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

Since no annotations are provided, the description carries the burden. It clearly states that the tool returns retirement details, not live markets, which is a behavioral disclosure. However, it does not explain what 'retirement details' include (e.g., closure date, reasons, refunds?), but the core behavior of returning non-live data is explicit.

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 very brief but effective. It front-loads the retirement status and the closure date interactively. However, it could be slightly clearer by stating that it returns retirement details and not live data in one sentence. But overall it is concise without fluff.

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?

The tool is simple (0 params, no output schema, no siblings that are clearly related). It conveys the core fact needed: markets are closed AMAund, but details about what exactly the tool returns (retirement details) are not elaborated. For an agent, it may be enough, but it could state the kind of information contained (e.g., closure date, refund process).

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 has zero parameters)Skip, so the schema covers everything (100% coverage). The description does not need to explain parameter semantics since there are none. Thus a baseline of 4 is appropriate because there is no parameter burden.

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 that the tool returns retirement details and that the markets are closedable, but the actual function's purpose is clear enough: it provides info about the retirement. However, it does not name a specific verb like 'get' or 'retrieve', so it's slightly vague. It distinguishes from siblings implicitly by saying it is retired, but not as strongly as a clear verb-resource pairing.

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?

There is no guidance on when to use this tool. It says that X1 Prophet markets are closed, but does not mention any alternatives or conditions under which an agent should call this vs a sibling. For instance, it could say 'Use to check retirement details; no live data is available.' There's no alternate tool referenced, so the usage context is incomplete.

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