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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and openWorldHint=false, so the safety profile is covered. The description adds value beyond that by disclosing the return payload (guide title and link) and the result cap (up to 12), which annotations cannot express. It does not cover behavior when the city has no guides, a minor gap.

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 tight sentences: the scoping and use case come first, the return shape last. Every clause carries information — audience site, subject matter, contrast with weekly events, and result limit — with no filler.

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 no output schema, the description correctly compensates by naming the returned fields and the 12-item cap, and it pins the domain to US cities. Only an empty-result or error case is unaddressed, which is a small omission for a two-parameter read tool whose annotations are already rich.

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% and both parameters (city, state) are documented in the schema with format hints, so the baseline is 3. The description only reiterates that the city is a US city and adds no new syntax or constraint detail beyond what the schema already provides.

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?

Specific verb+resource (list the "Best Around" guides) with explicit scope limited to a US city, plus a concrete enumeration of what the guides cover (parks, playgrounds, splash pads, museums, lights). The clause "rather than events on a given week" distinguishes it from find_kids_events without the agent needing to open either schema.

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?

Explicitly states the use case ("finding places to go in general") and the exclusion ("rather than events on a given week"), which routes the agent away from the event-listing sibling. It stops short of naming find_kids_events as the alternative for weekly events, so the routing is implied by category rather than by tool name.

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