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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so the safety profile is covered. The description adds nothing beyond the annotations: it doesn't say what a result looks like, what happens with an invalid or nonexistent parking_id, or how availability is determined (dates? time window?).

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?

One front-loaded sentence with no waste. It is arguably too terse for the ambiguity it leaves, but it is not padded or disorganized.

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 trivial one-parameter read tool this is close to sufficient, but with no output schema the description should say what the check returns (boolean vs. detail object) and how an unknown ID is handled. Those gaps keep it at minimum viable.

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?

Schema coverage is 100% with the single parking_id fully documented. The description adds no semantics beyond the schema (e.g., whether the ID must exist or how to obtain it), so baseline 3 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?

Names a specific verb ('check') and resource ('parking space availability'), so the purpose is unambiguous. However, it does not distinguish itself from the sibling 'list_available_parkings', which an agent could easily confuse with this single-space check.

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?

No guidance on when to use this versus list_available_parkings (bulk availability) or get_parking_details. The usage context is only implied by the word 'specific'.

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