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

Annotations already declare readOnlyHint, idempotentHint and openWorldHint=false, so the safety profile is covered. The description adds a genuinely useful behavioral consequence beyond that: cars on a parade/second-line route get towed, which is the kind of impact an agent should surface to a user. No return-shape detail, but that is minor here.

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 sentences with the scope and content types front-loaded, followed by concrete usage examples. Everything earns its place; only slightly verbose in the event-type enumeration.

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 read-only, single-parameter list tool with no output schema, the description covers purpose, scope window, content types and usage triggers adequately. Nothing critical to correct invocation is missing.

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 a single well-documented 'days' parameter, so the schema already carries the meaning. The description's 'next 1 to 7 days' echoes the schema's range but adds no format or edge-case guidance beyond it, so the baseline of 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?

States a specific verb (List) and resource (events/closures affecting parking) and enumerates the concrete content types it returns. It is readily distinguishable in spirit from siblings like find_parking or check_parking, but it never explicitly says what it is NOT, so it stops short of full sibling differentiation.

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?

Provides clear usage triggers via example questions ('anything going on downtown tonight', 'will parking be bad this weekend'), which tell the agent when to reach for it. There is no explicit when-not guidance or named alternative among siblings, though.

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