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

Annotations already declare the write/destructive/idempotent/open-world profile, so the bar is lower, and the description still adds real context: the value is publicly visible, it is content-screened like a bio, and clearing restores the taste archetype. It does not mention length limits, screening failure behavior, or the response shape.

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 tight sentence with the core action front-loaded and the clearing behavior appended. The parenthetical '(screened like a bio)' is slightly loose but conveys a useful constraint rather than padding.

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 one-parameter mutation with no output schema and annotations covering the safety profile, the description covers the important unknowns: public visibility, content screening, and clear semantics. Missing only edge details such as length limits or failure modes.

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 coverage is 100% and the parameter already documents 'Their line, or empty to clear', so baseline would be 3. The description adds meaning beyond the schema by explaining what clearing actually does — the taste archetype reappears in that slot — which the schema does not say.

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 specific verb and resource — setting the user's own short line displayed beside their handle on their public page — and clarifies the scope ('their own', 'public page') that separates it from page-styling siblings like style_page or set_page_sections. An agent can identify the operation without opening the schema.

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: the agent can infer this is the tool for writing the headline and that an empty string clears it. There is no explicit when-to-use versus alternatives, nor any prerequisite or eligibility guidance (e.g., whether a profile must exist first).

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