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

Annotations already declare idempotentHint=true and destructiveHint=false, so the description's job is lighter. The description adds context that the profile belongs to the authenticated creator and lists which fields are affected, but it does not disclose details like whether partial updates are supported or what the response contains.

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, compact sentence leads with the action and resource, with the field list in parentheses. There is no redundant wording or filler.

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 update tool with four well-described schema parameters and non-destructive, idempotent annotations, the description is adequate. It does not explain return values or side effects, but the absence of an output schema and the tool's simplicity reduce the need for that detail.

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 input schema has 100% description coverage, so the description does not need to reinvent parameter semantics. It mentions bio, avatar, and display_name, which aligns with the schema, but it omits the required handle parameter from its parenthetical, adding no semantic detail beyond what the schema already provides.

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 states a specific action ('Update') and a specific resource ('authenticated creator's profile') and enumerates the three mutable fields. This clearly distinguishes it from read-oriented siblings like get_profile and list_my_profiles.

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 description gives clear context: this tool is for updating the profile of the currently authenticated creator. It does not explicitly name alternatives or exclusions, but the sibling set contains no other update_profile tool, making the intended use reasonably unambiguous.

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