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

Annotations declare readOnlyHint=false and destructiveHint=false, and the description adds meaningful context: the tool preserves existing groups, may save product setup, and returns readiness only. It could be more explicit about the side effect of saving setup, but it communicates the key non-destructive and persistence behavior beyond what annotations provide.

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 pack the trigger condition, preservation guarantee, side-effect, return type, and routing guidance. Slightly dense phrasing ('May save product setup') rather than crisp, but there is no wasted text.

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-argument setup tool with an output schema, the description covers the precondition ('from stored insights', 'when none exist'), the non-destructive guarantee ('preserve existing groups'), the result ('readiness only'), and explicitly routes the adjacent concern (status checks) to setup_get_status. Nothing an agent needs is missing.

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?

Tool has zero parameters, so the baseline of 4 applies. The description reinforces this by stating 'No arguments' and thus fully covers the parameter dimension despite the empty schema.

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 uses a specific verb ('prepare') with a clear resource ('initial product groups from stored insights') and a precise condition ('when the workspace has none'). It distinguishes this setup action from sibling tools like setup_get_status and setup_readiness_check by stating its scope and trigger.

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?

Explicitly states the condition under which to use the tool ('when the workspace has none') and names the alternative (setup_get_status) with the routing condition ('for status checks'), plus notes the separate operator path for operator_diagnosis. Clear when-use and when-not-to-use guidance.

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