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

Annotations already declare destructiveHint=true and idempotentHint=true, so the safety profile is largely covered. The description adds useful behavior beyond that: removal is scoped to the signed-in person's favourites and returns `removed: false` when the item was not present.

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 short sentences, front-loaded with the action and target, followed by a compact return-value note. There is no redundant or padded content.

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 simple mutation tool with rich annotations and no output schema, the description covers the action, target resource, signed-in context, and one important return behavior. The main gap is parameter-level detail, which is partly mitigated by the schema's types, enum, and constraints.

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%, so the description needs to compensate. It only loosely maps to `kind` by saying a product or digital plan can be removed, and says nothing about the `id` parameter or the enum and length constraints already visible in the schema.

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: removes a product or digital plan from the signed-in person's favourites. This clearly separates it from list-oriented siblings such as remove_from_list, though it does not explicitly name an alternative.

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 purpose: use it to remove an item from favourites. However, there is no explicit when-to-use guidance, exclusion, prerequisite, or direct comparison to siblings like remove_from_list or save_favorite.

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