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

No annotations are provided, so the description carries the full burden for a mutation tool. It does not mention authentication requirements, whether invitations are sent, whether the event is created on a primary or specific calendar, or what happens on failure.

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 short sentence with no wasted clauses and is trivially front-loaded. The brevity is not the problem; the boilerplate framing contributes nothing beyond 'add event' and the under-specification is what costs it points.

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 tool that creates calendar events, the description omits essentials like time, title, attendees, and which calendar, and notes that no parameters are required (0 required). With no annotations and no output schema, the description leaves the agent without enough context to invoke this correctly.

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 there is a single parameter whose meaning ('Task-specific details from the objective') is already documented in the schema. The description adds no syntax, format, or content guidance beyond that, so the baseline 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?

The phrase 'add event' gives a verb+resource for Google Calendar, so the agent can tell it apart from calendar__delete_event and calendar__update_event. However, it is wrapped in generic boilerplate ('Run Google calendar action') and gives no scope detail such as which calendar or what an event consists of.

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 guidance on when to choose this tool over calendar__update_event, calendar__delete_event, or the calendar__converse sibling. The only cue is the word 'add' in the name, which the description merely restates.

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