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

With no annotations, the description carries the burden alone; it does disclose the useful negative scope (email/password/2FA cannot be changed here). However it never says whether this is a partial update (all four params are optional), whether omitted fields are left untouched, or what authorization/response behavior to expect for a mutation.

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 tight sentences, zero filler, with the writable-field list front-loaded and the caveat immediately after. Every clause carries information an agent would otherwise have to guess.

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 four-optional-param mutation with no output schema, the description covers which fields are changeable and which are not, but leaves the update semantics (partial vs. replace) and success behavior unstated. Adequate to invoke, incomplete to invoke confidently.

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 names all four parameters by exact key, which compensates for the missing schema docs at a basic level. It adds no meaning beyond the names — no format, no per-field rules, no indication of how partial omission is handled — so it lands at minimum-viable rather than strong.

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 concrete verb ('Change') plus the exact resource fields (first_name, last_name, company_name, position) and scopes them to the API key owner's own profile. This clearly separates it from adjacent tools like get_profile or set_profile_avatar, though it never names a sibling explicitly.

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 rather than stated, but the parenthetical '(Email, password and 2FA are UI-only.)' is a genuine exclusion that stops the agent from attempting unsupported fields. There is no explicit 'use this instead of X' routing, which is the missing piece.

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