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

Annotations already declare destructiveHint=true, idempotentHint=false and openWorldHint=false, so the safety profile is covered. The description adds genuine extra context: the allowedOrigins list is a full replacement rather than a merge, which explains why the operation is destructive. Auth requirements and partial-update semantics are still unstated.

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?

A single front-loaded sentence enumerating the four updatable fields with tight parenthetical clarifications; no filler. A bulleted or clause-per-field layout would be marginally easier to scan, but nothing here 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 five-parameter mutation tool, all parameters are documented and the annotations carry the destructive/idempotent profile. The description doesn't say what an unchanged field does or what the call returns, which is a minor gap since no output schema exists.

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%, so the baseline is 3, but the description goes beyond the schema: it explains that the name is customer-facing in the help center and widget, and that the slug appears in the default help center address. The replacement semantics for allowedOrigins is user-facing meaning the schema's terse 'Every origin the widget may load on' does not convey.

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 gives a specific verb ('Change') and resource ('a hosted product') and enumerates the exact mutable fields (name, site address, allowed origins, help center slug), which separates it from create_product, get_product and list_products. It does not name a sibling explicitly, so it falls just 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?

Usage is implied by the field enumeration — an agent can infer this is the tool for editing an existing product — but there is no stated when-to-use, no prerequisites (e.g. needing productId from list_products), and no exclusions versus near-neighbours like update_help_center_setting or update_brand.

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