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

Annotations already flag destructive=true, idempotent=true and openWorld=true; the description goes further by spelling out partial-update semantics ('lines not passed stay as they are'), the empty-string clearing rule, the clear:true whole-box wipe, and the 60-character per-line cap. It stops short of noting reversibility or whether the date stamp is automatic, but that is a minor gap given the annotation coverage.

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 tight sentences with no filler; the resource is front-loaded and the update semantics follow immediately. Every clause conveys information an agent cannot get from the schema or annotations.

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 six-parameter mutation with no output schema, the definition covers field meaning, clearing behaviour, and length limits. Only an indication of what the call returns or confirms (and any permission requirement) is absent, which is a small gap at this complexity.

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 only 17% schema description coverage, the description carries the load and does so well: it names all five line parameters, explains the distinct meaning of an empty string versus clear:true, and adds the 60-character constraint that the schema lacks. It does not specify whether values are free text or must match a canonical item, leaving one ambiguity.

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 ('Set') and a precise resource ('lines of the user's "Currently" box beside their bio'), then enumerates the five line types in parentheses. The location cue ('beside their bio') distinguishes it from neighbouring setters such as set_headline or set_page_sections without needing to name them.

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 makes the intended operation clear but never says when to reach for this instead of a sibling, nor any precondition (e.g. profile must exist). Usage is implied by the resource being edited rather than stated.

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