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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and closed-world, so safety is covered. The description adds nothing beyond that — no note on pagination behavior, result ordering, or how the availability defaults interact. For an annotated tool this is a thin contribution.

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?

It is a single, front-loaded sentence with no filler, but the terseness reflects under-specification rather than efficient communication. Nothing in it is wasted, but little is earned either.

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 five parameters, a default that filters to available-only, and no output schema, the description should explain what comes back and how the availability flags combine. It covers none of this, so an agent cannot predict result contents or resolve the conflicting availability options from the definition alone.

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 description coverage is 100%, so all five parameters are self-documenting and the baseline is 3. The description adds no extra meaning, and notably does not clarify the interaction between available_only (default true) and include_unavailable, which is a genuine ambiguity the schema alone leaves open.

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 a verb and resource ("Search for parking spaces") plus a scope ("by area"), so the basic action is clear. But it does nothing to distinguish this from siblings such as search_by_location, search_by_price, or list_available_parkings, leaving the agent to guess which search variant applies.

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 statement of when to use this tool versus the many sibling search/list tools, and no exclusions or prerequisites. The only implicit guidance is that an area_slug is required, which comes from the schema rather than the description.

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