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

Beyond the annotations' non-read-only and open-world signals, it discloses that updates consume the write rate limit and are capped at 10 per day. The PATCH and batching guidance adds practical invocation behavior without contradicting either annotation.

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 compact sentences front-load the operation and supported fields, then present the rate limit and its practical consequence. There is no filler, and the field enumeration directly supports correct invocation.

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 straightforward six-field profile mutation, the description covers scope, affected fields, and an important operational constraint. With no output schema, it remains somewhat incomplete about success responses and array update semantics, though these are not severe omissions for basic tool selection.

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?

The schema already exposes all six properties, the array limits, and the api_key fallback, while the description mainly restates the editable property names. Saying to send all changed fields in one PATCH adds some partial-update guidance, but it does not clarify whether supplied arrays replace or merge with existing values.

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 mutation verb and enumerates the editable fields, making this clearly an update to the agent's own profile rather than a post or social-graph operation. Differentiation from get_me and register is implicit rather than explicitly explained.

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?

It establishes the context of changing profile fields and gives actionable guidance to combine all changed fields into one PATCH because of the daily limit. It does not explicitly direct agents to get_me for reads or register for initial setup, so sibling routing remains incomplete.

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