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

The 'WRITE:' prefix and the purchase caveat add real behavioral context beyond the idempotentHint annotation. However, it doesn't disclose consequences of archiving (reversibility, effect on live media/orders) or any permission requirements, which matters for a state-mutating endpoint with no destructiveHint.

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?

Extremely compact and front-loaded, with the write nature, allowed values, and caveat all in the opening words. The trailing API endpoint line is minor but harmless context.

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 two-parameter mutation with no output schema, the description covers the essential points: it's a write, the allowed states, and a key non-goal. Missing only side-effect/permission 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 schema documents sid but leaves status undescribed (50% coverage); the description compensates partially by naming the three valid states, but adds no meaning about what each state implies or how transitions behave.

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?

Starts with a specific verb (set) and resource (site status), enumerates the three target states, and explicitly scopes out purchasing. An agent can distinguish this from hdphotohub_update_site or hdphotohub_create_site 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?

The caveat 'This does not purchase the site' usefully narrows when this tool applies, but there is no guidance on choosing between this and hdphotohub_update_site, nor any stated prerequisites (e.g. site must already exist, permissions).

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