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

Annotations already declare destructiveHint=true and idempotentHint=true, yet the description adds genuinely new behavior: NOT_FOUND on a missing entry even after a prior successful removal, and the fact that a timeout leaves the mutation outcome unknown with a recommendation to inspect the watchlist before retrying. That is exactly the failure-mode context annotations cannot express.

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 short sentences, front-loaded with the action, then the error semantics, then the retry hazard. Nothing is redundant.

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?

An output schema exists, so return values need not be explained, and the annotation set covers the safety profile. The description rounds this out with failure and retry semantics, though it says nothing about permissions or whether a removed listing can simply be re-added.

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 0% and the description never mentions productListingId, so no meaning is added beyond the schema. However, there is only one required parameter and its format is fully pinned by a strict regex pattern, so the practical gap is small.

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 listing from your watchlist'), which cleanly distinguishes it from the add and patch watchlist siblings. An agent can identify the operation without opening the schema.

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 implied by the name and the removal verb, but there is no explicit guidance on when to prefer this over patchWatchlistProduct or when removal is appropriate versus merely updating. The guidance present is about error/retry handling rather than tool selection.

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