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

No annotations are provided, so the description carries the full behavioral burden, yet it says nothing about timezone handling, default radius, pagination, sort order, or what a result contains. The only behavioral hint is that results mix events and places, which is a small disclosure for a 6-parameter, zero-required-parameter query tool.

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?

A single front-loaded sentence with no filler, which is structurally fine. However, for a 6-parameter tool with no annotations it is under-specified rather than truly concise, so the brevity costs more than it saves.

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 six optional parameters, no annotations, and no output schema, the description should explain timezone/location expectations, defaults, and result shape, and it explains none of them. An agent cannot determine what happens if tz or lat/lng are omitted, or how limit/offset behave.

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 baseline is 3. The lat/lng/radius_km descriptions do add format guidance ('Send a number, not a string'), but tz, limit, and offset are documented only by restating their own names, and the tool description adds no parameter meaning at all.

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 phrase 'Events and places happening today' names the resource and the temporal scope, so an agent knows it returns a mixed set of events and places. It never uses a clear verb and draws only an implicit line against siblings like get_events, get_weekend, and get_live_now, so differentiation is left to inference.

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 get_events, get_weekend, or get_live_now, and no prerequisites, defaults, or exclusions. 'Today' in the name is the only routing signal.

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