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

With no annotations provided, the description carries full responsibility for behavioral disclosure. It only states the action 'Create a Google Calendar event' without mentioning side effects, required permissions, calendar selection, or post-creation behavior. This leaves the agent unaware of critical behavioral details.

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?

The description is a single sentence with no extra words, making it concise. However, it is under-specified; it lacks essential details about the parameter and usage, so it is not appropriately sized for a tool that likely depends on a natural language instruction. It is lean but at the expense of informativeness.

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?

Given the absence of annotations and output schema, and a single undocumented parameter, the description is far from complete. It does not explain what the instruction should include, how the event is created, or what the agent should expect in return. This is inadequate for a tool with a flexible input parameter, leaving too much ambiguity.

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?

The schema has a single 'instruction' parameter with no description, and schema description coverage is 0%. The tool description does not explain what 'instruction' should contain or how it is processed, so the agent is left guessing about the required input format. The description fails to compensate for the lack of schema detail.

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 description clearly states the tool creates a Google Calendar event with a specific verb and resource, distinguishing it from Outlook event creation. However, it doesn't explicitly differentiate from create_recurring_event or other calendar-related tools, so it's not fully distinguished among siblings.

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?

The description offers no guidance on when to use this tool versus alternatives like create_recurring_event, create_outlook_event, or update_calendar_event. It does not mention any exclusions, prerequisites, or recommended contexts, so the agent has no basis for selecting this tool over others.

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