The description only echoes the de-duplication caveat and adds nothing new about the currency parameter, so the baseline of 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?

The description names a specific deliverable (a fixed price for preparing a DSAR response) and its unit of measure (pack size in pages after de-duplication), plus what else comes back (retainer price at 15% off, VAT excluded). That is far more than a restatement of the title. It does not, however, distinguish itself from the sibling dsar_service_info, which an agent could plausibly confuse it with.

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?

Usage is strongly implied — call it with a de-duplicated page count to obtain pricing — but the description never states when to use this versus dsar_service_info or any other sibling, nor any prerequisite such as needing the page count first. Adequate implied guidance, no explicit routing.

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