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

Annotations already declare destructiveHint=true and idempotentHint=true, so the description's added value is the auth requirement (pwk_live_ key with a URL for obtaining it) and the failure precondition. It doesn't describe reversibility or rate limits, but the destructive/idempotent profile is covered by annotations, so this is solid.

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, front-loaded with the action before the precondition and auth detail. The key-prefix format slightly duplicates the schema, but the URL for obtaining the key is genuinely additive and 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?

Covers purpose, precondition, auth requirement, and error-object shape, while an output schema exists to carry return values and annotations carry the safety profile. An agent has everything needed to invoke this correctly and interpret failure.

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 api_key and product_id are already documented in the schema. The description only restates the api_key format, adding nothing beyond the structured fields, 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 ('Remove a product from your account watchlist') and is easily distinguished from siblings like watch_product, track_product, and delete_price_alert. It also flags a key scope condition (fails with an active price alert) that shapes selection.

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?

Gives clear context for when the call succeeds and the precondition that blocks it ('Fails while an active price alert exists'), which implicitly routes the agent to delete the alert first. It never names the alternative tool explicitly, so the routing is inferred rather than stated.

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