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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), and the description adds real value beyond them: events within 7 days carry a weatherForecast with condition and min/max temperature, and `agora` is resolved live per call rather than from a cached page. It does not discuss result freshness trade-offs or rate behavior, keeping it at 4.

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?

Front-loaded with the core action and returned fields, then usage and the weather-forecast detail. Mostly efficient, though the closing clause 'which no cached page can do' is mildly promotional rather than informative.

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?

There is no output schema, so the description must carry the return shape — it does by naming date, venue, price, URL, and the weatherForecast structure. With only three optional parameters and full schema coverage, this is nearly complete; a brief note on ordering or result count behavior would close the remaining gap.

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 the schema already documents limit, filter enum values, and upcoming_only in detail. The description restates the `filter` purpose and the live-resolution behavior of `agora`, which adds some intent but largely overlaps the enum descriptions — baseline 3 is appropriate.

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 and resource ('List upcoming events in this neighborhood') and enumerates the returned fields (date, venue, price, URL, plus weatherForecast), so an agent can distinguish it from ticket-oriented siblings like get_event_tickets or reserve_event_tickets without opening a 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?

Gives concrete usage context: pass `filter` to narrow by time or price, and `filter: "agora"` is framed around the specific question 'what can I go to right now'. It does not explicitly name sibling alternatives (get_event_tickets, rsvp_event) or state when not to use this tool, so it stops short of a 5.

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