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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds genuinely new behavioral context: the auth requirement (API key, free keys accepted) and the fact that each returned site carries install status and health, which tells the agent what the response contains even without an output schema.

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 sentences and no waste: the core action and payload are front-loaded, followed by the single prerequisite an agent needs before calling. Nothing could be removed without losing information.

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 zero-parameter, read-only listing tool with no output schema, the definition covers the action, contents of the result, and the auth requirement. Minor gaps remain around ordering, pagination, or behavior for accounts with no sites, but these are low-stakes for this tool's simplicity.

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 tool takes zero parameters, so there is nothing for the description to disambiguate and the schema is trivially complete. Baseline 4 applies.

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 gives a specific verb and resource ('Lists the user's Consentio sites') and states the scope of the payload (install status and health). It does not explicitly distinguish itself from overlapping siblings like get_site_health or check_install, so an agent must infer this is the bulk-listing variant rather than a single-site lookup.

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 only usage-relevant information is the prerequisite 'Requires an API key (Free keys work)', which tells the agent about auth and that free-tier keys suffice. There is no when/when-not guidance and no routing advice against check_install or get_site_health, so the choice among siblings is left to inference.

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