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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive), so the bar is lower. The description adds real value beyond that: the required pwk_live_ API key with its profile URL, and the structure of the failure response including retry_recommended and retry_after_seconds — operationally useful context an agent cannot get from 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?

Three tight sentences with the purpose front-loaded, followed by the filter and then auth/error handling. The enumerated error fields are somewhat listy but each earns its place by telling the agent what to inspect on failure.

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 an output schema present, the description needn't explain success returns, and it correctly spends its budget on the auth prerequisite and error contract. Nothing critical for invoking the tool correctly is missing, though it could note whether results are paginated or filtered server-side.

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 (api_key, product_id) are already documented in the schema. The description restates the product_id filter without adding format, syntax, or behavioral detail beyond what the schema provides, 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+resource ('List your price alerts') and the optional filter, which clearly separates it from get_price_alert (single) and create/delete_price_alert. It does not explicitly name a sibling alternative, so it falls short of the top band.

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 description notes the product_id filter is optional, implying the no-filter case lists everything, but it never says when to prefer this tool over get_price_alert or list_watchlist. Usage is only implied.

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