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

Annotations already disclose destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the safety profile is covered elsewhere. The description adds the browser-approval gate, a meaningful behavioral/auth condition not present in the structured data, but it omits what state is overwritten and whether partial updates are possible.

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 with no filler; the precondition is tacked on at the end but the sentence remains compact and readable.

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 destructive, non-readOnly mutation with four undocumented parameters and 0% schema coverage, the description should explain confirmation_id and the overwrite semantics. An output schema exists so return values need not be described, but the approval mechanics and the fourth parameter are left unexplained.

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 must carry the parameter burden. It names three of four parameters but says nothing about the optional confirmation_id, which is clearly tied to the approval flow, and gives no format/length guidance for any field.

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 (Update) plus the resource (customer profile) and enumerates the mutated fields (name, phone, delivery address). No sibling tool touches profiles, so there is nothing to disambiguate against, keeping it just short of a 5.

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 clause 'after signed-in browser approval' communicates a precondition for use, which is genuine usage context. However, it does not say what to do if approval is absent, how approval is obtained, or how this relates to other write operations, so guidance remains implied rather than explicit.

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