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

The description adds real behavioral context beyond the annotations: the call is free and produces no product result, which tells the agent it can be used cheaply for probing. Annotations (readOnlyHint=false, openWorldHint=false, destructiveHint=false) cover the safety profile, though readOnlyHint=false sits in mild tension with a 'Return ... state' framing; this is most likely a conservative default rather than a claimed mutation, so it is not scored as a contradiction.

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 short sentences, front-loaded with the purpose and followed by the cost/effect caveat; nothing is padded. The only cost is that the second clause ('no product result') is cryptic without further 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?

With an output schema present, return values need no explanation, and zero parameters keep the calling surface simple. What is missing is sibling routing — an agent cannot tell from this description why it would call aios_status instead of check_guidance_status or preflight_request.

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 baseline of 4 applies. Schema coverage is 100% and the empty object schema is self-explanatory.

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 verb+resource ('Return public AIOS discovery state'), so the agent knows it retrieves some status/discovery payload. However, 'AIOS discovery state' is internal jargon and does not distinguish this tool from siblings such as check_guidance_status, preflight_request, or list_pricing, leaving the agent to guess which status tool it needs.

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?

'Free; no product result' hints at the cost model and that this is a lightweight probe rather than a work-producing call, which is genuinely useful. But it never states when to choose this over check_guidance_status or preflight_request, and offers no exclusions or prerequisites.

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