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

The annotations already indicate a read-only, idempotent, open-world operation. The description adds meaningful behavioral context by explaining that the result shape depends on whether a live sensor observation is current or only a catalog entry exists, and it explicitly mentions the `dataType` field distinguishing LIVE from CATALOG.

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 compact and front-loaded: the first clause states the core purpose, followed by a concise explanation of the conditional response and the key dataType field. No sentences are wasted, and the structure is easy to parse.

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 no-parameter tool with no output schema, the description gives enough information to understand the general response shape, including plausible fields such as capacity, address, and tariff. It could be more explicit about what happens when no sensor observation and no catalog entry exist, but the core calling context is adequately covered.

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, so the baseline is 4. The description does not need to explain input semantics and adds relevant context about the output's dataType indicator, which is useful even though it is not an input parameter.

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 clearly states that the tool returns the status of public parking in Alicante, including free spaces under live sensor observation and catalog details when only catalog data exists. It is specific about the resource and scope, though it uses a noun phrase rather than a strong imperative verb and does not explicitly differentiate itself from sibling tools.

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 intended use case is implied through the domain-specific content about Alicante parking availability, so an agent can infer when to use it. However, there is no explicit guidance about when not to use this tool or what alternative to choose, leaving usage selection to inference.

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