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

Beyond the annotations, which only cover the readOnly, openWorld, and destructive profile, the description discloses the cost (2 badges), the 30-day expiry, and the public visibility of the digital human on the map. These are the exact consequences an agent needs before a write.

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?

The description is one dense paragraph that leads with purpose and cost, then covers location rules and avatar behavior. Every sentence conveys actionable information, though the mixed topics make it slightly harder to scan than a bulleted form.

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?

No output schema exists, and the description does not say what comes back, such as the new digital human's ID, for later use with get_digital_human. Otherwise, the cost, expiry, visibility, location, and avatar behavior are covered for a 3-parameter write tool.

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%, so the baseline is 3. The description still adds meaning: pass a place name, never coordinates, and confirm the name and persona with the user first. The location fallback is already documented in the schema, so the added value is modest.

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 verb and resource: create a PowPow digital human, which it clarifies is a conversational AI character. This clearly distinguishes it from siblings such as get_digital_human, delete_digital_human, and my_digital_humans.

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 a real precondition: confirm the name and persona with the user before creating. It does not explicitly route to siblings, such as using geocode_place for locations, and it states no exclusions. Still, because creation is inherently distinct from read and delete siblings, the guidance is clear rather than merely implied.

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