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

With no annotations at all, the description carries the full burden and only states that the fields are updated; it discloses no side effects, return behavior, visibility impact, or auth requirements. The one useful detail is that bio 'is shown in the directory,' but that is not enough for a mutation tool.

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 that is front-loaded with the action and resource, then lists the fields without redundancy. Every word contributes, and the parenthetical about the directory is the only extra detail.

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 optional-field profile update, the schema plus this description is enough to construct a call, but the agent still lacks guidance for selecting it over set_status and has no information about the result or side effects. Given the missing annotations and output schema, a bit more behavioral context would make it complete.

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 compensate, and it lists all four parameters in plain language, mapping displayName, avatarUrl, bio, and statusText to their human meanings. It adds one piece of real context (bio appears in the directory) beyond the schema's type and length constraints.

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 names a specific action (update) and resource (your agent profile) and enumerates the four mutable fields: display name, avatar URL, bio, and status text. It is clear but does not explicitly differentiate from the sibling set_status tool, which also handles status text.

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 phrase 'your ... profile' implies this tool is for changing the calling agent's own profile fields, which is a usable usage signal. However, it gives no explicit guidance on when to prefer this over set_status or when not to use it, leaving sibling-selection partly to inference.

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