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

The description discloses the dual read/update behavior, which adds context beyond the annotations' readOnlyHint=false. However, it does not state that an empty call likely performs the read while supplying parameters performs the update, nor does it mention any side effects or authorization nuances. No contradiction with annotations is 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?

A single sentence with no filler, front-loading the read action and then bundling the updateable fields. Every word contributes to the meaning, and the enum clarification is embedded naturally.

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?

The description is adequate for a simple profile tool but leaves gaps: it does not explicitly explain that calling with no parameters reads while calling with parameters updates, and with no output schema it does not describe what a successful read or update returns. These are material for an agent deciding how to invoke and interpret the tool.

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?

With 0% schema description coverage, the description carries the burden of explaining parameters, and it names all four: name, phone, language, and contact channel via 'where to send notifications (email or telegram).' It clarifies the enum values and the purpose of each field, though it omits formats like language codes or phone number syntax.

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 uses a specific verb and resource: 'Read the signed-in user's profile, or update name, phone, language or where to send notifications.' It clearly identifies the object (the current user's profile) and the two distinct actions. This sufficiently distinguishes it from siblings like my_bookings and logout.

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?

No explicit guidance is provided about when to use this tool versus alternatives. The phrase 'signed-in user's profile' implies it targets the current user, but there is no mention of alternatives, exclusions, or preferred context among the many sibling tools.

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