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

Annotations already declare readOnly, idempotent, closed-world, so safety is covered; the description adds that the response includes vendor and pricing-service totals, which is useful since there is no output schema. It omits relevant behavioral context: the PRO-key gating for vendor-level data and whether results are truncated or paginated.

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 sentences, no filler, with the resource definition front-loaded and filtering last. The first sentence is dense with nested parentheticals that slightly slow parsing, but nothing is wasted.

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 read-only, fully documented four-parameter listing tool with no output schema, the description is mostly sufficient: it explains the return content and filtering. It falls short on the PRO-key/free-tier distinction and on steering the agent away from the similar get_vendor_catalog or search_models tools.

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 coverage is 100%, with region and channel examples and the DEV/CLD/PLT/NCL codes documented in the schema itself. The description restates the three filter dimensions but adds no example values or matching semantics (exact vs partial matching, multi-value support) beyond what the schema provides.

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 states a concrete resource (every pricing service in the Attic Standard fleet) and enumerates the attributes returned (vendor, channel, country, region, currency, pricing page), so an agent knows exactly what listing it gets. It does not differentiate from the closest sibling, get_vendor_catalog, leaving ambiguity about which listing tool to pick.

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?

"Filter by channel, region or country" implies the calling pattern, and the optional-parameter framing aligns with the zero-required-parameter schema. However, there is no statement of when to prefer this over get_vendor_catalog or compare_prices, and no mention of the free-tier vs PRO-key condition that governs vendor/SKU-level data.

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